Programming Guide - Actian

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External ClassesExample—ActiveX ControlsThe following code is an example of how an ActiveX control can be coded inOpenROAD. It displays a web page in an OpenROAD frame. It assumes thatthe frame contains the following fields:browserSpecifies an OpenROAD external object (an ActiveX control inserted intothe frame)urlfieldSpecifies an OpenROAD entry fieldforwardbackSpecifies an OpenROAD button fieldSpecifies an OpenROAD button fieldinitialize()=declareenddeclarebegincurframe.flush();urlfld = 'http://www.cai.com';browser.navigate(urlfld);endon click forward =beginbrowser.goforward();endon click back =beginbrowser.goback();endon setvalue urlfld =beginbrowser.navigate(urlfld);end;on extclassevent 'statustextchange'(text = varchar(256) not null)=begincurframe.statustext = text;end;on extclassevent 'beforenavigate'(url = varchar(256) not null) =beginurlfld = url;end;138 <strong>Programming</strong> <strong>Guide</strong>
How You Can Create Fields from User ClassesHow You Can Create Fields from User ClassesYou can create fields that correspond to the simple attributes of a user class.In the Frame Editor, click Insert, Fields from User Class. A pop-up window letsyou select a user class from those defined in your application. You can alsospecify whether you want to create simple fields or a table field. Once youselect a user class, the Frame Editor lets you place the new field or fields onthe frame. If the user class contains both simple attributes and attributes thatare objects, fields are created only for the simple attributes.If the data type of a composite field (except tablefield) is set to be a userclass, the displayed values of the fields in the composite field can be modifiedby changing the value of the underlying user class object—if the Updfieldmethod is called on the field. However, setting the underlying user class objectto NULL does not change the display.How You Can Manipulate Objects Generically: CastingIn developing OpenROAD applications, you generally work with an object of aspecific class. For example, when you set the background color for a button,you use the BgColor attribute of the ButtonField class. When your code iscompiled, OpenROAD ensures that the attribute or method you specify isdefined for the system class or one of its superclasses.There are occasions, however, when you do not know at development timewhat object you will be manipulating at runtime. For example, if you want tochange the characteristics of a field based on user interaction, such aschanging the color of a field as the user enters and leaves it, you must be ableto set attributes for an object whose type you do not know as you write thecode. To facilitate your writing such generic code, OpenROAD provides specialattributes and methods for certain system classes.FrameExec's TriggerField attribute, for example, lets you detect which fieldtriggered the executing event block. To color-highlight a field when the usermoves into and out of it, you can use the TriggerField attribute to locate thefield triggering the Entry and Exit events.There are also occasions when you code generically with methods. Forexample, when you send a MessageObject from one frame to another bypassing it as a parameter to FrameExec's SendUserEvent method, thereceiving frame must know what kind of object to expect.Working with Classes 139
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Ingres OpenROAD ® 2006Programming
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ContentsChapter 1: Introduction 13I
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Using an Object-oriented Approach t
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How You Can Retrieve Array Informat
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Chapter 12: Managing Event Queues 3
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Chapter 17: Preprocessing Your 4GL
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Chapter 1: IntroductionThis section
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ConventionsConventionsThe following
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Your Support OptionsYour Support Op
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OpenROAD NamesThe rules for these n
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OpenROAD Names3. Enclosing field sc
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OpenROAD NamesThe following code ex
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VariablesThe following illustrates
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VariablesIn the first example, film
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VariablesOpenROAD checks references
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VariablesHow You Can Declare Dynami
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VariablesFor example, assume that y
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ExpressionsHowever, you cannot use
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ExpressionsThe general syntax for h
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ExpressionsCurSessionSpecifies, for
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ExpressionsString OperatorThe conca
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ExpressionsOperatorlikenot likeOper
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Expressions• You can use the esca
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ExpressionsBecause procedures can r
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System-defined FunctionsThis rule h
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System-defined FunctionsNameOperand
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System-defined FunctionsName Operan
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System-defined FunctionsNameshift(c
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System-defined FunctionsSome date f
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System-defined FunctionsThe followi
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System-defined FunctionsCount Funct
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System-defined FunctionsResult Data
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Chapter 3: Writing Scripts and Proc
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ScriptsDeclare local variables that
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ScriptsUserEventSpecifies a user ev
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ScriptsExample—Field and Menu Ite
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ProceduresOpenROAD lets you create
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ProceduresReturning from a Procedur
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ProceduresExample—Local Procedure
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Procedures4GL DataTypedatemoneyfloa
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Calling Procedures• In this call
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Calling ProceduresparameterAssigns
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Page 96 and 97: How You Can Invoke FramesHow the Cu
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Page 108 and 109: How You Can Invoke Frames• Prompt
Page 110 and 111: How You Can Invoke FramesThe syntax
Page 112 and 113: How You Can Run Non-interactive App
Page 114 and 115: How You Can Reference ObjectsHow Yo
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Page 122 and 123: InheritanceClass RelationshipsYou c
Page 124 and 125: InheritanceYou can specify a user c
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Page 130 and 131: How You Can Create a User ClassHow
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Page 136 and 137: External ClassesHow You Can Use Ext
Page 140 and 141: How You Can Manipulate Objects Gene
Page 142 and 143: Overview of the OpenROAD System Cla
Page 148 and 149: How You Can Access a Database with
Page 182 and 183: How You Can Manage TransactionsHow
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How Programming for Multiple Sessio
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Handling Database ErrorsIn OpenROAD
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Handling Database ErrorsIf a databa
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Handling Database ErrorsFor example
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Handling Database Errorsbeginerr_no
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Arrays and Table Fields—Conceptua
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ArraysBecause an individual attribu
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ArraysDeclaring an array variable d
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ArraysThe following statement puts
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Arraysfor i = custtable.FirstRow to
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ArraysHow You Can Add Rows to an Ar
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ArraysThe inserted row is blank bec
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ArraysThe following code fragment i
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ArraysThese attributes are:AllRowsR
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ArraysAttributes used in a sort can
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ArraysThe format parameter can be a
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Table FieldsTable Fields and Associ
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Table FieldsThe following applicati
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Table FieldsThis syntax references
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Table FieldsFor example, the follow
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Table Field OperationsTable Field C
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Table Field OperationsHow You Can U
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Table Field OperationsWhen you use
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Table Field OperationsBiases can be
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Table Field OperationsThe following
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Table Field OperationsHow You Can T
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Table Field OperationsTableField Me
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Table Field OperationsFor example,
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Table Field OperationsControlling M
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CollectionsCollectionsA collection
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Collections// Open a workbook and p
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Listview_Treeview_DemoImport the De
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Listview FieldsListview FieldsA lis
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Listview FieldsextensionSpecifies a
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Listview FieldsImageIndexSpecifies
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TreeNode and Tree ClassesHeaderClic
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TreeNode and Tree ClassesMaintenanc
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Treeview FieldsHow You Can Build a
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Treeview FieldsThe second window is
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Treeview FieldsThe tree_ex2_class h
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Chapter 9: Working with Images and
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How You Can Work with ImagesThe fol
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How You Can Work with ImagesThe Col
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How You Can Work with ImagesThe Bit
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How You Can Work with Images5. Add
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How You Can Work with Text StringsD
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How You Can Work with Text StringsH
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How You Can Call 3GL ProceduresIn t
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How You Can Use Exec 4GL Statements
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How You Can Link 3GL ProceduresHow
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Sample 3GL ProceduresExec 4GL and E
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How You Can Use Data Entry Error Ha
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Chapter 12: Managing Event QueuesTh
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Event-based ProgrammingThe followin
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Event-based ProgrammingEvent TypesT
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Event-based ProgrammingField Events
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Event-based ProgrammingBecause all
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Event-based ProgrammingThe followin
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Event-based ProgrammingThe resume s
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Event-based ProgrammingNote: The da
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Communicating Between OpenROAD Fram
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How You Can Communicate with an Ext
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How You Can Communicate Between Ope
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How You Can Communicate Between Ope
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Chapter 14: Creating Dynamic Frames
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How You Can Change Field and Frame
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How You Can Create and Modify Field
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How You Can Remove Fields Dynamical
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How You Can Declare a Composite Fie
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How You Can Manipulate Data in Dyna
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How You Can Manage Operations with
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How You Can Build a Frame Dynamical
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Dynamic Statements ConsiderationsDy
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How You Can Write an AssistantNote:
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How You Can Write an AssistantFirst
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How You Can Write an AssistantBecau
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How You Can Ensure Compatibility Be
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Chapter 17: Preprocessing Your 4GL
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PreprocessorGeneral Preprocessor St
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PreprocessorThe #define StatementTh
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Error ProcessingGuidelines for Usin
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Chapter 18: Debugging Your Applicat
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How You Can Test an ApplicationHow
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How You Can Use Break ConditionsTo
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How You Can Use Break Conditions3.
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How You Can Use Break ConditionsWay
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How You Can Use Break ConditionsSet
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How You Can Use Break Conditions•
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How You Can Use Break ConditionsMet
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How You Can Log Trace InformationDa
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How You Can Monitor a Running Appli
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How You Can Monitor a Running Appli
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How You Can Debug Database QueriesT
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How Debugging an Application WorksS
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How Debugging an Application WorksH
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How Debugging an Application WorksW
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How Debugging an Application WorksH
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How Debugging an Application WorksW
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How Debugging an Application WorksL
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How Debugging an Application WorksA
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Appendix A: SQL Syntax SummaryThis
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SQL Syntax Summarygrant all [privil
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OpenSQL Syntax SummaryOpenSQL Synta
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Operating System CommandsThe follow
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BitmapObject classThe BitmapObject
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external classAn external class def
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local variableLocal variables conta
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StringObject classThe StringObject
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Index'' ' (single quotation marks)c
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Attributesdefined • 28referencing
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using to copy data • 244using wit
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application threads • 444array di
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examining values • 473hexadecimal
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Gmoney • 51numeric list • 53pad
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Namesapplication • 21dynamic •
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ReadOps attributesettings • 243Re
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concat function • 54functions •
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event chains • 323event queue •
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