这篇文章主要为大家详细介绍了SQL Server 动态给表添加删除字段并同时修改它的插入更新存储过程,具有一定的参考价值,可以用来参考一下。
感兴趣的小伙伴,下面一起跟随四海网的小编两巴掌来看看吧!
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 NVARCHAR(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;
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
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(''B'') AND [name] = '''+ @FieldName +''')
ALTER TABLE [B] DROP COLUMN ['+ @FieldName +']')
EXECUTE [dbo].[usp_B_DymanicallyAlterStoreProcedure];
END
本文来自:http://www.q1010.com/179/7982-0.html
注:关于SQL Server 动态给表添加删除字段并同时修改它的插入更新存储过程的内容就先介绍到这里,更多相关文章的可以留意四海网的其他信息。
关键词:SQL SERVER
四海网收集整理一些常用的php代码,JS代码,数据库mysql等技术文章。