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An indicator variable is a C variable that holds supplementary information about a particular host variable. You can use a host variable when fetching or putting data. Use indicator variables to handle NULL values.
An indicator variable is a host variable of type short int. To detect or specify a NULL value, place the indicator variable immediately following a regular host variable in a SQL statement.
For example, in the following INSERT statement, :ind_phone is an indicator variable.
EXEC SQL INSERT INTO Employee VALUES (:employee_number, :employee_name, :employee_initials, :employee_phone:ind_phone );
The following table provides a summary of indicator variable usage:
|Indicator value||Supplying value to database||Receiving value from database|
|0||Host variable value||Fetched a non-NULL value.|
|-1||NULL value||Fetched a NULL value|
Using indicator variables to handle NULL
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