JAVA调用Oracle存储过程和函数

Posted 2020-10-12 H.U.C-王子

连接数据库的工具类：

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class JDBCUtils {

    private static String driver = "oracle.jdbc.OracleDriver";
    private static String url = "jdbc:oracle:thin:@192.168.56.101:1521:orcl";
    private static String user = "scott";
    private static String password = "tiger";
    
    static{
        try {
            Class.forName(driver);
        } catch (ClassNotFoundException e) {
            throw new ExceptionInInitializerError(e);
        }
    }

    public static Connection getConnection(){
        try {
            return DriverManager.getConnection(url, user, password);
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return null;
    }

  
    public static void release(Connection conn,Statement st,ResultSet rs){
        if(rs != null){
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }finally{
                rs = null;   //----> Java GC
            }
        }
        if(st != null){
            try {
                st.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }finally{
                st = null;
            }
        }
        if(conn != null){
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }finally{
                conn = null;
            }
        }
    }
}

调用存储过程和函数的JAVA代码：

import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.ResultSet;

import oracle.jdbc.OracleCallableStatement;
import oracle.jdbc.OracleTypes;

import org.junit.Test;

import JDBCUtils;

public class TestOracle {
/*
 * create or replace procedure queryEmpInfo(eno in number,
                                         pename out varchar2,
                                         psal   out number,
                                         pjob   out varchar2)
 */
    @Test
    public void testProcedure(){
        //{call <procedure-name>[(<arg1>,<arg2>, ...)]}
        String sql = "{call queryEmpInfo(?,?,?,?)}";
        Connection conn = null;
        CallableStatement call = null;
        try {
            conn = JDBCUtils.getConnection();
            call = conn.prepareCall(sql);
            
            //对于in参数，赋值
            call.setInt(1, 7839);
            
            //对于out参数，申明
            call.registerOutParameter(2, OracleTypes.VARCHAR);
            call.registerOutParameter(3, OracleTypes.NUMBER);
            call.registerOutParameter(4, OracleTypes.VARCHAR);
            
            //执行
            call.execute();
            
            //取出结果
            String name = call.getString(2);
            double sal = call.getDouble(3);
            String job = call.getString(4);
            System.out.println(name+"\t"+sal+"\t"+job);
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            JDBCUtils.release(conn, call, null);
        }
    }
    
/*
 * create or replace function queryEmpIncome(eno in number)
return number
 */
    @Test
    public void testFunction(){
        //{?= call <procedure-name>[(<arg1>,<arg2>, ...)]}
        String sql = "{?=call queryEmpIncome(?)}";
        
        Connection conn = null;
        CallableStatement call = null;
        try {
            conn = JDBCUtils.getConnection();
            call = conn.prepareCall(sql);
            
            //对于out参数，申明
            call.registerOutParameter(1, OracleTypes.NUMBER);
            
            //对于in参数，赋值
            call.setInt(2, 7839);

            //执行
            call.execute();
            
            //取出结果
            double income = call.getDouble(1);
            System.out.println(income);
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            JDBCUtils.release(conn, call, null);
        }        
    }
/*
查询某个部门中所有员工的所有信息
包头
CREATE OR REPLACE PACKAGE MYPACKAGE AS 
  type empcursor is ref cursor;
  procedure queryEmpList(dno in number,empList out empcursor);
END MYPACKAGE;

包体
CREATE OR REPLACE PACKAGE BODY MYPACKAGE AS
  procedure queryEmpList(dno in number,empList out empcursor) AS
  BEGIN
    open empList for select * from emp where deptno=dno;  
  END queryEmpList;
END MYPACKAGE;
*/
    @Test
    public void testCursor(){
        String sql = "{call MYPACKAGE.queryEmpList(?,?)}";
        
        Connection conn = null;
        CallableStatement call = null;
        ResultSet rs = null;
        try {
            conn = JDBCUtils.getConnection();
            call = conn.prepareCall(sql);    
            
            call.setInt(1, 20);
            call.registerOutParameter(2, OracleTypes.CURSOR);
            call.execute();
            
            //取出集合
            rs = ((OracleCallableStatement)call).getCursor(2);
            while(rs.next()){
                String name = rs.getString("ename");
                double sal = rs.getDouble("sal");
                System.out.println(name+"\t"+sal);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            JDBCUtils.release(conn, call, rs);
        }    
    }
}