mybatis源码调试历程

1.源码下载

https://github.com/mybatis/mybatis-3

2.添加依赖

这一步很重要，如果想要使用自己的数据库调试，要在mybatis的pom中添加自己的驱动jar包。

本人使用的是MySQL，添加如下依赖

    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.46</version>
    </dependency>

3.添加自己的测试包

在项目的test包中新建自己的测试包

 

 

 创建mybatis配置文件mybatis-config.xml，配置文件对数据库进行简单配置

<?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>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC">
            </transactionManager>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/test"/>
                <property name="username" value="root"/>
                <property name="password" value="hhh123"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="org/apache/ibatis/ztest/MbGoodsMapper.xml"/>
    </mappers>
</configuration>

创建测试使用的POJO

package org.apache.ibatis.ztest;

import java.math.BigDecimal;
import java.util.Date;

public class MbGoods {

    private String id;

    private String name;

    private BigDecimal price;

    private String description;

    private String type;

    private Integer status;

    private String createBy;

    private Date createTime;

    private String updateBy;

    private Date updateTime;

    public String getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public BigDecimal getPrice() {
        return price;
    }

    public void setPrice(BigDecimal price) {
        this.price = price;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public Integer getStatus() {
        return status;
    }

    public void setStatus(Integer status) {
        this.status = status;
    }

    public String getCreateBy() {
        return createBy;
    }

    public void setCreateBy(String createBy) {
        this.createBy = createBy;
    }

    public Date getCreateTime() {
        return createTime;
    }

    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }

    public String getUpdateBy() {
        return updateBy;
    }

    public void setUpdateBy(String updateBy) {
        this.updateBy = updateBy;
    }

    public Date getUpdateTime() {
        return updateTime;
    }

    public void setUpdateTime(Date updateTime) {
        this.updateTime = updateTime;
    }

    @Override
    public String toString() {
        return "MbGoods{" +
                "id='" + id + '\'' +
                ", name='" + name + '\'' +
                ", price=" + price +
                ", description='" + description + '\'' +
                ", type='" + type + '\'' +
                ", status=" + status +
                ", createBy='" + createBy + '\'' +
                ", createTime=" + createTime +
                ", updateBy='" + updateBy + '\'' +
                ", updateTime=" + updateTime +
                '}';
    }
}

创建Mapper

package org.apache.ibatis.ztest;

import org.apache.ibatis.annotations.Param;

public interface MbGoodsMapper {

    MbGoods selectById(@Param("id") String id);

}

创建Mapper.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="org.apache.ibatis.ztest.MbGoodsMapper">

    <select id="selectById" resultType="org.apache.ibatis.ztest.MbGoods">
      select * from mb_goods where id = #{id}
    </select>

</mapper>

在配置文件mybatis-config.xml中对mapper进行配置

<?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>
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC">
            </transactionManager>
            <dataSource type="POOLED">
                <property name="driver" value="com.mysql.jdbc.Driver"/>
                <property name="url" value="jdbc:mysql://localhost:3306/test"/>
                <property name="username" value="root"/>
                <property name="password" value="hhh123"/>
            </dataSource>
        </environment>
    </environments>
    <mappers>
        <mapper resource="org/apache/ibatis/ztest/MbGoodsMapper.xml"/>
    </mappers>
</configuration>

编写测试类

package org.apache.ibatis.ztest;

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 org.junit.Test;

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

public class MyTest {

    private static SqlSessionFactory sqlSessionFactory;

    @Test
    public void test01() throws IOException {
        //1、创建SqlSessionFactory
        String resource = "org/apache/ibatis/ztest/mybatis-config.xml";
        final Reader reader = Resources.getResourceAsReader(resource);
        sqlSessionFactory = new SqlSessionFactoryBuilder().build(reader);
        reader.close();
        //2、获取sqlSession
        SqlSession sqlSession = sqlSessionFactory.openSession();
        //3、获取mapper
        MbGoodsMapper mapper = sqlSession.getMapper(MbGoodsMapper.class);
        //4、执行数据库操作，并处理结果集
        MbGoods goods = mapper.selectById("12");
        System.out.println(goods);
    }
}

到此执行成功，可以源码调试了