mybatis自动生成文件

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

 

如果想要指定对应的pom.xml文件，可以mvn mybatis-generator:generate -f pom-mybatis.xml去执行，只要创建一个pom-mybatis.xml

对应内容：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.isoubu</groupId>
  <artifactId>website</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <name>mybatis_generator</name>
  
   <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.35</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.3.2</version>
        </dependency>
    </dependencies>
    <build>
        <pluginManagement>
            <plugins>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <configuration>
                        <source>1.7</source>
                        <target>1.7</target>
                    </configuration>
                    <version>3.3</version>
                </plugin>
                <plugin>
                    <groupId>org.mybatis.generator</groupId>
                    <artifactId>mybatis-generator-maven-plugin</artifactId>
                    <version>1.3.2</version>
                    <dependencies>
                        <dependency>
                            <groupId>mysql</groupId>
                            <artifactId>mysql-connector-java</artifactId>
                            <version>5.1.35</version>
                        </dependency>
                    </dependencies>
                    <configuration>
                         <!--配置文件的路径-->
                         
                         <configurationFile>D:/com/work/operate-system/operationSystem/src/main/resources/generatorConfig.xml</configurationFile>
                         
                        <overwrite>true</overwrite>
                    </configuration>
                </plugin>
            </plugins>
        </pluginManagement>
    </build>
    
</project>