mybatis入门配置

pom.xml:

<dependencies>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.6</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.20</version>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.12</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
    </dependencies>

log4j.properties:

#全局配置
log4j.rootLogger=DEBUG,console
#debug 测试阶段使用
#控制台日志输出
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} [%p] %m %n

jdbc.properties:

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/spring
jdbc.username=root
jdbc.password=123456

mybatisConfig.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">

    <!--mybatis的主配置文件-->
<configuration>
    <properties resource="jdbc.properties"/>
    <typeAliases>
        <!--用于指定别名-->
        <!--<typeAlias type="com.wance.entity.Person" alias="Person"/>-->
        <!--用于指定注册别名的包，当指定后，该包下的实体类都会注册别名，并且类名就是别名，-->
        <!--不再区分大小写-->
        <package name="com.wance.entity"/>
    </typeAliases>
    <!--配置环境-->
    <environments default="mysql">
        <environment id="mysql">
            <!--配置事务类型-->
            <transactionManager type="JDBC"></transactionManager>
            <!--配置数据源-->
            <dataSource type="POOLED">
                <!--配置数据库的4个基本信息-->
                <property name="driver" value="${jdbc.driver}"/>
                <property name="url" value="${jdbc.url}"/>
                <property name="username" value="${jdbc.username}"/>
                <property name="password" value="${jdbc.password}"/>
            </dataSource>
        </environment>
    </environments>

    <mappers>
        <!--<mapper resource="PersonMapper.xml"/>-->
        <!--<mapper class="com.wance.Mapper.PersonMapper"/>-->
        <package name="com.wance.Mapper"/>
    </mappers>
</configuration>

整体配置完成
自己写mapper.xml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">
<!--配置接口的路径-->
<mapper namespace="com.wance.Mapper.PersonMapper">
    <select id="findAll" resultType="Person">
        select * from person
    </select>
</mapper>

测试类：

public class TestPersonMapper {
    @Test
    public void test() throws IOException {
        //读取配置文件
        InputStream in= Resources.getResourceAsStream("SqlMapperConfig.xml");
        //创建SqlSessionFactory工厂
        SqlSessionFactory factory=new SqlSessionFactoryBuilder().build(in);
        //使用工厂产生SqlSession对象
        SqlSession session=factory.openSession();
        //产生Person对象
        PersonMapper personMapper=session.getMapper(PersonMapper.class);
        System.out.println(personMapper.findAll());
    }
}

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