MyBatis项目学习笔记

MyBatis 是一款优秀的持久层框架，它支持定制化 SQL、存储过程以及高级映射。MyBatis 避免了几乎所有的 JDBC 代码和手动设置参数以及获取结果集。MyBatis 可以使用简单的 XML 或注解来配置和映射原生信息，将接口和 Java 的 POJOs(Plain Old Java Objects,普通的 Java对象)映射成数据库中的记录。

@Controller 控制层，就是我们的action层

@Service 业务逻辑层，就是我们的service或者manager层

@Repository 持久层，就是我们常说的DAO层

而@Component （字面意思就是组件），它在你确定不了事哪一个层的时候使用。

其实，这四个注解的效果都是一样的，Spring都会把它们当做需要注入的Bean加载在上下文中；

但是在项目中，却建议你严格按照除Componen的其余三个注解的含义使用在项目中。这对分层结构的web架构很有好处！！

项目所需Jar包：

连接数据库SQL语句：

CREATE DATABASE manpower;

USE manpower;

CREATE TABLE `user` (

`id` INT(10) NOT NULL AUTO_INCREMENT,

`name` VARCHAR(20) DEFAULT NULL,

`sex` VARCHAR(10) DEFAULT NULL,

`birthday` DATE DEFAULT NULL,

`feature` VARCHAR(10) DEFAULT NULL,

`job` VARCHAR(10) DEFAULT NULL,

`jobname` VARCHAR(15) DEFAULT NULL,

`education` VARCHAR(20) DEFAULT NULL,

PRIMARY KEY (`id`)

) ENGINE=INNODB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8

INSERT INTO USER(id,NAME,sex,birthday,feature,job,jobname,education)

VALUES(1,"张三","男","1996-8-8","党员","IT","程序员","本科")

INSERT INTO USER(id,NAME,sex,birthday,feature,job,jobname,education)

VALUES(3,"李四","女","1992-8-8","党员","教育","老师","本科")

jdbc.properties数据库文件配置：

driver=com.mysql.jdbc.Driver

url = jdbc\:mysql\://localhost\:3306/manpower

username = root

password = 1234

log4j.properties日志文件配置:

# Global logging configuration

log4j.rootLogger=DEBUG, stdout

# Console output...

log4j.appender.stdout=org.apache.log4j.ConsoleAppender

log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

实体类：

package cn.wallance.domain;

public class User {

private int id;

private String name;

private String sex;

private String birthday;

private String feature;

private String job;

private String jobname;

private String education;

public int getId()

{

return id;

}

public void setId(int id)

{

this.id = id;

}

public String getName()

{

return name;

}

public void setName(String name)

{

this.name = name;

}

public String getSex()

{

return sex;

}

public void setSex(String sex)

{

this.sex = sex;

}

public String getBirthday()

{

return birthday;

}

public void setBirthday(String birthday)

{

this.birthday = birthday;

}

public String getFeature()

{

return feature;

}

public void setFeature(String feature)

{

this.feature = feature;

}

public String getJob()

{

return job;

}

public void setJob(String job)

{

this.job = job;

}

public String getJobname()

{

return jobname;

}

public void setJobname(String jobname)

{

this.jobname = jobname;

}

public String getEducation()

{

return education;

}

public void setEducation(String education)

{

this.education = education;

}

Dao接口:

package cn.wallance.dao;

import java.util.List;

import cn.wallance.domain.User;

public interface IUserDao {

//全查询

public abstract List<User> selectAll();

//插入数据

public abstract int addUser(User user);

//删除数据

public abstract int deleteUser(int id);

//查询一个用户

public abstract User selectone(int id);

//修改数据

public abstract int updateUser(User user);

}

Dao接口实现类：

package cn.wallance.dao;

import java.util.List;

import javax.annotation.Resource;

Import

org.apache.ibatis.session.SqlSessionFactory;

import org.mybatis.spring.support.SqlSessionDaoSupport;

import org.springframework.stereotype.Repository;

import cn.wallance.domain.User;

@Repository("userDao")//注解是告诉Spring，让Spring创建一个名字叫“userDao”的UserDaoImpl实例。

public class UserDaoImpl extends SqlSessionDaoSupport implements IUserDao {

@Resource

public void setSuperSessionFactory(SqlSessionFactory sessionFactory){

this.setSqlSessionFactory(sessionFactory);

}

public List<User> selectAll() {

// TODO Auto-generated method stub

List<User> users = this.getSqlSession().selectList("getUser");

return users;

}

@Override

public int addUser(User user) {

// TODO Auto-generated method stub

int add=this.getSqlSession().insert("adduser",user);

return add;

}

@Override

public int deleteUser(int id)

{

// TODO Auto-generated method stub

int del=this.getSqlSession().delete("delete",id);

return del;

}

@Override

public User selectone(int id)

{

// TODO Auto-generated method stub

User sl=this.getSqlSession().selectOne("selectone",id);

return sl;

}

@Override

public int updateUser(User user)

{

// TODO Auto-generated method stub

int up=this.getSqlSession().update("update",user);

return up;

}

Mapper映射文件：

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

select * from user

</select>

insert into user(name,sex,birthday,feature,job,jobname,education)

values(#{name},#{sex},#{birthday},#{feature},#{job},#{jobname},#{education})

</insert>

delete from user where id=#{id}

</delete>

select * from user where id=#{id}

</select>

update user set name=#{name},sex=#{sex},birthday=#{birthday},

feature=#{feature},job=#{job},jobname=#{jobname},education=#{education}

where id=#{id}

</update>

</mapper>

业务逻辑层service接口：

package cn.wallance.service;

import java.util.List;

import cn.wallance.domain.User;

public interface IUserService {

public abstract List<User> selectAll();

public abstract int addUser(User user);

public abstract int deleteUser(int id);

public abstract User selectone(int id);

public abstract int updateUser(User user);

}

业务逻辑层service接口实现类：

package cn.wallance.service;

import java.util.List;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;

import cn.wallance.dao.IUserDao;

import cn.wallance.domain.User;

@Service("userService")

public class UserServiceImpl implements IUserService {

private IUserDao userDao;

public IUserDao getUserDao() {

return userDao;

}

@Resource

public void setUserDao(IUserDao userDao) {

this.userDao = userDao;

}

@Override

public List<User> selectAll() {

// TODO Auto-generated method stub

return userDao.selectAll();

}

@Override

public int addUser(User user) {

// TODO Auto-generated method stub

return userDao.addUser(user);

}

@Override

public int deleteUser(int id)

{

// TODO Auto-generated method stub

return userDao.deleteUser(id);

}

@Override

public User selectone(int id)

{

// TODO Auto-generated method stub

return userDao.selectone(id);

}

@Override

public int updateUser(User user)

{

// TODO Auto-generated method stub

return userDao.updateUser(user);

}

Controller层（用于服务客户端请求的服务端）：

package cn.wallance.web;

import java.util.Date;

import java.util.List;

import javax.annotation.Resource;

import javax.swing.Spring;

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.bind.annotation.RequestParam;

import cn.wallance.domain.User;

import cn.wallance.service.IUserService;

@Controller

public class HomeController {

private IUserService userService;

public IUserService getUserService() {

return userService;

}

@Resource

public void setUserService(IUserService userService) {

this.userService = userService;

}

@RequestMapping(value="/home",method=RequestMethod.GET)

public String home(Model model){

List<User> users = userService.selectAll();

model.addAttribute("users", users);

return "home";

}

@RequestMapping(value="/insert",method=RequestMethod.GET)

public String insert(Model model){

return "insert";

}

@RequestMapping(value="/insert",method=RequestMethod.POST)

public String insert(String name, String sex, String birthday,

String feature, String job,String jobname,String education){

User user=new User();

user.setName(name);

user.setSex(sex);

user.setBirthday(birthday);

user.setFeature(feature);

user.setJob(job);

user.setJobname(jobname);

user.setEducation(education);

userService.addUser(user);

return "redirect:home";

}

@RequestMapping(value="/delete",method=RequestMethod.GET)

public String delete(Model model,int id){

userService.deleteUser(id);

return "redirect:home";

}

@RequestMapping(value="/update",method=RequestMethod.GET)

public String update(Model model,int id){

User user=userService.selectone(id);

model.addAttribute("user",user);

return "update";

}

@RequestMapping(value="/update",method=RequestMethod.POST)

public String update(int id,User user){

userService.updateUser(user);

return "redirect:home";

}

school-mybatis.xml环境配置文件：

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns:mybatis="http://mybatis.org/schema/mybatis-spring"

xmlns:context="http://www.springframework.org/schema/context"

xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd

http://mybatis.org/schema/mybatis-spring http://mybatis.org/schema/mybatis-spring.xsd

http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

<context:component-scan base-package="cn.wallance" />

<bean id="propertyConfigurer"

class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">

</bean>

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"

destroy-method="close">

</bean>

</bean>

</bean>

<bean id="transactionManager"

class="org.springframework.jdbc.datasource.DataSourceTransactionManager">

</bean>

</beans>

school-servlet.xml注解配置文件：

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns:context="http://www.springframework.org/schema/context"

xmlns:mvc="http://www.springframework.org/schema/mvc"

xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd

http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd

http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd">

<mvc:annotation-driven/>

<context:component-scan base-package="cn.wallance.web"/>

</bean>

</beans>

web.xml配置文件:

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">

<servlet-name>school</servlet-name>

<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>school</servlet-name>

<url-pattern>/</url-pattern>

</servlet-mapping>

<context-param>

<param-name>contextConfigLocation</param-name>

<param-value>classpath:school-mybatis.xml</param-value>

</context-param>

<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

</listener>

<filter-name>CharacterFilter</filter-name>

<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>

<init-param>

<param-name>encoding</param-name>

<param-value>UTF-8</param-value>

</init-param>

</filter>

<filter-mapping>

<filter-name>CharacterFilter</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

</web-app>

JSp页面(home.jsp)：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>My JSP 'index.jsp' starting page</title>

<!--

-->

</head>

<body>

<caption>人员信息表</caption>

<tr>

</tr>

<c:forEach items="${users}" var="user">

<tr>

<td>${user.birthday}</td>

<td>${user.feature}</td>

<td>${user.jobname}</td>

<td>${user.education}</td>

</tr>

</c:forEach>

</table>

</body>

</html>

Insert.jsp(添加页面):

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>My JSP 'index.jsp' starting page</title>

<!--

-->

</head>

<body>

<caption>人员信息表</caption>

<tr>

</tr>

<c:forEach items="${users}" var="user">

<tr>

<td>${user.birthday}</td>

<td>${user.feature}</td>

<td>${user.jobname}</td>

<td>${user.education}</td>

</tr>

</c:forEach>

</table>

</body>

</html>

update.jsp（修改页面）：

<%@ page language="java" contentType="text/html; charset=utf-8"

pageEncoding="utf-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<title>Insert title here</title>

</head>

<body>

<caption>人员信息表</caption>

<tr>

</tr>

<tr>

</tr>

<tr>

</form>

</tr>

</table>

</body>

</html>

MyBatis项目学习笔记

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