玄子Share - Mybatis 项目模板使用指南

项目结构图

mybatis-config.xml 配置模板设置

参数

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "https://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration><properties resource="database.properties"/><settings><!--        <setting name="logImpl" value="LOG4J2"/>--><!--        <setting name="cacheEnabled" value="true"/>--><setting name="mapUnderscoreToCamelCase" value="true"/></settings><typeAliases><!--        <typeAlias type="com.xuanzi.mybatis.entity.Student" alias="Student"/>--><!--        等同于实体类上添加 @Alias("别名")--><package name="${PACKAGE_NAME}.entity"/><!--开启驼峰命名转换--></typeAliases><environments default="development"><environment id="development"><transactionManager type="JDBC"/><dataSource type="POOLED"><property name="driver" value="${@driver}"/><property name="url" value="${@url}"/><property name="username" value="${@username}"/><property name="password" value="${@password}"/><!--将此处的 @ 删掉--></dataSource></environment></environments><mappers><!--        <mapper resource="com/xuanzi/mybatis/dao/StudentMapper.xml"/>--><!--        <mapper class="com.xuanzi.mybatis.dao.StudentMapper"/>--><!--        类名与XML文件名须一致--><!--        <mapper url="file:///com/xuanzi/mybatis/dao/StudentMapper.xml"/>--><package name="${PACKAGE_NAME}.dao"/></mappers>
</configuration><!--<build>--><!--<resources>--><!--    <resource>--><!--        <directory>src/main/java</directory>--><!--        <includes>--><!--            <include>**/*.xml</include>--><!--            <include>**/*.properties</include>--><!--        </includes>--><!--    </resource>--><!--    <resource>--><!--        <directory>src/main/resources</directory>--><!--        <includes>--><!--            <include>**/*.xml</include>--><!--            <include>**/*.properties</include>--><!--        </includes>--><!--    </resource>--><!--</resources>--><!--</build>--><!--将此内容添加至 pom.xml -->

需求

1. ${PACKAGE_NAME}.entity ${PACKAGE_NAME}.dao 需要用到项目路径，所以需在项目内创建完成后再剪切到resources文件夹
2. ${@password}需要将此处的@符号删除掉，使用Ctrl + F查找替换@

database.properties 数据库配置模板设置

参数

driver=com.mysql.cj.jdbc.Driver
url=jdbc:mysql://localhost:3306/myschool?useUnicode=TRUE&characterEncoding=UTF-8&serverTimezone=GMT-8
username=root
password=root

需求

1. 将连接数据库的myschool改为自己的数据库

MybatisMapper.java 工具类模板设置

参数

#if (${PACKAGE_NAME} && ${PACKAGE_NAME} != "")package ${PACKAGE_NAME};#endimport 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;public class MybatisMapper {private static final SqlSessionFactory sqlSessionFactory;static {String resource = "mybatis-config.xml";InputStream inputStream = null;try {inputStream = Resources.getResourceAsStream(resource);sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);} catch (IOException e) {throw new RuntimeException(e);}}public static SqlSession getSqlSession() {return sqlSessionFactory.openSession(true);// true 为自动提交事务}
}

需求

1. 注意mybatis-config.xml配置文件名称是否一致
2. openSession(true);已开启自动提交事务

EntityMapper.xml XML 映射模板设置

参数

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "https://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="${PACKAGE_NAME}.${NAME}"></mapper>

需求

1. 注意文件命名规范

运行 Main

public static void main(String[] args) {SqlSession sqlSession = MybatisMapper.getSqlSession();StudentMapper mapper = sqlSession.getMapper(StudentMapper.class);List<Student> studentList = mapper.selectStudent();studentList.forEach(System.out::println);
}

玄子Share - Mybatis 项目模板使用指南 8.4