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declare @s varchar(50)
set @s='''01'',''17'',''19'''
declare @str varchar(100)
set @str='select * from gzda where 部门 in (' + @s + ')'
exec (@str)
if object_id('tb') is not null
drop table tb
create table tb (id varchar(10))
insert into tb values('aa')
insert into tb values('bb')
insert into tb values('cc')
insert into tb values('dd')
insert into tb values('ee')
declare @s as varchar(50)
declare @s1 as varchar(50)
declare @s2 as varchar(50)
set @s = 'aa'
set @s2 = 'bb'
set @s1 = 'cc'
select @s,@s2,@S1
Execute my_proce1 @s,@s1,@s2
go
if object_id('tb') is not null
drop procedure my_proce1
create procedure my_proce1
@str varchar(50),
@str1 varchar(50),
@str2 varchar(50)
as
begin
exec('select * from tb where id in ('''+ @str +''',''' + @str1 + ''',''' + @str2 + ''')')
end
--结果
aa
bb
cc
if object_id('tb') is not null
drop table tb
create table tb (id varchar(10))
insert into tb values('1')
insert into tb values('2')
insert into tb values('3')
insert into tb values('4')
insert into tb values('5')
go
--查询原始数据
select * from tb
/*
id
----------
aa
bb
cc
dd
ee
(5 行受影响)
*/
go
if object_id('my_proce') is not null
drop proc my_proce
create procedure my_proce @str varchar(50)
as
begin
exec('select * from tb where id in (''' + @str + ''')')
end
go
declare @s as varchar(50)
set @s = '1'',''2'',''3'
--执行存储过程查询数据
EXECUTE my_proce @s
/*
id
----------
1
2
3
(3 行受影响)
*/
drop table tb
drop procedure my_proce
declare @aa nvarchar(100)
set @aa='1,2,3'
exec('select [ID] from table1 where [id] in ('+@aa+')'
动态sql语句基本语法
1 :普通SQL语句可以用Exec执行
eg: Select * from tableName
Exec('select * from tableName')
Exec sp_executesql N'select * from tableName' -- 请注意字符串前一定要加N
2:字段名,表名,数据库名之类作为变量时,必须用动态SQL
eg:
declare @fname varchar(20)
set @fname = 'FiledName'
Select @fname from tableName -- 错误,不会提示错误,但结果为固定值FiledName,并非所要。
Exec('select ' + @fname + ' from tableName') -- 请注意 加号前后的 单引号的边上加空格
当然将字符串改成变量的形式也可
declare @fname varchar(20)
set @fname = 'FiledName' --设置字段名
declare @s varchar(1000)
set @s = 'select ' + @fname + ' from tableName'
Exec(@s) -- 成功
exec sp_executesql @s -- 此句会报错
declare @s Nvarchar(1000) -- 注意此处改为nvarchar(1000)
set @s = 'select ' + @fname + ' from tableName'
Exec(@s) -- 成功
exec sp_executesql @s -- 此句正确
3. 输出参数
declare @num int,
@sqls nvarchar(4000)
set @sqls='select count(*) from tableName'
exec(@sqls)
--如何将exec执行结果放入变量中?
declare @num int,
@sqls nvarchar(4000)
set @sqls='select @a=count(*) from tableName '
exec sp_executesql @sqls,N'@a int output',@num output
select @num
declare sqlStr varchar (1000)
declare sqlWhere varchar(1000)
set sqlWhere='1,2,3'
set sqlStr='select ID FROM table1 where id in('+sqlWhere+')'
exec(sqlStr)