Programming Guide - Actian

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How You Can Build a Frame DynamicallyHow Generating the Frame Source Code WorksPart of the source code for the generated frame was written in the select loopthat constructed the fields. The next section of the DynamicFrame frame scriptcreates the generated frame's source code from the strings constructed in theselect loop.The starting frame uses the following steps to create the generated frame'ssource code:1. Creates the string object to hold the completed script and assigns it to theScript attribute of the FrameSource:test_frame.Script = StringObject.Create();2. Constructs the script, creating an initialize block and event code for fiveClick events that correspond to the five MenuButton objects constructedearlier in the program (Commit, Rollback, Delete, Update, and Next).The example frame uses the ConcatVarchar method (defined for theStringObject class) to concatenate the various pieces of the initializestatement and each event block into one large string. The ConcatVarcharmethod appends the string specified by the text parameter to theStringObject and returns a reference to the original StringObject.The following code constructs the script for the generated frame:/* Set up the initialize block */test_frame.Script.ConcatVarchar(text ='initialize (table_cursor = CursorObject)=' + HC_NEWLINE + HC_TAB + 'begin' +HC_NEWLINE + HC_TAB + HC_TAB + selectstring +HC_NEWLINE);test_frame.Script.ConcatVarchar(text = HC_TAB + HC_TAB +selectupdatestring + HC_NEWLINE + HC_TAB +HC_TAB + 'CurFrame.SendUserEvent(eventname = ''Next'');' +HC_NEWLINE + HC_TAB + 'end;' +HC_NEWLINE + HC_NEWLINE);/* Set up the file.commit script */test_frame.Script.ConcatVarchar(text ='on click file_menu.commit_menu = ' +HC_NEWLINE + HC_TAB +'begin' + HC_NEWLINE +HC_TAB + HC_TAB + 'close table_cursor;' +HC_NEWLINE + HC_TAB + HC_TAB + 'commit work;'+ HC_NEWLINE + HC_TAB + HC_TAB + 'return;' +HC_NEWLINE + HC_TAB + 'end;' +HC_NEWLINE + HC_NEWLINE);414 <strong>Programming</strong> <strong>Guide</strong>
How You Can Build a Frame Dynamically/* Set up the file.rollback script */test_frame.Script.ConcatVarchar(text =on click file_menu.rollback_menu =' + HC_NEWLINE + HC_TAB + 'begin' +HC_NEWLINE + HC_TAB + HC_TAB + 'closetable_cursor;' + HC_NEWLINE + HC_TAB + HC_TAB+ 'rollback work;' + HC_NEWLINE + HC_TAB+ HC_TAB + 'return;' + HC_NEWLINE + HC_TAB +'end;' + HC_NEWLINE + HC_NEWLINE);/* Set up the edit.delete script */test_frame.Script.ConcatVarchar(text ='on click edit_menu.delete_menu =' + HC_NEWLINE + HC_TAB +'begin' + HC_NEWLINE+ HC_TAB + HC_TAB + 'delete from ' +table_choices + ' where current oftable_cursor;' + HC_NEWLINE+ HC_TAB + HC_TAB +'CurFrame.SendUserEvent(eventname =''Next'');' + HC_NEWLINE+ HC_TAB + 'end;' +HC_NEWLINE + HC_NEWLINE);/* Set up the edit.update script */test_frame.Script.ConcatVarchar(text ='on click edit_menu.update_menu = ' +HC_NEWLINE + HC_TAB + 'begin' + HC_NEWLINE +HC_TAB + HC_TAB + updatestring +HC_NEWLINE + HC_TAB + HC_TAB + ' wherecurrent of table_cursor;'+ HC_NEWLINE + HC_TAB + HC_TAB +'CurFrame.SendUserEvent(eventname = ''Next'');' + HC_NEWLINE+ HC_TAB + 'end;' + HC_NEWLINE + HC_NEWLINE);/* Set up the edit.next script */test_frame.Script.ConcatVarchar(text ='on click edit_menu.next_menu,' +HC_NEWLINE + 'on userevent ''Next'' =' +HC_NEWLINE + HC_TAB + 'begin' +HC_NEWLINE + HC_TAB + HC_TAB +fetchstring + HC_NEWLINE + HC_TAB + HC_TAB +'if table_cursor.State = CS_NO_MORE_ROWSthen'+ HC_NEWLINE + HC_TAB + HC_TAB + HC_TAB+ 'message ''No more rows.'';' + HC_NEWLINE+ HC_TAB + HC_TAB + 'endif;' + HC_NEWLINE +HC_TAB + 'end;' + HC_NEWLINE + HC_NEWLINE);3. To facilitate debugging, writes the completed script to a file using theWriteToFile method (defined for the StringObject class):test_frame.Script.WriteToFile("test.script");The WriteToFile method invoked in the preceding example creates a filenamed test.script.Creating a Frame at Runtime 415
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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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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
Page 363 and 364: Chapter 14: Creating Dynamic Frames
Page 365 and 366: How You Can Change Field and Frame
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Page 418 and 419: Dynamic Statements ConsiderationsDy
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Page 422 and 423: How You Can Write an AssistantFirst
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Page 435 and 436: PreprocessorGeneral Preprocessor St
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Page 439 and 440: Error ProcessingGuidelines for Usin
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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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