Oracle数据库（十一）存储过程及Java程序调用存储过程

存储过程procedure

--打印Hello World
/*
调用存储过程:
1. exec sayhelloworld();

2. begin
       sayhelloworld();
       sayhelloworld();
    end;
    /

*/
create or replace procedure sayhelloworld
as
   --说明部分
begin
   dbms_output.put_line('Hello World');
end;
/

--给指定的员工涨100，并且打印涨前和涨后的薪水
create or replace procedure raiseSalary(eno in number)
as
  --定义变量保存涨前的薪水
  psal emp.sal%type;
begin
  select sal into psal from emp where empno=eno;

  update emp set sal = sal+100 where empno=eno;
  
  --要不要commit？ 一般不要
  
  dbms_output.put_line('涨前:'||psal||'   涨后：'||(psal+100));

end;
/

--查询某个员工的姓名 月薪和职位

/*
1. 查询某个员工的所有信息  --> out参数太多
2. 查询某个部门中所有员工的所有信息  ---> 集合
*/
create or replace procedure queryempinfo(eno in number,
                                                                         pename out varchar2,
                                                                         psal       out number,
                                                                         pjob      out varchar2)
as                                                                  
begin
  select ename,sal,empjob into pename,psal,pjob from emp where empno=eno;

end;
/

存储过程中out参数如何返回集合

2. 查询某个部门中所有员工的所有信息  ---> 集合

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;

存储函数function

--查询某个员工的年收入
create or replace function queryempincome(eno in number)
return number
as
  --月薪和奖金
  psal emp.sal%type;
  pcomm emp.comm%type;
begin
  select sal,comm into psal,pcomm from emp where empno=eno;

  --返回年收入
  return psal*12+nvl(pcomm,0);
end;
/

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JAVA程序中调用存储过程

package demo.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:@192.168.26.11:1521:orcl";
		private static String user = "scott";
		private static String password = "tiger";
		
		static{
			try {
				Class.forName(driver);   
				//DriverManager.registerDriver(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;
		}

		/*
		 * 运行Java程序:
		 * java -Xms100M -Xmx200M HelloWorld
		 * 
		 * 技术方向：
		 * 1. 性能调优  --> tomcat
		 * 2. 故障诊断 --> 死锁(JDK ThreadDump)
		 *              win: ctrl+break
		 *              linux: kill -3 pid
		 */
		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;
				}
			}
		}
}

package demo.oracle.testdemo;

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 demo.oracle.utils.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);
			
			//调用
			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);			
			//调用
			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);
		}		
		
	}
	
	@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);
			
			//设置部门号
			call.setInt(1, 20);
			
			//申明out
			call.registerOutParameter(2, OracleTypes.CURSOR);
			
			//执行
			call.execute();
			
			//取出结果
			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);
		}	
	}
}