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Indicator variables are C variables that hold 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 a_sql_len that is placed immediately following a regular host variable in a SQL statement. To detect or specify a NULL value, place the indicator variable immediately following a regular host variable in a SQL statement.
To allow for the future use of 32 and 64-bit lengths and indicators, the use of short int for embedded SQL indicator variables is deprecated. Use a_sql_len instead.
Using indicator variables to handle NULL
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