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This book describes how you can use Server Express to create a COBOL application that uses embedded SQL to access a relational database.
Note: Use of COBSQL is only supported for standard procedural COBOL programs. You cannot use COBSQL with Object Oriented COBOL syntax (OO programs) or with nested programs.
This book is for Server Express COBOL programmers who want to create or modify COBOL applications which access relational databases using embedded SQL.
It is assumed that you are already familiar with SQL. You should also be familiar with the relational database you will be accessing, including the configuration of any client software that may be needed.
Part One - Introduction
Chapter One, Introduction, gives a brief overview of embedded SQL and explains how you can build an embedded SQL application.
Chapter Two, Host Variables, describes host variables, host arrays, indicator variables and indicator arrays, and how they are used.
Chapter Three, Data Types, explains which data types are supported and how to map the data types used by a particular database to the correct COBOL picture clause.
Chapter Four, Cursors, details how to declare and open a cursor and how to use it to retrieve data.
Chapter Five, Data Structures, describes the SQLCA (SQL Communications Area) and the SQLDA (SQL Descriptor Area).
Chapter Six, Dynamic SQL, explains how to prepare and execute dynamic SQL.
Part Two - OpenESQL
Chapter Seven, OpenESQL, gives an overview of OpenESQL and how it works.
Part Three - DB2
Chapter Eight, DB2, describes the DB2 ECM and how it is used.
Part Four - COBSQL
Chapter Nine, COBSQL, documents the COBSQL preprocessor explaining how it is used.
Part Five - Appendices
Appendix A, Reserved Keywords, lists the keywords reserved for use by OpenESQL and ODBC.
Appendix B, COBSQL Error Messages, lists current COBSQL messages.
Appendix C, Connect ODBC UNIX Help, provides information on ODBC.
Appendix D, Embedded SQL Statements, lists the syntax and an example for each embedded SQL statement.
Appendix E, The CP Preprocessor, discusses the CP preprocessor.
MERANT was formed by combining Micro Focus and INTERSOLV. All reference to the companies Micro Focus or INTERSOLV in this book should now be taken to mean MERANT. Micro Focus is retained as the family name for the Micro Focus product set produced by MERANT.
The following type styles and conventions have been used in this book:
cat script_name | more
The italic text denotes a variable that you type as part of the command.
column_nameis like the
pattern_value, or is not like the
pattern_value, depending on the absence or presence of the optional word
column_name [NOT] LIKE pattern_value
This paragraph only applies to OpenESQL and not to DB2 or COBSQL.