MyBatis初次环境配置

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简单介绍

MyBatis 本是apache的一个开源项目iBatis, 2010年这个项目由apache software foundation 迁移到了google code，并且改名为MyBatis 。2013年11月迁移到Github。
iBATIS一词来源于“internet”和“abatis”的组合，是一个基于Java的持久层框架。iBATIS提供的持久层框架包括SQL Maps和Data Access Objects（DAO）

1.导包

核心包

依赖包

当然还要有数据库驱动包

2.写xml配置

项目结构如下

2.1添加SqlMapConfig.xml配置文件

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE configurationPUBLIC "-//mybatis.org//DTD Config 3.0//EN""http://mybatis.org/dtd/mybatis-3-config.dtd"><configuration>    <environments default="development">        <environment id="development">            <transactionManager type="JDBC" />            <dataSource type="POOLED">                <property name="driver" value="com.mysql.jdbc.Driver" />                <property name="url" value="jdbc:mysql://localhost:3306/db_pwc" />                <property name="username" value="pwc" />                <property name="password" value="123456" />            </dataSource>        </environment>    </environments>    <mappers>        <mapper resource="com/pwc/pojo/User.xml" />    </mappers></configuration>

2.2添加POJO类User.java

package com.pwc.pojo;public class User {    private int id;    private String name;    private int age;    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 int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }    @Override    public String toString() {        return "User [id=" + id + ", name=" + name + ", age=" + age + "]";    }    public User(int id, String name, int age) {        super();        this.id = id;        this.name = name;        this.age = age;    }    public User() {    }}

2.3添加POJO类User的映射文件User.xml

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="com.pwc.dao.mapper.UserMapper">    <select id="findById" parameterType="int" resultType="com.pwc.pojo.User">        SELECT * FROM User WHERE id = #{id}    </select>    <insert id="insert" parameterType="com.pwc.pojo.User">        INSERT INTO User(name,age) VALUES(#{name},#{age})    </insert>    <delete id="deleteById" parameterType="int">        DELETE * FROM User WHERE id=#{id}    </delete>    <select id="findByAge" parameterType="int" resultType="com.pwc.pojo.User">        SELECT * FROM User WHERE age=#{age}    </select></mapper>

3.测试

package com.pwc.test;import org.apache.ibatis.session.SqlSession;import org.apache.ibatis.session.SqlSessionFactory;import org.apache.ibatis.session.SqlSessionFactoryBuilder;import com.pwc.pojo.User;public class Test {    public static void main(String[] args) {        SqlSessionFactoryBuilder builder=new SqlSessionFactoryBuilder();        SqlSessionFactory factory = builder.build(Test.class.getClassLoader().getResourceAsStream("SqlMapConfig.xml"));        SqlSession session = factory.openSession();        User user=session.selectOne("findById", 1);        System.out.println(user.toString());    }}

测试结果如下：
User [id=1, name=pwc, age=18]

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