使用mybatis-generator

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1. generator的配置

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<?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>

    <context id="mysqlTables" targetRuntime="MyBatis3">

        <!--是否生成注释-->
        <commentGenerator>
            <property name="suppressAllComments" value="true"/>
            <property name="suppressDate" value="true" />
        </commentGenerator>


        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/mybatis_test"
                        userId="root"
                        password="root">
        </jdbcConnection>

        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>

        <!--生成model类存放位置-->
        <javaModelGenerator targetPackage="com.epoch.mybatis.study.domain" 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="com.epoch.mybatis.study.mapper" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>

        <!--生成dao存放路径-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.epoch.mybatis.study.dao" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>

        <!--需要生成的实体类对应的表-->
        <table tableName="table_02"></table>
    </context>
</generatorConfiguration>

2. maven引入插件

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<!-- https://mvnrepository.com/artifact/org.mybatis.generator/mybatis-generator-core -->
<dependency>
	<groupId>org.mybatis.generator</groupId>
	<artifactId>mybatis-generator-core</artifactId>
	<version>1.3.5</version>
</dependency>

<plugin>
	<groupId>org.mybatis.generator</groupId>
	<artifactId>mybatis-generator-maven-plugin</artifactId>
	<version>1.3.5</version>
	<configuration>
		<verbose>true</verbose>
		<overwrite>true</overwrite>
		<configurationFile>src/main/resources/generatorConfig.xml</configurationFile>
	</configuration>
	<executions>
		<execution>
			<id>Generate MyBatis Artifacts</id>
			<goals>
				<goal>generate</goal>
			</goals>
		</execution>
	</executions>
	<!--这里在插件中手动加入mysql的驱动依赖，否则可能会出错，报找不到驱动包的异常-->
	<dependencies>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>5.1.30</version>
		</dependency>
	</dependencies>
</plugin>

3. idea启动项配置

点击导航栏中的Run -> edit Configurations... -> 添加maven配置，Command line输入：
    mybatis-generator:generate -edit

4. 运行效果

4. 优劣势

优势

可以自动的生成代码，使用XXXExample的方式，可以不用自己写SQL

劣势

这会导致如果滥用的话，导致索引设计不好设计，建立好的索引会因为使用不当而导致索引失效，出现问题之后无法快速定位到问题

所以是否使用Example的方式需要慎重