Today, I will be looking at how INSTEAD OF TRIGGERS can be used to make our VIEW correctly work with a UPDATE statement. I will be using the [AUTOS] sample database for this demonstration. The [VW_JOIN_MAKES_2_MODELS] view will be enhanced with a instead of trigger so that update action can be perform on two tables at the same time. The enclosed script has code to perform the following actions in the AUTOS database. 5A – Remove aggregate view 5B – Reload tables with good data 5C – Create a instead…
Tag: create trigger
Instead of Delete
Today, I will be looking at how INSTEAD OF TRIGGERS can be used to make our VIEW correctly work with a DELETE statement. I will be using the [AUTOS] sample database for this demonstration. The [VW_JOIN_MAKES_2_MODELS] view will be enhanced with a instead of trigger so that delete action can be perform on two tables at the same time. The enclosed script has code to perform the following actions in the AUTOS database. 5A – Remove aggregate view 5B – Reload tables with good data 5C – Create a instead…
Instead of Insert
Most information technology professionals do not know that data can be modified via a VIEW. The INSERT, UPDATE, and DELETE statements of the Data Manipulation Language (DML) can be executed on a view as long as the following set of rules are adhered to. Modifications must reference columns from only one base table. The columns must directly reference the underlying data table. I am going to continue my exploration of updatable views. Last time, we were using the [AUTOS] sample database and discovered that DELETE statements were not working the…
Database Files & Objects – Part 1
I am currently reading Kalen Delany and others book on SQL Server 2008 System internals. If you have not read this book from cover to cover, you should. It has a wealth of knowledge about database engine details. To demonstrate key ideas from the book, I am going to expand on the [MATH] database that contains PRIME numbers. The trial division algorithm inside this database uses a brute force method for calculating prime numbers. This article will focus on files and objects that can be viewed through the system views,…
Various Triggers – Part 6
Triggers can be used to track Data Manipulation Language (DML) changes that occur in tables. Today, I am going to expand the AUTOS database script to add table auditing. Auditing is a very good practice when multiple people have rights to make changes to important semi-static data. This is not a good solution if the amount of data is large or number of table changes are huge. First, I am going to leverage the newly built schema called Audit Database Tracking (ADT) to seperate data tables from audit tables. A…
Various Triggers – Part 5
Another usage of Database Triggers is track Data Definition Language (DDL) changes that occur in a database. Today, I am going to enhance the AUTOS database script to add such auditing. This auditing is a very good practice when multiple people have syadmin rights to make such changes. First, I am going to create a schema called Audit Database Tracking (ADT) to seperate the data tables from audit tracking tables.
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<span style="color: #008000; font-size:small;">-- Delete existing schema. IF EXISTS (SELECT * FROM sys.schemas WHERE name = N'ADT') DROP SCHEMA [ADT]; GO -- Create a ADT schema CREATE SCHEMA [ADT] AUTHORIZATION dbo; GO </span> |
Second, I am going to create a table to hold the keep track of the DDL changes that are…
Various Triggers – Part 4
Another usage of Data Modification Language (DML) triggers is the replicating data for historical tracking or data aggregation. Today, I am going to expand on the AUTOS database that I created in prior articles to demonstrate such usage. The business unit has asked us to track each macro task in the making of an automobile. To accomplish this goal, I am going to add the following objects to the AUTOS database. STATUS_CODE – a coded version of the status of a given task. MAKE_STATUS – for a given vehicle…
Various Triggers – Part 3
A typical use of Data Modification Language (DML) triggers is to prevent unwanted data modification. AFTER triggers are great at detecting the INSERT, UPDATE or DELETE action and rolling back the changes. A good security model can prevent these types of changes and should be the first line of defense. However, there are cases in which keys to the castle have to be given out for political reasons inside the organization. In that case, this type of preventive programming can be handy. Today, I am going to revisit the AUTOS…
Various Triggers – Part 1
I am going to wrap up my discussion of LOGON TRIGGERS. The number and types of database triggers available to database administrators has increased over the years as the Microsoft SQL Server database engine has matured. There are now triggers for execution after both DDL and DML modifications. These triggers can be classified as AFTER – TSQL code to be executed after an action or INSTEAD OF – TSQL code to be executed in lue of a action. Triggers are commonly used in following tasks: Auditing data changes by place…
Full Text Search – Part 3
Tonight, I want to revisit the [WILD LIFE] database that we were using last time. The main goal is to correctly search the [ANIMALS] table returning all [NAME]’s that contain the word fly. We want the query plan associated with our query to use a index to speed up overall execution time. The first solution to this business problem resulted in FULL TABLE SCANS or CLUSTERED INDEX SCANS. Please see the desciptions of graphical icons that can show up in a query plan. Since every record in the table has…