java程序调用存储过程和存储函数

java程序调用存储过程

jdbcUtil.java文件

package cn.itcast.oracle.utils;

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;
	}

	/*
	 * 执行java程序
	 * java -Xms100m -Xmx200m HelloWorld
	 *
	 * 技术方向
	 * 1. 性能调优
	 * 2. 故障诊断: ThreadDump
	 */
	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;
			}
		}
	}
}

testOracle.java

package cn.itcast.oracle.demo;

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 cn.itcast.oracle.utils.JDBCUtils;

public class TestOracle {
/*调用存储过程

 * 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);
		}
	}

/*调用存储函数

 * 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);
		}
	}

在out参数中使用光标

@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);
		}
	}