Programming Guide - Actian

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How You Can Access a Database with DataStream ObjectsHow You Can Run the SQLSelect QueryTo execute the query after specifying it, invoke the Open method. If you openthe SQLSelect object in QY_ARRAY mode, each column's value goes directly tothe Expression attribute of the SQLSelect object's target array. If you mappedthe Expression attribute for each column to a specific field on the form, eachcolumn's value is displayed on the form.If, however, you open the SQLSelect object in any mode but array mode, thefollowing additional methods are required to display the data:NextRowLoadRetrieves the data row by row from the database into internal buffersMoves data from the internal buffers into the target fields on the formOpening an SQLSelect object requires setting several parameters in addition tospecifying the query mode. The Open method has the following parameters:QueryModeData Type: integer(Required.) Specifies one of the following modes:• QY_ARRAY• QY_CACHE• QY_CURSOR• QY_DIRECTDefault: NoneCheckColsData Type: integer(Optional.) Checks the number of columns specified in the Query text withthe number of columns in the Columns array. When FALSE, populatescolumns in the Columns array if they have not been explicitly set.Default: FALSEIsRepeatedData Type: integer(Optional.) Specifies whether to make a repeat query. Set to TRUE tomake a repeat query.Default: FALSE170 <strong>Programming</strong> <strong>Guide</strong>
How You Can Access a Database with DataStream ObjectsMaxRowsScopeData Type: integer(Optional.) Specifies a maximum number of array rows to populate (ifgreater than 0). Exceeding MaxRows causes an error (applies only toQY_ARRAY mode).Default: 0Data Type: Scope(Required.) Specifies the scope for evaluation of expressions in theColumns array Targets attribute.Default: Value of the current Scope attributeIt is always necessary to set the scope for an SQLSelect object or QueryObjectobject. Scope can be set as a parameter to the Open method or by setting theDataStream's Scope attribute directly. The following code sets the SQLSelectobject's Scope attribute to the scope of the current frame:ss.Scope = CurFrame.Scope;if ss.Scope != CurFrame.Scope then/* error */endif;Note: Because setting the scope causes compilation of expressions in theSQLSelect object, errors during compilation could prevent the scope fromsetting as expected. It is recommended, therefore, that you check forappropriate setting of the scope while you are developing the application andmake the necessary changes to your 4GL code.Rather than setting the scope by setting the Scope attribute, you can set itusing the Open method. The following code opens the SWLSelect object incache mode, with CheckCols set to TRUE, and specifies the current frame asthe scope:status = ss.Open(querymodecheckcolscope);= QY_CACHE,= TRUE,= CurFrame.ScopeWorking with a Database 171
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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
Page 120 and 121: Using an Object-oriented Approach t
Page 122 and 123: InheritanceClass RelationshipsYou c
Page 124 and 125: InheritanceYou can specify a user c
Page 126 and 127: InheritanceThe Terminate method is
Page 128 and 129: How You Can Create a User ClassWhen
Page 130 and 131: How You Can Create a User ClassHow
Page 132 and 133: How You Can Create a User Class3. G
Page 134 and 135: How You Can Create a User ClassTo e
Page 136 and 137: External ClassesHow You Can Use Ext
Page 138 and 139: External ClassesExample—ActiveX C
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
Page 184 and 185: How You Can Manage TransactionsDivi
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Page 188 and 189: How Programming for Multiple Sessio
Page 198 and 199: Handling Database ErrorsIn OpenROAD
Page 200 and 201: Handling Database ErrorsIf a databa
Page 202 and 203: Handling Database ErrorsFor example
Page 204 and 205: Handling Database Errorsbeginerr_no
Page 206 and 207: Arrays and Table Fields—Conceptua
Page 208 and 209: ArraysBecause an individual attribu
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Page 216 and 217: ArraysHow You Can Add Rows to an Ar
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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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