Table Of Content

Transact-SQL User-Defined Functions Andrew Novick Wordware Publishing, Inc. LibraryofCongressCataloging-in-PublicationData Novick,AndrewN. Transact-SQLuser-definedfunctions/byAndrewNovick. p. cm. Includesbibliographicalreferencesandindex. ISBN1-55622-079-0(pbk.) 1. SQLserver. 2. Databasemanagement. I.Title. QA76.9.D3N6952003 005.75'85--dc22 2003020942 CIP ©2004,WordwarePublishing,Inc. AllRightsReserved 2320LosRiosBoulevard Plano,Texas75074 Nopartofthisbookmaybereproducedinanyformorbyanymeans withoutpermissioninwritingfromWordwarePublishing,Inc. PrintedintheUnitedStatesofAmerica ISBN1-55622-079-0 10 9 8 7 6 5 4 3 2 1 0309 CrystalReportsisaregisteredtrademarkofCrystalDecisions,Inc.intheUnitedStatesand/orothercountries. NamesofCrystalDecisionsproductsreferencedhereinaretrademarksorregisteredtrademarksofCrystalDecisionsor its Transact-SQLisatrademarkofSybase,Inc.oritssubsidiaries. SQLServerisatrademarkofMicrosoftCorporationintheUnitedStatesand/orothercountries. Allbrandnamesandproductnamesmentionedinthisbookaretrademarksorservicemarksoftheirrespectivecompanies. Anyomissionormisuse(ofanykind)ofservicemarksortrademarksshouldnotberegardedasintenttoinfringeonthe propertyofothers.Thepublisherrecognizesandrespectsallmarksusedbycompanies,manufacturers,anddevelopersas ameanstodistinguishtheirproducts. Thisbookissoldasis,withoutwarrantyofanykind,eitherexpressorimplied,respectingthecontentsofthisbookandany disks or programs that may accompany it, including but not limited to implied warranties for the book’s quality, performance,merchantability,orfitnessforanyparticularpurpose.NeitherWordwarePublishing,Inc.noritsdealersor distributorsshallbeliabletothepurchaseroranyotherpersonorentitywithrespecttoanyliability,loss,ordamagecaused orallegedtohavebeencauseddirectlyorindirectlybythisbook. AllinquiriesforvolumepurchasesofthisbookshouldbeaddressedtoWordwarePublishing, Inc.,attheaboveaddress.Telephoneinquiriesmaybemadebycalling: (972)423-0090 Tomyparents,ToniandLarryNovick This page intentionally left blank. Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . xv PartI—CreatingandUsingUser-DefinedFunctions . . . . . 1 1 OverviewofUser-DefinedFunctions . . . . . . . . . . . . . 3 IntroductiontoUDFs . . . . . . . . . . . . . . . . . . . . . . . . . . 4 ScalarUDFs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 InlineUser-DefinedFunctions . . . . . . . . . . . . . . . . . . . . 9 MultistatementTable-ValuedUser-DefinedFunctions . . . . . . . 12 WhyUseUDFs? . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Reuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 OrganizingCodethroughModularization. . . . . . . . . . . . . . 19 EaseofCoding. . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 WhyNotUseUDFs? . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 2 ScalarUDFs. . . . . . . . . . . . . . . . . . . . . . . . . . 23 Creating,Dropping,andAlteringScalarUDFs. . . . . . . . . . . . . 25 PermissionstoUseCREATE/DROP/ALTERFUNCTION . . . . 25 UsingtheCREATEFUNCTIONStatement . . . . . . . . . . . . 28 TheFunctionBody . . . . . . . . . . . . . . . . . . . . . . . . . 31 DeclaringLocalVariables(IncludingTABLEs) . . . . . . . . . 31 Control-of-flowStatementsandCursors. . . . . . . . . . . . . 33 UsingSQLDMLinScalarUDFs. . . . . . . . . . . . . . . . . 34 AddingtheWITHClause . . . . . . . . . . . . . . . . . . . . . . 36 SpecifyingWITHENCRYPTION . . . . . . . . . . . . . . . . 36 SpecifyingWITHSCHEMABINDING. . . . . . . . . . . . . . 39 UsingScalarUDFs . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 GrantingPermissiontoUseScalarUDFs. . . . . . . . . . . . . . 44 UsingScalarUDFsinSQLDML . . . . . . . . . . . . . . . . . . 45 UsingScalarUDFsintheSelectList . . . . . . . . . . . . . . 45 UsingScalarUDFsintheWHEREandORDERBYClauses. . 47 UsingScalarUDFsintheONClauseofaJOIN . . . . . . . . . 49 UsingScalarUDFsinINSERT,UPDATE,andDELETE Statements . . . . . . . . . . . . . . . . . . . . . . . . . . 50 UsingScalarUDFsinSETStatements . . . . . . . . . . . . . 50 UsingScalarUDFsinEXECUTEandPRINTStatements . . . 51 v Contents UsingScalarUDFsinSQLDDL . . . . . . . . . . . . . . . . . . 52 UsingScalarUDFsinCHECKConstraints . . . . . . . . . . . 53 UsingScalarUDFsinComputedColumns . . . . . . . . . . . 56 CreatingIndexesonComputedColumnswithUDFs . . . . . . 58 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61 3 WorkingwithUDFsintheSQLServerTools . . . . . . . . . 63 QueryAnalyzer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64 DebuggingUDFs . . . . . . . . . . . . . . . . . . . . . . . . . . 65 CreatingUDFswithTemplates . . . . . . . . . . . . . . . . . . . 70 SQLProfiler. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74 TryingtoGenerateYourOwnTraceEventsfromaUDF. . . . . . 79 EnterpriseManagerandOtherTools. . . . . . . . . . . . . . . . . . 80 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81 4 YouCan’tDoThatinaUDF. . . . . . . . . . . . . . . . . . 83 RestrictiononInvokingNondeterministicFunctions . . . . . . . . . 84 TaketheNondeterministicValueasaParameter. . . . . . . . . . 85 UsetheViewTrick . . . . . . . . . . . . . . . . . . . . . . . . . 86 RestrictionsonDataAccess . . . . . . . . . . . . . . . . . . . . . . 88 RestrictionsontheEXECUTEStatement. . . . . . . . . . . . . . . 88 RestrictiononAccesstoTemporaryTables . . . . . . . . . . . . . . 89 RestrictiononReturningMessages . . . . . . . . . . . . . . . . . . 90 RestrictionsonSettingConnectionOptions . . . . . . . . . . . . . . 91 NoSETCommandsAllowed . . . . . . . . . . . . . . . . . . . . 91 TheExecutionEnvironmentofaUDF . . . . . . . . . . . . . . . 92 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 5 HandlingRun-timeErrorsinUDFs. . . . . . . . . . . . . . 99 ErrorHandlingInsideUDFs . . . . . . . . . . . . . . . . . . . . . 100 TestingParametersandReturningNULL . . . . . . . . . . . . . . 106 ReturningSpecialValues . . . . . . . . . . . . . . . . . . . . . . . 107 CausingUnrelatedErrorsinUDFs . . . . . . . . . . . . . . . . . . 108 ReportingErrorsinUDFsOuttheBackDoor . . . . . . . . . . . . 109 Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111 6 Documentation,Formatting,andNamingConventions . . 113 SeparatorFirstFormatting . . . . . . . . . . . . . . . . . . . . . . 115 HeaderComments. . . . . . . . . . . . . . . . . . . . . . . . . . . 118 *description. . . . . . . . . . . . . . . . . . . . . . . . . . . 120 *RelatedFunctions. . . . . . . . . . . . . . . . . . . . . . . 120 *Attribution. . . . . . . . . . . . . . . . . . . . . . . . . . . 120 *MaintenanceNotes . . . . . . . . . . . . . . . . . . . . . . 120 *Example. . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 *Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121 *TestScript. . . . . . . . . . . . . . . . . . . . . . . . . . . 122 vi Contents *History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122 *Copyright . . . . . . . . . . . . . . . . . . . . . . . . . . . 122 What’sNotintheHeader . . . . . . . . . . . . . . . . . . . . . 122 *Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . 122 *AlgorithmandFormulas. . . . . . . . . . . . . . . . . . . . 123 NamingConventions . . . . . . . . . . . . . . . . . . . . . . . . . 123 NamingUser-DefinedFunctions. . . . . . . . . . . . . . . . . . 123 NamingColumns. . . . . . . . . . . . . . . . . . . . . . . . . . 129 DomainNames. . . . . . . . . . . . . . . . . . . . . . . . . . . 129 NamingFunctionParametersandLocalVariables. . . . . . . . . 131 Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131 7 InlineUDFs . . . . . . . . . . . . . . . . . . . . . . . . . 133 ManagingPermissionsonInlineUDFs. . . . . . . . . . . . . . . . 133 PermissionstoCreate,Alter,andDropInlineUDFs . . . . . . . 134 PermissiontoUseInlineUDFs . . . . . . . . . . . . . . . . . . 134 CreatingInlineUDFs . . . . . . . . . . . . . . . . . . . . . . . . . 134 TemplateforInlineUDFs . . . . . . . . . . . . . . . . . . . . . 136 CreatingaSampleInlineUDF . . . . . . . . . . . . . . . . . . . 137 RetrievingDatawithInlineUDFs. . . . . . . . . . . . . . . . . . . 138 SortingDatainInlineUDFs. . . . . . . . . . . . . . . . . . . . . . 140 UpdatableInlineUDFs . . . . . . . . . . . . . . . . . . . . . . . . 141 UsingInlineUDFsforPagingWebPages. . . . . . . . . . . . . . . 146 RetrievingMinimalDataforEachWebPage . . . . . . . . . . . 146 CreatingtheInlineUDF . . . . . . . . . . . . . . . . . . . . . . 147 Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153 8 MultistatementUDFs . . . . . . . . . . . . . . . . . . . . 155 ManagingPermissionsonMultistatementUDFs. . . . . . . . . . . 156 PermissionstoCreate,Alter,andDropMultistatementUDFs . . 156 PermissiontoSelectonMultistatementUDFs . . . . . . . . . . 156 CreatingandUsingMultistatementUDFs . . . . . . . . . . . . . . 157 TemplateforMultistatementUDFs . . . . . . . . . . . . . . . . 161 UsingCursorsinUDFswithaTemplate. . . . . . . . . . . . . . 163 ListManagement . . . . . . . . . . . . . . . . . . . . . . . . . . . 164 CreatingTablesfromDelimitedText . . . . . . . . . . . . . . . 165 TurningTablesintoDelimitedText . . . . . . . . . . . . . . . . 169 UsingUDFstoReplaceCodeTables. . . . . . . . . . . . . . . . 172 Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173 9 MetadataaboutUDFs. . . . . . . . . . . . . . . . . . . . 175 SystemStoredProcedurestoHelpwithUDFs. . . . . . . . . . . . 176 sp_help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176 sp_helponaScalarUDF . . . . . . . . . . . . . . . . . . . . 177 sp_helponanInlineUDF. . . . . . . . . . . . . . . . . . . . 177 sp_helponMultistatementUDFs. . . . . . . . . . . . . . . . 179 vii Contents sp_helptext. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180 sp_rename . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181 sp_depends. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182 RetrievingMetadataaboutUDFs. . . . . . . . . . . . . . . . . . . 183 FindingoutaboutUDFsinINFORMATION_SCHEMA . . . . . 183 INFORMATION_SCHEMA.ROUTINES. . . . . . . . . . . . 184 INFORMATION_SCHEMA.ROUTINE_COLUMNS . . . . . 185 INFORMATION_SCHEMA.PARAMETERS . . . . . . . . . 185 Built-inMetadataFunctions . . . . . . . . . . . . . . . . . . . . 186 InformationaboutUDFsinSystemTables . . . . . . . . . . . . 187 MetadataUDFs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188 FunctionInformation. . . . . . . . . . . . . . . . . . . . . . . . 189 WhatAretheColumnsReturnedbyaUDF? . . . . . . . . . . . 190 WhatAretheParametersUsedWhenInvokingaUDF? . . . . . 192 MetadataFunctionsthatWorkonAllObjects . . . . . . . . . . . 193 SQL-DMO. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196 Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196 10 UsingExtendedStoredProceduresinUDFs . . . . . . . . 197 Whichxp_sCanBeUsedinaUDF? . . . . . . . . . . . . . . . . . 198 xp_logevent. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199 xp_sprintf. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208 sp_OA*andOLEAutomation:TheKeystotheVault . . . . . . . . 210 PermissionstoUsesp_OA* . . . . . . . . . . . . . . . . . . . . 210 PickingtheBestUsesofOLEAutomation . . . . . . . . . . . . 211 InvokingaCOMObject . . . . . . . . . . . . . . . . . . . . . . 212 BreakingDownanHRESULT . . . . . . . . . . . . . . . . . . . 215 LoggingOLEAutomationErrors . . . . . . . . . . . . . . . . . 219 CreatingaUsefulOLEAutomationUDF . . . . . . . . . . . . . 221 EncapsulatingPropertiesandMethodswithUDFs . . . . . . . . 223 InvokingYourOwnOLEObjects . . . . . . . . . . . . . . . . . 223 Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228 11 TestingUDFsforCorrectnessandPerformance . . . . . . 229 EmbeddingTestsintheHeaderoftheUDF . . . . . . . . . . . . . 230 TestScripts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231 DrillingDownintothePerformanceProblem . . . . . . . . . . . . 235 TheFunctionandtheTemplateforTestingPerformance. . . . . 236 ConstructingaLargeTestTable. . . . . . . . . . . . . . . . . . 239 ExperimentingwithUDFvs.ExpressionPerformance. . . . . . 242 Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244 12 ConvertingbetweenUnitSystems . . . . . . . . . . . . . 247 GettingConversionFactorsfortheMetricSystem. . . . . . . . . . 248 DesignIssuesforUnitConversions. . . . . . . . . . . . . . . . . . 250 ScalingtheResults. . . . . . . . . . . . . . . . . . . . . . . . . 253 viii Contents CombiningScaleandPrecision. . . . . . . . . . . . . . . . . . . 253 WritingtheConversionFunctions . . . . . . . . . . . . . . . . . . 255 ConvertingMeasurementstheSimpleWay. . . . . . . . . . . . 255 AddingtheChoiceofOutputUnits. . . . . . . . . . . . . . . . . 258 Anything-to-AnythingConversions . . . . . . . . . . . . . . . . 260 PuttingtheUnitConversionFunctionstoWork . . . . . . . . . . . 262 WhatIsEqual?. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266 TestingNumbersforEquality . . . . . . . . . . . . . . . . . . . 268 ReducingBugReportsDuetoNumericRounding. . . . . . . 274 Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275 13 CurrencyConversion . . . . . . . . . . . . . . . . . . . . 277 BackgroundonVariableExchangeRates . . . . . . . . . . . . . . . 278 DesignIssuesforCurrencyConversion . . . . . . . . . . . . . . . 279 CreatingtheSchematoSupporttheFunctions . . . . . . . . . . 279 PickingDataTypesforAmountsandExchangeRates . . . . . . 280 ReturningaMeaningfulResultWhenDataIsMissing. . . . . 281 WritingtheFunctionsforCurrencyConversion . . . . . . . . . . . 283 UsingCurrencyConversionFunctions . . . . . . . . . . . . . . . . 289 Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291 PartII—SystemUser-DefinedFunctions . . . . . . . . . . 293 14 IntroductiontoSystemUDFs . . . . . . . . . . . . . . . . 295 DistinguishingSystemUDFsfromOtherFunctions . . . . . . . . . 296 NamingRequirementsforSystemUDFs . . . . . . . . . . . . . 297 Location,Location,Location. . . . . . . . . . . . . . . . . . . . 297 ReferencingSystemUDFs. . . . . . . . . . . . . . . . . . . . . 298 PayNoAttentiontotheManBehindtheUDFCurtain . . . . . . 299 DocumentedSystemUDFs. . . . . . . . . . . . . . . . . . . . . . 300 Special-purposeSystemUDFs . . . . . . . . . . . . . . . . . . . . 302 fn_helpcollations . . . . . . . . . . . . . . . . . . . . . . . . . . 302 fn_virtualservernodes . . . . . . . . . . . . . . . . . . . . . . . 304 fn_servershareddrives . . . . . . . . . . . . . . . . . . . . . . . 304 fn_get_sql. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 305 ViewingaConnection’sSQLtheOldWay . . . . . . . . . . . 305 Callingfn_get_sql . . . . . . . . . . . . . . . . . . . . . . . . 306 AnExampleofUsingfn_get_sql . . . . . . . . . . . . . . . . 308 Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 312 15 DocumentingDBObjectswithfn_listextendedproperty . . 313 UnderstandingandCreatingExtendedProperties . . . . . . . . . . 314 MaintainingExtendedProperties . . . . . . . . . . . . . . . . . 314 MaintainingMS_DescriptionUsingEnterpriseManager. . . . . 316 Usingfn_listextendedproperty . . . . . . . . . . . . . . . . . . . . 317 TheProblemwithNULLArgumentstofn_listextendedproperty 320 ix Contents UnderstandingNULLArgumentstofn_listextendedproperty . . 322 Task-orientedUDFsthatUsefn_listextendedproperty . . . . . . . 324 FetchinganExtendedPropertyforAllTables. . . . . . . . . . . 324 FetchinganExtendedPropertyforAllColumns . . . . . . . . . 328 FindingMissingTableDescriptions . . . . . . . . . . . . . . . . 331 ReportingonAllTables . . . . . . . . . . . . . . . . . . . . . . 333 Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335 16 Usingfn_virtualfilestatstoAnalyzeI/OPerformance . . . 337 Callingfn_virtualfilestats . . . . . . . . . . . . . . . . . . . . . . . 338 GettingSupportingInformation. . . . . . . . . . . . . . . . . . . . 339 MetadataFunctionstoGetDatabaseandFileIDs. . . . . . . . . 339 ConvertingLogicalFileNamestoPhysicalFileNames. . . . . . 341 What’sinsysfiles?. . . . . . . . . . . . . . . . . . . . . . . . 341 What’sinmaster..sysaltfiles?. . . . . . . . . . . . . . . . . . 342 HowLongHastheInstanceBeenUp? . . . . . . . . . . . . . . 344 StatisticsfortheSQLServerInstance . . . . . . . . . . . . . . . . 346 SummarizingtheFileStatisticswithUDFs. . . . . . . . . . . . . . 347 GettingStatisticsforaSingleDatabase . . . . . . . . . . . . . . 348 GettingStatisticsbyDatabase . . . . . . . . . . . . . . . . . . . 349 BreakingDowntheI/OStatisticsbyPhysicalFile. . . . . . . . . 350 I/OStatisticsbyDiskDrive . . . . . . . . . . . . . . . . . . . . 352 Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 353 17 fn_trace_*andHowtoCreateandMonitorSystemTraces. 355 ScriptingTraces . . . . . . . . . . . . . . . . . . . . . . . . . . . . 357 fn_trace_getinfo . . . . . . . . . . . . . . . . . . . . . . . . . . . . 360 udf_Trc_InfoTAB. . . . . . . . . . . . . . . . . . . . . . . . . . 363 PivotingDatatoCreatetheColumns . . . . . . . . . . . . . . . 364 MiningBitsfromtheTraceOptionsField . . . . . . . . . . . . . 366 StoppingTraces. . . . . . . . . . . . . . . . . . . . . . . . . . . 366 fn_trace_gettable . . . . . . . . . . . . . . . . . . . . . . . . . . . 370 fn_trace_geteventinfo . . . . . . . . . . . . . . . . . . . . . . . . . 372 MakingaListofEvents . . . . . . . . . . . . . . . . . . . . . . 374 AdditionalUDFsBasedonfn_trace_geteventinfo. . . . . . . . . 376 fn_trace_getfilterinfo . . . . . . . . . . . . . . . . . . . . . . . . . 377 ConvertingOperatorCodestoReadableText . . . . . . . . . 377 SampleOutputfromfn_trace_getfilterinfo . . . . . . . . . . . 378 ConvertingtheFilterintoaWHEREClause. . . . . . . . . . 379 ReportingonAllRunningTraces . . . . . . . . . . . . . . . . . . . 384 Summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 386 18 UndocumentedSystemUDFs . . . . . . . . . . . . . . . . 387 ListingAllSystemUDFs . . . . . . . . . . . . . . . . . . . . . . . 388 SourceCodefortheUndocumentedSystemUDFs . . . . . . . . . 389 SelectedUndocumentedSystemUDFs. . . . . . . . . . . . . . . . 392 x

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