Openedge Data Management: SQL Reference - Product ...

ESQL elements and statements
Examples
324
query_expression [ ORDER BY clause ] [FOR UPDATE clause ]
A complete query expression.
prepared_statement_name
The name assigned to a prepared SQL statement in an earlier PREPARE statement.
EXEC SQL WHENEVER SQLERROR GOTO selerr ;
EXEC SQL DECLARE stcur CURSOR FOR
SELECT InvTransNum, Qty, OrderNum FROM PUB.InventoryTrans ;
EXEC SQL OPEN stcur ;
EXEC SQL WHENEVER NOT FOUND GOTO seldone ;
EXEC SQL WHENEVER SQLERROR GOTO selerr ;
EXEC SQL PREPARE stmtid from :sel_stmt_v ;
EXEC SQL DECLARE dyncur CURSOR FOR stmtid ;
EXEC SQL OPEN dyncur ;
EXEC SQL WHENEVER NOT FOUND GOTO seldone ;
Notes • You must declare a cursor before any OPEN, FETCH, or CLOSE statement.
• The scope of the cursor declaration is the entire source file in which it is declared. The
operations on the cursor, such as OPEN, CLOSE, and FETCH statements, can occur only within
the same compilation unit as the cursor declaration.
• The use of a cursor allows the execution of the positioned forms of the UPDATE and DELETE
statements.
• If the DECLARE statement corresponds to a static SQL statement with parameter references:
– The DECLARE statement must be executed before each execution of an OPEN statement
for the same cursor.
– The DECLARE statement and the OPEN statement that follows must occur within the
same transaction within the same task.
– If the statement contains parameter references to automatic variables or function
arguments, the DECLARE statement and the following OPEN statement for the same
cursor must occur within the same C function.
Authorization
None
Related statements
PREPARE, OPEN, FETCH, CLOSE SELECT