使用mybatis-generator自动生成sql代码，使用maven插件

一、在pom.xml中添加plugin

<plugin>
    <groupId>org.mybatis.generator</groupId>
    <artifactId>mybatis-generator-maven-plugin</artifactId>
    <version>1.3.2</version>
    <configuration>
        <configurationFile>src/main/resources/mybatis-generator/generatorConfig.xml</configurationFile>
        <verbose>true</verbose>
        <overwrite>true</overwrite>
    </configuration>
    <executions>
        <execution>
            <id>Generate MyBatis Artifacts</id>
            <goals>
                <goal>generate</goal>
            </goals>
        </execution>
    </executions>
    <dependencies>
        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.3.2</version>
        </dependency>
    </dependencies>
</plugin>
           

二、generatorConfig.xml配置文件

<?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-->
   <classPathEntry    location="D:\mysql-connector-java-5.1.38.jar"/>
    <context id="DB2Tables" targetRuntime="MyBatis3">
        <commentGenerator>
            <property name="suppressDate" value="true"/>
            <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/db" userId="root"
                        password="123456">
        </jdbcConnection>
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>
        <!--生成Model类存放位置--> <!--这里的targetpackage对应的是java下面的目录 -->
        <javaModelGenerator targetPackage="com.example.entity" targetProject="src/main/java"> <!-- src/main/resorce对应的是代码工程-->
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>
        <!--mapper xml-->   <!--这里的targetpackage对应的是resource下面的目录 -->
        <sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources"> <!-- src/main/resorce对应的是资源工程-->
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>
        <!--mapper java -->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.example.mapper" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>
        <!--生成对应表及类名-->
        <table tableName="good" domainObjectName="Good" enableCountByExample="true" enableUpdateByExample="true"
               enableDeleteByExample="true" enableSelectByExample="true" selectByExampleQueryId="true"></table>
    </context>
</generatorConfiguration>
           

几个要点：

a) 因为生成过程中需要连接db，所以第3行指定了驱动jar包的位置

b) 15-17行为连接字符串

c) 19-33行指定生成“entity实体类、mybatis映射xml文件、mapper接口”的具体位置

d) 40-46行为具体要生成的表，如果有多个表，复制这一段，改下表名即可

三、使用方式

mvn mybatis-generator:generate

如果是在intellij 环境，直接鼠标点击即可