Java经典封装JDBC模板(充分体现面向对象思想)

程序清单一览

bean类

package com.software.usermanager.bean;

public class Users {
	private String id;
	private String name;
	private String age;
	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getAge() {
		return age;
	}
	public void setAge(String age) {
		this.age = age;
	}
	

}

dao类

package com.software.usermanager.dao;


import com.software.usermanager.bean.Users;
import com.software.usermanager.util.PageModel;
import java.util.List;

public interface UsersDAO {
	public boolean insert(Users user);	//增
	public boolean delete(String id);   //单条删除
	public boolean delete(String[] userIds);  //批量删除
	public boolean update(Users user);  //修改
	public List query();     //全部查询
	public Users query(String id);  //单记录查询
	public PageModel query(int pageNo, int pageSize); //分页查询
	public PageModel query(int pageNo, int pageSize,String condition); //分页模糊查询
	public boolean Login(String name,String password); //登录

}

daoimpl类

package com.software.usermanager.dao;
import com.software.usermanager.util.OptTemplate;
import java.sql.ResultSet;
import java.util.List;

import com.software.usermanager.bean.Users;
import com.software.usermanager.util.*;

public class UsersDAOImpl implements UsersDAO {

	private OptTemplate optTemplate = null;

	public UsersDAOImpl(OptTemplate optTemplate) {
		super();
		this.optTemplate = optTemplate;
	}
	public boolean Login(String name, String password) {
		// TODO Auto-generated method stub
		return false;
	}

	public boolean delete(String id) {
		String sql = "delete from users where id=?";
		Object[] obj = { id };
		return optTemplate.update(sql, obj, false);
	}

	public boolean delete(String[] userIds) {
		StringBuffer sbStr = new StringBuffer();
		Object[] obj = userIds;
		;
		for (int i = 0; i < userIds.length; i++) {
			sbStr.append("?,");
		}
		String sql = "delete from users where id in("
				+ sbStr.substring(0, sbStr.length() - 1) + ")";
		return optTemplate.update(sql, obj, false);
	}

	public boolean insert(Users user) {
		String sql = "insert into users(id,name,age) values(?,?,?)";
		Object[] obj = {user.getId(),user.getName(),user.getAge()};
		return optTemplate.update(sql, obj, false);
	}

	@SuppressWarnings("unchecked")
	public List query() {
		String sql = "select * from users";
		Object[] obj = {};
		return (List) optTemplate.query(sql, obj, new UsersDAOObjectMapper());
		
	}

	public Users query(String id) {
		String sql = "select * from users";
		Object[] obj = {};
		return (Users) optTemplate.query(sql, obj, new UsersDAOObjectMapper()).get(0);
	}

	public PageModel query(int pageNo, int pageSize) {
		String sql1 = "select * from users";
		Object[] obj1 = {};
		List list1 = (List) optTemplate.query(sql1, obj1,
				new UsersDAOObjectMapper());
		int i = list1.size();
		String sql="select * from (select j.*,rownum rn from (select * from users) j where rownum<=?) where rn>?";
		Object[] obj = {pageNo * pageSize, (pageNo - 1) * pageSize};
		List list = (List) optTemplate.query(sql, obj,
				new UsersDAOObjectMapper());
		PageModel pagemodel = new PageModel();
		pagemodel.setPageNo(pageNo);
		pagemodel.setPageSize(pageSize);
		pagemodel.setList(list);
		pagemodel.setTotalRecords(i);
		return pagemodel;
	}

	public PageModel query(int pageNo, int pageSize, String condition) {
		String sql1 = "select * from users";
		Object[] obj1 = {};
		List list1 = (List) optTemplate.query(sql1, obj1,
				new UsersDAOObjectMapper());
		int i = list1.size();
		String sql="select * from (select j.*,rownum rn from (select * from users where id like '"+condition+"%' or name like '"+condition+"%') j where rownum<=?) where rn>?";
		Object[] obj = {pageNo * pageSize, (pageNo - 1) * pageSize};
		List list = (List) optTemplate.query(sql, obj,
				new UsersDAOObjectMapper());
		PageModel pagemodel = new PageModel();
		pagemodel.setPageNo(pageNo);
		pagemodel.setPageSize(pageSize);
		pagemodel.setList(list);
		pagemodel.setTotalRecords(i);
		return pagemodel;
	}

	public boolean update(Users user) {
		String sql = "update users set name=?,age=? where id=?";
		Object[] obj = {user.getName(),user.getAge(),user.getId()};
		return optTemplate.update(sql, obj, false);
	}


}
class UsersDAOObjectMapper implements ObjectMapper{
	public Object mapping(ResultSet rs){
		Users u=new Users();	
			try{
				
				u.setId(rs.getString("id"));
				u.setName(rs.getString("age"));
				u.setName(rs.getString("name"));

				
			}catch(Exception ex){
				ex.printStackTrace();
			}

		return u;
	}
	
}

 

util类

package com.software.usermanager.util;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

import com.software.usermanager.db.DBConnection;

public class OptTemplate {
	public Object find(String sql,Object[] obj,ObjectMapper mapper){
		Object o=null;
		Connection conn=null;
		PreparedStatement pstmt=null;
		try{
			conn=DBConnection.getConn();
			pstmt=conn.prepareStatement(sql);
			for(int i=0;i query(String sql,Object[] obj,ObjectMapper mapper){
		Object o=null;
		List