关于java:MyBatis源码环境

源码下载

从官网的地址 https://github.com/mybatis/mybatis-3上拉取下来最新版本的代码。我拉取时的版本为3.5.8-SNAPSHOT。

代码调试

导入拉取下来的源码我的项目后，定位到org.apache.ibatis.autoconstructor包的门路下，如下所示：

mybatis-config.xml

批改mybatis-config.xml中的数据源配置。我应用的是mysql数据库，批改driver的值为“com.mysql.cj.jdbc.Driver”。再按依照本人的数据库地址、用户、明码进行配置即可。

<?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" />            <dataSource type="UNPOOLED">                <property name="driver" value="com.mysql.cj.jdbc.Driver"/>                <property name="url" value="jdbc:mysql://xxx.xxx.xxx.xxx/test"/>                <property name="username" value="xxxx"/>                <property name="password" value="xxxx" />            </dataSource>        </environment>    </environments>    <mappers>        <mapper resource="org/apache/ibatis/autoconstructor/AutoConstructorMapper.xml"/>    </mappers></configuration>

CreateDB.sql

拉取下来的源码中应用的mybatis-config.xml应用的是hsqldb数据库。我应用的是mysql数据中，执行运行代码时，执行CreateDB.sql会报错，须要批改下。一共批改了3点：

DROP TABLE语句
extensive_subject表的aBoolean字段类型为tinyint(1)
extensive_subject表的aClob、aBlob字段类型longtext

DROP TABLE IF EXISTS subject;DROP TABLE IF EXISTS extensive_subject;CREATE TABLE subject (  id     INT NOT NULL,  name   VARCHAR(20),  age    INT NOT NULL,  height INT,  weight INT,  active BIT,  dt     TIMESTAMP);CREATE TABLE extensive_subject (  aByte      TINYINT,  aShort     SMALLINT,  aChar      CHAR,  anInt      INT,  aLong      BIGINT,  aFloat     FLOAT,  aDouble    DOUBLE,  aBoolean   tinyint(1),  aString    VARCHAR(255),  anEnum     VARCHAR(50),  aClob      longtext,  aBlob      longtext,  aTimestamp TIMESTAMP);INSERT INTO subject VALUES  (1, 'a', 10, 100, 45, 1, CURRENT_TIMESTAMP),  (2, 'b', 10, NULL, 45, 1, CURRENT_TIMESTAMP),  (2, 'c', 10, NULL, NULL, 0, CURRENT_TIMESTAMP);INSERT INTO extensive_subjectVALUES  (1, 1, 'a', 1, 1, 1, 1.0, 1, 'a', 'AVALUE', 'ACLOB', 'aaaaaabbbbbb', CURRENT_TIMESTAMP),  (2, 2, 'b', 2, 2, 2, 2.0, 2, 'b', 'BVALUE', 'BCLOB', '010101010101', CURRENT_TIMESTAMP),  (3, 3, 'c', 3, 3, 3, 3.0, 3, 'c', 'CVALUE', 'CCLOB', '777d010078da', CURRENT_TIMESTAMP);

AutoConstructorTest

运行AutoConstructorTest的fullyPopulatedSubject办法，查问subject中id为1的数据。我在对应的PrimitiveSubject对象中增加了个toString办法。在fullyPopulatedSubject办法中打印查问出的对象。
代码如下：

  @Test  void fullyPopulatedSubject() {    try (SqlSession sqlSession = sqlSessionFactory.openSession()) {      final AutoConstructorMapper mapper = sqlSession.getMapper(AutoConstructorMapper.class);      final Object subject = mapper.getSubject(1);      System.out.println(subject.toString());      assertNotNull(subject);    }  }