Skip to main content

Database changes with Audit Table


In Recent I faced the problem whenever we need to move the DB Changes to Production environment we have some table in the Development environment .we have added some columns to table in Development. we need to change definitions in production environment also .At this time we are some little bit of problem facing . Today I come up with the solution we need to create the DDL trigger on Database level. Whenever we are moving the DB Changes to Production environment we can cross check audit table.  

--Create Student Table
create table Student
(             
                id int identity(1,1) ,
                Name varchar(100)
)

--Create Audit Table
 create table Audit
 (
 EventType nvarchar(max),
 Command nvarchar(max),
 Createdon datetime
 )
--Create DDL Trigger on Database
create  trigger AuditDBChanges
on database
for create_table,alter_table,drop_table
as
begin
 DECLARE
@EventData XML = EVENTDATA();
insert into Audit (EventType,Command,Createdon)
select     @EventData.value('(/EVENT_INSTANCE/EventType)[1]',   'NVARCHAR(100)'),
 @EventData.value('(/EVENT_INSTANCE/TSQLCommand)[1]', 'NVARCHAR(MAX)'),
  getdate()
end

--Add Marks column to Student Table
alter table Student add Marks int

-- drop table
drop table Student

--Check the Adit Information
 select * from Audit


-- Disable trigger from Databse
disable trigger AuditDBChanges on database

--Enable trigger from Databse
Enable trigger AuditDBChanges on database

--Drop trigger from Databse
drop trigger AuditDBChanges on database

--For more information about trigger event types
 select * from sys.trigger_event_types


Labels:

Comments

Post a Comment

Popular posts from this blog

Coalesce function

Coalesce function returns the first non-null value among the arguments. Syntax: Coalesce (expression [,..n]) Here is example using Coalesce function Example 1 DECLARE @Str1 varchar ( 10 ), @str2 varchar ( 20 ), @Str3 varchar ( 20 ) SET @Str2 = 'Sql' , @Str3 = 'Server' SELECT COALESCE ( @Str1 , @str2 , @Str3 ) As [Coalesce] In above example @Str2 value is ‘Sql’ , @str3 value is ‘Server’  and @str1 values is Null because it not assigned any value . Output: It return’s “Sql” because Coalesce function return’s first non null value. Example 2: Coalesce in select statement. IF OBJECT_ID ( 'Employee' , 'U' ) IS NOT NULL DROP TABLE Employee CREATE TABLE Employee (   ID INT IDENTITY ( 1 , 1 ) PRIMARY KEY ,   NAME VARCHAR ( 20 ),   SALARY INT ) INSERT INTO Employee   ( NAME , SALARY ) VALUES ( 'Rakesh' , 5000 ),(NULL, 6000 ),( 'Naresh...
1 comment
Read more

IDENTITY COLUMNS

Identity column specifies when ever new value is inserted into table. Identity column automatically inserted value into column. Identity Column can be specified at the time of creation of table. CREATE TABLE Employee (  EMPID INT IDENTITY ( 1 , 1 ),  EMPNAME VARCHAR ( 50 ),  SALARY INT ) In above table creation script EMPID column specifies IDENTITY property i.e., whenever a new row inserted into a Employee table EMPID Column will automatically value is inserted. INSERT INTO Employee ( EMPNAME , SALARY ) VALUES ( 'RAKESH' , 7000 ) INSERT INTO Employee ( EMPNAME , SALARY ) VALUES ( 'ALI' , 12000 ) SELECT * FROM Employee When u run above select statement is the following result is if u are trying insert value into identify columns .it will give error. INSERT INTO Employee ( EMPID , EMPNAME , SALARY ) VALUES ( 1 , 'RAKESH' , 7000 ) Msg 5...
Post a Comment
Read more