iOS FMDB的使用(增,删,改,查,sqlite存取图片)

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在上一篇博客我对sqlite的基本使用进行了详细介绍...
但是在实际开发中原生使用的频率是很少的...
这篇博客我将会较全面的介绍FMDB的使用...
例: 增,删,改,查,sqlite存取图片

有关框架的导入我在上一篇博客进行了详细介绍这里就不在介绍,没有看到上一篇博客的可以点击下面的连接.

iOS sqlite3 的基本使用(增 删 改 查)

接下来我会按照上篇博客的顺序,模式进行介绍.
(增删改查与sqlite存取图片我会通过两个工程介绍)

创建数据库与表

代码:

@interface ViewController ()@property (nonnull, strong) FMDatabase * database;@end

- (void)viewDidLoad {        [super viewDidLoad];    //数据库在沙盒中的路径    NSString * fileName = [[NSSearchPathForDirectoriesInDomains(13, 1, 1)lastObject]stringByAppendingPathComponent:@"testOfFMDB.sqlite"];    NSLog(@"%@",fileName);        //创建数据库    self.database = [[FMDatabase alloc]initWithPath:fileName];        //打开数据库    if ([self.database open]) {        NSLog(@"打开数据库成功");        //创建表 返回值为BOOL        BOOL flag = [self.database executeUpdate:@"create table if not exists t_testOfFMDB (id integer primary key autoincrement,name text)"];        if (flag) {            NSLog(@"成功建表");        }else{            NSLog(@"失败建表");        }            //关闭数据库        [self.database close];            }else{        NSLog(@"打开数据库失败");    }    }

图片(创建数据库与表)

增

代码:

- (IBAction)insert:(id)sender {        if ([self.database open]) {        for (NSInteger i = 0; i < 100; i ++) {                        BOOL flag = [self.database executeUpdate:@"insert into t_testOfFMDB (name) values(?)",[NSString stringWithFormat:@"旭宝爱吃鱼--%zd",arc4random_uniform(99)]];                        if (flag) {                NSLog(@"插入成功");            }else{                NSLog(@"插入失败");            }                    }    }    [self.database close];}

图片(增)

删

代码:

- (IBAction)delete:(id)sender {        if ([self.database open]) {        for (NSInteger i = 0; i < 100; i ++) {                        BOOL flag = [self.database executeUpdate:@"delete from t_testOfFMDB where id < 50"];                        if (flag) {                NSLog(@"删除成功");            }else{                NSLog(@"删除失败");            }                    }    }    [self.database close];    }

图片(删)

改

代码:

- (IBAction)update:(id)sender {        if ([self.database open]) {        for (NSInteger i = 0; i < 100; i ++) {                        BOOL flag = [self.database executeUpdate:@"update t_testOfFMDB set name = 'hello world' where id > 50"];                        if (flag) {                NSLog(@"修改成功");            }else{                NSLog(@"修改失败");            }                    }    }    [self.database close];}

图片(改)

查

代码:

- (IBAction)select:(id)sender {        if ([self.database open]) {                //返回查询数据的结果集        FMResultSet * resultSet = [self.database executeQuery:@"select * from t_testOfFMDB"];        //查询表中的每一个记录        while ([resultSet next]) {                        NSString * name = [resultSet stringForColumn:@"name"];            NSLog(@"%@",name);                    }            }    [self.database close];}

图片(查)

整体代码

////  ViewController.m//  FMDB的使用////  Created by ma c on 16/5/10.//  Copyright © 2016年 xubaoaichiyu. All rights reserved.//#import "ViewController.h"#import "FMDB.h"@interface ViewController ()@property (nonnull, strong) FMDatabase * database;@property (weak, nonatomic) IBOutlet UIImageView *imageView;@end@implementation ViewController- (void)viewDidLoad {        [super viewDidLoad];    //数据库在沙盒中的路径    NSString * fileName = [[NSSearchPathForDirectoriesInDomains(13, 1, 1)lastObject]stringByAppendingPathComponent:@"testOfFMDB.sqlite"];    NSLog(@"%@",fileName);        //创建数据库    self.database = [[FMDatabase alloc]initWithPath:fileName];        //打开数据库    if ([self.database open]) {        NSLog(@"打开数据库成功");        //创建表 返回值为BOOL        BOOL flag = [self.database executeUpdate:@"create table if not exists t_testOfFMDB (id integer primary key autoincrement,name text)"];        if (flag) {            NSLog(@"成功建表");        }else{            NSLog(@"失败建表");        }            //关闭数据库        [self.database close];            }else{        NSLog(@"打开数据库失败");    }    }- (IBAction)insert:(id)sender {        if ([self.database open]) {        for (NSInteger i = 0; i < 100; i ++) {                        BOOL flag = [self.database executeUpdate:@"insert into t_testOfFMDB (name) values(?)",[NSString stringWithFormat:@"旭宝爱吃鱼--%zd",arc4random_uniform(99)]];                        if (flag) {                NSLog(@"插入成功");            }else{                NSLog(@"插入失败");            }                    }    }    [self.database close];}- (IBAction)update:(id)sender {        if ([self.database open]) {        for (NSInteger i = 0; i < 100; i ++) {                        BOOL flag = [self.database executeUpdate:@"update t_testOfFMDB set name = 'hello world' where id > 50"];                        if (flag) {                NSLog(@"修改成功");            }else{                NSLog(@"修改失败");            }                    }    }    [self.database close];}- (IBAction)update:(id)sender {        if ([self.database open]) {        for (NSInteger i = 0; i < 100; i ++) {                        BOOL flag = [self.database executeUpdate:@"update t_testOfFMDB set name = 'hello world' where id > 50"];                        if (flag) {                NSLog(@"修改成功");            }else{                NSLog(@"修改失败");            }                    }    }    [self.database close];}- (IBAction)select:(id)sender {        if ([self.database open]) {                //返回查询数据的结果集        FMResultSet * resultSet = [self.database executeQuery:@"select * from t_testOfFMDB"];        //查询表中的每一个记录        while ([resultSet next]) {                        NSString * name = [resultSet stringForColumn:@"name"];            NSLog(@"%@",name);                    }            }    [self.database close];}@end

sqlite存取图片

这里有几点注意:

• 图片无法直接存入数据库中需要把图片转换为二进制后存入数据库
• 二进制存储的格式为 blob

整体代码

////  ViewController.m//  FMDB的使用////  Created by ma c on 16/5/10.//  Copyright © 2016年 xubaoaichiyu. All rights reserved.//#import "ViewController.h"#import "FMDB.h"@interface ViewController ()@property (nonnull, strong) FMDatabase * database;@property (weak, nonatomic) IBOutlet UIImageView *imageView;@end@implementation ViewController- (void)viewDidLoad {        [super viewDidLoad];    //数据库在沙盒中的路径    NSString * fileName = [[NSSearchPathForDirectoriesInDomains(13, 1, 1)lastObject]stringByAppendingPathComponent:@"testOfFMDB.sqlite"];    NSLog(@"%@",fileName);        //创建数据库    self.database = [[FMDatabase alloc]initWithPath:fileName];        //打开数据库    if ([self.database open]) {        NSLog(@"打开数据库成功");        //创建表 返回值为BOOL        BOOL flag = [self.database executeUpdate:@"create table if not exists t_testOfFMDB (id integer primary key autoincrement,image blob)"];        if (flag) {            NSLog(@"成功建表");        }else{            NSLog(@"失败建表");        }            //关闭数据库        [self.database close];            }else{        NSLog(@"打开数据库失败");    }    }- (IBAction)insert:(id)sender {        if ([self.database open]) {                NSData * data = UIImageJPEGRepresentation([UIImage imageNamed:@"BG.jpg"], 1);                    BOOL flag = [self.database executeUpdate:@"insert into t_testOfFMDB (image) values(?)",data];                        if (flag) {                NSLog(@"插入成功");            }else{                NSLog(@"插入失败");            }                        }    [self.database close];}- (IBAction)delete:(id)sender {        if ([self.database open]) {                    BOOL flag = [self.database executeUpdate:@"delete from t_testOfFMDB"];                        if (flag) {                NSLog(@"删除成功");            }else{                NSLog(@"删除失败");            }                    }    [self.database close];    }- (IBAction)update:(id)sender {        if ([self.database open]) {                    NSData * data = UIImageJPEGRepresentation([UIImage imageNamed:@"CX.jpg"], 1);                        BOOL flag = [self.database executeUpdate:@"update t_testOfFMDB set image = ?",data];                        if (flag) {                NSLog(@"修改成功");            }else{                NSLog(@"修改失败");            }                    }    [self.database close];}- (IBAction)select:(id)sender {        if ([self.database open]) {                //返回查询数据的结果集        FMResultSet * resultSet = [self.database executeQuery:@"select * from t_testOfFMDB"];        //查询表中的每一个记录        while ([resultSet next]) {                                    NSData * data = [resultSet dataForColumn:@"image"];                        UIImage * image = [UIImage imageWithData:data];                        self.imageView.image = image;                    }            }    [self.database close];}@end