Calling Oracle function in JDBC

Question

Hi,
The function in Oracle is defined as
FUNCTION SETUP RETURNS BOOLEAN
Argument Name Type In/Out Default?
PI_NE_ID NUMBER IN
PI_PI_AID VARCHAR2 IN
PI_ATTR_NAME_LIST_ID VARCHAR2 IN
PI_NETYPE VARCHAR2 IN DEFAULT
PI_CLLI VARCHAR2 IN DEFAULT
DI_CATEGORY VARCHAR2 IN/OUT
MSG VARCHAR2 IN/OUT
My code in Java is
CallableStatement stmt = con.prepareCall("{? = call ges.
Setup(?,?,?,?,?,?,?)}");
System.out.println( " formed call statement" );
stmt.setInt( 1, 6);
stmt.setString( 2, "COM-5004" );
stmt.setString( 3, "TS35-COM" );
stmt.setString( 4, "*" );
stmt.setString( 5, "*" );
stmt.setString( 6, "C" );
stmt.setString( 7, msg );
stmt.registerOutParameter( 8, Types.BIT );
stmt.registerOutParameter( 6, Types.VARCHAR );
stmt.registerOutParameter( 7, Types.VARCHAR );
stmt.execute();
I have tried commenting registerOutParameter for 6 and 7. But I get the error
Connectingjava.sql.SQLException: ORA-06550: line 1, column 13:
PLS-00382: expression is of wrong type
ORA-06550: line 1, column 7:
PL/SQL: Statement ignored
Can anybody please tell what is the problem.
I am using JDK1.3.
When I give Type.BOOLEAN instead of BIT I get compilation error.
Thanks
Smitha

Answer 1

Hi Smintha,
Oracle does not support the return of Boolean over JDBC. To work around this problem you have to write a wrapper function around your original function which returns then for example a number value that indicates true or false.
I assume that the reason for not returning boolean values is that Oracle's boolean value is threefold it can either be true, false or null where null is neither success or failure but rather non-existing.
Let me know if you need any further examples about this.
Hope this helps,
Kalle