MyBatis 配置文件及创建session工厂

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1.数据库的配置文件     全局配置文件    SqlMappingConfig.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>
    <!-- spring整合后 environments配置将废除 使用spring中的连接池 -->
    <environments default="development">
        <environment id="development">
            <!-- 使用jdbc事务管理 -->
            <transactionManager type="JDBC" />
            <!-- 数据库连接池 -->
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver" />
                <property name="url"
                          value="jdbc:mysql://localhost:3306/mybatis?characterEncoding=utf-8" />
                <property name="username" value="root" />
                <property name="password" value="****" />
            </dataSource>
        </environment>
    </environments>

    <!--加载映射文件-->
    <mappers>
        <mapper resource="com/bullet/domain/Customer.xml"></mapper>
    </mappers>

</configuration>

实体类对应的配置文件    类名.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">
<mapper namespace="myTest">
    <!--根据cust_id查询客户-->
    <select id="queryCustomerById" parameterType="Int" resultType="com.bullet.domain.Customer">
	  SELECT * FROM `customer` WHERE cust_id  = #{cust_id}
	</select>
</mapper>

session工厂配置

  public void test1() throws IOException {
        //1.加载配置文件
        SqlSessionFactoryBuilder sqlSessionFactoryBuilder = new SqlSessionFactoryBuilder();
        //2.读取配置文件
        InputStream resourceAsStream = Resources.getResourceAsStream("SqlMappingConfig.xml");
        //3.获取session工厂
        SqlSessionFactory sessionFactory = sqlSessionFactoryBuilder.build(resourceAsStream);
        //4.获取会话
        SqlSession sqlSession = sessionFactory.openSession();
        //5执行sql
        Customer customer = sqlSession.selectOne("queryCustomerById", 2);
        System.out.println(customer);
        //6关闭session
        sqlSession.close();
    }