Question

当我在两个条件下运行查询获取详细信息时？出错

未处理的异常：

DatabaseException（“ 2019”附近：语法错误（代码1）：

，在编译时：SELECT monthyear FROM metersd WHERE shopid=1 AND monthyear = August 2019) sql 'SELECT monthyear FROM metersd WHERE shopid=1 AND monthyear = August 2019' args []}

SELECT monthyear FROM metersd WHERE shopid=1 AND monthyear =  August 2019

Future<MeterData> getMonthYear(int uid,String month) async {
    var dbClient = await db;
    var result = await dbClient.rawQuery("SELECT monthyear FROM $table WHERE $shopid=$uid AND $monthyear = $month");

    if (result.length == 0) return null;
    return MeterData.fromMap(result.first);

  }

Answer 1

SELECT monthyear FROM $table WHERE $shopid=$uid AND 
 $monthyear="+"'$month'",null)

当'condition1'和'condition2'时在逻辑查询中仅添加单个qoute

Future<MeterData> getMonthYear(int uid,String month) async {
var dbClient = await db;
var result = await dbClient.rawQuery("SELECT monthyear FROM $table WHERE $shopid=$uid AND $monthyear="+"'$month'",null);

if (result.length == 0) return null;
return MeterData.fromMap(result.first);
}

Flutter Sqlite查询错误数据获取错误

1 个答案: