使用本机SQL Hibernate从存储过程中检索值

问题描述

下面是存储过程:

create or replace procedure
proc_emp_name(v_emp out emp.emp_name%TYPE, v_empid in emp.emp_id%TYPE)
is
begin
select emp_name into v_emp from emp where emp_id = v_empid;
dbms_output.put_line('Emp Name: ' || v_emp);
dbms_output.put_line('Procedure created successfully!!!');
end;

我想使用本机SQL调用此链接，但单击此链接，但不确定如何从过程中检索OUT参数.

I want to invoke this using Native SQL, followed this link but not sure how to retrieve the OUT parameter from the Procedure.

http://www.mkyong.com /hibernate/如何在休眠状态下调用存储过程/

请告诉我最简单的方法来调用该过程并从中获取结果.

Kindly let me know the simplest way to invoke the procedure and get the results out of it.

编辑

根据建议，检查文档后，我将具有第一个参数的Proc修改为SYS_REFCURSOR，如下所示:

As suggested, checking the docs, I modified the Proc having first parameter as a SYS_REFCURSOR as follows:

create or replace procedure
proc_empname_refcursor(v_empname OUT SYS_REFCURSOR, v_deptid in emp.emp_id%type)
is
begin
open v_empname for select * from dept where dept_id = v_deptid;
end;

我可以使用NamedQuery调用它，但是由于其他一些限制，我不想在映射文件中添加任何内容.我尝试使用下面的代码在不使用NamedQuery的情况下调用proc，但没有成功:

I am able to invoke it using NamedQuery but I don't want to add anything in the mapping files because of some other restrictions. I tried the below code for invoking the proc without using NamedQuery but it did not worked out:

Query query = session.createSQLQuery(
                "CALL proc_empname_refcursor(?, :deptId)")
                .addEntity(Dept.class)
                .setParameter("deptId", new Integer(2));

            List<Dept> departments = query.list();
            for(int i=0; i<departments.size(); i++){
                Dept department = (Dept)departments.get(i);
                System.out.println("Dept Id: " + department.getDeptId());
                System.out.println("Dept Name: " + department.getDeptName());
            }

我遇到了例外情况:

org.hibernate.QueryException: Expected positional parameter count: 1, actual parameters: [] [CALL proc_empname_refcursor(?, :deptId)]
at     org.hibernate.impl.AbstractQueryImpl.verifyParameters(AbstractQueryImpl.java:319)
at org.hibernate.impl.SQLQueryImpl.verifyParameters(SQLQueryImpl.java:201)
at org.hibernate.impl.SQLQueryImpl.list(SQLQueryImpl.java:145)
at com.jdbc.HibernateStartup.main(HibernateStartup.java:70)

请让我知道如何解决此问题.

Kindly let me know how to resolve this.

推荐答案

我已经使用Hibernate和MS SQL Server中的以下代码设法从存储过程中获取out参数:

I've managed to get an out parameter from a stored procedure using the following code in Hibernate and MS SQL Server:

@Override
public Serializable generate(SessionImplementor session, Object object) throws HibernateException {
    Connection connection = session.connection();
    CallableStatement callable = null;
    try {
        callable = connection.prepareCall("execute [procedure] ?");
        callable.registerOutParameter(1, Types.INTEGER);
        callable.execute();
        int id = callable.getInt(1);

        return id;
    } catch (SQLException e) {
        (...)
    } finally {
        (...)
    }
}

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