Help Center/ GaussDB/ Developer Guide(Centralized_V2.0-3.x)/ Application Development Guide/ ECPG-based Development/ Running SQL Commands/ Embedded SQL Commands/ VAR
Updated on 2025-08-19 GMT+08:00
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VAR

Function

Assigns a new C data type to a host variable. The host variable must have been declared in a DECLARE segment.

  • Exercise caution when using VAR. Using VAR to change the data type my cause the memory address to be invalid. As a result, the data variable is invalid and the value cannot be assigned.
  • If the data type has been defined in the host variable DECLARE segment, you do not need to use the VAR statement.

Syntax

VAR varname IS ctype

Parameters

  • varname

    Name of a C variable.

  • ctype

    C type description.

Examples

EXEC SQL BEGIN DECLARE SECTION; 
    short a;
EXEC SQL END DECLARE SECTION;
EXEC SQL VAR a IS int;
Parent topic: Embedded SQL Commands