[英]Pass parameter to sql trigger by asp.net
Asking a very noob question. 问一个非常菜鸟的问题。 I actually want to trace my database when any user is insert update and delete record recently.
我实际上想跟踪最近有任何用户插入更新和删除记录时的数据库。
I created trigger in order to trace any database changes. 我创建触发器是为了跟踪任何数据库更改。
Here is my sql trigger 这是我的SQL触发器
USE [test]
GO
/****** Object: Trigger [dbo].[tr_trigtest1] Script Date: 09/05/2012 16:31:18 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER TRIGGER [dbo].[tr_trigtest1] ON [dbo].[test1] FOR INSERT, UPDATE, DELETE
AS
DECLARE @bit INT ,
@field INT ,
@maxfield INT ,
@char INT ,
@fieldname VARCHAR(128) ,
@TableName VARCHAR(128) ,
@PKCols VARCHAR(1000) ,
@sql VARCHAR(2000),
@UpdateDate VARCHAR(21) ,
@UserName VARCHAR(128) ,
@Type CHAR(1) ,
@PKSelect VARCHAR(1000)
--You will need to change @TableName to match the table to be audited
SELECT @TableName = 'trigtest'
-- date and user
SELECT @UserName = @UserName ,
@UpdateDate = CONVERT(VARCHAR(8), GETDATE(), 112)
+ ' ' + CONVERT(VARCHAR(12), GETDATE(), 114)
-- Action
IF EXISTS (SELECT * FROM inserted)
IF EXISTS (SELECT * FROM deleted)
SELECT @Type = 'U'
ELSE
SELECT @Type = 'I'
ELSE
SELECT @Type = 'D'
-- get list of columns
SELECT * INTO #ins FROM inserted
SELECT * INTO #del FROM deleted
-- Get primary key columns for full outer join
SELECT @PKCols = COALESCE(@PKCols + ' and', ' on')
+ ' i.' + c.COLUMN_NAME + ' = d.' + c.COLUMN_NAME
FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS pk ,
INFORMATION_SCHEMA.KEY_COLUMN_USAGE c
WHERE pk.TABLE_NAME = @TableName
AND CONSTRAINT_TYPE = 'PRIMARY KEY'
AND c.TABLE_NAME = pk.TABLE_NAME
AND c.CONSTRAINT_NAME = pk.CONSTRAINT_NAME
-- Get primary key select for insert
SELECT @PKSelect = COALESCE(@PKSelect+'+','')
+ '''<' + COLUMN_NAME
+ '=''+convert(varchar(100),
coalesce(i.' + COLUMN_NAME +',d.' + COLUMN_NAME + '))+''>'''
FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS pk ,
INFORMATION_SCHEMA.KEY_COLUMN_USAGE c
WHERE pk.TABLE_NAME = @TableName
AND CONSTRAINT_TYPE = 'PRIMARY KEY'
AND c.TABLE_NAME = pk.TABLE_NAME
AND c.CONSTRAINT_NAME = pk.CONSTRAINT_NAME
IF @PKCols IS NULL
BEGIN
RAISERROR('no PK on table %s', 16, -1, @TableName)
RETURN
END
SELECT @field = 0,
@maxfield = MAX(ORDINAL_POSITION)
FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = @TableName
WHILE @field < @maxfield
BEGIN
SELECT @field = MIN(ORDINAL_POSITION)
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = @TableName
AND ORDINAL_POSITION > @field
SELECT @bit = (@field - 1 )% 8 + 1
SELECT @bit = POWER(2,@bit - 1)
SELECT @char = ((@field - 1) / 8) + 1
IF SUBSTRING(COLUMNS_UPDATED(),@char, 1) & @bit > 0
OR @Type IN ('I','D')
BEGIN
SELECT @fieldname = COLUMN_NAME
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = @TableName
AND ORDINAL_POSITION = @field
SELECT @sql = '
insert Audit ( Type,
TableName,
PK,
FieldName,
OldValue,
NewValue,
UpdateDate,
UserName)
select ''' + @Type + ''','''
+ @TableName + ''',' + @PKSelect
+ ',''' + @fieldname + ''''
+ ',convert(varchar(1000),d.' + @fieldname + ')'
+ ',convert(varchar(1000),i.' + @fieldname + ')'
+ ',''' + @UpdateDate + ''''
+ ',''' + @UserName + ''''
+ ' from #ins i full outer join #del d'
+ @PKCols
+ ' where i.' + @fieldname + ' <> d.' + @fieldname
+ ' or (i.' + @fieldname + ' is null and d.'
+ @fieldname
+ ' is not null)'
+ ' or (i.' + @fieldname + ' is not null and d.'
+ @fieldname
+ ' is null)'
EXEC (@sql)
END
END
Everything is smooth, I will get those detail when any record is update, insert and delete 一切都很顺利,任何记录被更新,插入和删除时,我都会得到这些细节
My coding 我的编码
public partial class WebForm1 : System.Web.UI.Page
{
private testEntities entity = new testEntities();
protected void Page_Load(object sender, EventArgs e)
{
trigtest test = trigtest.Createtrigtest(10, 12);
entity.AddTotrigtests(test);
entity.SaveChanges();
}
}
So now I got a problem. 所以现在我有一个问题。 It it possible to pass value to @username by backend code?How to modify the trigger?Sorry I still very fresh for sql trigger .
可以通过后端代码将值传递给@username吗?如何修改触发器?对不起,我对于sql trigger还是很新鲜的。 I dunno how to modify it
我不知道如何修改它
The UserName is returned by the function SUser_SName()
用户名由函数
SUser_SName()
返回。
SELECT @UserName = SUser_SName();
What value that actually returns depends on your EF connection string. 实际返回的值取决于您的EF连接字符串。
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