Using Caché Objects - InterSystems Documentation

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Introduction to Caché Objects The Class Dictionary contains two distinct types of data: • Definition Data—the actual class definitions that users create. • Compilation Data—data generated as a result of compiling class definitions is also stored. This data includes the results of inheritance resolution; that is, it lists all the defined and inherited members for a given class. The Class Compiler uses this to make other compilation more efficient; applications can also use it (via the appropriate interface) to get runtime information about class members. The Class Dictionary stores its data in a set of globals (persistent arrays) whose names start with ^odd. The structure of these arrays may change with new versions of Caché, so applications should never directly observe or modify these structures. 1.3 The Caché Class Library The Caché Class Library contains a set of pre-built classes. It is automatically installed with every Caché system within the CACHELIB database. You can view the contents of the Caché Class Library using the online class documentation system provided with Caché. The Caché Class Library contains a number of packages, each of which contains a family of classes. Some of these are internal and Caché Objects uses them as part of its implementation. Other classes provide features which are designed for use in applications. The main packages within the Caché Class Library include: 4 Using Caché Objects
Development Tools Caché Class Library Packages Package %Activate %Compiler %CSP %csr %Library %Net %Projection %SQL %Studio %SYSTEM %XML Description Classes used by the Caché Activate ActiveX gateway. Internal classes used by the Caché Class Compiler. Classes used by Caché Server Pages. A set of generated internal classes that implement the standard CSP rules. The core set of Caché “behavioral” classes (such as %Persistent). Also includes the various data types, collections, and stream classes. A set of classes providing various internet-related features (such as e-mail, HTTP requests, etc.) A set of projection classes that generate client-side code for user classes. Internal classes used by Caché SQL. Internal classes used by Caché Studio. The various System API classes accessible via the $System special variable. Classes used to provide XML and SAX support within Caché. 1.4 Development Tools Caché includes a number of tools for developing object-based applications. In addition, it is quite easy to use Caché with other development environments. 1.4.1 Caché Studio Caché Studio is an integrated, visual development environment for creating Caché class definitions. See the Caché Studio User's Guide for more details. Using Caché Objects 5
Page 1 and 2: Using Caché Objects Version 5.2 01
Page 3 and 4: Table of Contents 1 Introduction to
Page 5 and 6: 7 Properties ......................
Page 7 and 8: 13.1 Inheritance and SQL ..........
Page 9 and 10: 20.8 %OnNew .......................
Page 11 and 12: List of Figures Embeddable Objects
Page 13 and 14: 1 Introduction to Caché Objects Th
Page 15: 1.2 Class Definitions and the Class
Page 19 and 20: • The Caché EJB Binding—a vers
Page 21 and 22: 2 Object-Oriented Database Developm
Page 23 and 24: Encapsulation Caché exploits inher
Page 25 and 26: 3 The Caché Object Model The Cach
Page 27 and 28: Referring to an Object — OREF, OI
Page 29 and 30: Types of Classes 3.2.1 Transient Ob
Page 31 and 32: Types of Classes Embeddable Objects
Page 33 and 34: A class inherits all of the specifi
Page 35: 2. It resolves inheritance—it det
Page 38 and 39: Caché Classes • Class Parameters
Page 40 and 41: Caché Classes ClientDataType Descr
Page 42 and 43: Caché Classes Internally, this wor
Page 44 and 45: Packages Class Packages Any of thes
Page 46 and 47: Packages Letting the compiler resol
Page 48 and 49: Packages • “%Library” —any
Page 50 and 51: Methods where count and state are d
Page 52 and 53: Methods 6.4 Method Language You hav
Page 54 and 55: Methods 6.6 Instance and Class Meth
Page 56 and 57: Methods Write dog.Speak() Which cou
Page 58 and 59: Properties 7.1 Property Keywords Yo
Page 60 and 61: Properties Property Behavior The pr
Page 62 and 63: Properties 7.5 Attribute Properties
Page 64 and 65: 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.
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16 Class Projections Class projecti
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RemoveProjection The RemoveProjecti
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17 Object Synchronization Object sy
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About Updates • If two changes re
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About Updates Two Synchronized Data
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• classname is a quoted string th
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Set Status = TargetSyncSet.Import(f
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18 Method Generators A powerful fea
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Method Generator Context 6. It copi
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Implementing Method Generators 3. A
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The Caché Data Population Utility
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Using Callback Methods Since differ
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Using Callback Methods ReturnValue
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Using Callback Methods 20.6 %OnDele
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Using Callback Methods 20.10 %OnRol
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21 Object-Specific ObjectScript Fea
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##this Syntax >Do ##class(Package.C
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##super Syntax 21.4 ##super Syntax
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You can override a property's defau
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Dynamic Dispatch 22.2 Content of Me
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Dynamic Dispatch %DispatchMethod ca
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23 Class Definition Classes The Cac
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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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