【精简】mybatis笔记

Mybatis

环境搭建

引入maven依赖

        <!-- mysql-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.28</version>
        </dependency>
        <!-- mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.11</version>
        </dependency>

XML核心配置

创建一个mybatis-config.xml

<configuration>
<!--    引入外部配置文件-->
    <properties resource="db.properties"/>
<!--    environments环境，可配置多个-->
    <environments default="development">
        <environment id="development">
<!--            transactionManager事务管理-->
            <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}"/>
            </dataSource>
        </environment>
    </environments>
<!--    每一个Mapper.xml都需要在Mybatis中注册   查找resources -->
    <mappers>
        <mapper resource="mapper/UserMapper.xml"/>
    </mappers>