存储过程动态SQL的方式

IF(OBJECT_ID('tempdb..#Books') IS NOT NULL)

BEGIN

DROP TABLE #Books;

END

CREATE TABLE #Books

(

BookName NVARCHAR(20),

BookCode NVARCHAR(20)

)

INSERT INTO #Books( BookName, BookCode ) VALUES(N'C# 本质论','JC556874');

INSERT INTO #Books( BookName, BookCode ) VALUES(N'JS 本质论','JS556874');

第一种方式

DECLARE @paraBookName NVARCHAR(20);

SET @paraBookName='C';

DECLARE @Query NVARCHAR(2000);

SET @Query='';

SET @Query=@Query+'SELECT * FROM #Books WHERE 1=1 ';

IF(@paraBookName IS NOT NULL AND @paraBookName<>'')

BEGIN

SET @Query=@Query+'AND BookName LIKE ''%'+@paraBookName+'%'' ';

END

EXEC(@Query);

第二种方式

DECLARE @paraBookName NVARCHAR(20);

SET @paraBookName='C';

SELECT * FROM #Books WHERE 1=1

AND (@paraBookName IS NULL OR @paraBookName='' OR BookName LIKE '%'+@paraBookName+'%')