Question

有没有办法通过SQL中的while循环创建过程列表？

我试图做的是这样的事情，但是有一个更大的属性表。

Declare @attributes Table (attrkey text, attr_key text)
  Insert @attributes(attrkey, attr_key) values('userFirstName',  'user_first_name')
  Insert @attributes(attrkey, attr_key) values('userFamilyName', 'user_family_name')
  Insert @attributes(attrkey, attr_key) values('userNameExtra',  'user_name_extra')

Declare @attrkey nvarchar(128)
Declare @attr_key nvarchar(128)
Declare @proc_name_set nvarchar(128)
Declare @proc_name_del nvarchar(128)


While exists (Select * From @attributes)
  Begin
    Select @attrkey = attrkey, @attr_key = attr_key from @attributes
    Set @proc_name_set = 'set_web_user_' + @attr_key
    Set @proc_name_del = 'del_web_user_' + @attr_key

    CREATE PROCEDURE [dbo].[@proc_name_set] @keyval int, @value nvarchar(255)  AS
    UPDATE web_user SET @attrkey=@value WHERE id=@keyval;
    Go
    CREATE PROCEDURE [dbo].[@proc_name_del] @keyval int, @value nvarchar(255)  AS
    UPDATE web_user SET @attrkey=NULL WHERE id=@keyval AND @attrkey=@value;
    Go

    Delete from @attributes where attrkey like @attrkey
  End

Answer 1

虽然可能有更好的方法可以做到这一点，但我猜这可能是一次性操作，性能可能并不重要。如果是这样，则此修改后的代码应该可以工作，并为所有属性创建set_web_user_和del_web_user_过程：

Declare @attributes Table (attrkey text, attr_key text)
Insert @attributes(attrkey, attr_key) values('userFirstName',  'user_first_name')
Insert @attributes(attrkey, attr_key) values('userFamilyName', 'user_family_name')
Insert @attributes(attrkey, attr_key) values('userNameExtra',  'user_name_extra')

Declare @attrkey nvarchar(128)
Declare @attr_key nvarchar(128)
Declare @proc_name_set nvarchar(128)
Declare @proc_name_del nvarchar(128)
Declare @proc_text nvarchar(max)

While exists (Select * From @attributes)
  Begin
    Select @attrkey = attrkey, @attr_key = attr_key from @attributes
    Set @proc_name_set = 'set_web_user_' + @attr_key
    Set @proc_name_del = 'del_web_user_' + @attr_key

    Set @proc_text = N'CREATE PROCEDURE [dbo].[' + @proc_name_set + '] @keyval int, @value nvarchar(255)  AS
    UPDATE web_user SET ' + @attrkey + ' = @value WHERE id = @keyval;'

    EXEC sp_executesql @proc_text

    Set @proc_text = N'CREATE PROCEDURE [dbo].[' + @proc_name_del + '] @keyval int, @value nvarchar(255)  AS
    UPDATE web_user SET ' + @attrkey + ' = NULL WHERE id = @keyval AND ' + @attrkey + ' = @value;'

    EXEC sp_executesql @proc_text

    Delete from @attributes where attrkey like @attrkey
  End

使用procedure-name作为变量在while循环中创建SQL过程

1 个答案: