EclipseLink：调用存储过程的参数数目或类型错误

Question

I'm using EclipseLink for a web project involving EJB 3 and Oracle stored procedures. We're still in the beginning, so I had a simple procedure set up for testing, here's the signature:

p_test.testProcedure(as_param in varchar2)

Here's the code I use to call the procedure, similar to the Using Basic Query API article on Eclipsepedia:

JpaEntityManager jem = (JpaEntityManager) em.getDelegate();

StoredProcedureCall call = new StoredProcedureCall();
call.setProcedureName("p_test.testProcedure");

call.addNamedArgument("param", "param", String.class);

DataReadQuery query = new DataReadQuery();
query.setCall(call);

query.addArgument("param", String.class);

Vector<String> values = new Vector<String>();
values.add("test");

jem.getActiveSession().executeQuery(query, values);

I keep getting this error:

Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.1.1.v20100817-r8050):
org.eclipse.persistence.exceptions.DatabaseException Internal Exception: 
java.sql.SQLException: ORA-06550: line 1, column 7: PLS-00306: wrong number or types of 
arguments in call to 'TESTPROCEDURE' ORA-06550: line 1, column 7: PL/SQL: Statement
ignored Error Code: 6550 Call: BEGIN p_test.testProcedure(param=>?); END; bind => [test] Query: DataReadQuery()

I also have tried setting call argument type to java.sql.Types.VARCHAR and none at all, to no effect.

Someone have any ideas what am I doing wrong? Thanks everyone.

Answer 1

It looks like you are specifying a different procedureParameterName in the addNamedArgument method than what is specified in your stored procedure, ie, "param" vs "as_param". Try changing your logic to the following:

call.addNamedArgument("as_param", "param", String.class);

This method maps the parameter name between what is used in your call to query.addParameter and what is defined in the stored procedure.

Answer 2

From TopLink docs

addNamedArgument

public void addNamedArgument(java.lang.String procedureParameterName,
                             java.lang.String argumentFieldName)

PUBLIC: Define the argument to the stored procedure and the field/argument name to be substitute for it. The procedureParameterName is the name of the procedure argument expected. The argumentFieldName is the field or argument name to be used to pass to the procedure. If these names are the same (as they normally are) this method can be called with a single argument.

public void addNamedArgumentValue(java.lang.String procedureParameterName,
                                  java.lang.Object argumentValue)

 call.addNamedArgumentValue("param",(Object)values );

Answer 3

Solved using a combination of the above two answers and my own wits.

First, I used addNamedArgumentValue asu suggested by #1. Second, I used the correct procedure parameter name as suggested by #2. Last, I used directly jem.executeNonSelectingCall(call) and it worked. (Also with OUT parameters).

So they both get a vote up!