Question

开始学习sql并遇到查询问题。我有 - 2表日历和活动和FK表DateActivities。有2个简单的列表日历与日期和活动。我希望能够通过单击按钮在所选日期通过文本框输入新活动。但是，当我这样做时，我得到一个查询错误。谢谢你的帮助。

private void btnAddToDate_Click(object sender, EventArgs e)
    {
        string query = "DECLARE @ActivitiesId TABLE (Id INT) " + 
                       "INSERT INTO Activities (Name) " +
                       "OUTPUT INSERTED.ID INTO @ActivitiesId Id(Id) " +
                       "VALUES (@ActivitiesName) " +
                       "INSERT INTO DateActivities VALUES (@CalendarId, @ActivitiesId)";

        using (connection = new SqlConnection(connectionString))
        using (SqlCommand command = new SqlCommand(query, connection))
        {
            connection.Open();
            command.Parameters.AddWithValue("@ActivitiesName", textDate.Text);
            command.Parameters.AddWithValue("@CalendarId", listCalendar.SelectedValue);
            command.ExecuteNonQuery();
        }

        FillCalendar();
        FillActivities();
    }

Answer 1

您正在尝试执行多个语句，因此需要将它们与;分隔为行终止符，如下所示，否则它将被视为要执行的单个语句。如果您只是在SSMS中复制/粘贴语句块，您将收到相同的错误。

"DECLARE @ActivitiesId TABLE (Id INT); " + 
                       "INSERT INTO Activities (Name) " +
                       "OUTPUT INSERTED.ID INTO @ActivitiesId Id(Id) " +
                       "VALUES (@ActivitiesName); " +
                       "INSERT INTO DateActivities VALUES (@CalendarId, @ActivitiesId)"

您最好将其关闭到存储过程，而不是作为adhoc查询运行。

Answer 2

您要将整个表格插入DateActivities的列值中，这显然是错误的并且会失败，您需要使用另一个变量来保存ActivityId，然后将其插入，请参阅下文：< / p>

"DECLARE @ActivitiesId TABLE (Id INT)
 DECLARE @ActivityId INT " + 
                       "INSERT INTO Activities (Name) " +
                       "OUTPUT INSERTED.ID INTO @ActivitiesId Id(Id) " +
                       "VALUES (@ActivitiesName) " +
                       "SELECT @ActivityId = Id from @ActivitiesId"
                       "INSERT INTO DateActivities VALUES (@CalendarId, @ActivityId)";

SQL查询执行顺序错误

2 个答案: