Question

您好我想要计算下面脚本中受影响的行数

BEGIN TRANSACTION;
BEGIN TRY
USE db1
PRINT 'DELETING STUFF'

DELETE FROM oc WHERE a_col LIKE 'G' AND b_col LIKE '11' AND c_col LIKE 'P' AND d_col LIKE 'N'
DELETE FROM oc WHERE a_col LIKE 'Z' AND b_col LIKE '1' AND c_col LIKE 'R' AND d_col LIKE 'G'

PRINT 'SCRIPT RETURNED 0 ERRORS'
END TRY
BEGIN CATCH
PRINT 'ERROR OCCURED WHILE DELETING, CHECK BELOW ERROR MESSAGE'
PRINT ERROR_MESSAGE()
END CATCH 
ROLLBACK TRANSACTION;

它总是返回

（1行受影响）

对于每个删除语句，我正在寻找受影响的行数。无论如何要做到这一点？

Answer 1

使用@@ROWCOUNT：

DECLARE @num1 int;
DECLARE @num2 int;

DELETE FROM oc
    WHERE a_col LIKE 'G' AND b_col LIKE '11' AND c_col LIKE 'P' AND d_col LIKE 'N';

SET @num1 = @@ROWCOUNT;

DELETE FROM oc WHERE a_col LIKE 'Z' AND b_col LIKE '1' AND c_col LIKE 'R' AND d_col LIKE 'G';

SET @num2 = @@ROWCOUNT;

Answer 2

实际上，您的代码可以简化为单个删除语句：

@@ROWCOUNT

然后，您不需要显式交易，您可以直接从cats获取受影响的行数。

Answer 3

您还可以查看 OUTPUT 条款，该条款可以返回与 @@ROWCOUNT

类似的已删除行

DELETE FROM oc 
OUTPUT DELETED.*
WHERE (a_col = 'G' AND b_col = '11' AND c_col = 'P' AND d_col = 'N') OR
      (a_col = 'Z' AND b_col = '1' AND c_col = 'R' AND d_col = 'G')

计算受多个DELETE影响的行

3 个答案: