N.2 Procedures and Modes

N.2.1 Using Stored Procedure sp_proxmode

The preferred way to avoid errors 7112 and 7113 is to alter all stored procedures invoked directly or indirectly by the driver (via triggers, for example) to run in both chained and unchained mode. To alter a procedure, invoke the sp_procxmode procedure with two arguments:.

  • The procedure name

  • The mode

The following example illustrates how to invoke the sp_procxmode procedure from the isql command line:

client:sp_procxmode my_procedure, anymode go

Of course, not all customers are willing to alter stored procedure modes. Altering a procedure's mode might alter its runtime behavior, which could alter the behavior of other applications that invoke the procedure.

N.2.2 Chained and Unchained Modes

Unchained mode is Sybase's native way of executing SQL. A second mode, chained mode, was later added to make the database compatible with SQL standards.

Table N-1 Modes and Compatibility

Mode

Compatibility

Chained

SQL-compatible mode

Unchained

Sybase native mode

Sybase provides a third-party JDBC driver called jConnect. The default mode of jConnect is unchained. Whenever the method Connection.setAutoCommit(boolean autoCommit):void is invoked, jConnect switches modes. See java.sql Interface Connection.

Table N-2 Methods and Switches

Method

Effect

Connection.setAutoCommit(true)

Switches to unchained mode

Connection.setAutoCommit(false)

Switches to chained mode

If the Use Manual Transactions? parameter is set to False, the driver invokes Connection.setAutoCommit(true). That is, the driver enters unchained mode. This is the normal processing mode for SELECT statements and SQL embedded in a policy where the transaction type is set to auto. See Section 11.5, Manual vs. Automatic Transactions. When the driver is in this state, any chained stored procedures invoked directly or indirectly by the driver yield the 7112 error.

If the Use Manual Transactions? parameter is set to True, the driver invokes Connection.setAutoCommit(false). That is, the driver enters chained mode. This is the normal processing mode for all statements except SELECT statements and SQL embedded in a policy where the transaction type is set to manual. See Section 11.5, Manual vs. Automatic Transactions. When the driver is in this state, any unchained stored procedures invoked directly or indirectly by the driver yield the 7113 error.

N.2.3 Managing Transactions in a Policy

For information on managing transactions in a policy, see Section 11.5, Manual vs. Automatic Transactions

N.2.4 Useful Links