Navigation :

DECLARE

DECLARE
Prev Up 36.14. Embedded SQL Commands Home Next

DECLARE

DECLARE - define a cursor

Synopsis 

DECLARE cursor_name [ BINARY ] [ ASENSITIVE | INSENSITIVE ] [ [ NO ] SCROLL ] CURSOR [ { WITH | WITHOUT } HOLD ] FOR prepared_name
DECLARE cursor_name [ BINARY ] [ ASENSITIVE | INSENSITIVE ] [ [ NO ] SCROLL ] CURSOR [ { WITH | WITHOUT } HOLD ] FOR query

Description

DECLARE declares a cursor for iterating over the result set of a prepared statement. This command has slightly different semantics from the direct SQL command DECLARE : Whereas the latter executes a query and prepares the result set for retrieval, this embedded SQL command merely declares a name as a " loop variable " for iterating over the result set of a query; the actual execution happens when the cursor is opened with the OPEN command.

Parameters

cursor_name #

A cursor name, case sensitive. This can be an SQL identifier or a host variable.

prepared_name #

The name of a prepared query, either as an SQL identifier or a host variable.

query #

A SELECT or VALUES command which will provide the rows to be returned by the cursor.

For the meaning of the cursor options, see DECLARE .

Examples

Examples declaring a cursor for a query: 

EXEC SQL DECLARE C CURSOR FOR SELECT * FROM My_Table;
EXEC SQL DECLARE C CURSOR FOR SELECT Item1 FROM T;
EXEC SQL DECLARE cur1 CURSOR FOR SELECT version();

An example declaring a cursor for a prepared statement: 

EXEC SQL PREPARE stmt1 AS SELECT version();
EXEC SQL DECLARE cur1 CURSOR FOR stmt1;

Compatibility

DECLARE is specified in the SQL standard.

Prev Up Next
DEALLOCATE DESCRIPTOR Home DECLARE STATEMENT