Apache的DBUtils

package com.test.dbutil;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

import javax.sql.DataSource;

import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.ResultSetHandler;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.apache.commons.dbutils.handlers.BeanListHandler;

import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;

public class UserDaoImpl implements UserDao  {
	
	public DataSource getDataSource(){
		String url = "jdbc:mysql://127.0.0.1:3306/testdbutils";
		MysqlDataSource ds = new MysqlDataSource();
		ds.setServerName("127.0.0.1");
//		ds.setDatabaseName("testdbutils");
		ds.setURL(url);
		ds.setUser("root");
		ds.setPassword("123456");
		ds.setCharacterEncoding("utf8");
		return ds;
	}
	
	public BeanListHandler<User> getBeanListHandler(){
		return new BeanListHandler<User>(User.class);
	}
	
	public BeanHandler<User> getBeanHandler(){
		return new BeanHandler<User>(User.class);
	}

	public void delete(int id) {
		QueryRunner runner = new QueryRunner(getDataSource());
		try {
			int affectedRows = runner.update("delete from user where id = ?",id);
			System.out.println("删除成功,影响的行数:"+affectedRows);
		} catch (SQLException e) {
			System.out.println("删除id为"+id+"的记录失败。错误为:"+e.getMessage());
		}
	}

	public void delete(User user) {
		delete(user.getId());
	}

	public List<User> getAllUsers() {
		QueryRunner runner = new QueryRunner(getDataSource());
		try {
			return runner.query("select * from user", getBeanListHandler());
		} catch (SQLException e) {
			e.printStackTrace();
			return null;
		}
	}

	public User getById(int id) {
		QueryRunner runner = new QueryRunner(getDataSource());
		User user = null;
		try {
			user = runner.query("select * from user where id = ?", getBeanHandler(),id);
		} catch (SQLException e) {
			e.printStackTrace();
		}
		
		return user;
	}

	public void save(User user) {
		QueryRunner runner = new QueryRunner(getDataSource());
		try {
			runner.update("insert into user values(?,?,?,?,?)",new Object[]{
					user.getId(),
					user.getName(),
					user.getAge(),
					user.getSex(),
					user.getBirth()
			});
		} catch (SQLException e) {
			System.out.println("插入失败,失败原因:"+e.getMessage());
		}
	}

	public long getCount() {
		QueryRunner runner = new QueryRunner(getDataSource());
		try {
			
			
			Long count = runner.query("select count(*) as count from user", new ResultSetHandler<Long>(){

				public Long handle(ResultSet rs) throws SQLException {
					if(rs.next()){
						return rs.getLong(1); //或者rs.getLong("count");
					}
					return 0L;
				}
				
			});
			
			//或者用ScalarHandler, 这里的new ScalarHandler() 可以加上“count”参数
//			Long count = (Long)runner.query("select count(*) as count from user",new  ScalarHandler(){
//
//				@Override
//				public Object handle(ResultSet rs) throws SQLException {
//					return super.handle(rs);
//				}
//				
//			});

			return (Long)count;
		} catch (SQLException e) {
			e.printStackTrace();
			return 0L;
		}
	}
	
	
	
}

 如果什么框架都不想用,那就最基础的jdbc吧,简单封装下。

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