导读:1建站知识有一个表，用户需要在后台操作它，希望能对它动态进行添加删除字段网站建设哪家好网站seo优化诊断工具。

有一个表，用户需要在后台操作它，希望能对它动态进行添加删除字段。这个功能也许没有问题，但是它原有插入与更新的两个存储过程，也需要一起修改。因此Insus.NET实现了它，因此此文会让你了解到怎样动态为一个表添加删除字段以及动态修改它的存储过程 首先需要建一个表[A]，这个表只有两个字段，一个是[ID]自动增长,另一个是表[B]的字段名，存储的每一笔记录，即是用户需要操作的表[B]的字段。这个表[A]需要建添加，更新，以及删除的存储过程，方便用户在后台方便操作，还有重点部分，需要写触发器。如有记录对表[A]进行添加，更新或是删除时，它会触发去作表[B]相应操作，还要去修改表[B]的存储过程。 动态修改表[B]的存储过程：

复制代码 代码如下:

CREATE PROCEDURE [dbo].[usp_B_DymanicallyAlterStoreProcedure] AS DECLARE @VariableList NVARCHAR(MAX) = '' DECLARE @FieldList NVARCHAR(MAX) = '' DECLARE @ValueList NVARCHAR(MAX) = '' DECLARE @FieldValueList NVARCHAR(MAX) = '' DECLARE @I INT = 1, @R INT = 0 SET @R = (SELECT MAX([Id]) FROM [dbo].[A]) WHILE (@I <= @R) BEGIN DECLARE @fName NVARCHAR(100) IF EXISTS(SELECT [Id] FROM [dbo].[A] WHERE [Id] = @I) BEGIN SELECT @fName = [FieldName] FROM [dbo].[A] WHERE [Id] = @I SET @VariableList = @VariableList + ',@' + @fName +' DECIMAL(18,4)' --动态的字段数据类型都一样 SET @FieldList = @FieldList + ',[' + @fName + ']' SET @ValueList = @ValueList + ',@' + @fName SET @FieldValueList = @FieldValueList + ',[' + @fName + '] = @' + @fName END SET @I = @I + 1 END DECLARE @sql_I NVARCHARseo网站优化(MAX),@sql_U NVARCHAR(MAX) SET @sql_I = ' ALTER PROCEDURE [dbo].[usp_B_Insert] ( @ItemCode NVARCHAR(50) '+ @VariableList +' ) AS INSERT INTO [dbo].[B] ([ItemCode]'+ @FieldList +') VALUES (@ItemCode'+ @ValueList +') ' EXECUTE sp_EXECUTESQL @sql_I; SET @sql_U = ' ALTER PROCEDURE [dbo].[usp_B_Update] ( @Id INT, @ItemCode NVARCHAR(50) '+ @VariableList +' ) AS UPDATE [dbo].[B] SET [ItemCode] = @ItemCode'+ @FieldValueList +' WHERE [Id] = @Id ' EXECUTE sp_EXECUTESQL @sql_U;

复制代码 代码如下:

CREATE TRIGGER [dbo].[tri_A_Insert] ON [dbo].[A] FOR INSERT AS BEGIN SET NOCOUNT ON DECLARE @FieldName NVARCHAR(50) SELECT @FieldName = [FieldName] FROM INSERTED EXECUTE('IF NOT EXISTS(SELECT * FROM SYSCOLUMNS WHERE [id] = OBJECT_ID(''B'') AND [name] = '''+ @FieldName +''') ALTER TABLE [B] ADD ['+ @FieldName +'] DECIMAL(18,4) NULL') EXECUTE [dbo].[usp_B_DymanicallyAlterStoreProcedure]; END

复制代码 代码如下:

CREATE TRIGGER [dbo].[tri_A_Delete] ON [dbo].[A] FOR DELETE AS BEGIN SET NOCOUNT ON DECLARE @FieldName NVARCHAR(50) SELECT @FieldName = [FieldName] FROM DELETED EXECUTE('IF EXISTS(SELECT * FROM SYSCOLUMNS WHERE [id] = OBJECT_ID(''seo网站关键词优化B'') AND [name] = '''+ @FieldName +''') ALTER TABLE [B] DROP COLUMN ['+ @Fiel建设网站公司dName +']') EXECUTE [dbo].[usp_B_DymanicallyAlterStoreProcedure]; END

关键词标签: 字段 它的