JDBC如何调用存储过程

JDBC开发步骤:

1. 导入驱动包 (ojdbc14.jar 该包自行百度下载)
2. 注册驱动
3. 获取连接
4. 获取执行SQL的statement
5. 封装参数
6. 执行SQL
7. 获取结果
8. 释放资源

import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
 
import org.junit.Test;
 
import oracle.jdbc.OracleCallableStatement;
import oracle.jdbc.driver.OracleTypes;
 
/*
  1.导入驱动包
  2.注册驱动
  3.获取连接
  4.获取执行SQL的statement
  5.封装参数
  6.执行SQL
  7.获取结果
  8.释放资源   
 */
public class TestProcedure {
 
    @Test
    /*
     create or replace procedure proc_gettotalsal(vempno in number,vtotalsal out number)
    is
           
    begin
      select sal*12 + nvl(comm,0) into vtotalsal from emp where empno = vempno;
    end;
     * */
    public void test1() throws Exception{
        //注册驱动
        Class.forName("oracle.jdbc.driver.OracleDriver");
        //2.获取连接
        String url = "jdbc:oracle:thin:@192.168.80.100:1521:orcl";
        String username = "dakang";
        String password = "dakang";
        Connection conn = DriverManager.getConnection(url, username, password);
        //3.获取执行SQL的statement.这是一个固定格式  proc_gettotalsal是一个存储函数
        String sql = "{call proc_gettotalsal(?,?)}";
        CallableStatement state = conn.prepareCall(sql);
        //设置输入参数
        state.setInt(1, 7788);//设置员工编号
        //注册输出参数类型
        state.registerOutParameter(2, OracleTypes.NUMBER);
        
        //4.执行statement
        state.execute();
        
        //5.获取执行结果
        int totalsal = state.getInt(2);
        
        //输出结果
        System.out.println("工资:"+ totalsal);
        
        //6.释放资源
        state.close();
        conn.close();
    }
    
    //调用存储函数
    /*
     create or replace function func_getsal(vempno number) return number
    is
      --声明变量.保存年薪
      vtotalsal number;     
    begin
      select sal*12 + nvl(comm,0) into vtotalsal from emp where empno = vempno;
      return vtotalsal;
    end; 
     */
    @Test
    public void test2() throws Exception{
        //注册驱动
        Class.forName("oracle.jdbc.driver.OracleDriver");
        //2.获取连接
        String url = "jdbc:oracle:thin:@192.168.80.100:1521:orcl";
        String username = "dakang";
        String password = "dakang";
        Connection conn = DriverManager.getConnection(url, username,password);
        //3.获取执行SQL的statement
        String sql = " {?= call func_getsal(?)}";
        CallableStatement state = conn.prepareCall(sql);
        //4.封装参数
        //注册返回类型参数
        state.registerOutParameter(1, OracleTypes.NUMBER);
        //设置第二个参数
        state.setInt(2, 7788);
        //5.执行SQL
        state.execute();        
        //6.获取结果
        int totalsal = state.getInt(1);
        System.out.println("年薪 :  ====" +totalsal);        
        //7.释放资源
        state.close();
        conn.close();
    }
    
    /*
     create or replace procedure proc_getemps(vrows out sys_refcursor)
        is
        
        begin
          --1.打开游标, 给游标赋值
          open vrows for select * from emp;
        end;
     * */
    @Test
    public void test3() throws Exception{
        //注册驱动
        Class.forName("oracle.jdbc.driver.OracleDriver");
        //2.获取连接
        String url = "jdbc:oracle:thin:@192.168.80.100:1521:orcl";
        String username = "dakang";
        String password = "dakang";
        Connection conn = DriverManager.getConnection(url, username,password);
        //3.获取执行SQL的statement
        String sql = "{call proc_getemps(?)}";
        CallableStatement call = conn.prepareCall(sql);
        //接口  --- > 对象 -->实现类的名称
        System.out.println(call.getClass().getName());
        OracleCallableStatement oracleCall = (OracleCallableStatement)call;
        //4.注册输出类型的参数
        call.registerOutParameter(1, OracleTypes.CURSOR);
        //5.执行SQL
        call.execute();
        //6.获取执行的结果
        ResultSet resultSet = oracleCall.getCursor(1);
        while(resultSet.next()){
            int empno = resultSet.getInt("empno");
            String name = resultSet.getString("ename");
            System.out.println(empno +" ==== "+name);
        }
        
        //7.释放资源
        resultSet.close();
        call.close();
        conn.close();
    }
}