Programming Guide - Actian

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How You Can Access a Database with DataStream Objectsif (status != ER_OK) then/* There was an error. */rollback;/* Notify user of error. */...resume;endif;commit;if (ss.ErrorNo != 0 and ss.IsDBError = TRUE) then/* There was a database error */rollback;/* Notify user of error. */...resume;endif;The value returned by the Open method is ER_OK if no errors occur inexecuting the query. If no errors have occurred, the example code commitsthe transaction opened by executing the query.Like any SQL statement, SQLSelect objects (and QueryObject objects)participate in a transaction. Because closing the SQLSelect object does notclose the transaction, your application must explicitly commit or roll back thetransaction.Because all the data retrieval is done at once when the Open method isinvoked, the code in the previous example commits the transactionimmediately.After committing the transaction, the sample code checks for errors using thefollowing DataStream attributes:ErrorNoProvides the error number of the last operation, generated either by:• The DBMS—for example, a column specified as a target does not existin the table• The application—for example, the 4GL code provides an illegal scope orcontains expressions that do not compileIsDBErrorSet to TRUE if the error is a DBMS error.If the SQLSelect has been opened successfully, this frame uses theSQLSelect's MaxRow attribute to determine the next operation. TheMaxRow attribute contains the number of rows retrieved. If the value ofthe MaxRow attribute is not zero, you can invoke the NextRow and Loadmethods to retrieve data.172 <strong>Programming</strong> <strong>Guide</strong>
How You Can Access a Database with DataStream ObjectsThe following code performs these operations:if (MaxRow > 0) thenstatus = ss.NextRow();status = ss.Load();endif;How You Can Get Next and Previous RowsBecause the ss SQLSelect object was opened in QY_CACHE mode, datawas retrieved from the database table into the cache. The data is notdirectly displayed on the form. Therefore, the example code invokes theNextRow method to move the next row (in this case the first row) from thecache to internal buffers, and the Load method to move it from internalbuffers to fields (or variables) in the frame.Suppose that your frame has buttons labeled Next and Previous. The followingcode shows how you can use these buttons to fetch the next and previousrows:/*** Initialize the buttons.*/if (ss.CurRow >1) thenfield(prev_btn).CurBias = FB_CHANGEABLE;elseendif;field(prev_btn).CurBias = FB_DIMMED;if (ss.CurRow = ss.MaxRow) thenfield(next_btn).CurBias = FB_DIMMED);endif;field(prev_btn).CurBias = FB_CHANGEABLE;Working with a Database 173
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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
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
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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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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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