MyBatis配置文件

1、pom.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.cn</groupId>
    <artifactId>MyBatis_HelloWorld</artifactId>
    <version>1.0-SNAPSHOT</version>
    <!-- 设置打包方式 -->
    <packaging>jar</packaging>

    <dependencies>
        <!-- MyBatis依赖 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.7</version>
        </dependency>

        <!-- JUnit依赖 -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>

        <!-- MySQL依赖 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.37</version>
        </dependency>

        <!-- log4j依赖 -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>

        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
            <version>5.2.0</version>
        </dependency>
    </dependencies>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    
</project>

resources下的mybatis-config.xml

<?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>
    <properties resource="db.properties"></properties>
    <settings>
            <!--开启驼峰命名自动映射-->
            <setting name="mapUnderscoreToCamelCase" value="true"/>
            <!--开启延迟加载-->
            <setting name="lazyLoadingEnabled" value="true"/>
            <!--关闭积极加载-->
            <setting name="aggressiveLazyLoading" value="false"/>
            <!--开启二级缓存的全局配置-->
            <setting name="cacheEnabled" value="true"/>
    </settings>

    <typeAliases><!-- 给返回值类型起别名 默认是类名-->
        <!-- <typeAlias type="com.cn.pojo.User" ></typeAlias>-->
        <!--直接指定一个包，默认是类名-->
        <package name="com.cn.pojo"/>
    </typeAliases>
    <!-- 配置数据源 -->
    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <!-- 配置数据库驱动 -->
                <property name="driver" value="${db.driver}"/>
                <!-- 配置数据库地址 -->
                <property name="url" value="${db.url}"/>
                <!-- 连接数据库所需的用户名 -->
                <property name="username" value="${db.username}"/>
                <!-- 连接数据库所需的密码 -->
                <property name="password" value="${db.password}"/>
            </dataSource>
        </environment>
    </environments>
    <!-- 设置mapper的路径 -->
    <mappers>
        <!-- 注意是//-->
        <package name="com.cn.mapper"/>
    </mappers>
    <plugins>
        <plugin interceptor="com.github.pagehelper.PageInterceptor"></plugin>
    </plugins>
</configuration>