Using Caché Objects - InterSystems Documentation

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Dynamic Dispatch %DispatchMethod can also resolve an unknown multidimensional property reference — that is, to get the value of a property. However, only direct multidimensional property references are supported for dynamic dispatch. $DATA, $ORDER, and $QUERY are not supported, nor is a SET command with a list of variables. 22.3.2 %DispatchClassMethod This method implements an unknown class method call. Its syntax is: ClassMethod %DispatchClassMethod(Class As %String, Method As %String, Args...) where its first two arguments are the name of the referenced class and the name of the referenced method. Its third argument is an array that holds all the arguments passed to the original method. Since the number of arguments and their types can vary depending on the method being resolved, the code in %DispatchClassMethod needs to handle them correctly (since the class compiler can not make any assumptions about the type). The Args... syntax handles this flexibly. Because %DispatchClassMethod attempts to resolve any unknown class method associated with the class, it has no specified return value; if successful, it returns a value whose type is determined by the method being resolved and whether the caller expects a return value. 22.3.3 %DispatchGetProperty This method gets the value of an unknown property. Its syntax is: Method %DispatchGetProperty(Property As %String) where its argument is the referenced property. Because %DispatchGetProperty attempts to resolve any unknown property associated with the class, it has no specified return value; if successful, it returns a value whose type is that of the property being resolved 22.3.4 %DispatchSetProperty This method sets the value of an unknown property. Its syntax is: Method %DispatchSetProperty(Property As %String, Value) where its arguments are the name of the referenced property and the value that was being attempted to be assigned to it. 190 Using Caché Objects
The Dynamic Dispatch Methods 22.3.5 %DispatchSetMultidimProperty This method sets the value of an unknown multidimensional property. Its syntax is: Method %DispatchSetMultidimProperty(Property As %String, Value, Subs...) where its first two arguments are the name of the referenced property and the value that was being attempted to be assigned to it. The third argument, Subs, is an array that contains the subscript values. Subs has an integer value that specifies the number of subscripts, Subs(1) has the value of the first subscript, Subs(2) has the value of the second, and so on. If no subscripts are given, then Subs is undefined. Only direct multidimensional property references are supported for dynamic dispatch. $DATA, $ORDER, and $QUERY are not supported, nor is a SET command with a list of variables. Note: Note that there is no %DispatchGetMultidimProperty dispatch method. This is because a multidimensional property reference is identical to a method call. Thus, such a reference invokes %DispatchMethod, which must include code to differentiate between method names and multidimensional property names. 22.3.6 %DispatchGetModified This method gets the value of the modified flag for an unknown property. Its syntax is: Method %DispatchGetModified(Property As %String) where its argument is the name of the referenced property. 22.3.7 %DispatchSetModified This method sets the value of the modified flag for an unknown property. Its syntax is: Method %DispatchSetModified(Property As %String, Value) where its arguments are the name of the referenced property and the value to set for its modified flag. Using Caché Objects 191
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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
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If the list for a particular instan
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Triggers are, however, fired by the
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14 Relationships A relationship is
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Relationship Basics the relationshi
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An Invoice class class MyApp.Invoic
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14.4 Persistent Behavior of Relatio
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Streams Stream data may be stored i
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Streams 15.2.2 Copying Data between
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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
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Page 161 and 162: About Updates Two Synchronized Data
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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 205 and 206: 23 Class Definition Classes The Cac
Page 207: You can get detailed information ab
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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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