mybatis-generator的使用心得

之前开发了一个亚健康测评系统，使用的是SSM框架，里面第一次使用到了mybatis-generator逆向代码生成工具，很方便，省去了基本的增删改查的mapper文件及sql的编写，还能避免错误，这里推荐一下！

当然，使用该工具的前提是你得有这个工具。他的下载地址为：https://github.com/mybatis/generator/releases

如果使用Maven就不需要下载了，见pom.xml文件配置即可

在你建好数据库的前提下，该工具才能发挥作用，而且数据表必须包含主键，生成的select方法都是根据主键查找的。

以下是配置文件

pom.xml中加入插件

<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>

generatorConfig.xml的具体配置

<?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>
    <!-- 数据库配置文件 -->
    <properties resource="db.properties" />
    
    <context id="context1">
        <property name="javaFileEncoding" value="UTF-8" />
        <property name="autoDelimitKeywords" value="true" />
        <property name="javaFormatter" value="org.mybatis.generator.api.dom.DefaultJavaFormatter" />
        <property name="xmlFormatter" value="org.mybatis.generator.api.dom.DefaultXmlFormatter" />
        
        <!-- 注释生成规则 -->
        <commentGenerator type="org.mybatis.generator.internal.HairyCommentGenerator">
            <property name="suppressAllComments" value="false" />
            <property name="suppressDate" value="true" />
        </commentGenerator>
        
        <!-- 数据库连接 -->
        <jdbcConnection driverClass="${driver}" connectionURL="${url}" userId="${user}" password="${password}" />

        <!-- 数据库的生成配置 -->
        <javaModelGenerator targetPackage="com.lsd.bean" targetProject="${project.dir}/src/main/java" />
        <sqlMapGenerator targetPackage="com.lsd.dao" targetProject="${project.dir}/src/main/resources" />
        <javaClientGenerator targetPackage="com.lsd.dao" targetProject="${project.dir}/src/main/java" type="XMLMAPPER" />
        
        <!-- 以上部分配置固定，无需改动，此处往下开始项目设置 -->
        
        <!-- user表 -->
        <table tableName="user" domainObjectName="User">
            <property name="useActualColumnNames" value="true" />
            <generatedKey column="id" sqlStatement="SELECT LAST_INSERT_ID()" identity="true" />
        </table>
        <!-- Account表 -->
        <table tableName="Account" domainObjectName="Account">
            <property name="useActualColumnNames" value="true" />
            <generatedKey column="id" sqlStatement="SELECT LAST_INSERT_ID()" identity="true" />
        </table>
        <!-- qbank表 -->
        <table tableName="Qbank" domainObjectName="Qbank">
            <property name="useActualColumnNames" value="true" />
            <generatedKey column="id" sqlStatement="SELECT LAST_INSERT_ID()" identity="true" />
        </table>
        <!-- Questionfiles表 -->
        <table tableName="Questionfiles" domainObjectName="Questionfiles">
            <property name="useActualColumnNames" value="true" />
            <generatedKey column="id" sqlStatement="SELECT LAST_INSERT_ID()" identity="true" />
        </table>
        <!-- TestRecord表 -->
        <table tableName="TestRecord" domainObjectName="TestRecord">
            <property name="useActualColumnNames" value="true" />
            <generatedKey column="id" sqlStatement="SELECT LAST_INSERT_ID()" identity="true" />
        </table>
        <!-- EvaludateScore表 -->
        <table tableName="EvaludateScore" domainObjectName="EvaludateScore">
            <property name="useActualColumnNames" value="true" />
            <generatedKey column="id" sqlStatement="SELECT LAST_INSERT_ID()" identity="true" />
        </table>
        <!-- TestAdvice表 -->
        <table tableName="TestAdvice" domainObjectName="TestAdvice">
            <property name="useActualColumnNames" value="true" />
            <generatedKey column="id" sqlStatement="SELECT LAST_INSERT_ID()" identity="true" />
        </table>
    </context>
</generatorConfiguration>

spring-mybatis.xml的具体配置

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                        http://www.springframework.org/schema/beans/spring-beans.xsd
                        http://www.springframework.org/schema/context 
                        http://www.springframework.org/schema/context/spring-context-3.2.xsd">
    <!-- 自动扫描 -->
    <context:component-scan base-package="com.lsd.controller,com.lsd.filter" />

    <!-- 引入配置文件 -->
    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">  
        <property name="locations" value="classpath:db.properties"/>  
    </bean>  

    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${driver}" />
        <property name="jdbcUrl" value="${url}" />
        <property name="user" value="${user}" />
        <property name="password" value="${password}" />
    </bean>

    <!-- spring和MyBatis完美整合，不需要mybatis的配置映射文件 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 注入数据源 -->
        <property name="dataSource" ref="dataSource" />
        <!-- 自动扫描mapper.xml文件 -->
        <property name="mapperLocations">
            <array>
                <value>classpath:com/lsd/dao/custom/*.xml</value>
                <value>classpath:com/lsd/dao/*.xml</value>
            </array>
        </property>
    </bean>

    <!-- DAO接口所在包名，Spring会自动查找其下的类 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.lsd.dao" />
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
    </bean>

    <!-- 事务管理 -->
    <bean id="transactionManager"
        class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>

</beans>

这个系统的编写我用的是Intellij IDEA，用了Maven，所以使用生成工具可以直接使用maven的命令提示符，具体的生成语句是mvn mybatis-generator:generate ，一旦数据库进行了更改，都需使用这句代码重新生成bean、dao、mapper文件