iOS开发 - CoreData框架数据持久化

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[置顶] iOS开发 - CoreData框架数据持久化

分类：【IOS-CoreData框架】2015-07-17 09:34 108人阅读评论(0) 收藏举报

Core-Data数据持久化ios开发sqlite

目录(?)[+]

Core Data

Core Data是iOS5之后才出现的一个框架，它提供了对象-关系映射(ORM)的功能，即能够将OC对象转化成数据，保存在SQLite数据库文件中，也能够将保存在数据库中的数据还原成OC对象。在此数据操作期间，我们不需要编写任何SQL语句，这个有点类似于著名的Hibernate持久化框架，不过功能肯定是没有Hibernate强大的。

传统的数据库要把数据写到数据库，而且要写SQL语句 Core Data 就避免了写SQL语句的麻烦了

这里写图片描述

CoreData的使用步骤

1.创建模型文件相当于数据库
2.添加实体相当表
3.创建实体类相于模型类
4.生成上下文关联模型文件生成数据库
5.保存对象到数据库
6.从数据库获取对象
7.更新数据
8.删除数据

1.创建模型文件
所谓的创建模型就是间接生成数据库表
这里写图片描述

2.添加实体
这里写图片描述
3.创建实体类
以创建员工实体类为例

生成上下文件关联模型文件生成数据库

<code class="hljs objectivec has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"> NSManagedObjectContext  _context = [[NSManagedObjectContext alloc] init];    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 模型文件</span>    NSManagedObjectModel *model = [NSManagedObjectModel mergedModelFromBundles:<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">nil</span>];    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 持久化存储调度器</span>    NSPersistentStoreCoordinator *store = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:model];    <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSString</span> *doc = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">YES</span>) lastObject];    <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSLog</span>(@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"%@"</span>,doc);    <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSString</span> *sqlitePath = [doc stringByAppendingPathComponent:@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"company.sqlite"</span>];    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//数据存储的类型 数据库存储路径</span>    [store addPersistentStoreWithType:NSSQLiteStoreType configuration:<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">nil</span> URL:[<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSURL</span> fileURLWithPath:sqlitePath] options:<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">nil</span> error:<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">nil</span>];    _context<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.persistentStoreCoordinator</span> = store;</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li></ul>

保存对象到数据库

<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;">Employee *employee = [NSEntityDescription insertNewObjectForEntityForName:@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Employee"</span> inManagedObjectContext:_context]<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>    employee<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.name</span> = @<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"zhangsan"</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>    employee<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.age</span> = <span class="hljs-localvars" style="box-sizing: border-box;">@18</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>    employee<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.height</span> = <span class="hljs-localvars" style="box-sizing: border-box;">@1</span><span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">.89</span><span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span>    [_context save:nil]<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">;</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li></ul>

打开CoreData的SQL语句输出开关

<code class="hljs avrasm has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;">    <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1.</span>打开Product，点击EditScheme...    <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2.</span>点击Arguments，在ArgumentsPassed On Launch中添加<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>项    <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>> -<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">com</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.apple</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.CoreData</span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">.SQLDebug</span>    <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2</span>> <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li></ul>

CoreData实例

生成实体类

<code class="hljs objectivec has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#import <span class="hljs-title" style="box-sizing: border-box;"><Foundation/Foundation.h></span></span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#import <span class="hljs-title" style="box-sizing: border-box;"><CoreData/CoreData.h></span></span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">@interface</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">Employee</span> : <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">NSManagedObject</span></span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">@property</span> (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">nonatomic</span>, retain) <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSString</span> * name;<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">@property</span> (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">nonatomic</span>, retain) <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSNumber</span> * age;<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">@property</span> (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">nonatomic</span>, retain) <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSNumber</span> * height;<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">@end</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li></ul>

<code class="hljs css has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-id" style="box-sizing: border-box; color: rgb(155, 112, 63);">#import</span> "<span class="hljs-tag" style="color: rgb(0, 0, 0); box-sizing: border-box;">Employee</span><span class="hljs-class" style="box-sizing: border-box; color: rgb(155, 112, 63);">.h</span>"<span class="hljs-at_rule" style="box-sizing: border-box;">@<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">implementation</span> Employee@dynamic name</span>;<span class="hljs-at_rule" style="box-sizing: border-box;">@<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">dynamic</span> age</span>;<span class="hljs-at_rule" style="box-sizing: border-box;">@<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">dynamic</span> height</span>;<span class="hljs-at_rule" style="box-sizing: border-box;">@<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">end</span></span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li></ul>

这里写图片描述

import头文件框架

<code class="hljs objectivec has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#import <span class="hljs-title" style="box-sizing: border-box;">"ViewController.h"</span></span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#import <span class="hljs-title" style="box-sizing: border-box;"><CoreData/CoreData.h></span></span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#import <span class="hljs-title" style="box-sizing: border-box;">"Employee.h"</span></span><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">@interface</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">ViewController</span> ()</span><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">@property</span>(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">strong</span>,<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">nonatomic</span>)NSManagedObjectContext *context;<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">@end</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li></ul>

CoreData模糊查询

<code class="hljs objectivec has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-class" style="box-sizing: border-box;"><span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">@implementation</span> <span class="hljs-title" style="box-sizing: border-box; color: rgb(102, 0, 102);">ViewController</span></span><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#pragma mark 模糊查询</span>- (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">IBAction</span>)likeSearcher:(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">id</span>)sender {    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 查询</span>    NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Employee"</span>];    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 过滤</span>    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 1.查询以wang开头员工</span>    NSPredicate *pre = [NSPredicate predicateWithFormat:@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"name BEGINSWITH %@"</span>,@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"wang"</span>];    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 2.以si 结尾</span>    NSPredicate *pre = [NSPredicate predicateWithFormat:@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"name ENDSWITH %@"</span>,@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"si"</span>];    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 3.名字包含 g</span>    NSPredicate *pre = [NSPredicate predicateWithFormat:@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"name CONTAINS %@"</span>,@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"g"</span>];    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 4.like 以si结尾</span>    NSPredicate *pre = [NSPredicate predicateWithFormat:@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"name like %@"</span>,@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"li*"</span>];    request<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.predicate</span> = pre;    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//读取信息</span>    <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSError</span> *error = <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">nil</span>;    <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSArray</span> *emps = [<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.context</span> executeFetchRequest:request error:&error];    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (!error) {        <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSLog</span>(@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"emps: %@"</span>,emps);        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> (Employee *emp in emps) {            <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSLog</span>(@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"%@ %@ %@"</span>,emp<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.name</span>,emp<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.age</span>,emp<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.height</span>);        }    }<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span>{        <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSLog</span>(@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"%@"</span>,error);    }}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li></ul>

CoreData 更新数据

<code class="hljs objectivec has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#pragma mark 更新员工信息</span>- (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">IBAction</span>)updateEmployee:(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">id</span>)sender {    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 把wangwu的身高更改成 1.7</span>    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 1.查找wangwu</span>    <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSArray</span> *emps = [<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span> findEmployeeWithName:@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"wangwu"</span>];    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 2.更新身高</span>    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (emps<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.count</span> == <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1</span>) {        Employee *emp = emps[<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>];        emp<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.height</span> = @<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1.7</span>;    }    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 3.同步（保存）到数据</span>    [<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.context</span> save:<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">nil</span>];}-(<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSArray</span> *)findEmployeeWithName:(<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSString</span> *)name{    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 1.查找员工</span>    NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Employee"</span>];    NSPredicate *pre = [NSPredicate predicateWithFormat:@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"name=%@"</span>,name];    request<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.predicate</span> = pre;    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">return</span> [<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.context</span> executeFetchRequest:request error:<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">nil</span>];}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li></ul>

CoreData 删除数据

<code class="hljs objectivec has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#pragma mark 删除员工</span>- (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">IBAction</span>)deleteEmployee:(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">id</span>)sender {    [<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span> deleteEmployeeWithName:@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"lisi"</span>];}-(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span>)deleteEmployeeWithName:(<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSString</span> *)name{    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 删除zhangsan</span>    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 1.查找到zhangsan</span>    NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Employee"</span>];    NSPredicate *pre = [NSPredicate predicateWithFormat:@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"name=%@"</span>,name];    request<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.predicate</span> = pre;    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 2.删除zhangsan</span>    <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSArray</span> *emps = [<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.context</span> executeFetchRequest:request error:<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">nil</span>];    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> (Employee *emp in emps) {        <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSLog</span>(@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"删除员工的人 %@"</span>,emp<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.name</span>);        [<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.context</span> deleteObject:emp];    }    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 3.用context同步下数据库</span>    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//所有的操作暂时都是在内存里，调用save 同步数据库</span>    [<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.context</span> save:<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">nil</span>];}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li></ul>

CoreData 查询数据

<code class="hljs objectivec has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;"><span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#pragma mark 读取员工信息</span>- (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">IBAction</span>)readEmployee:(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">id</span>)sender {    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//创建一个请求对象 （填入要查询的表名-实体类）</span>    NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Employee"</span>];    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 过滤查询</span>    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 查找张三 并且身高大于1.8</span>    NSPredicate *pre = [NSPredicate predicateWithFormat:@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"name=%@ AND height > %@"</span>,@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"zhangsan"</span>,@(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">1.8</span>)];<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//    request.predicate = pre;</span>    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//排序 以身高进行升序</span>    NSSortDescriptor *sort = [NSSortDescriptor sortDescriptorWithKey:@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"height"</span> ascending:<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">NO</span>];<span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//    request.sortDescriptors = @[sort];</span>    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 分页查询 总共13条数据 每页显示5条数据</span>    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//第一页的数据</span>    request<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.fetchLimit</span> = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">5</span>;    request<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.fetchOffset</span> = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">10</span>;    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//读取信息</span>    <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSError</span> *error = <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">nil</span>;    <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSArray</span> *emps = [<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.context</span> executeFetchRequest:request error:&error];    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (!error) {        <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSLog</span>(@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"emps: %@"</span>,emps);        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> (Employee *emp in emps) {            <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSLog</span>(@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"%@ %@ %@"</span>,emp<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.name</span>,emp<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.age</span>,emp<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.height</span>);        }    }<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span>{        <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSLog</span>(@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"%@"</span>,error);    }}<span class="hljs-preprocessor" style="color: rgb(68, 68, 68); box-sizing: border-box;">#pragma mark 添加员工信息</span>- (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">IBAction</span>)addEmployee:(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">id</span>)sender {    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 创建员工</span>    Employee *emp1 = [NSEntityDescription insertNewObjectForEntityForName:@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Employee"</span> inManagedObjectContext:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.context</span>];    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 设置员工属性</span>    emp1<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.name</span> = @<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"lisi"</span>;    emp1<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.age</span> = @<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">28</span>;    emp1<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.height</span> = @<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2.10</span>;    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//保存 - 通过上下文操作</span>    <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSError</span> *error = <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">nil</span>;    [<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.context</span> save:&error];    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (!error) {        <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSLog</span>(@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"success"</span>);    }<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span>{        <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSLog</span>(@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"%@"</span>,error);    } }</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li><li style="box-sizing: border-box; padding: 0px 5px;">52</li><li style="box-sizing: border-box; padding: 0px 5px;">53</li><li style="box-sizing: border-box; padding: 0px 5px;">54</li><li style="box-sizing: border-box; padding: 0px 5px;">55</li><li style="box-sizing: border-box; padding: 0px 5px;">56</li></ul>

CoreData 创建上下文

<code class="hljs objectivec has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;">-(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span>)setupContext{    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 1.上下文 关联Company.xcdatamodeld 模型文件</span>    NSManagedObjectContext *context = [[NSManagedObjectContext alloc] init];    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 关联模型文件</span>    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 创建一个模型对象</span>    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 传一个nil 会把 bundle下的所有模型文件 关联起来</span>    NSManagedObjectModel *model = [NSManagedObjectModel mergedModelFromBundles:<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">nil</span>];    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 持久化存储调度器</span>    NSPersistentStoreCoordinator *store = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:model];    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 存储数据库的名字</span>    <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSError</span> *error = <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">nil</span>;    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 获取docment目录</span>    <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSString</span> *doc = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">YES</span>) lastObject];    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 数据库保存的路径</span>    <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSString</span> *sqlitePath = [doc stringByAppendingPathComponent:@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"company.sqlite"</span>];    [store addPersistentStoreWithType:NSSQLiteStoreType configuration:<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">nil</span> URL:[<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSURL</span> fileURLWithPath:sqlitePath] options:<span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">nil</span> error:&error];    context<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.persistentStoreCoordinator</span> = store;    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.context</span> = context;}-(<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span>)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 创建员工</span>    <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">for</span> (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">int</span> i = <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">0</span>; i < <span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">10</span>; i++) {        Employee *emp1 = [NSEntityDescription insertNewObjectForEntityForName:@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"Employee"</span> inManagedObjectContext:<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.context</span>];        <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 设置员工属性</span>        emp1<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.name</span> = [<span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSString</span> stringWithFormat:@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"wangwu %d"</span>,i];        emp1<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.age</span> = @(<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">28</span> + i);        emp1<span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.height</span> = @<span class="hljs-number" style="color: rgb(0, 102, 102); box-sizing: border-box;">2.10</span>;        <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">//保存 - 通过上下文操作</span>        <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSError</span> *error = <span class="hljs-literal" style="color: rgb(0, 102, 102); box-sizing: border-box;">nil</span>;        [<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span><span class="hljs-variable" style="color: rgb(102, 0, 102); box-sizing: border-box;">.context</span> save:&error];        <span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">if</span> (!error) {            <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSLog</span>(@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"success"</span>);        }<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">else</span>{            <span class="hljs-built_in" style="color: rgb(102, 0, 102); box-sizing: border-box;">NSLog</span>(@<span class="hljs-string" style="color: rgb(0, 136, 0); box-sizing: border-box;">"%@"</span>,error);        }    }  }<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">@end</span></code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li><li style="box-sizing: border-box; padding: 0px 5px;">9</li><li style="box-sizing: border-box; padding: 0px 5px;">10</li><li style="box-sizing: border-box; padding: 0px 5px;">11</li><li style="box-sizing: border-box; padding: 0px 5px;">12</li><li style="box-sizing: border-box; padding: 0px 5px;">13</li><li style="box-sizing: border-box; padding: 0px 5px;">14</li><li style="box-sizing: border-box; padding: 0px 5px;">15</li><li style="box-sizing: border-box; padding: 0px 5px;">16</li><li style="box-sizing: border-box; padding: 0px 5px;">17</li><li style="box-sizing: border-box; padding: 0px 5px;">18</li><li style="box-sizing: border-box; padding: 0px 5px;">19</li><li style="box-sizing: border-box; padding: 0px 5px;">20</li><li style="box-sizing: border-box; padding: 0px 5px;">21</li><li style="box-sizing: border-box; padding: 0px 5px;">22</li><li style="box-sizing: border-box; padding: 0px 5px;">23</li><li style="box-sizing: border-box; padding: 0px 5px;">24</li><li style="box-sizing: border-box; padding: 0px 5px;">25</li><li style="box-sizing: border-box; padding: 0px 5px;">26</li><li style="box-sizing: border-box; padding: 0px 5px;">27</li><li style="box-sizing: border-box; padding: 0px 5px;">28</li><li style="box-sizing: border-box; padding: 0px 5px;">29</li><li style="box-sizing: border-box; padding: 0px 5px;">30</li><li style="box-sizing: border-box; padding: 0px 5px;">31</li><li style="box-sizing: border-box; padding: 0px 5px;">32</li><li style="box-sizing: border-box; padding: 0px 5px;">33</li><li style="box-sizing: border-box; padding: 0px 5px;">34</li><li style="box-sizing: border-box; padding: 0px 5px;">35</li><li style="box-sizing: border-box; padding: 0px 5px;">36</li><li style="box-sizing: border-box; padding: 0px 5px;">37</li><li style="box-sizing: border-box; padding: 0px 5px;">38</li><li style="box-sizing: border-box; padding: 0px 5px;">39</li><li style="box-sizing: border-box; padding: 0px 5px;">40</li><li style="box-sizing: border-box; padding: 0px 5px;">41</li><li style="box-sizing: border-box; padding: 0px 5px;">42</li><li style="box-sizing: border-box; padding: 0px 5px;">43</li><li style="box-sizing: border-box; padding: 0px 5px;">44</li><li style="box-sizing: border-box; padding: 0px 5px;">45</li><li style="box-sizing: border-box; padding: 0px 5px;">46</li><li style="box-sizing: border-box; padding: 0px 5px;">47</li><li style="box-sizing: border-box; padding: 0px 5px;">48</li><li style="box-sizing: border-box; padding: 0px 5px;">49</li><li style="box-sizing: border-box; padding: 0px 5px;">50</li><li style="box-sizing: border-box; padding: 0px 5px;">51</li></ul>

调用

<code class="hljs objectivec has-numbering" style="display: block; padding: 0px; background-color: transparent; color: inherit; box-sizing: border-box; font-family: 'Source Code Pro', monospace;font-size:undefined; white-space: pre; border-top-left-radius: 0px; border-top-right-radius: 0px; border-bottom-right-radius: 0px; border-bottom-left-radius: 0px; word-wrap: normal; background-position: initial initial; background-repeat: initial initial;">- (<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">void</span>)viewDidLoad {    [<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">super</span> viewDidLoad];    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 创建一个数据库 company.sqlite</span>    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 数据库要一张表 员工表 （name,age,heigt）</span>    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// 往数据添加员工信息</span>    <span class="hljs-comment" style="color: rgb(136, 0, 0); box-sizing: border-box;">// CoreData</span>    [<span class="hljs-keyword" style="color: rgb(0, 0, 136); box-sizing: border-box;">self</span> setupContext];}</code><ul class="pre-numbering" style="box-sizing: border-box; position: absolute; width: 50px; background-color: rgb(238, 238, 238); top: 0px; left: 0px; margin: 0px; padding: 6px 0px 40px; border-right-width: 1px; border-right-style: solid; border-right-color: rgb(221, 221, 221); list-style: none; text-align: right;"><li style="box-sizing: border-box; padding: 0px 5px;">1</li><li style="box-sizing: border-box; padding: 0px 5px;">2</li><li style="box-sizing: border-box; padding: 0px 5px;">3</li><li style="box-sizing: border-box; padding: 0px 5px;">4</li><li style="box-sizing: border-box; padding: 0px 5px;">5</li><li style="box-sizing: border-box; padding: 0px 5px;">6</li><li style="box-sizing: border-box; padding: 0px 5px;">7</li><li style="box-sizing: border-box; padding: 0px 5px;">8</li></ul>

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iOS开发 - CoreData框架 数据持久化

[置顶] iOS开发 - CoreData框架 数据持久化