SQLite 的创建与编辑

创建数据库语句

-(void)creatData

{

     sqlite3 *sqlite = nil;

    

    NSString *filePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/data.file" ];

    

    //打开数据库

    int result  = sqlite3_open([filePath  UTF8String], &sqlite);

    if (result !=SQLITE_OK) {

        NSLog(@"创建失败！！！");

        return ;

    }

    

    //创建表的SQL语句

    

    NSString *sql = @"CREATE TABLE IF NOT EXISTS UserTable(userName text PRIMARY KEY ,password text,email text)";

    //执行SQL语句

    char *error;

    result = sqlite3_exec(sqlite, [sql  UTF8String], NULL, NULL, &error);

    if (result != SQLITE_OK) {

        NSLog(@"创建数据库失败：%s",error);

        return ;

    }

    //插如入一条数据

    //INSERT OR REPLACE INTO UserTable (userName,password,email) VALUES(?,?,?);

    //更新一条数据

    //UPDATE UserTable set password = '' where userName = '';

    

    //查询数据

    

    //SELECT userName ,password,eamil FROM UserTable where username = '';

   

    //删除数据

   // DELETE FROM UserTable WHERE username ='';

    

    //关闭数据库

    

    sqlite3_close(sqlite);

    

 

}

**************************

-(void)editData

{

    sqlite3 *sqlite = nil;

    //句柄语句

    sqlite3_stmt *stmt =nil;

    

    //数据库

    NSString *filePath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/data.file"];

    int result  = sqlite3_open([filePath  UTF8String], &sqlite);

    if (result !=SQLITE_OK) {

        NSLog(@"打开数据库失败！！！");

        return ;

    }

    

    //创建SQL 语句

    NSString *sql = @" INSERT INTO UserTable (userName,password,email) VALUES (? ,?, ?)";

    

    //编译SQL语句

    sqlite3_prepare_v2(sqlite, [sql UTF8String], -1, &stmt, NULL);

    NSString *userName = @"张三";

    NSString *password = @"123456";

    NSString *email    = @"mxyd.qq";

    

    //绑定填充SQL语句

    sqlite3_bind_text(stmt, 1, [userName UTF8String], -1, NULL);

    sqlite3_bind_text(stmt, 2, [password UTF8String], -1, NULL);

    sqlite3_bind_text(stmt, 3, [email UTF8String], -1, NULL);

    SQL编辑语句

    //执行SQL语句

     result = sqlite3_step(stmt);

     if (result == SQLITE_ERROR || result  == SQLITE_MISUSE) {

        NSLog(@"编译数据库出错！！！");

        return;

    }

    

    //关闭句柄语句

    sqlite3_finalize(stmt);

    

    //关闭数据库

    sqlite3_close(sqlite);

    NSLog(@"数据插入成功！！！");

 

}