Necessary Evils, Building Optimized CRUD Procedures

Necessary Evils, Building Optimized CRUD Procedures

Jason Strate

e: jstrate@pragmaticworks.com

e: jasonstrate@gmail.com

b: www.jasonstrate.com

t: StrateSQL

Resources jasonstrate.com

Introduction

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Session Goals

1. Describe the uses for CRUD procedures in databases

2. Identify the common problems associated with CRUD procedures

3. Demonstrate methods for writing performantCRUD procedures

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What is CRUD?

CREATE, READ, UPDATE, DELETE

• ABCD: add, browse, change, delete• BREAD: browse, read, edit, add, delete• QDIM: query, delete, insert, modify• SAID: show, alter, insert, delete• VEDAS: view, edit, delete, add, search• VADE(R): view, add, delete, edit

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Code Generation

• Many tools available:

– T-SQL Script

– Code Smith

– Entity Framework

– LINQ to SQL

– NHibernate

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CRUD Issues?

• Treat tables as objects– People?

– Relationships?

– Relationship Type?

• Overly generic– All columns touched

– One procedure to rule them all

• Performance– Set versus Singleton

– Index selection

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Perspectives

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CREATE, UPDATE, AND DELETE

Overview

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CREATE

CREATE = INSERT

Issues:

• Singleton insert

• All columns affected

INSERT INTO dbo.Foo

(Column1, Column2)

VALUES(@Column1,

@Column2)

EXEC CRUD.FooInsert

@Column1 = 'Value‘,

@Column2 = 2

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UPDATE = UPDATE

Issues:

Singleton update

All columns affected

UPDATE

UPDATE dbo.Foo

SET Column1 = @Column1

WHERE Column2 =

@Column2

EXEC CRUD.FooUpdate

@Column1 = 'Value‘,

@Column2 = 2

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DELETE

DELETE = DELETE

Issues:

• Singleton delete

DELETE FROM dbo.Foo

WHERE Column2 = Column2

EXEC CRUD.FooDelete

@Column2 = 2

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T-SQL Features

• Performance

– Table Valued Functions (TVF)

– Table Valued Parameters (TVP)

– XML document

– Merge statement

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CREATE, UPDATE, AND DELETE

Demos

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READ

Overview

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READ

• READ = SELECT

Issues

• Index selectivity

SELECT Column1

,Column2

FROM dbo.Foo

WHERE (@Column1 IS NULL

OR Column1 = @Column1)

AND (@Column2 IS NULL

OR Column2 = @Column2)

EXEC CRUD.FooSelect

@Column1 = NULL

,@Column2 = 2

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READ

Demo

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Summary

1. CRUD isn’t necessarily bad

2. Generic templates offer ability to tune and extend data model behind the scenes.

3. Be cautious in choosing a template for CRUD

4. Know what SQL Server is doing

5. Leverage RECOMPILE as needed

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Learn More About Performance

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For more information…

Name: Jason Strate

Email: jstrate@pragmaticworks.com

Blog: www.jasonstrate.com