Micro Focus Enterprise Developer 3.0 for Visual Studio 2013 > Programming > Mainframe Programming > SQL Option for DB2 > Reference > SQL Reference > SQL Statements > BEGIN DECLARE SECTION

BEGIN DECLARE SECTION

The BEGIN DECLARE SECTION statement (embedded SQL only) marks the beginning of a host variable declare section in an application program.

Invocation

BEGIN DECLARE SECTION is not an executable statement. It can only be embedded in a host language.

Authorization

No special authorization is required.

Syntax

BEGIN DECLARE SECTION

Description

BEGIN DECLARE SECTION may be used in an application program to mark the beginning of the section of code where host variables are declared. If a BEGIN DECLARE SECTION is used, the host variable declaration section must end with the END DECLARE SECTION statement.

When programming in C, or when the DECLARE or ANSI COBOL preprocessor directives are used, BEGIN and END DECLARE SECTION commands must surround the declarations for all host variables, to create host variable declaration blocks. As illustrated in the COBOL example below, a host variable declaration block can appear anywhere that the host language allows variable declarations:

EXEC SQL BEGIN DECLARE SECTION; 
        short int cust_num = 28; 
        char name[30];
EXEC SQL END DECLARE SECTION;

The following rules are enforced by the precompiler, only if C is the host language, or if the DECLARE or ANSI COBOL precompiler option is specified:

Variables referenced within SQL statements must be declared within the variable declaration section of the host program.
There must be a paired set of BEGIN DECLARE SECTION and END DECLARE SECTION statements.

Note:

Only if the DECLARE or the ANSI COBOL precompiler directive is specified or the host language is C, are host variable declaration sections required. Any source program, in any host language, can be made to conform to the SAA definition of SQL by specifying a declare section. If variable declaration sections are used when they are not required, all variables declared outside the declare section must have a name different from all variable names declared within the declare section.