emppowerdao.java

一个jsp的oa系统,里面有很多亮点学习!

package com.oa.lp.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

public class EmpPowerDAO {
	private Connection conn;
	public Connection getConn() {
		return conn;
	}

	public void setConn(Connection conn) {
		this.conn = conn;
	}
	/**
	 * 删除员工所有权限
	 * @throws SQLException 
	 */
	public void delEmpPower(int empId) throws SQLException{
		String sql = "delete from SYS_EMPLOYEE_POWER where EMP_ID=?";
		PreparedStatement pstmt = conn.prepareStatement(sql);
		pstmt.setInt(1,empId);
		pstmt.executeUpdate();
		pstmt.close();
	}
	
	/**
	 * 为员工分配权限
	 * @throws SQLException 
	 */
	
	public void addEmpPower(int empId,String powerIds[]) throws SQLException{
		String sql = "insert into SYS_EMPLOYEE_POWER(EMP_ID,POWER_ID) VALUES(?,?)";
		PreparedStatement pstmt = conn.prepareStatement(sql);
		for(int i=1;i<powerIds.length;i++){
			pstmt.setInt(1,empId);
			pstmt.setInt(2,Integer.parseInt(powerIds[i]));
			pstmt.executeUpdate();
		}
		pstmt.close();
	}
	
	/**
	 * 通过员工ID查找员工下的所有权限
	 * @throws SQLException 
	 */
	public List getPowersByEmpId(int empId) throws SQLException{
		List list = new ArrayList();
		String sql = "select * from SYS_EMPLOYEE_POWER where EMP_ID=?";
		PreparedStatement pstmt = conn.prepareStatement(sql);
		pstmt.setInt(1,empId);
		ResultSet rs = pstmt.executeQuery();
		while(rs.next()){
			int powerId = rs.getInt("POWER_ID");
			list.add(String.valueOf(powerId));
		}
		rs.close();
		pstmt.close();
		return list;
	}
	/**
	 * 通过ID查找员工对应角色下的权限
	 * @throws SQLException 
	 */
	public List getRolePowersByEmpId(int empId) throws SQLException{
		List list=null;
		list=new ArrayList();
		String sql = "select p.POWER_ID from SYS_EMPLOYEE_ROLE r ,SYS_ROLE_POWER p " +
		"where r.ROLE_ID=p.ROLE_ID and r.EMP_ID=?";
		PreparedStatement pstmt = conn.prepareStatement(sql);
		pstmt.setInt(1,empId);
		ResultSet rs = pstmt.executeQuery();
		while(rs.next()){
			int powerId = rs.getInt("POWER_ID");
			list.add(powerId);
		}
		rs.close();
		pstmt.close();
		return list;
	}
	
}