declare @SQL varchar(1000)
set @sql='select xx from table where ' +@xx
exec (@sql)
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set @sql='select xx from table where ' +@xx
exec (@sql)
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主营:中小企业数据库管理、优化、调校服务
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@WHERE VARCHAR(50)
AS
EXEC('SELECT * FROM TB WHERE '+@WHERE)
set @sql_where = 'where 1=1 +'
...
@var varchar(50)
as
begin
declare @sql varchar(1000)
set @sql='select xx from table where 1=1 ' +@var
exec (@sql)
create proc proc_GetResult
@XX nvarchar(max)
as
begin
declare @sql nvarchar(max)
set @sql='select xx from table where 1=1 ' +@XX
exec (@sql)
end
---where 1 = 1 是为了防止你传入参数为空时的语法错误
CREATE PROC p_test
@para1 varchar(10)=null,
@para2 varchar(10)=null,
@para3 varchar(10)=null,
@para4 varchar(10)=null
AS
SET NOCOUNT ON
DECLARE @sql varchar(8000)
SET @sql='SELECT * FROM tbname WHERE 1=1'
IF @para1 IS NOT NULL
SET @sql=@sql+' AND col1='''+@para1+''''
IF @para2 IS NOT NULL
SET @sql=@sql+' AND col2='''+@para2+''''
IF @para3 IS NOT NULL
SET @sql=@sql+' AND col3='''+@para3+''''
IF @para4 IS NOT NULL
SET @sql=@sql+' AND col4='''+@para4+''''
EXEC(@sql)
GO
/*======================================================*/--2. 使用 sp_executesql 实现的动态参数存储过程
CREATE PROC p_test
@para1 varchar(10)=null,
@para2 datetime=null,
@para3 varchar(10)=null,
@para4 int=null
AS
SET NOCOUNT ON
DECLARE @sql nvarchar(4000)
SET @sql='SELECT * FROM tbname WHERE 1=1'
+CASE WHEN @para1 IS NULL THEN '' ELSE ' AND col1=@para1' END
+CASE WHEN @para2 IS NULL THEN '' ELSE ' AND col2=@para2' END
+CASE WHEN @para3 IS NULL THEN '' ELSE ' AND col3=@para3' END
+CASE WHEN @para4 IS NULL THEN '' ELSE ' AND col4=@para4' END
EXEC sp_executesql @sql,N'
@para1 varchar(10)=null,
@para2 datetime=null,
@para3 varchar(10)=null,
@para4 int=null
',@para1,@para2,@para3,@para4
GO
/*======================================================*/--3. 不使用动态 Transact-SQL 语句实现的动态参数存储过程
CREATE PROC p_test
@para1 varchar(10)=null,
@para2 datetime=null,
@para3 varchar(10)=null,
@para4 int=null
AS
SET NOCOUNT ON
SELECT * FROM tbname
WHERE (@para1 IS NULL OR col1=@para1)
AND (@para2 IS NULL OR col2=@para2)
AND (@para3 IS NULL OR col3=@para3)
AND (@para4 IS NULL OR col4=@para4)
(
@WHERE VARCHAR(50)
)AS
EXEC('SELECT * FROM TB WHERE ='+@WHERE)
(
@WHERE VARCHAR(50)
)AS
EXEC('SELECT * FROM TB WHERE 1=1 '+@WHERE)要这样
declare @xx
declare @a
set @xx='xx=aa and hh=qq'
set @a='select xx from table where 'set @a=@a+@xx
exec(@a)
declare @xx varchar(100)
declare @a varchar(100)
set @xx='xx=aa and hh=qq'
set @a='select xx from table where ' set @a=@a+@xx
exec(@a)