Question

在下面，如果我尝试在BEGIN语句之后放置一个打印它不起作用，当我删除BEGIN-END语句中的所有内容并放置一个打印它确实有效;

SET @SQL = 'IF (((SELECT fldLT FROM #zArray) = ''p'') OR ((SELECT fldMF FROM #zArray) <> -1))
            BEGIN
                SET @X = '+@Z+' * ((SELECT fldLF FROM #zArray) / 100))

                IF (CAST((SELECT fldMF FROM #zArray) AS FLOAT) > '+@X+')
                    BEGIN
                        SET @X = (CAST((SELECT fldMF FROM #zArray) AS FLOAT))
                    END                         
                END'   

EXEC sp_executesql @SQL, N'@X NVARCHAR(50),@Z NVARCHAR(50)', @X, @Z

以下代码是否有问题导致print语句不起作用？

    'SET @X = '+@Z+' * ((SELECT fldLF FROM #zArray) / 100))

                IF (CAST((SELECT fldMF FROM #zArray) AS FLOAT) > '+@X+')
                    BEGIN
                        SET @X = (CAST((SELECT fldMF FROM #zArray) AS FLOAT))
END'

Answer 1

我不明白为什么你要连接你的参数而你又在sp_executesql的程序中再次使用它们。

我修改了一些查询，删除了参数的串联并使用REPLACE函数，用您的参数替换占位符：

DECLARE @X NVARCHAR(50) = '123'
DECLARE  @Z NVARCHAR(50) = '123'
DECLARE @SQL NVARCHAR(MAX)

SET @SQL = 'IF (((SELECT fldLT FROM #zArray) = ''p'') OR ((SELECT fldMF FROM #zArray) <> -1))
            BEGIN
                SET @paramX = @paramZ * ((SELECT fldLF FROM #zArray) / 100))

                IF (CAST((SELECT fldMF FROM #zArray) AS FLOAT) > @paramX)
                    BEGIN
                        SET @paramX = (CAST((SELECT fldMF FROM #zArray) AS FLOAT))
                    END                         
                END'   

SET @SQL = REPLACE(@SQL,'@paramX',@X)
SET @SQL = REPLACE(@SQL,'@paramZ',@Z)

PRINT @SQL

EXEC sp_executesql @SQL

对我来说，PRINT声明工作正常。

Answer 2

您需要将SQL语句作为字符串传递，而不是在动态sql中使用的变量

DECLARE @Xr NVARCHAR(50) = '1000351' DECLARE  @Zr NVARCHAR(50) = '46546321'
DECLARE @SQL NVARCHAR(MAX)
SET @SQL = 'IF (((SELECT fldLT FROM #zArray) = ''p'') OR ((SELECT fldMF FROM #zArray) <> -1))
            BEGIN
                SET @X = @Z * ((SELECT fldLF FROM #zArray) / 100))

                IF (CAST((SELECT fldMF FROM #zArray) AS FLOAT) > @X)
                    BEGIN
                        SET @X = (CAST((SELECT fldMF FROM #zArray) AS FLOAT))
                    END                         
                END '   
PRINT @SQL
EXEC sp_executesql @SQL, 
                    N'@X NVARCHAR(50),@Z NVARCHAR(50)', 
                    @X = @Xr, 
                    @Z = @Zr

打印结果

IF (((SELECT fldLT FROM #zArray) = 'p') OR ((SELECT fldMF FROM #zArray) <> -1))
            BEGIN
                SET @X = 46546321 * ((SELECT fldLF FROM #zArray) / 100))

                IF (CAST((SELECT fldMF FROM #zArray) AS FLOAT) > 1000351)
                    BEGIN
                        SET @X = (CAST((SELECT fldMF FROM #zArray) AS FLOAT))
                    END                         
                END

SQL PRINT在某些实例中不起作用

2 个答案: