OC数据存储大集合2（手把手教你全搞定）

以下模型类

在LLUser.h中

#import <Foundation/Foundation.h>

@interface LLUser : NSObject

@property (nonatomic ,strong)NSString *userName;

@property (nonatomic ,strong)NSString *userAge;

@property (nonatomic ,strong)NSString *ids;

@end

在LLUser.m文件中

#import "LLUser.h"

@implementation LLUser

- (void)dealloc

{

    self.userAge = nil;

    self.userName = nil;

}

@end

以下是数据接口管理类

在LLDataManager.h的类中

#import <Foundation/Foundation.h>

#import "FMDatabase.h"

@class LLUser;

@interface LLDataManager : NSObject

@property (nonatomic ,strong)FMDatabase *fmdb;

+ (LLDataManager *)defaultDataBase;

- (void)insertUser:(LLUser *)user;

- (NSMutableArray *)selectData;

- (void)deleteData:(LLUser *)item;

- (void)updateData:(LLUser *)item;

@end

在LLDataManager.m的类中

#import "LLDataManager.h"

#import "FMDatabase.h"

#import "LLUser.h"

static LLDataManager *dataManager =nil;

@implementation LLDataManager

+ (LLDataManager *)defaultDataBase

{

    static dispatch_once_t onceToken;

    dispatch_once(&onceToken, ^{

        dataManager = [[LLDataManageralloc] init];

    });

    returndataManager;

}

- (id)init

{

    if (self == [superinit])

    {

        [self createData];

    }

    return self;

}

//创建表

- (void)createData

{

    NSString *path = [LLDataManagerpathWithFilePath:@"myCommunity.db"];

    self.fmdb = [FMDatabasedatabaseWithPath:path];

    if ([self.fmdbopen])

    {

        [self createTable];

    }

}

- (void)createTable

{

    NSString *sql =@"CREATE TABLE IF NOT EXISTS user (id INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL,name TEXT(1024),age TEXT(1024))";

    if ([self.fmdbexecuteUpdate:sql])

    {

        NSLog(@"seccuss");

    }

    else

    {

        NSLog(@"fail");

    }

}

//验证数据是否存在

- (BOOL)isExistUser:(LLUser *)user

{

    NSLog(@"%@",user.userName);

    NSString *sql = [NSStringstringWithFormat:@"SELECT name FROM user WHERE name = ?"];

    FMResultSet *result = [self.fmdbexecuteQuery:sql,user.userName];

    while ([result next])

    {

        return YES;

    }

    return NO;

}

//增加

- (void)insertUser:(LLUser *)user

{

    if ([self isExistUser:user])

    {

        NSLog(@"记录已经存在");

        return;

    }

    

    NSString *sql = [NSStringstringWithFormat:@"INSERT INTO user(name,age) VALUES(?,?)"];

    if ([self.fmdbexecuteUpdate:sql,user.userName,user.userAge])

    {

        NSLog(@"insert Success");

        

        UIAlertView *alert = [[UIAlertViewalloc] initWithTitle:@"insert User"message:@"success"delegate:selfcancelButtonTitle:@"ok"otherButtonTitles:nil,nil];

        [alert show];

    }

}

//删除

- (void)deleteData:(LLUser *)item

{

    NSString *sql = [NSStringstringWithFormat:@"DELETE FROM user WHERE id = ?"];

    if ([self.fmdbexecuteUpdate:sql,item.ids])

    {

        NSLog(@"delete success");

    }

}

//修改

- (void)updateData:(LLUser *)item

{

    NSString *sql = [NSStringstringWithFormat:@"UPDATE user SET name = ?,age = ? WHERE id = ?"];

    [self.fmdbexecuteUpdate:sql,item.userName,item.userAge,item.ids];

}

+ (NSString *)pathWithFilePath:(NSString *)dataBaseName

{

    NSString *path = NSHomeDirectory();

    if (dataBaseName.length > 0)

    {

        path = [path stringByAppendingFormat:@"/tmp/%@",dataBaseName];

    }

    return path;

}

//查询获取数据

- (NSMutableArray *)selectData

{

    NSMutableArray *array = [NSMutableArrayarrayWithCapacity:0];

    NSString *sql = [NSStringstringWithFormat:@"SELECT id,name,age FROM user"];

    FMResultSet *result = [self.fmdbexecuteQuery:sql];

    while ([result next])

    {

        LLUser *item = [[LLUseralloc] init];

        

        item.ids = [result stringForColumn:@"id"];

        item.userName = [result stringForColumn:@"name"];

        item.userAge = [result stringForColumn:@"age"];

        [array addObject:item];

    }

    return array;

}

@end

注意使用的时候，记得导入依赖框架libsqlite3.dylib,在接口类中导入FMDatabase.h文件