mybatis-generator學習入門

公司用了mybatis-generator（一下簡稱MG）是以在網上找資料自己學習了一下。

用IDE的是IDEA，因為現在IDEA的MG插件需要收費，是以使用了maven把插件引入進來，POM檔案如下：

<?xml version="1.0" encoding="UTF-8"?>
<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">
    <parent>
        <artifactId>mypractice</artifactId>
        <groupId>mypractice</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>mybatisgenerator</artifactId>
    <dependencies>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.2.8</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.3.3</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-maven-plugin</artifactId>
            <version>1.3.3</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.38</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.3</version>
                <configuration>
                    <verbose>true</verbose>
                    <overwrite>true</overwrite>
                </configuration>
                <dependencies>
                    <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java      

配置這個依賴主要是為了等下在配置MG的時候可以不用配置classPathEntry這樣的一個屬性，避免      

代碼的耦合度太高 -->
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>5.1.38</version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
    </build>
</project>      

下面看一下MG的配置檔案：generatorConfig.xml和generatorConfig.properties      

generatorConfig.xml：      
   

<?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>

  <context id="mybatisgenerator" targetRuntime="MyBatis3">
    <plugin type="org.mybatis.generator.plugins.EqualsHashCodePlugin" />
    <plugin type="org.mybatis.generator.plugins.SerializablePlugin" />
    <plugin type="org.mybatis.generator.plugins.CaseInsensitiveLikePlugin" />
    <!-- <plugin type="org.mybatis.generator.plugins.ToStringPlugin"></plugin> -->
    <commentGenerator>
      <property name="suppressDate" value="true" />
      <property name="suppressAllComments" value="true" />
    </commentGenerator>
    <!-- 
    <jdbcConnection driverClass="oracle.jdbc.driver.OracleDriver" connectionURL="jdbc:oracle:thin:@10.100.1.20:1521:db1"
      userId="rams_test" password="bangsun">
    </jdbcConnection>
    -->
       <jdbcConnection driverClass="com.mysql.jdbc.Driver"
         connectionURL="jdbc:mysql://127.0.0.1:3306/mybatis" userId="root" password="root">
      </jdbcConnection>
      
    <javaTypeResolver>
      <property name="forceBigDecimals" value="false" />
    </javaTypeResolver>

    <javaModelGenerator targetPackage="cn.com.bsfit.frms.ds.pojo" targetProject="src/main/java">
      <property name="constructorBased" value="true" />    
      <property name="enableSubPackages" value="true" />
      <property name="trimStrings" value="true" />
    </javaModelGenerator>

    <sqlMapGenerator targetPackage="cn.com.bsfit.frms.ds.sqlmap" targetProject="src/main/resources">
      <property name="enableSubPackages" value="true" />
    </sqlMapGenerator>

    <javaClientGenerator type="XMLMAPPER" targetPackage="cn.com.bsfit.frms.ds.mapper"
      targetProject="src/main/java">
      <property name="enableSubPackages" value="true" />
    </javaClientGenerator>


    <table schema="mybatis" tableName="user" domainObjectName="User"> 
           <property name="constructorBased" value="true" />
         <property name="useActualColumnNames" value="false" />       
         <property name="ignoreQualifiersAtRuntime" value="true" />     
    </table>      
    
</context>
</generatorConfiguration>       
    
generatorConfig.properties：      
    
這個檔案主要是配置上面的xml檔案中的      
    
在       
generatorConfiguration 元素節點下添加一個元素      
    
<properties resource="generatorConfig.properties" />      
        
就可以寫成下面這樣了      
    
<jdbcConnection driverClass="${driver}"
   connectionURL="${url}" userId="${username}" password="${password}">
</jdbcConnection>      
   
   
        
，這樣就修改和維護起來比較友善      
    
driver=com.mysql.jdbc.Driver
url=jdbc:mysql://127.0.0.1:3306/mybatis
username=root
password=root
#path=E:/code/jar/mysql/mysql-connector-java/5.1.38/mysql-connector-java-5.1.38.jar      
    
看一生成之後的檔案目錄：