One of the most significant features of Sybase Adaptive Server Enterprise is database stored procedures. You can use database stored procedures for:
Retrieval only
Update only
Update and retrieval
PowerBuilder supports all these uses in embedded SQL.
The setting of the AutoCommit property of the transaction object determines whether PowerBuilder issues SQL statements inside or outside the scope of a transaction. When AutoCommit is set to false or 0 (the default), SQL statements are issued inside the scope of a transaction. When you set AutoCommit to true or 1, SQL statements are issued outside the scope of a transaction.
Adaptive Server Enterprise requires you to execute Data Definition Language (DDL) statements outside the scope of a transaction unless you set the database option “ddl in tran” to true. If you execute a database stored procedure that contains DDL statements within the scope of a transaction, an error message is returned and the DDL statements are rejected. When you use the transaction object to execute a database stored procedure that creates a temporary table, you do not want to associate the connection with a transaction.
To execute Adaptive Server Enterprise stored procedures containing DDL statements, you must either set “ddl in tran” to true, or set AutoCommit to true so PowerBuilder issues the statements outside the scope of a transaction. However, if AutoCommit is set to true, you cannot issue a ROLLBACK. Therefore, you should set AutoCommit back to false (the default) immediately after completing the DDL operation.
When you change the value of AutoCommit from false to true, PowerBuilder issues a COMMIT statement by default.
Transaction statements in database stored procedures are not honored when the stored procedure is executing within the scope of a transaction. For example, a ROLLBACK statement will not be honored if the following are all true:
The AutoCommit property is FALSE (process transactions normally) when the transaction is connected.
The database stored procedure executes using a transaction.
The procedure contains a ROLLBACK statement.
You should use alternative means to execute the ROLLBACK. For example, you can use return values as described in the information about triggers in Transaction management statements (Sybase Adaptive Server Enterprise Transaction management statements).
