mybatis源码系列第一篇-搭建源码环境

环境准备

需要的环境有:jdk1.8，maven>3.25

下载源码

下载mybatis parent pom工程,并且切换到tag mybatis-parent-32

git clone https://github.com/mybatis/parent.git
git checkout mybatis-parent-32

下载mybatis 源码工程

git clone https://github.com/zhangbeiwjl/mybatis-3.git

构建工程

构建mybatis parent工程

cd parent/
mvn clean install -Dmaven.test.skip=true

构建mybatis 工程

cd mybatis-3/
mvn clean install -Dmaven.test.skip=true

用Idea打开

使用Idea打开mybatis工程

pom.xml中注释掉报错的地方,不知道为啥报错，应该没啥用，不影响工程的启动

<!--      <plugin>-->
<!--        <groupId>org.apache.maven.plugins</groupId>-->
<!--        <artifactId>maven-pdf-plugin</artifactId>-->
<!--      </plugin>-->

写个demo

根据mybatis官网的示例写个demo工程
1 在pom中添加mysql的驱动

  <dependency>
    <groupId>mysql</groupId>
     <artifactId>mysql-connector-java</artifactId>
     <version>5.1.47</version>
 </dependency>

2创建resources文件夹，添加mybatis配置文件，以及mapper文件

BlogMapper.xml

<mapper namespace="org.apache.ibatis.demo.BlogMapper">
  <select id="selectBlog" resultType="org.apache.ibatis.demo.Blog">
    select * from Blog where id = #{id}
  select>
mapper>

mybatis-config.xml

<configuration>
  <properties resource="jdbc.properties">properties>
  <environments default="development">
    <environment id="development">
      <transactionManager type="JDBC"/>
      <dataSource type="POOLED">
        <property name="driver" value="${jdbc.driverClassName}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
      dataSource>
    environment>
  environments>
  <mappers>
    <mapper resource="mapper/BlogMapper.xml"/>
  mappers>
configuration>

jdbc.properties

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ms
jdbc.username=root
jdbc.password=root

3编写demo

MybatisDemo.java

package org.apache.ibatis.demo;

import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;

import java.io.IOException;
import java.io.InputStream;

/**
 * @author wangjinlinag
 * @Classname MybatisDemo
 * @Description TODO
 * @Date 2021/1/31 11:56 下午
 */
public class MybatisDemo {
     
  public static void main(String[] args) throws IOException {
     
    String resource = "mybatis-config.xml";
    InputStream inputStream = Resources.getResourceAsStream(resource);
    SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
    SqlSession sqlSession = sqlSessionFactory.openSession();
    Blog blog = (Blog) sqlSession.selectOne("org.apache.ibatis.demo.BlogMapper.selectBlog", 101);
    System.out.println(blog);
  }
}

BlogMapper.java

package org.apache.ibatis.demo;

/**
 * @author wangjinlinag
 * @Classname BlogMapper
 * @Description TODO
 * @Date 2021/2/1 12:06 上午
 */
public interface BlogMapper {
     
  Blog selectBlog(Integer id);
}

Blog.java

package org.apache.ibatis.demo;

/**
 * @author wangjinlinag
 * @Classname Blog
 * @Description TODO
 * @Date 2021/2/1 12:03 上午
 */
public class Blog {
     
  private Integer id;
  private String title;
  private String content;

  public Integer getId() {
     
    return id;
  }

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

  public String getTitle() {
     
    return title;
  }

  public void setTitle(String title) {
     
    this.title = title;
  }

  public String getContent() {
     
    return content;
  }

  public void setContent(String content) {
     
    this.content = content;
  }

  @Override
  public String toString() {
     
    return "Blog{" +
      "id=" + id +
      ", title='" + title + '\'' +
      ", content='" + content + '\'' +
      '}';
  }
}

4执行demo程序，如果可以从数据库中查询出数据说明是没有问题的。

完结撒花，干技术要刨根问底，源码撸起来.