如何將多個SQL命令組合為一個？

Question

是否可以通過將以下查詢合並到單個SQLCommand中來優化它們？

SqlCommand cmd = new SqlCommand
{
    CommandType = CommandType.Text,
    CommandText = "DELETE FROM cbu_naslovi WHERE [ID]='" + CurrentID + "'",
    Connection = con
};
SqlCommand cmd1 = new SqlCommand
{
    CommandType = CommandType.Text,
    CommandText = "DELETE FROM cbu_deli WHERE [IDX]='" + CurrentID + "'",
    Connection = con
};
cmd.ExecuteNonQuery();
cmd1.ExecuteNonQuery();

編輯：社區建議的工作解決方案如下

SqlCommand cmd = new SqlCommand
{
    CommandType = CommandType.Text,
    CommandText = "DELETE FROM cbu_naslovi WHERE [ID] = @CurrentID; DELETE FROM cbu_deli WHERE [IDX] = @CurrentID",
    Connection = con
};
cmd.Parameters.AddWithValue("@CurrentID", CurrentID);
cmd.ExecuteNonQuery();

Answer 1

是的，您可以使用分號將它們分開。 例如，我有一個代碼，可以在一個調用中執行以下操作

SET NOCOUNT ON;
DECLARE @decimalDate DECIMAL(12,0);
DECLARE @charDate CHAR(12);
DECLARE @utcDate DATETIMEOFFSET;
DECLARE date_cursor CURSOR FOR SELECT {1} FROM {0} WHERE ISNULL({1},0)!=0;
OPEN date_cursor;
FETCH NEXT FROM date_cursor INTO @decimalDate;
WHILE @@FETCH_STATUS=0
BEGIN
    BEGIN TRY SET @charDate=CONVERT(CHAR(12),@decimalDate);
        SET @utcDate=SwitchOffset(
                CONVERT(DATETIME,'20'
                    +SUBSTRING(@charDate,1,2)+'-'+SUBSTRING(@charDate,3,2)+'-'
                    +SUBSTRING(@charDate,5,2)+' '+SUBSTRING(@charDate,7,2)+':'
                    +SUBSTRING(@charDate,9,2)+':'+SUBSTRING(@charDate,11,2)
                ,121) AT TIME ZONE '{3}',0);
    END
    TRY BEGIN CATCH
        SET @utcDate=SysUtcDateTime();
    END CATCH;
    BEGIN
        TRY UPDATE {0} SET {2}=@utcDate WHERE CURRENT OF date_cursor;
    END TRY
    BEGIN CATCH END CATCH;
    FETCH NEXT FROM date_cursor INTO @decimalDate;
END;
CLOSE date_cursor;
DEALLOCATE date_cursor;

也有例外。 例如，“創建過程”語句必須是塊的第一條語句。 但是大多數DML可以像這樣被批處理。

Answer 2

您可以這樣寫：

SqlCommand cmd = new SqlCommand
{
    CommandType = CommandType.Text,
    CommandText = $"DELETE FROM cbu_naslovi WHERE [ID]='{CurrentID}';DELETE FROM cbu_deli WHERE [IDX]='{CurrentID}'",
    Connection = con
};

Answer 3

如果您需要運行“非查詢”操作，則可以嘗試使用Server對象執行一堆命令。 好處：您可以在SQL語句中使用GO 。 Command不允許使用GO 。

server.ConnectionContext.ExecuteNonQuery("your SQL statement -- could be 100 statements with hundrends of GO commands", ExecutionTypes.Default)

服務器變量的類型為Server