java调用存储过程报错,该如何处理_J2SE

java调用存储过程报错
存储过程建成功了，我在用java调用的时候又报错了。
首先我的存储过程如下：

SQL code

create or replace procedure query_student   isv_name varchar2(20);begin select name into v_name from st_t_student where id=3012; dbms_output.put_line(v_name);end query_student;

我的java代码如下：

Java code

public void test(){        conn = JDBCUtils.getConnection("miniWeb", "miniWeb");        try {            conn.setAutoCommit(false);            //调用存储过程            cstmt = conn.prepareCall("{call query_student}");            rs = cstmt.executeQuery();            while(rs.next()){                System.out.println(rs.getString("v_name"));            }            conn.commit();        } catch (SQLException e) {            e.printStackTrace();            try {                conn.rollback();            } catch (SQLException e1) {                e1.printStackTrace();            }        }finally{            JDBCUtils.closeConnection(rs, pstmt, conn);        }    }

我的错误信息如下：

Java code

java.sql.SQLException: ORA-00900: invalid SQL statement    at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:125)    at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:305)    at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:272)    at oracle.jdbc.driver.T4C8Odscrarr.receive(T4C8Odscrarr.java:203)    at oracle.jdbc.driver.T4CCallableStatement.do_describe(T4CCallableStatement.java:604)    at oracle.jdbc.driver.OracleStatement.get_column_index(OracleStatement.java:3037)    at oracle.jdbc.driver.OracleResultSetImpl.findColumn(OracleResultSetImpl.java:1861)    at oracle.jdbc.driver.OracleResultSet.getString(OracleResultSet.java:1559)    at com.sinosoft.javase.ProcedureTest.test(ProcedureTest.java:36)    at com.sinosoft.javase.ProcedureTest.main(ProcedureTest.java:53)

------解决方案--------------------
如果要返回值得

cstmt=conn.preparCall("call query_student（？，？）");
cstmt.setString(1,"aa");//第一个必须是输入的，不能是输出
cstmt=registerOutParameter(2,java.sql.Types.VARCHAR);//输出
stmt.executeUpdate();
String val=cstmt.getString(2);
------解决方案--------------------
cstmt = conn.prepareCall("{call query_student()}");
cstmt.execute();

------解决方案--------------------
11楼是对的

SQL code

create or replace procedure p_query(v_i in int,v_name out varchar2)isbegin select ename into v_name from emp where empno=7900 and 1=v_i;end p_query;
------解决方案--------------------

返回结果集

SQL codecreate or replace package pa_query as type p_cursor is ref cursor;end pa_query;/create or replace procedure p_query(v_cursor out pa_query.p_cursor)isbeginopen v_cursor for select * from emp;end p_query;