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Professional SQL Server ™ 2005 CLR Programming with Stored Procedures, Functions, Triggers, Aggregates, and Types Derek Comingore Douglas Hinson... Library of Congress Cataloging-in-Publ

Professional SQL Server ™ 2005

CLR Programming with Stored Procedures, Functions, Triggers, Aggregates, and Types

Derek Comingore Douglas Hinson

Published by

Wiley Publishing, Inc.

10475 Crosspoint Boulevard

Indianapolis, IN 46256

www.wiley.com

Copyright © 2007 by Wiley Publishing, Inc., Indianapolis, Indiana

Published simultaneously in Canada

ISBN-13: 978-0-470-05403-1

ISBN-10: 0-470-05403-4

Manufactured in the United States of America

10 9 8 7 6 5 4 3 2 1

1MA/RX/RR/QW/IN

No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning or otherwise, except as permitted under Sections 107 or 108

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or online at http://www.wiley.com/go/permissions

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Library of Congress Cataloging-in-Publication Data

Comingore, Derek,

1978-Professional SQL server 2005 CLR programming : with stored procedures, functions, triggers, aggregates, and types / Derek Comingore and Douglas Hinson

p cm

Includes indexes

ISBN-13: 978-0-470-05403-1 (paper/website)

ISBN-10: 0-470-05403-4 (paper/website)

1 SQL (Computer program language) 2 Database management Computer programs 3 Microsoft NET Framework I Hinson, Douglas, 1968- II Title

QA76.73.S67C655 2007

005.75’85 dc22

2006031028

Trademarks:Wiley, the Wiley logo, Wrox, the Wrox logo, Programmer to Programmer, and related trade dress are trade-marks or registered tradetrade-marks of John Wiley & Sons, Inc and/or its affiliates, in the United States and other countries, and may not be used without written permission SQL Server is a trademark of Microsoft Corporation in the United States and/or other countries All other trademarks are the property of their respective owners Wiley Publishing, Inc., is not associated with any product or vendor mentioned in this book

Wiley also publishes its books in a variety of electronic formats Some content that appears in print may not be available

in electronic books

To my son, Derek Steven Comingore, and the next generation

of programmers

— Derek Comingore

To Misty, Mariah, and Kyle, for your love, support, and patience

—Douglas Hinson

About the Authors

Derek Comingoreis an independent consultant, trainer, and speaker specializing in SQL Server and NET technologies He has recently started two ventures, an online Microsoft community for colleagues to learn from one another, located at www.RedmondSociety.com, and a second for SQL Server consulting at

www.SQLServerDBAs.com Derek holds the MCAD/MCDBA Microsoft certifications, the Carnegie Mellon Personal Software Process (PSP) credential, and an AAS/BS in Computer Information Systems from University of North Dakota Derek’s blog is located at http://RedmondSociety.com/blogs/Derek

Douglas Hinsonhas worked as an independent software and database consultant in the logistics and financial industries, with an extensive SQL Server background He has coauthored several Wrox books,

including Professional SQL Server 2005 Integration Services.

types, user-defined (UDTs)

described, 4, 97

managed code

creating, altering, and dropping, 101

described, 97–99

Parse()method, 100

SqlUserDefinedTypeattribute, 101

ToString()method, 100

methods, required, 45–46

X and Y coordinates, accepting to store in SQL Server,

245–246

U

UDAs (user-defined aggregates)

altering, 96

creating, 96

described, 4, 93

managed code, 93–96

removing, 97

SqlUserDefinedAggregateattribute (Format), 96

UDF (user-defined function)

adding, 34–35

COM data type, handling, 197–199

forward-only, read-only row navigation example, 161

method name, 38

ParseRowfunction, adding to, 251

processing

forward-only, read-only row navigation example, 161

as supported object, 4

SQL CLR, 32–33

stored procedures versus, 26–27

UDTs (user-defined types)

described, 4, 97

managed code

creating, altering, and dropping, 101

described, 97–99

Parse()method, 100

SqlUserDefinedTypeattribute, 101

ToString()method, 100

methods, required, 45–46

X and Y coordinates, accepting to store in SQL Server,

245–246

unrecoverable exceptions, 257

unsafe assemblies, testing BCL, 183

unsafe permission level, 296

UNSAFEpermission set

assemblies

backing up, 321

blocking from server, 308–309

described, 9

listing, 190

OLE assembly, marking, 197

unwound calling stack, 268–269

UPDATEstatements

forward-only, read-only row navigation example, 154

logic dependent on results of, 106

updated columns, information about, 86

updating data or schema, T-SQL definition, 27

URL, Yahoo! stock retrieval service, 191–193 user errors, 257

User Interfacepermission, 296

user-defined aggregates See UDAs user-defined function See UDF user-defined types See UDTs users, controlling access See permissions

usingstatement, 35

V

values name, reading registry key, 180 NULL

data type classes, 46–48 database testing, 177–178, 181–182 syntax, 104

T-SQL, 122–123 UDFs, 199 type CTS framework, 4–5 reference type versus, 44 variable

cursors, designing around, 346–347 declaration and scope, 104–106 scoping within error-catching blocks, 270

Vbfiles, 320 VB.NET barrier of entry, perspective, 12 compiling NET DLL, 24–25 files, supported, 320 Vbprojfiles, 320 verifying

file system changes, 206 Web services, 222 VES execution environment for CIL code, 5 view, system

CPU usage, 324 creating with SQL Server metadata, 304 stored information, 29

sys.assemblies, 29–30 T-SQL performance, 161 Visual Studio

CLR routine, creating auto-deployment process, 37 creating class, 34–35 deploying class, 36–37 described, 33–34 conventions assemblies, 38 class and structure functions or methods, 38–39 classes, 38

structures, 38 debugging with SQL Server Profiler, 328–329 deployment, CLR Security, 318–319 trigger, generated T-SQL, 91 Visual Studio 2005 SQL CLR support hardware, 14–15

memory, 14

408

types, user-defined (UDTs)

Web Accesspermission, 296 Web forms, 246–248 Web services, consuming calling and passing to T-SQL procedure, 218–220 described, 213

design, 214 procedure code to implement, 217–218 publishing to location where can be found and consumed, 215–216

reference, adding and naming, 216–217 review, 214

scheduling, 223 serialization assembly, 221 testing, 220, 221–222 verifying, 222 weekends, 354, 377–378 WHERE clause, 252–253 Windows (Microsoft), 14 WinForms and SQL CLR UDTs (user-defined types) accepting WinForm input to save, 245–246 point UDT, creating, 241–242

Windows form to display, 242–245 WITH PERMISSION SETargument, 296–297

worms, detecting See server processes, auditing

X

X and Y coordinates, accepting to store in SQL Server, 245–246

X509 Storepermission, 296

content, INSERT or UPDATE, 208–210 design, 207

DOM, 290 existence, discerning, 208 problem, 207

submission, 207 testing solution, 210–212 validating, 212–213 validation, importance of, 207 xmsp_regreadprocedure, 181–182 xp_fileexist, 175

xp_regreadextended procedure, 179 XPs (Extended Stored Procedures) console applications, 238–240 described, 2

SQL CLR versus, 10

Y

Y and X coordinates, accepting to store in SQL Server, 245–246

Yahoo! stock retrieval service, 191–193

Z

zero, divide-by-error design-time checking, 274 NET structured error-handling, 269 SQL CLR error-handling, 270–271

409