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

 1 <plugin>
 2     <groupId>org.mybatis.generator</groupId>
 3     <artifactId>mybatis-generator-maven-plugin</artifactId>
 4     <version>1.3.2</version>
 5     <configuration>
 6         <configurationFile>src/main/resources/mybatis-generator/generatorConfig.xml</configurationFile>
 7         <verbose>true</verbose>
 8         <overwrite>true</overwrite>
 9     </configuration>
10     <executions>
11         <execution>
12             <id>Generate MyBatis Artifacts</id>
13             <goals>
14                 <goal>generate</goal>
15             </goals>
16         </execution>
17     </executions>
18     <dependencies>
19         <dependency>
20             <groupId>org.mybatis.generator</groupId>
21             <artifactId>mybatis-generator-core</artifactId>
22             <version>1.3.2</version>
23         </dependency>
24     </dependencies>
25 </plugin>

generatorConfig.xml的具体配置

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN" "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd" >
 3 <generatorConfiguration>
 4     <!-- 数据库配置文件 -->
 5     <properties resource="db.properties" />
 6
 7     <context id="context1">
 8         <property name="javaFileEncoding" value="UTF-8" />
 9         <property name="autoDelimitKeywords" value="true" />
10         <property name="javaFormatter" value="org.mybatis.generator.api.dom.DefaultJavaFormatter" />
11         <property name="xmlFormatter" value="org.mybatis.generator.api.dom.DefaultXmlFormatter" />
12
13         <!-- 注释生成规则 -->
14         <commentGenerator type="org.mybatis.generator.internal.HairyCommentGenerator">
15             <property name="suppressAllComments" value="false" />
16             <property name="suppressDate" value="true" />
17         </commentGenerator>
18
19         <!-- 数据库连接 -->
20         <jdbcConnection driverClass="${driver}" connectionURL="${url}" userId="${user}" password="${password}" />
21
22         <!-- 数据库的生成配置 -->
23         <javaModelGenerator targetPackage="com.lsd.bean" targetProject="${project.dir}/src/main/java" />
24         <sqlMapGenerator targetPackage="com.lsd.dao" targetProject="${project.dir}/src/main/resources" />
25         <javaClientGenerator targetPackage="com.lsd.dao" targetProject="${project.dir}/src/main/java" type="XMLMAPPER" />
26
27         <!-- 以上部分配置固定，无需改动，此处往下开始项目设置 -->
28
29         <!-- user表 -->
30         <table tableName="user" domainObjectName="User">
31             <property name="useActualColumnNames" value="true" />
32             <generatedKey column="id" sqlStatement="SELECT LAST_INSERT_ID()" identity="true" />
33         </table>
34         <!-- Account表 -->
35         <table tableName="Account" domainObjectName="Account">
36             <property name="useActualColumnNames" value="true" />
37             <generatedKey column="id" sqlStatement="SELECT LAST_INSERT_ID()" identity="true" />
38         </table>
39         <!-- qbank表 -->
40         <table tableName="Qbank" domainObjectName="Qbank">
41             <property name="useActualColumnNames" value="true" />
42             <generatedKey column="id" sqlStatement="SELECT LAST_INSERT_ID()" identity="true" />
43         </table>
44         <!-- Questionfiles表 -->
45         <table tableName="Questionfiles" domainObjectName="Questionfiles">
46             <property name="useActualColumnNames" value="true" />
47             <generatedKey column="id" sqlStatement="SELECT LAST_INSERT_ID()" identity="true" />
48         </table>
49         <!-- TestRecord表 -->
50         <table tableName="TestRecord" domainObjectName="TestRecord">
51             <property name="useActualColumnNames" value="true" />
52             <generatedKey column="id" sqlStatement="SELECT LAST_INSERT_ID()" identity="true" />
53         </table>
54         <!-- EvaludateScore表 -->
55         <table tableName="EvaludateScore" domainObjectName="EvaludateScore">
56             <property name="useActualColumnNames" value="true" />
57             <generatedKey column="id" sqlStatement="SELECT LAST_INSERT_ID()" identity="true" />
58         </table>
59         <!-- TestAdvice表 -->
60         <table tableName="TestAdvice" domainObjectName="TestAdvice">
61             <property name="useActualColumnNames" value="true" />
62             <generatedKey column="id" sqlStatement="SELECT LAST_INSERT_ID()" identity="true" />
63         </table>
64     </context>
65 </generatorConfiguration>

spring-mybatis.xml的具体配置

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4        xmlns:context="http://www.springframework.org/schema/context"
 5        xsi:schemaLocation="http://www.springframework.org/schema/beans
 6                         http://www.springframework.org/schema/beans/spring-beans.xsd
 7                         http://www.springframework.org/schema/context
 8                         http://www.springframework.org/schema/context/spring-context-3.2.xsd">
 9     <!-- 自动扫描 -->
10     <context:component-scan base-package="com.lsd.controller,com.lsd.filter" />
11
12     <!-- 引入配置文件 -->
13     <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
14         <property name="locations" value="classpath:db.properties"/>
15     </bean>
16
17     <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
18         <property name="driverClass" value="${driver}" />
19         <property name="jdbcUrl" value="${url}" />
20         <property name="user" value="${user}" />
21         <property name="password" value="${password}" />
22     </bean>
23
24     <!-- spring和MyBatis完美整合，不需要mybatis的配置映射文件 -->
25     <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
26         <!-- 注入数据源 -->
27         <property name="dataSource" ref="dataSource" />
28         <!-- 自动扫描mapper.xml文件 -->
29         <property name="mapperLocations">
30             <array>
31                 <value>classpath:com/lsd/dao/custom/*.xml</value>
32                 <value>classpath:com/lsd/dao/*.xml</value>
33             </array>
34         </property>
35     </bean>
36
37     <!-- DAO接口所在包名，Spring会自动查找其下的类 -->
38     <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
39         <property name="basePackage" value="com.lsd.dao" />
40         <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
41     </bean>
42
43     <!-- 事务管理 -->
44     <bean id="transactionManager"
45         class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
46         <property name="dataSource" ref="dataSource" />
47     </bean>
48
49 </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