手记

利用mybatis-generator自动生成代码

mybatis-generator有三种用法:命令行、eclipse插件、maven插件。个人觉得maven插件最方便,可以在eclipse/intellij idea等ide上可以通用。

下面是从官网上的截图:(不过官网www.mybatis.org 最近一段时间,好象已经挂了)

一、在pom.xml中添加plugin

 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>

其中generatorConfig.xml的位置,大家根据实际情况自行调整

二、generatorConfig.xml配置文件

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE generatorConfiguration
 3         PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
 4         "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
 5 
 6 <generatorConfiguration>
 7     <classPathEntry
 8             location="C:/Oracle/Middleware/wlserver_10.3/server/lib/ojdbc6.jar"/>
 9     <context id="my" targetRuntime="MyBatis3">
10         <commentGenerator>
11             <property name="suppressDate" value="false"/>
12             <property name="suppressAllComments" value="true"/>
13         </commentGenerator>
14 
15         <jdbcConnection driverClass="oracle.jdbc.driver.OracleDriver"
16                         connectionURL="jdbc:oracle:thin:@172.20.16.***:1521:CARGO" userId="***"
17                         password="***"/>
18 
19         <javaModelGenerator targetPackage="ctas.test.entity"
20                             targetProject="D:/yangjm/Code/CTAS/JAVAEE/CTAS2CCSP/src/main/java">
21             <property name="enableSubPackages" value="true"/>
22             <property name="trimStrings" value="true"/>
23         </javaModelGenerator>
24 
25         <sqlMapGenerator targetPackage="ctas.test.entity.xml"
26                          targetProject="D:/yangjm/Code/CTAS/JAVAEE/CTAS2CCSP/src/main/java">
27             <property name="enableSubPackages" value="true"/>
28         </sqlMapGenerator>
29 
30         <javaClientGenerator targetPackage="ctas.test.mapper"
31                              targetProject="D:/yangjm/Code/CTAS/JAVAEE/CTAS2CCSP/src/main/java" type="XMLMAPPER">
32             <property name="enableSubPackages" value="true"/>
33         </javaClientGenerator>
34 
35         <!--<table tableName="T_FEE_AGTBILL" domainObjectName="FeeAgentBill"
36                enableCountByExample="false" enableUpdateByExample="false"
37                enableDeleteByExample="false" enableSelectByExample="false"
38                selectByExampleQueryId="false"/>-->
39 
40         <table tableName="CTAS_FEE_BASE" domainObjectName="FeeBase"
41                enableCountByExample="false" enableUpdateByExample="false"
42                enableDeleteByExample="false" enableSelectByExample="false"
43                selectByExampleQueryId="false">
44             <!--<columnRenamingRule searchString="^D_"
45                                 replaceString=""/>-->
46         </table>
47 
48     </context>
49 </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

 

最后给出目录结构图:

最后给一些小技巧:

a) 建表时,字段名称建议用"_"分隔多个单词,比如:AWB_NO、REC_ID...,这样生成的entity,属性名称就会变成漂亮的驼峰命名,即:awbNo、recId

b)oracle中,数值形的字段,如果指定精度,比如Number(12,2),默认生成entity属性是BigDecimal型 ,如果不指定精度,比如:Number(9),指默认生成的是Long型

c)oracle中的nvarchar/nvarchar2,mybatis-generator会识别成Object型,建议不要用nvarchar2,改用varchar2

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