Sqlite 数据检索问题

Question

我有一个 SQLite 数据库，当我尝试从数据库获取数据时，我会重复获取最后插入的元素。我怎样才能获得所有元素而不重复。

我写的代码：

- (NSMutableArray *) gettingData {


    sqlDict = [[NSMutableDictionary alloc] init];

    membersInfoArray =[[NSMutableArray alloc]init ];


     [self checkAndCreateDatabase];

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

    const char *sql = "select * from ProductList";

     sqlite3_stmt *selectstmt;
    if(sqlite3_prepare_v2(database, sql, -1, &selectstmt, NULL) == SQLITE_OK) 
    {
        while(sqlite3_step(selectstmt) == SQLITE_ROW)
        {


       NSString *prdbcode = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstmt, 0)];

     [sqlDict setObject:prdbcode forKey:@"Barcode"];


     [prdbcode release];


      NSString *prdname = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstmt, 1)]; 


     [sqlDict setObject:prdname forKey:@"ProductName"];

      [prdname release];
       NSString *prdDesc = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstmt, 2)];
      [sqlDict setObject:prdDesc forKey:@"ProductDescription"];
      [prdDesc release];
      NSString *prdstatus = [NSString stringWithUTF8String:(char *)sqlite3_column_text(selectstmt, 3)];

     [sqlDict setObject:prdstatus forKey:@"ProductStatus"];
     [prdstatus release];
     [membersInfoArray addObject:sqlDict];
     [sqlDict release];

        }

     }

     sqlite3_finalize(selectstmt);   

     }

     sqlite3_close(database);
     return membersInfoArray;
    }

我正在检索数据如下：

NSMutableArray *sqlArray = [sqlViewController gettingData]; 

谢谢。

Answer 1

只需全局声明您的数组，而不是在您的方法中本地声明。你的问题将会得到解决。