Programming Guide - Actian

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How You Can Build a Frame DynamicallyIf your script includes statements that access the database, such as select orupdate, you can use a select statement to retrieve the necessary columnnames for the target lists of the statements and a select loop to build at leastpart of the database statements.Alternatively, you can use a query object to create the target fields andprovide the user with the ability to change the data in the database. For anexample of using a query object to perform these operations, see CreatingDynamic Frames (see page 363).The DynamicFrame frame uses a select loop to obtain information and buildthe target fields and a cursor object to allow the user to make changes to datain the database. For details about the implementation in the DynamicFrameframe, see How You Can Construct the Fields (see page 405) and How You CanComplete the SQL Statements (see page 411).How You Can Attach the Frame to the ApplicationAfter you have completed all of the frame elements and attached them to theframe, you must attach the frame itself to the application by setting theParentApplication attribute of the new frame's FrameSource object. The valueto which you set this attribute must be the same value that is in theParentApplication attribute of the currently executing frame. (The currentlyexecuting frame is a frame of your dynamic application.)To access the ParentApplication attribute of a currently active frame, use theObjectSource attribute of the frame's FrameExec object. Whenever you call oropen a frame, OpenROAD creates a FrameExec object for that instance ofopening or calling. The FrameExec object gives you information about thecurrent state of a running frame. The ObjectSource attribute points to theframe's FrameSource object. The ParentApplication attribute is defined for theFrameSource object.For example, the DynamicFrame frame attaches the generated test_frameframe to the currently executing frame (the starting frame) by assigning thevalue of the ParentApplication attribute of the current frame's FrameSourceobject to the corresponding attribute of the generated frame's FrameSourceobject:test_frame.ParentApplication =CurFrame.ObjectSource.ParentApplication;For an example of attaching a frame to an application, see How You Can Addthe Frame to the Application (see page 416).396 <strong>Programming</strong> <strong>Guide</strong>
How You Can Build a Frame DynamicallyHow You Can Compile and Run the New FrameThis section presents a sample dynamic application that contains two frames,the starting frame and the dynamic frame:• The starting frameThe starting frame is created in OpenROAD Workbench. This framecontains one option field (providing a list of tables) and one menu item,File (with Go and Close submenu options). The following figure illustratesthe dynamic application's starting frame:• The dynamic frameThe frame called by the starting frame is built dynamically and containsone field for every column in the selected table. This frame contains a Filemenu option (with two submenu options: Commit and Close, and Rollbackand Close) and an Edit menu option (with Delete, Update, and Nextsubmenu options). The generated frame lets the user edit the data in thefields, save or cancel changes, or request the next row of retrieved data.The following illustrates the dynamic application's generated frame:All of the application's dynamic work is done in the frame script associatedwith the starting frame. Each of the following subsections describe a portion ofthe starting frame's script and the role that it plays in the dynamic application.Creating a Frame at Runtime 397
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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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How Procedure Handles Work (ProcHan
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Compiler LimitationsYou can avoid t
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How You Can Invoke FramesHow the Cu
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How You Can Invoke FramesHow You Ca
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How You Can Invoke FramesFor more i
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How You Can Invoke FramesFor exampl
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How You Can Invoke FramesIf the obj
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How You Can Invoke FramesHow You Ca
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How You Can Invoke Frames• Prompt
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How You Can Invoke FramesThe syntax
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How You Can Run Non-interactive App
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How You Can Reference ObjectsHow Yo
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How You Can Reference ObjectsHow Yo
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How You Can Reference ObjectsUse an
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Using an Object-oriented Approach t
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InheritanceClass RelationshipsYou c
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InheritanceYou can specify a user c
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InheritanceThe Terminate method is
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How You Can Create a User ClassWhen
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How You Can Create a User ClassHow
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How You Can Create a User Class3. G
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How You Can Create a User ClassTo e
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External ClassesHow You Can Use Ext
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External ClassesExample—ActiveX C
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How You Can Manipulate Objects Gene
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Overview of the OpenROAD System Cla
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How You Can Access a Database with
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How You Can Manage TransactionsHow
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How You Can Manage TransactionsDivi
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How You Can Manage TransactionsTo c
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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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Page 346 and 347: Communicating Between OpenROAD Fram
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Page 435 and 436: PreprocessorGeneral Preprocessor St
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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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