Using Caché Objects - InterSystems Documentation

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Using Callback Methods ReturnValue Insert A %Status code, where returning a failure status from %OnAfterSave causes %Save to fail and ultimately roll back the transaction. A flag indicating if the object being saved is being inserted into the extent (1) or that it is already part of the extent (0). This method is available to the %Library.Persistent class and its subclasses. 20.3 %OnBeforeSave This instance method is called by the %Save method just before an object is saved. This method allows you to request user confirmation before completing an action and can also serve to ensure the validity of an instance's data and relationships prior to saving the instance to disk. Its syntax is: ReturnValue %OnBeforeSave(Insert as Boolean) where: ReturnValue Insert A %Status code, where an error code causes the save to fail. A flag indicating if the object being saved is being inserted into the extent (1) or that it is already part of the extent (0). This method is available to the %Library.Persistent class and its subclasses. 20.4 %OnClose This instance method is called by the %Close method just before an object is closed. One use of this method is to release resources that Caché does not directly control, but are logically related to the application, such when an object represents a communication device and closing the object invokes the %OnClose code to drop the connection. 172 Using Caché Objects
%OnConstructClone Its syntax is: ReturnValue %OnClose() where: ReturnValue A %Status code. The return value is not used by %Close. This method is available to the %Library.RegisteredObject class and its subclasses. 20.5 %OnConstructClone This instance method is called by the %ConstructClone method immediately after the structures have been allocated for the cloned object and all the data has been copied into it. The method allows you to perform any additional actions related to the cloned object, such as taking out a lock or resetting any of the clone's property values. Its syntax is: ReturnValue %OnConstructClone(Object As %RegisteredObject, Deep As %Boolean) where: ReturnValue Object Deep A %Status code, where an error code prevents the clone from being created. The OREF of the object that was cloned. How “deep” the cloning process is, where 0 specifies that the clone points to the same related objects as the original; 1 causes objects related to the object being cloned to also be cloned, so that the clone gets its own set of related objects. This method is available to the %Library.RegisteredObject class and its subclasses. Using Caché Objects 173
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Using Caché Objects Version 5.2 01
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Table of Contents 1 Introduction to
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7 Properties ......................
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13.1 Inheritance and SQL ..........
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20.8 %OnNew .......................
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List of Figures Embeddable Objects
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1 Introduction to Caché Objects Th
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1.2 Class Definitions and the Class
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Development Tools Caché Class Libr
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• The Caché EJB Binding—a vers
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2 Object-Oriented Database Developm
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Encapsulation Caché exploits inher
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3 The Caché Object Model The Cach
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Referring to an Object — OREF, OI
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Types of Classes 3.2.1 Transient Ob
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Types of Classes Embeddable Objects
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A class inherits all of the specifi
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2. It resolves inheritance—it det
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Caché Classes • Class Parameters
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Caché Classes ClientDataType Descr
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Caché Classes Internally, this wor
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Packages Class Packages Any of thes
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Packages Letting the compiler resol
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Packages • “%Library” —any
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Methods where count and state are d
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Methods 6.4 Method Language You hav
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Methods 6.6 Instance and Class Meth
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Methods Write dog.Speak() Which cou
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Properties 7.1 Property Keywords Yo
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Properties Property Behavior The pr
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Properties 7.5 Attribute Properties
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Properties You can manipulate a col
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8 Class Queries Class queries provi
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Query Basics Final Specifies that s
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Caché ObjectScript. These queries
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The data in Row is the result of ex
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9 Indices Indexes provide a mechani
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Index Collation 9.2 Index Collation
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10 Using Objects with Caché Object
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Executing Methods 10.1.3 Executing
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Opening Objects 10.3 Opening Object
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where oref is the OREF of the speci
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For example, to populate the Home p
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change the second vaccination recor
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There are two types of array proper
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Saving Objects 10.5 Saving Objects
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mation. Again, this method deletes
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Set rset = ##class(%ResultSet).%New
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Executing Queries // Create a Resul
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Data Types 11.1 Available Types Cac
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Data Types • INDEXSUBSCRIPTS —
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Data Types CLIENTDATATYPE Values Va
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Data Types SQLCATEGORY Values Value
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Data Types The property is restrict
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Object Persistence 1. Its primary (
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Object Persistence Note: In a multi
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Object Persistence // Open person "
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Object Persistence For example: //
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Object Persistence If a persistent
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Object Persistence The storage clas
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13 Objects and SQL A key aspect of
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The Object-SQL Projection 13.2 The
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The Object-SQL Projection 13.2.2.1
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The Object-SQL Projection • The p
Page 133 and 134: If the list for a particular instan
Page 135 and 136: Triggers are, however, fired by the
Page 137 and 138: 14 Relationships A relationship is
Page 139 and 140: Relationship Basics the relationshi
Page 141 and 142: An Invoice class class MyApp.Invoic
Page 143: 14.4 Persistent Behavior of Relatio
Page 146 and 147: Streams Stream data may be stored i
Page 148 and 149: Streams 15.2.2 Copying Data between
Page 150 and 151: Streams Set stream=##class(%Stream.
Page 153 and 154: 16 Class Projections Class projecti
Page 155 and 156: RemoveProjection The RemoveProjecti
Page 157 and 158: 17 Object Synchronization Object sy
Page 159 and 160: About Updates • If two changes re
Page 161 and 162: About Updates Two Synchronized Data
Page 163 and 164: • classname is a quoted string th
Page 165 and 166: Set Status = TargetSyncSet.Import(f
Page 167 and 168: 18 Method Generators A powerful fea
Page 169 and 170: Method Generator Context 6. It copi
Page 171: Implementing Method Generators 3. A
Page 174 and 175: The Caché Data Population Utility
Page 182 and 183: Using Callback Methods Since differ
Page 186 and 187: Using Callback Methods 20.6 %OnDele
Page 188 and 189: Using Callback Methods 20.10 %OnRol
Page 191 and 192: 21 Object-Specific ObjectScript Fea
Page 193 and 194: ##this Syntax >Do ##class(Package.C
Page 195 and 196: ##super Syntax 21.4 ##super Syntax
Page 197: You can override a property's defau
Page 200 and 201: Dynamic Dispatch 22.2 Content of Me
Page 202 and 203: Dynamic Dispatch %DispatchMethod ca
Page 205 and 206: 23 Class Definition Classes The Cac
Page 207: You can get detailed information ab
Page 210 and 211: Internet Classes addressed to , its
Page 212 and 213: Internet Classes For more informati
Page 214 and 215: Object Concurrency Setting 1 2 3 4
Page 216 and 217: Object Concurrency Note: You can us
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