开始结构图

maven文件引入

<?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.ding</groupId>
    <artifactId>mybatis_generator</artifactId>
    <version>1.0-SNAPSHOT</version>
<dependencies>
    <dependency>
        <groupId>org.mybatis.generator</groupId>
        <artifactId>mybatis-generator-core</artifactId>
        <version>1.3.7</version>
    </dependency>
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.7</version>
        <scope>compile</scope>
    </dependency>


</dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.2</version>
                <configuration>
                    <!--配置文件的位置-->
                    <configurationFile>
                        src/main/resources/generatorConfig.xml
                    </configurationFile>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

数据库

| Create Table                                       |
| -------------------------------------------------- |
| CREATE TABLE `student` (                           |
| `id` int(11) NOT NULL AUTO_INCREMENT,              |
| `NAME` varchar(20) DEFAULT NULL,                   |
| `age` int(11) DEFAULT NULL,                        |
| PRIMARY KEY (`id`)                                 |
| ) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=u |

编写generatorConfig.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
    <!--数据库驱动写自己jar包的位置-->
    <classPathEntry location="D:\develop\apache-maven-3.6.1\mvn_repository\mysql\mysql-connector-java\5.1.47\mysql-connector-java-5.1.47.jar"/>
    <!-- 一个数据库一个context -->
    <context id="MYTables" targetRuntime="MyBatis3">
        <commentGenerator>
            <!--suppressDate:**阻止**生成的注释包含时间戳-->
            <property name="suppressDate" value="true"/>
            <!--suppressAllComments:**阻止**生成注释-->
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>
        <!--数据库链接地址账号密码-->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/db1"
                        userId="root" password="root">
        </jdbcConnection>
        <javaTypeResolver>
            <!--控制是否强制DECIMAL和NUMERIC类型的字段转换为Java类型的
            java.math.BigDecimal-->
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>
        <!--生成Model类存放位置-->
        <javaModelGenerator targetPackage="com.ding.pojo"
                            targetProject="src\main\java">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>
        <!--生成映射文件存放位置-->
        <sqlMapGenerator targetPackage="mapper"
                         targetProject="src\main\resources">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>
        <!--生成Dao类存放位置-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.ding.dao"
                             targetProject="src\main\java">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>
        <!--生成对应表及类名-->
        <table tableName="student" domainObjectName="student" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"/>

    </context>
</generatorConfiguration>

生成

生成后的结构图