PostgreSQL
Synopsis
SET DESCRIPTOR descriptor_name descriptor_header_item = value [, ... ]
SET DESCRIPTOR descriptor_name VALUE number descriptor_item = value [, ...]Description
SET DESCRIPTOR populates an SQL descriptor area with values. The descriptor area is then typically used to bind parameters in a prepared query execution.
This command has two forms: The first form applies to the descriptor “[.quote]#header”#, which is independent of a particular datum. The second form assigns values to particular datums, identified by number.
Parameters
- `descriptor_name`
-
A descriptor name.
- `descriptor_header_item`
-
A token identifying which header information item to set. Only
COUNT, to set the number of descriptor items, is currently supported. - `number`
-
The number of the descriptor item to set. The count starts at 1.
- `descriptor_item`
-
A token identifying which item of information to set in the descriptor. See Section 36.7.1 for a list of supported items.
- `value`
-
A value to store into the descriptor item. This can be an SQL constant or a host variable.
Examples
EXEC SQL SET DESCRIPTOR indesc COUNT = 1;
EXEC SQL SET DESCRIPTOR indesc VALUE 1 DATA = 2;
EXEC SQL SET DESCRIPTOR indesc VALUE 1 DATA = :val1;
EXEC SQL SET DESCRIPTOR indesc VALUE 2 INDICATOR = :val1, DATA = 'some string';
EXEC SQL SET DESCRIPTOR indesc VALUE 2 INDICATOR = :val2null, DATA = :val2;