CREATE PROCEDURE addtable
(@name nvarchar(64) , --是一个要组成新表名的名称
@guid uniqueidentifier,
@nguid uniqueidentifier, --表中的字段
@ID nvarchar(64),
@data xml
)
declare @n int
declare @m int
declare @a nvarchar(1000),@b nvarchar(1000)
declare @tablename nvarchar(200)
set @tablename=( 'table '+@name)--关键是表的名称 要声明表变量 要是能声明是最好不过了
set @n=0
set @m=0
set @a='select @n=count(*) from '+@tablename+' where guid=''' +@guid+''''
set @b='select @m=count(*) from '+@tablename+' where nguid=@nguid and id=' +rtrim(@id)exec sp_executesql @a,N'@n int output',@n output exec sp_executesql @b,N'@m int output',@n output
if @n=0 or @m=0
exec 'insert into '+@tablename+'
(guid,nguid,id,data,) values ('''+@guid+''','''+@ngui+''','+rtrim(@id)+','''+@data+''')')
if @n!=0 or @m!=0
begin
raiserror( 'the data exis ',16,1)
end
(@name nvarchar(64) , --是一个要组成新表名的名称
@guid uniqueidentifier,
@nguid uniqueidentifier, --表中的字段
@ID nvarchar(64),
@data xml
)
declare @n int
declare @m int
declare @a nvarchar(1000),@b nvarchar(1000)
declare @tablename nvarchar(200)
set @tablename=( 'table '+@name)--关键是表的名称 要声明表变量 要是能声明是最好不过了
set @n=0
set @m=0
set @a='select @n=count(*) from '+@tablename+' where guid=''' +@guid+''''
set @b='select @m=count(*) from '+@tablename+' where nguid=@nguid and id=' +rtrim(@id)exec sp_executesql @a,N'@n int output',@n output exec sp_executesql @b,N'@m int output',@n output
if @n=0 or @m=0
exec 'insert into '+@tablename+'
(guid,nguid,id,data,) values ('''+@guid+''','''+@ngui+''','+rtrim(@id)+','''+@data+''')')
if @n!=0 or @m!=0
begin
raiserror( 'the data exis ',16,1)
end
exec sp_executesql @b,N'@m int output',@m output--改一下这里@m
--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
--------------------------------------------------------------------------------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
set @n=(select count(*) from @tablename where guid=@guid)
set @m=(select count(*) from @tablename where nguid=@nguid and id=@id) 这两句改成
declare @sql nvarchar(4000)
set @sql='select @n=count(*) from '+@tablename+' where guid='''+ltrim(@guid)+''';select
@m=count(*) from '+@tablename+' where nguid='''+ltrim(@nguid)+''' and id='''+@id+''''
exec sp_executesql @sql,N'@n int output,@m int output',@n output,@m output
不允许从数据类型 xml 到 nvarchar 的隐式转换。请使用 CONVERT 函数来运行此查询。