Using Caché Objects - InterSystems Documentation

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The Caché Data Population Utility Property Colors As %String(POPSPEC="ValueList("",Red,Green,Blue"")") [Collection = list]; Property Kids As Person(POPSPEC=":5") [Collection = list]; Property Addresses As Address(POPSPEC=":3") [Collection = list]; Note: In Studio, each property definition needs to appear on a single line. For the Colors property, the Populate method generates data using the ValueList method of the PopulateUtils class, and follows basic POPSPEC syntax. For the Kids property, there is no specified method, which results in automatically generated references. For the Addresses property, there is 19.2.3 Populating Arrays To populate an array, the syntax for setting the value of POPSPEC is: Property Prop As TypeNm (POPSPEC="MethodNm:MaxNo:KeySpec") [Collection= array]; where Prop is an array of type TypeNm; MethodNm is the populating method for the property; MaxNospecifies the maximum number of elements in the list; and KeySpec is the populating method used to generate the key for each element of an array. If MaxNo is not specified, it defaults to 10. If KeySpec is not specified, it defaults to String. In the following example, there are arrays of several types of data and different kinds of keys being generated as well: Property Tix As %Integer(POPSPEC="Integer():20:Date()") [Collection = array]; Property Reviews As Review(POPSPEC=":3:Date()") [Collection = array]; Property Actors As Actor(POPSPEC=":15:Name()") [Collection = array]; The Attendance property has its data generated using the ValueList method of the PopulateUtils class; its keys are generated using the Date method of the PopulateUtils class. The Tix property has no specified method, which results in automatically generated references , and has its keys also generated using the Date method. The Actors property has no specified method, which results in automatically generated references, and has its keys generated using the Name method of the PopulateUtils class. 19.2.4 Custom Populate Actions To perform custom actions with the Populate method, use the OnPopulate callback method. 166 Using Caché Objects
Details 19.3 Details This section describes how %Populate works internally. The %Populate class contains two method generators: Populate and PopulateSerial. Each persistent or serial class inheriting from %Populate has one or the other of these two methods included in it (as appropriate). We will describe only the Populate method here. The Populate method is a loop, that is repeated for each of the requested number of objects. Inside the loop, the code: • Creates a new object • Sets values for its properties • Saves and closes the object A simple property with no overriding POPSPEC parameter has a value generated using code with the form: Set obj.Description = ##class(%PopulateUtils).String(50) While using a library method from %PopulateUtils via a “Name:Name()” specification would generate: Set obj.Name = ##class(%PopulateUtils).Name() An embedded Home property might create code like: Do obj.HomeSetObject(obj.Home.PopulateSerial()) The generator loops through all the properties of the class, and creates code for some of the properties, as follows: • It checks if the property is private, is calculated, is a collection, or has an initial expression (in that order). If any of these are true, the generator exits. • If the property is has a POPSPEC override, the generator uses that and then exits. • If the property is a reference, on the first time through the loop, the generator builds a list of random IDs, takes one from the list, and then exits. For the subsequent passes, the generator simply takes an ID from the list and then exits. • If the property name either “Name” , “SSN” , “Company” , “Title” , “Phone” , or “Zip” , the generator then uses the corresponding library method “Name” , “SSN” , “Company” , “Title” , “USPhone” , or “USZip” . It then exits. Using Caché Objects 167
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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
Page 127 and 128: The Object-SQL Projection 13.2 The
Page 129 and 130: The Object-SQL Projection 13.2.2.1
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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 184 and 185: Using Callback Methods ReturnValue
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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