Programming Guide - Actian

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Compiler LimitationsCompiler LimitationsA compilation unit (that is, an entire 4GL source file, including all its includedfiles) should not contain more than:• 2728 blocksEach of these items constitutes a block: the compilation unit itself, eachfield script, event block or initialize block with a declare statement, localprocedure, or method.• 32767 integer literalsThis limit includes integer literals generated internally by the 4GL compiler.• 32767 floating-point literals• 32767 string literals inside expressions• 32767 string literals outside expressionsThis limit includes string literals generated internally by the 4GL compiler.A single execution unit, a local procedure, method, global procedure (excludingits local procedures) or frame (excluding its local procedures), should notcontain more than 32767 variables. This limit includes temporary variablesgenerated internally by 4GL.The OpenROAD compiler imposes a limit on the complexity of a singleexpression. The limit may be violated in complex conditions of if, for, and whilestatements, especially if the condition contains several groups of comparisonsthat have both AND and OR clauses. For example, a statement like thefollowing can cause a compilation error if there is insufficient memory:if a = 't' and b = 'h' and c = 'e' and d = 'n'or a = 'w' and b = 'a' and c = 'n' and d = 'q'or a = 's' and b = 'g' and c = 'r' and d = 'k'or a = 't' and b = 'h' and c = 'e' and d = 'n'thencallproc found_it;endif;92 <strong>Programming</strong> <strong>Guide</strong>
Compiler LimitationsYou can avoid the compilation error by splitting the complex if statement intomultiple if and elseif statements. For example:f = false;if a = 't' and b = 'h' and c = 'e' and d = 'n'then f = true;elseif a = 'w' and b = 'a' and c = 'n' and d = 'q'then f = true;elseif a = 's' and b = 'g' and c = 'r' and d = 'k'then f = true;elseif a = 't' and b = 'h' and c = 'e' and d = 'n'then f = true;endif;if f = true thencallproc found_it;endifWriting Scripts and Procedures 93
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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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Page 44 and 45: ExpressionsOperatorlikenot likeOper
Page 46 and 47: Expressions• You can use the esca
Page 48 and 49: ExpressionsBecause procedures can r
Page 50 and 51: System-defined FunctionsThis rule h
Page 52 and 53: System-defined FunctionsNameOperand
Page 54 and 55: System-defined FunctionsName Operan
Page 56 and 57: System-defined FunctionsNameshift(c
Page 58 and 59: System-defined FunctionsSome date f
Page 60 and 61: System-defined FunctionsThe followi
Page 62 and 63: System-defined FunctionsCount Funct
Page 64 and 65: System-defined FunctionsResult Data
Page 67 and 68: Chapter 3: Writing Scripts and Proc
Page 69 and 70: ScriptsDeclare local variables that
Page 71 and 72: ScriptsUserEventSpecifies a user ev
Page 73 and 74: ScriptsExample—Field and Menu Ite
Page 75 and 76: ProceduresOpenROAD lets you create
Page 77 and 78: ProceduresReturning from a Procedur
Page 79 and 80: ProceduresExample—Local Procedure
Page 81 and 82: Procedures4GL DataTypedatemoneyfloa
Page 83 and 84: Calling Procedures• In this call
Page 85 and 86: Calling ProceduresparameterAssigns
Page 87 and 88: How Procedure Handles Work (ProcHan
Page 89 and 90: How Procedure Handles Work (ProcHan
Page 91: How Procedure Handles Work (ProcHan
Page 96 and 97: How You Can Invoke FramesHow the Cu
Page 98 and 99: How You Can Invoke FramesHow You Ca
Page 100 and 101: How You Can Invoke FramesFor more i
Page 102 and 103: How You Can Invoke FramesFor exampl
Page 104 and 105: How You Can Invoke FramesIf the obj
Page 106 and 107: How You Can Invoke FramesHow You Ca
Page 108 and 109: How You Can Invoke Frames• Prompt
Page 110 and 111: How You Can Invoke FramesThe syntax
Page 112 and 113: How You Can Run Non-interactive App
Page 114 and 115: How You Can Reference ObjectsHow Yo
Page 116 and 117: How You Can Reference ObjectsHow Yo
Page 118 and 119: 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
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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
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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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Programming Guide - Actian

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