Mybatis 源码搭建

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源码下载

首先下载mybatis-parent的源码：gitee地址 => https://gitee.com/callback_lab/mybatis-parent.git

然后下载mybatis的源码：gitee地址 => https://gitee.com/callback_lab/mybatis-src.git

带中文注释的三方源码

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以下包需要注释，否则会报错 ：

org.apache.ibatis.exceptions.PersistenceException: 
### Error building SqlSession.
### Cause: java.lang.IllegalStateException: Cannot enable lazy loading because Javassist is not available. Add Javassist to your classpath.

    <dependency>
      <groupId>ognlgroupId>
      <artifactId>ognlartifactId>
      <version>3.2.20version>


    dependency>
    <dependency>
      <groupId>org.javassistgroupId>
      <artifactId>javassistartifactId>
      <version>3.27.0-GAversion>


    dependency>

将mybatis-parent与mybatis导入idea同一个project下。

测试模块搭建

新建一个测试模块，这里叫mybatis-gabriel

项目基础架构

实例原博客

pom :

  <dependencies>
    <dependency>
      <groupId>junitgroupId>
      <artifactId>junitartifactId>
      <version>4.11version>
      <scope>testscope>
    dependency>
    <dependency>
      <groupId>org.mybatisgroupId>
      <artifactId>mybatisartifactId>
      <version>3.3.0-SNAPSHOTversion>
    dependency>

  dependencies>

相关代码

主要测试入口代码

public class TestMain {
    public static void main(String[] args) {
        String resource = "mybatis-config.xml";
        InputStream inputStream = null;
        try {
            inputStream = Resources.getResourceAsStream(resource);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        SqlSessionFactory sqlSessionFactory = null;
        sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
        SqlSession sqlSession = null;
        try {
            sqlSession = sqlSessionFactory.openSession();
            RoleMapper roleMapper = sqlSession.getMapper(RoleMapper.class);
            Role role = roleMapper.getRole(1L);
            System.out.println(role.getId() + ":" + role.getRoleName() + ":" + role.getNote());
            sqlSession.commit();

        } catch (Exception e) {
            // TODO Auto-generated catch block
            sqlSession.rollback();
            e.printStackTrace();
        } finally {
            sqlSession.close();
        }
    }
}

po ：

/*
 * @author gethin
 * 角色的实体类
 */
public class Role {
    private long id;
    private String roleName;
    private String note;

    public long getId() {
        return id;
    }

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

    public String getRoleName() {
        return roleName;
    }

    public void setRoleName(String roleName) {
        this.roleName = roleName;
    }

    public String getNote() {
        return note;
    }

    public void setNote(String note) {
        this.note = note;
    }
}

MyStringHandler ：

@MappedTypes({String.class})
@MappedJdbcTypes(JdbcType.VARCHAR)
public class MyStringHandler implements TypeHandler<String> {

     Logger log= Logger.getLogger(MyStringHandler.class.getName());

    @Override
    public String getResult(ResultSet rs, String colName) throws SQLException {
        log.info("使用我的TypeHandler,ResultSet列名获取字符串");
        return rs.getString(colName);
    }

    @Override
    public String getResult(ResultSet rs, int index) throws SQLException {
        log.info("使用我的TypeHandler,ResultSet下标获取字符串");
        return rs.getString(index);
    }

    @Override
    public String getResult(CallableStatement cs, int index) throws SQLException {
        log.info("使用我的TypeHandler,CallableStatement下标获取字符串");
        return cs.getString(index);
    }

    @Override
    public void setParameter(PreparedStatement ps, int index, String value, JdbcType arg3) throws SQLException {
        log.info("使用我的TypeHandler");
        ps.setString(index, value);
    }

}

mapper ：

public interface RoleMapper {
    public Role getRole(Long id);
    public Role findRole(String roleName);
    public int deleteRole(Long id);
    public int insertRole(Role role);
}

RoleMapper.xml ：

DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="org.mybatis.debug.mapper.RoleMapper">
    <resultMap type="org.mybatis.debug.po.Role" id="roleMap">
        <id column="id" property="id" javaType="long" jdbcType="BIGINT" />
        <result column="role_name" property="roleName" javaType="string"
                jdbcType="VARCHAR" />
        <result column="note" property="note"
                typeHandler="org.mybatis.debug.handle.MyStringHandler" />
    resultMap>
    <select id="getRole" parameterType="long" resultMap="roleMap">
        select
        id,role_name as roleName,note from role where id=#{id}
    select>
    <select id="findRole" parameterType="long" resultMap="roleMap">
        select
        id,role_name,note from role where role_name like CONCAT('%',#{roleName
        javaType=string,
        jdbcType=VARCHAR,typeHandler=com.gethin.handler.MyStringHandler},'%')
    select>
    <insert id="insertRole" parameterType="org.mybatis.debug.po.Role">
        insert into
        role(role_name,note) value(#{roleName},#{note})
    insert>
    <delete id="deleteRole" parameterType="long">
        delete from role where
        id=#{id}
    delete>
mapper>

sql ：

-- ----------------------------
-- Table structure for role
-- ----------------------------
DROP TABLE IF EXISTS `role`;
CREATE TABLE `role` (
  `id` int(11) DEFAULT NULL,
  `role_name` varchar(255) DEFAULT NULL,
  `note` varchar(255) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of role
-- ----------------------------
INSERT INTO `role` VALUES ('1', '管理员', '管理员');

-- ----------------------------
-- Table structure for role
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
  `id` int(11) DEFAULT NULL,
  `role_id` int(11) DEFAULT NULL,
  `user_name` varchar(255) DEFAULT NULL,
  `user_note` varchar(255) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of role
-- ----------------------------
INSERT INTO `user` VALUES ('1', '1','张三', '管理员张三');

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