Question

我的问题是我试图通过在我的Sql代码中使用2 where语句插入到表中。

我的代码：

using (SqlConnection conn = new SqlConnection(@"Connection String"))
{
   conn.Open();

   using (var cmd = new SqlCommand(@"INSERT INTO AssignPlan
         (Reps, Sets, WeightOrTime, Date, MemberId, ExerciseId) 
         Select @Reps, @Sets, @WeightOrTime, @Date, 
         Members.MemberId From Members Where Members.Username = @Username, 
         ExerciseDisplay.ExerciseId From ExerciseDisplay 
         Where ExerciseDisplay.ExerciseName = @Exercise", conn))
   {
      cmd.Parameters.AddWithValue("@Reps", txtReps.Text);
      cmd.Parameters.AddWithValue("@Sets", txtSets.Text);
      cmd.Parameters.AddWithValue("@WeightOrTime", txtWeight.Text);
      cmd.Parameters.AddWithValue("@Date", txtDate.Text);
      cmd.Parameters.AddWithValue("@Username", lblRegistered.Text);
      cmd.Parameters.AddWithValue("@Exercise", txtName.Text);

      cmd.ExecuteNonQuery();

      Response.Redirect("Success.aspx");
   }

   conn.Close();

关于如何重新定义我的SQL语句的任何想法？任何帮助将不胜感激！

Answer 1

假设会员与ExerciseDisplay之间没有关系，您可以进行交叉连接并过滤结果：

using (var cmd = new SqlCommand(
    " INSERT INTO AssignPlan " + 
    " (Reps, Sets, WeightOrTime, Date, MemberId, ExerciseId)  " + 
    " Select  " + 
    " @Reps, @Sets, @WeightOrTime, @Date, Members.MemberId, ExerciseDisplay.ExerciseId " + 
    " From Members, ExerciseDisplay  " + 
    " Where ExerciseDisplay.ExerciseName = @Exercise " + 
    " AND Members.Username = @Username ", conn))

或者，因为您只是从每个表中提取一个值，所以子查询也应该起作用：

using (var cmd = new SqlCommand(
    " INSERT INTO AssignPlan " + 
    " (Reps, Sets, WeightOrTime, Date, MemberId, ExerciseId)  " + 
    " Select  " + 
    " @Reps, @Sets, @WeightOrTime, @Date, " +
    " (SELECT MemberId FROM Members WHERE Username = @Username), " +
    " (SELECT ExerciseId FROM ExerciseDisplay WHERE ExerciseName = @Exercise) "  
    , conn))

但这要求每个子查询只返回一个值。

使用参数插入表

1 个答案: