如何從數據庫中檢索多列數據？

我是這個數據庫編程的新手。我從數據庫中檢索單列數據，但我無法從數據庫檢索多列數據。如何從數據庫中檢索多列數據？

這裏是我的代碼

-(void) readItemsFromDatabaseforTable:(NSString *)tableName { 


    arrayItems = [[NSMutableArray alloc] init]; 


    if(sqlite3_open([databasePath UTF8String], &database) == SQLITE_OK) 
{ 

      NSString *sql_str = [NSString stringWithFormat:@"select * from %@", tableName]; 

     const char *sqlStatement = (char *)[sql_str UTF8String]; 

      NSLog(@"query %s",sqlStatement); 

     sqlite3_stmt *compiledStatement; 

if(sqlite3_prepare_v2(database, sqlStatement, -1, &compiledStatement, NULL) == SQLITE_OK) 
{ 

      while(sqlite3_step(compiledStatement) == SQLITE_ROW) { 

       NSString *idsstr = [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 3)];    

       [arrayItems addObject:idsstr]; 
       NSLog(@"*************** %@",arrayItems); 
      } 
      while(sqlite3_step(compiledStatement) == SQLITE_ROW) 
{ 

      NSString *caloriesstr = [NSString stringWithUTF8String: 

(char*)sqlite3_column_text(compiledStatement, 4)];    

       [caloriesarry addObject:caloriesstr]; 

       NSLog(@"naveenkumartesting"); 

       NSLog(@"*************** %@",caloriesarry); 

} 

}

我的主要目的是從數據庫中檢索列的數據，並存儲到多個陣列。

請你們誰能幫助我，

來源

2012-04-23 kumar

使用此示例查詢，並根據您的要求查詢..

NSString *str = [NSString stringWithFormat:@"Select * from Yourtablename where image1 = '%@' AND person1 = '%@' AND category = '%@' AND PurchaseAmt = '%@'",Str,person1,category,Amountdata];

Use this tutorial

來源

2012-04-23 04:54:52 Nit

在我的程序中，我能夠檢索單列數據，但鋤頭檢索多列數據。我嘗試了上述方法但沒有use.please給任何其他解決方案... – kumar 2012-04-23 05:08:09

你不需要循環與while第二次當你可以在一次獲得所有數據的同時如此：

const char *stmt = "select id, name from table1 where isImage = 1"; 
sqlite3_stmt *selectstmt; 
if (sqlite3_prepare_v2(database, stmt, -1, &selectstmt, NULL) == SQLITE_OK) { 
    while(sqlite3_step(selectstmt) == SQLITE_ROW) { 
     int rowid = sqlite3_column_int(selectstmt, 0); 
     NSString * name = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstmt, 1)]; 

    } 
}

來源

2012-04-23 04:59:43

如何從數據庫中檢索多列數據？

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