Programming Guide - Actian

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How You Can Build a Frame DynamicallyThe DynamicFrame frame uses a select loop to process the values returned bythe select statement. The following code adds the column names to the SQLstatement strings that are part of the generated frame's script:begin/* Use the SQL trim function to remove trailing** blanks. */columnname = trim(columnname);columndatatype = trim(columndatatype);/* Add column name to SQL statement strings** being generated */if numcolumns
How You Can Build a Frame DynamicallyThe variable numcolumns, initialized to zero before the select, controls theexecution of this code. If numcolumns is non-positive, the columnnamevariable represents the first row returned by the select statement and the Gooperation executes the code that builds the initial portions of the SQLstatements. The numcolumns variable is incremented with each pass throughthe loop so that subsequent values of the columnname variable are added toan existing string.The variables that hold the character strings representing the SQL statementsare of the data type varchar(2000). The system constants HC_NEWLINE andHC_TAB represent newline and tab characters, respectively. If your statementstrings are longer than 2000 characters, it is preferable to use StringObjectvariables instead of varchar variables.After adding the column name to the statement strings, the Go operationconstructs the field title and the field itself (all of which are entry fields in theexample). The following code creates the field title and attaches it to the form:trim_ptr = FreeTrim.Create();trim_ptr.XLeft = trimleft;trim_ptr.YTop = fieldtop;trim_ptr.TextValue = trim(trim(uppercase(left(columnname,1))) +trim(lowercase(shift(columnname,-1))) + ':');trim_ptr.IsBold = TRUE;trim_ptr.TypeSize = 10;trim_ptr.Width = 33 * widthchar;trim_ptr.Height = heightchar;trim_ptr.ParentField = test_frame.TopForm;Each field's title is an object of the class FreeTrim, which is used only fortextual trim on forms. The previous code defines the trim's position on theform (XLeft and YTop), its actual text value (TextValue), and the appearanceof the text (IsBold, TypeSize, Width, and Height).The code also uses SQL string functions (uppercase and lowercase) to ensurethat the title appears with initial capitalization.Specifying a ParentField attribute for an object identifies which composite fieldcontains that object. Therefore, assigning the form object intest_frame.TopForm to the ParentField attribute of the FreeTrim objectattaches the trim to the form by identifying the form as the composite fieldthat contains the trim.Creating a Frame at Runtime 407
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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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Page 418 and 419: Dynamic Statements ConsiderationsDy
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Page 435 and 436: PreprocessorGeneral Preprocessor St
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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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