服务器: 消息 137,级别 15,状态 2,过程 show_taiwanall,行 21
必须声明变量 '@i'。Create procedure show_taiwanall
(
@string VARCHAR(20)
)
AS
BEGIN
declare @j VARCHAR(20)
DECLARE @i VARCHAR(20)
DECLARE @x int
set @x=1
print @string
IF (@string IS NULL) OR (LTRIM(@string) = '')
RETURN
set @j=@string
WHILE right(@j,6) <=200712
BEGIN
set @i='RB'+LTRIM(str(@j))
print @i
INSERT INTO abctww(no,weeks,kqrq,sksj) select no,weeks,kqrq,sksj from @i where bmmc like '%台%'
set @j= @j + 1
end
END
exec ('select * from ' + @i + ' where ...')
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
Create procedure show_taiwanall
(
@string VARCHAR(20)
)
AS
BEGIN
declare @j VARCHAR(20)
DECLARE @i VARCHAR(20)
DECLARE @x int
set @x=1
print @string
IF (@string IS NULL) OR (LTRIM(@string) = '')
RETURN
set @j=@string
WHILE right(@j,6) <=200712
BEGIN
set @i='RB'+LTRIM(str(@j))
print @i
exec('INSERT INTO abctww(no,weeks,kqrq,sksj)
select no,weeks,kqrq,sksj from '+ @i +' where bmmc like ''%台%'' ')
set @j= @j + 1
end
END
INSERT INTO a (no,kqrq,jzno,qjxs) VALUES (@object_no,@object_kqrq,@object_jzno,@object_qjxs)
--
要用动态 SQL
INSERT INTO a (no,kqrq,jzno,qjxs) VALUES (@object_no,@object_kqrq,@object_jzno,@object_qjxs)