mybatis（三）mybatis接口与配置文件

同mybatis配置的前三步骤：1.创建java项目，2.导入jar包，3.创建数据库、表、添加数据

一.mybatis配置 mybatis-cofig.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!-- 配置别名 -->
<typeAliases>
<typeAlias type="com.mybatis.all.model.User" alias="user" />
</typeAliases>
<!-- 配置环境 -->
<environments default="development">
<environment id="development">
<!-- JDBC事务管理 -->
<transactionManager type="JDBC"></transactionManager>
<!-- 数据源       驱动、数据库连接、用户名、密码 -->
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/test" />
<property name="username" value="root" />
<property name="password" value="110119" />
</dataSource>
</environment>
</environments>
<!-- 配置映射文件 -->
<mappers>
<mapper resource="com/mybatis/all/dao/UserInterface.xml" />
</mappers>
</configuration>

二.创建实体类

/**
* @author wuchao
* @time 下午3:14:36
* @description TODO
*/
package com.mybatis.all.model;

/**
* @author wuchao
* @time 下午3:14:36
*
*/
public class User {

private Integer id;
private String name;
private String dept;
private String phone;
private String website;

/**
* @author wuchao
* @time 下午3:17:43
*/
public User() {
super();
// TODO Auto-generated constructor stub
}

/**
* @author wuchao
* @time 下午3:17:49
*/
public User(Integer id, String name, String dept, String phone,
String website) {
super();
this.id = id;
this.name = name;
this.dept = dept;
this.phone = phone;
this.website = website;
}

public Integer getId() {
return id;
}

public void setId(Integer id) {
this.id = id;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getDept() {
return dept;
}

public void setDept(String dept) {
this.dept = dept;
}

public String getPhone() {
return phone;
}

public void setPhone(String phone) {
this.phone = phone;
}

public String getWebsite() {
return website;
}

public void setWebsite(String website) {
this.website = website;
}

}

三.创建接口 UserInterface.java

/**
* @author wuchao
* @time 下午3:19:30
* @description TODO
*/
package com.mybatis.all.dao;

import java.util.List;

import com.mybatis.all.model.User;

/**
* @author wuchao
* @time 下午3:19:30
*映射文件接口  用来做接口注解
*/
public interface UserInterface {

public User getUserById(int id);
public List<User> getUserList();
public void insertUser(User user);
public void deleteUser(int id);
public void updateUser(User user);
}

四.创建接口—配置文件 UserInterface.xml

<?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">
<!-- 数据映射文件，与接口一一对应 -->
<!-- mapper的namespace就是数据操作的接口 -->
<mapper namespace="com.mybatis.all.dao.UserInterface">
<resultMap type="user" id="getUser">
<id property="id" column="id" />
<result property="name" column="name"></result>
<result property="dept" column="dept"></result>
<result property="phone" column="phone"></result>
<result property="website" column="website"></result>
</resultMap>

<!-- 通过id查询用户 id为对应接口中的方法 -->
<select id="getUserById" parameterType="int"
resultType="com.mybatis.all.model.User">
select * from user where id = #{id}
</select>

<!-- 插入一条user记录 id为对应接口中的方法 -->
<insert id="insertUser" parameterType="user">
insert into
user(name,dept,phone,website) values(#{name},
#{dept}, #{phone},
#{website})
</insert>

<!-- 查询所有的user List id为对应接口中的方法 -->
<select id="getUserList" parameterType="user" resultMap = "getUser">
select * from user
</select>

<!-- 更新user id为对应接口中的方法 -->
<update id="updateUser" parameterType="user">
update user set name =
#{name}, dept = #{dept}, phone = #{phone}, website =
#{website} where
id = #{id}
</update>

<!-- 删除一条记录 id为对应接口中的方法 -->
<delete id="deleteUser" parameterType="int">
delete from user where id
= #{id}
</delete>
</mapper>

五.创建测试类 test.java

/**
* @author wuchao
* @time 上午8:45:30
* @description TODO
*/
package com.mybatis.all.test;

import java.io.Reader;
import java.text.MessageFormat;
import java.util.List;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import com.mybatis.all.dao.UserInterface;
import com.mybatis.all.model.User;

/**
* @author wuchao
* @time 上午8:45:30
*
*/
public class Test {

// sqlSessionFactory reader
private static SqlSessionFactory sqlSessionFactory;
private static Reader reader;

static {
try {
// 读取mybatis配置文件
reader = Resources.getResourceAsReader("mybatis-config.xml");
// 创建sqlSessionFactory
sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}

public static SqlSessionFactory getSession() {
return sqlSessionFactory;
}

public static void main(String args[]) {
SqlSession session = sqlSessionFactory.openSession();
try {
// 用户数据列表
//getUserList();
// 插入用户数据
// insertUser();
// 通过id查找用户
// getUserById(2);
// 更新用户数据
// User user = new User(1, "zhangsong", "教师", "13811448740",
// "http://huainanrj.net");
// updateUser(user);
//删除用户
deleteUser(6);
} catch (Exception e) {
// TODO: handle exception
} finally {
session.close();
}

}

/**
* @author wuchao 通过id获取user
*/
public static User getUserById(int id) {
User user = new User();
try {
System.out.println("开始查询");
c640

SqlSession session = sqlSessionFactory.openSession();
UserInterface userInterface = session
.getMapper(UserInterface.class);
System.out.println("进入查询");
user = userInterface.getUserById(id);
System.out.println("用户名：" + user.getName());
System.out.println("角色："+user.getDept());
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
return user;
}

/**
*
* @author wuchao
* @time 下午12:34:56 插入数据
*/
public static void insertUser() {
try {
SqlSession session = sqlSessionFactory.openSession();
UserInterface userInterface = session
.getMapper(UserInterface.class);
User user = new User();
user.setId(2);
user.setName("jianan");
user.setDept("xuesheng");
user.setPhone("110");
user.setWebsite("www.sina.com.cn");
userInterface.insertUser(user);
System.out.println("用户名：" + user.getName());
session.commit();
getUserList();
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}

/**
* @author wuchao 获取user列表
*/
public static List getUserList() {
try {
SqlSession session = sqlSessionFactory.openSession();
UserInterface userInterface = session
.getMapper(UserInterface.class);
System.out.println("====开始查询列表======");
printUsers(userInterface.getUserList());
System.out.println("查询结束");
/*
* List<User> userList = userInterface.getUserList(); for (User user
* : userList) { System.out.println("用户id:" + user.getId() + "用户名字："
* + user.getName() + "用户部门：" + user.getDept() + "用户电话：" +
* user.getPhone() + "用户网站：" + user.getWebsite());
*
* }
*/
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
return null;
}

/**
* @author wuchao 更新User
*/
public static void updateUser(User user) {
try {
SqlSession session = sqlSessionFactory.openSession();
UserInterface userInterface = session
.getMapper(UserInterface.class);
getUserList();
// user = userInterface.getUserById(1);
user.setName("吴超");
userInterface.updateUser(user);
session.commit();
getUserList();
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}

/**
* @author wuchao 删除用户
*/
public static String deleteUser(int id) {
try {
SqlSession session = sqlSessionFactory.openSession();
UserInterface userInterface = session
.getMapper(UserInterface.class);
userInterface.deleteUser(6);
session.commit();
getUserList();
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
return "删除成功";
}

/**
* @author wuchao
*/
public static void printUsers(final List<User> users) {
int count = 0;
for (User user : users) {
System.out.println(MessageFormat.format("=====User[{0}]====",
++count));
System.out.println("User id" + user.getId());
System.out.println("User name" + user.getName());
System.out.println("User dept" + user.getDept());
System.out.println("User phone" + user.getPhone());
System.out.println("User website" + user.getWebsite());
}
}
}

六.项目结构图与测试结果