sqlite的，选择查询不起作用

- (UserInfo*)getCurrentUserInfo:(NSString*)userName 
{ 
    UserInfo *userInfo = [[UserInfo alloc]init]; 

    sqlite3 *database; 
    sqlite3_stmt *selectstmt; 
    NSLog(@"userName:%@",userName); 
    if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) { 
     NSString *sqlString = [NSString stringWithFormat:@"SELECT USER_LEVEL FROM USER_INFO WHERE USER_NAME = '%@'" , userName]; 
     NSLog(@"getCurrentUserInfo:%@",sqlString); 
     const char *SqlCommand = [sqlString UTF8String]; 
     if (sqlite3_prepare_v2(database, SqlCommand, -1, &selectstmt, NULL) == SQLITE_OK) { 
      NSLog(@"success!"); 
      while (sqlite3_step(selectstmt) == SQLITE_ROW) { 
       NSString *userInfoStr = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstmt, 0)]; 
       NSLog(@"select result:%@",userInfoStr); 
      } 
     } 
     sqlite3_finalize(selectstmt); 
    } 
    sqlite3_close (database); 
    return userInfo; 
}

下面是我的日志输出：sqlite的，选择查询不起作用

2012-03-06 17:50:11.556 MagicWords[508:f803] userName:Tan 
2012-03-06 17:50:11.557 MagicWords[508:f803] getCurrentUserInfo:SELECT USER_LEVEL FROM USER_INFO WHERE USER_NAME = 'Tan'

它不打印“成功”，所以sqlite3_prepare_v2不返回yes.but我的数据库是确定：

我找不到问题？

来源

2012-03-06 Tan

让我看看你的数据库路径 – Hector 2012-03-06 10:38:17

添加sqlite错误消息。它会给你一个洞察内部发生的事情。如果所有的数据库都是正确的，请检查表名。

UserInfo *userInfo = [[UserInfo alloc]init]; 

    sqlite3 *database; 
    sqlite3_stmt *selectstmt; 
    NSLog(@"userName:%@",userName); 
    if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) { 
     NSString *sqlString = [NSString stringWithFormat:@"SELECT USER_LEVEL FROM USER_INFO WHERE USER_NAME = '%@'" , userName]; 
     NSLog(@"getCurrentUserInfo:%@",sqlString); 
     const char *SqlCommand = [sqlString UTF8String]; 
     if (sqlite3_prepare_v2(database, SqlCommand, -1, &selectstmt, NULL) == SQLITE_OK) { 
      NSLog(@"success!"); 
      while (sqlite3_step(selectstmt) == SQLITE_ROW) { 
       NSString *userInfoStr = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstmt, 0)]; 
       NSLog(@"select result:%@",userInfoStr); 
      } 
     } 
     //Add the error message here. 
     else 
     { 

     NSLog(@"%s",sqlite3_errmsg(database)); 

     } 
     /////// 
     sqlite3_finalize(selectstmt); 
    } 
    sqlite3_close (database); 
    return userInfo;

来源

2012-03-06 10:37:46 Vignesh

非常感谢你，用你的方法，我找到了问题！ – Tan 2012-03-06 12:37:51

删除sqlString末尾的''和'Use Semicolon'中的引号。

NSString *sqlString = [NSString stringWithFormat:@"SELECT USER_LEVEL FROM USER_INFO WHERE USER_NAME = %@;" , userName];

来源

2012-03-06 10:20:34

尝试此当要转换的SqlString为char

常量字符*的SqlCommand =（字符*）[的SqlString cStringUsingEncoding：NSUTF8StringEncoding];

来源

2012-03-06 10:38:57 hchouhan02

sqlite的，选择查询不起作用

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