FMDB - 錯誤調用sqlite3_step（21：內存不足）RS

Question

我在我的代碼集成FMDB庫，我嘗試在單一功能加載多個查詢，但我收到了一些問題

* Error calling sqlite3_step (21: out of memory) rs 
* FMDB not open 
* FMDB is in use 

是否有可能要在單個函數中運行多個查詢？請讓我知道您的意見。

由於提前

我想這FYI：

-(NSMutableArray *)getMyInfo 
{ 
    NSMutableArray *contactList = [NSMutableArray array]; 

    if(![instance.database open]) 
    { 
     DLog(@"Could not open DB"); 
     return nil; 
    } 
    ********** QUERY 1 ************** 
    FMResultSet *resultSet=[instance.database executeQuery:@"SELECT * FROM mycontacts WHERE cont_hidden = 0 and cont_recent_chat_time IS NOT NULL ORDER BY strftime(cont_recent_chat_time) DESC"]; 
    if(resultSet) 
    { 
     while([resultSet next]) 
     { 
      @autoreleasepool 
      { 
       int type = [resultSet intForColumn:@"contact_type"]; 
       Contactbean *contactObj = [[Contactbean alloc]init]; 
       [contactObj setPhoneNo:[resultSet stringForColumn:@"cont_phonenumber"]]; 

********** QUERY 2 **************

   FMResultSet *getCountResult=[instance.database executeQuery:@"SELECT count(kchatid) FROM mychat WHERE kisread = 0 and kchatnumber = ?",[resultSet stringForColumn:@"cont_phonenumber"]]; 
       if ([getCountResult next]) { 
        if([getCountResult intForColumnIndex:0] > 0) 
        { 
         [contactObj setCount:[getCountResult intForColumnIndex:0]]; 
        } 
       } 
       [getCountResult close]; 

********** QUERY 3 **************

   FMResultSet *getRecentResult=[instance.database executeQuery:@"SELECT * from mychat where kchatnumber =? AND kchattime =?",[resultSet stringForColumn:@"cont_phonenumber"],[resultSet stringForColumn:@"status"]]; 

       if([getRecentResult next]) 
       { 
        [contactObj setStatus:[getRecentResult intForColumn:@"status"]]; 
       } 
       [getRecentResult close]; 

       // Adding contact to the list 
       [contactList addObject:contactObj]; 
      } 
     } 
    } 
    [resultSet close]; 
    [instance.database close]; 
    return contactList; 
} 

Answer 1

你不打開和關閉正確的數據庫對象，應該是這樣的：

NSArray *docPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
    NSString *documentsDir = [docPaths objectAtIndex:0]; 
    NSString *dbPath = [documentsDir stringByAppendingPathComponent:@"theDataBase.sqlite"]; 
    FMDatabase *database = [FMDatabase databaseWithPath:dbPath]; 
    [database open];//Open the database 
    //Execute the update you want 
    [database executeUpdate:@"INSERT INTO some_table (something) values (?)", someValue]; 
    //Execute the consults you want 
    FMResultSet *results = [database executeQuery:@"SELECT * FROM some_table"]; 
     if ([results next]) 
     { 
      //Do something with the data it brings you 
     } 
    [database close];//Close the database 

不要忘記閱讀官方文檔： FMDB v2.5