Using Caché Objects - InterSystems Documentation

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Object Synchronization Note: The numbers associated with each transaction do not provide any form of a timestamp. Rather, they indicate the sequence of filing for transactions within an individual database. Once synchronization of database A with database B is completed, the two databases might appear as follows: Two Databases, Where One Has Been Synchronized to the Other Because the transactions are being added to database B, they result in new transaction numbers in that database. Analogously, the synchronization of database B with database A results in 117, 124, 130, and 136 being added to database A (and receiving new transaction numbers there): 148 Using Caché Objects
About Updates Two Synchronized Databases Note that database B's transactions that have come from database A (140 through 162) are not updated back to database A. This is because the update from B to A uses a special feature that is part of the synchronization functionality. It works as follows: 1. Each transaction in a database is labeled with what can be called “a database of origin.” In this example, database B's transaction 140 would be marked as originating in database A, while its transaction 136 would be marked as originating in itself (database B). 2. The SyncSet.AddTransactions method, which bundles a set of transactions for synchronization, allows you to exclude transactions that originate in a particular database. Hence, when updating from B to A, AddTransactions excludes all transactions which originate in database A — since those have already been added to the transaction list for database B. Using Caché Objects 149
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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
Page 110 and 111: Data Types The property is restrict
Page 112 and 113: Object Persistence 1. Its primary (
Page 114 and 115: Object Persistence Note: In a multi
Page 116 and 117: Object Persistence // Open person "
Page 118 and 119: Object Persistence For example: //
Page 120 and 121: Object Persistence If a persistent
Page 122 and 123: Object Persistence The storage clas
Page 125 and 126: 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
Page 131 and 132: 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: About Updates • If two changes re
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
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Internet Classes addressed to , its
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Internet Classes For more informati
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Object Concurrency Setting 1 2 3 4
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Object Concurrency Note: You can us
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