• Object Management Extension User Guide
  • Introduction
    • Audience
    • In This Guide
    • System-specific Text in This Guide
    • Terminology Use in This Guide
    • Syntax Conventions Used in This Guide
  • Introducing Object Management Extension
    • In This Chapter
    • What Is Object Management Extension?
      • Structure and Symbol Definitions
      • Demonstration Data Types
    • How You Add Data Types and Functions
      • Required Contents of the Code
      • Data Type Definitions
      • Function Definitions
      • Function Instance Definitions
      • Coercion Routines
      • Installation and Testing of the New Code
    • Object Management Extension Restrictions
  • Understanding DBMS Server Requirements for User-Defined Data Types
    • In This Chapter
    • How the DBMS Server Uses the Code
    • Requirements for User-written Code
    • Requirements for Data Type Coercion
    • IDs for Data Types and Functions
    • User-defined Data Types and the Copy Statement
    • Large Objects
  • Defining Data Types
    • In This Chapter
    • Data Type Definition
    • Structure IIADD_DT_DFN Fields
    • Required Routines for Data Type Definition
      • Function Parameters
      • Structure scb_error
      • Structure II_DATA VALUE
      • The Structure of db_data
        • Internal Structure of a Decimal Value
    • compare Routine--Compare Two Data Elements
      • Inputs
      • Outputs
      • Returns
    • dbtoev Routine--Determine External Data Type
      • Inputs
      • Outputs
      • Returns
    • dhmax Routine--Create Default Maximum Histogram Value
      • Inputs
      • Outputs
      • Returns
    • dhmin Routine--Create Default Minimum Histogram Value
      • Inputs
      • Outputs
      • Returns
    • getempty Routine--Get an Empty Value
      • Inputs
      • Outputs
      • Returns
    • hashprep Routine--Prepare Value for Hash Key
      • Inputs
      • Outputs
      • Returns
    • helem Routine--Create a Histogram Element for Data Value
      • Inputs
      • Outputs
      • Returns
    • hg_dtln Routine--Provide Type and Length for Histogram Value
      • Inputs
      • Outputs
      • Returns
    • hmax Routine--Create Histogram Value for Maximum Value
      • Inputs
      • Outputs
      • Returns
    • hmin Routine--Create Histogram Value for Minimum Value
      • Inputs
      • Outputs
      • Returns
    • keybuild Routine--Build a Key from the Value
      • Inputs
      • Outputs
      • Returns
    • length_check Routine--Check for Valid Length
      • Inputs
      • Outputs
      • Returns
    • minmaxdv Routine--Provide Min/Max Values and Lengths
      • Inputs
      • Outputs
      • Returns
    • seglen Routine--Determine Length of Each Long Segment
      • Inputs
      • Outputs
      • Returns
    • tmcvt Routine--Convert Data Type to Displayable Format
      • Inputs
      • Outputs
      • Returns
    • tmlen Routine--Determine Display Length
      • Inputs
      • Outputs
      • Returns
    • value_check Routine--Check for Valid Values
      • Inputs
      • Outputs
      • Returns
    • xform Routine--Transform Long Types into Segments
      • Inputs
      • Outputs
      • Returns
  • Defining Functions
    • Required Definitions
    • Structure IIADD_FO_DFN
  • Defining Function Instances
    • Function Instance Definition
    • Structure IIADD_FI_DFN
    • Length Definition of Result Data Type
    • External Lenspec Routine--Return Result Length of Specified Value
    • Complementary Function Instances
    • Sorting of the Function Instance Definition Array
    • Methods for Defining Function Instances for Large Objects
    • Ingres-supplied Filter Functions
      • Direct Manipulation of Large Objects
    • II_INFORMATION Operation--Return Maximum Length of Peripheral Object Segments
      • Inputs
      • Outputs
      • Returns
    • II_GET Operation--Get Next Segment
      • Inputs
      • Outputs
      • Returns
    • II_PUT Operation--Add a New Segment
      • Inputs
      • Outputs
      • Returns
    • II_COPY Operation--Move a Peripheral Object
      • Inputs
      • Outputs
      • Returns
  • Passing Definitions to the DBMS Server
    • IIudadt_register Routine
    • Structure IIADD_DEFINITION Fields
    • Server Routines Provided
      • The ii_cb_trace Routine--Output Provided Trace Messages
      • The ii_error_fcn Routine--Place Error Information in Status Control Block
      • The ii_lo_handler_fcn Routine--Move Through Large Object Segments
      • The ii_init_filter_fcn Routine--Set Up Filter Function
      • The ii_filter_fcn Routine--Perform Operation by Calling a User Routine
  • Installing and Testing Data Types
    • In This Chapter
    • How You Install New Data Types in a Windows Environment
    • How You Install New Data Types in a VMS Environment
      • Template Command File--Create the Shared Image
      • II_USERADT Logical--Set Disk Location of the Shared Image
        • Definition of II_USERADT in a Test Installation
    • How You Install New Data Types in a UNIX Environment
    • Testing the New Data Type Code
  • Writing Aggregate Functions
    • In This Chapter
    • Aggregate Function
    • Function Definitions for Aggregates
    • Code for an Aggregate Function
  • A. Checklist for Creating Data Types
    • How You Create Data Types in Windows
    • How You Create Data Types in UNIX
    • How You Create Data Types in VMS

Object Management Extension User Guide

How You Create Data Types in VMS