MyBais入门

 <!--源码文件包-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.4.2</version>
      <classifier>sources</classifier>
    </dependency>

    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>1.7.12</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>1.7.12</version>
    </dependency>

<?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>

   <properties resource="jdbc.properties"></properties>
    <settings>
        <setting name="autoMappingBehavior" value="PARTIAL"/>
    </settings>
   <typeAliases>
       <typeAlias type="cn.wwy.entity.wwyy" alias="all"></typeAlias>
   </typeAliases>
    <environments default="development">
  //environments元素：用于配置多个数据环境。
   <environment id="development"> 
//每个数据库环境的具体配置，包括数据连接信息
<transactionManager type="JDBC"></transactionManager>

//JDBC:直接使用JDBC控制事务。它依赖于从数据源得到的连接来管理事务范围。
            <dataSource type="POOLED">
   //PooLED:采用连接池创建新的连接实例时必要的初始连接和认证时间。这是一种当前Web应用程序快速响应请求的流行方法。
                <property name="driver" value="${jdbc.driver}"/>
                <property name="url" value="${jdbc.url}"></property>
                <property name="username" value="${jdbc.username}" />
                <property name="password" value="${jdbc.password}" />
            </dataSource>
        </environment>
    </environments>

<?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">
<mapper namespace="cn.wwy.dao.WwyDaoImpl">
 <!--   <resultMap id="selectAll2" type="cn.wwy.entity.wwyy">
        <id property="id" column="id"></id>
        <result property="name" column="name"></result>
        <result property="age" column="age"></result>
    </resultMap>
<select id="selectAll" resultMap="selectAll2">
    select * from wwyy
</select>
-->
    <select id="selectAll3" resultType="all">
        select * from wwyy WHERE id=#{id}
    </select>

    <insert id="insertinfo">

    </insert>
</mapper>

  @Test
    public void  test() throws IOException {
        String resource = "mybatis-cfg.xml";
        InputStream inputStream = Resources.getResourceAsStream(resource);
        //获得会话工厂
        SqlSessionFactory sf = new SqlSessionFactoryBuilder().build(inputStream);
        //会话
        SqlSession session = sf.openSession();
        WwyDaoImpl mapper = session.getMapper(WwyDaoImpl.class);
        wwyy sles = mapper.selectAll3(1);
        System.out.println(sles.getName());
        session.close();
    }