[一步是咫尺，一步即天涯]

經過前文的敘述，各位看官是不是已經被Mybatis的強大功能給折服了呢？本文我們將介紹一個能夠極大提升我們開發效率的插件：即代碼自動生成。這里的代碼自動生成包括，與數據庫一一對應的實體對象，Mapper基本結構文件，與Mapper對應的基本接口文件。本文，我們只介紹這個插件的基本用法，更多內容，就請讀者先自行學習吧。

準備工作：

a.操作系統?：win7 x64

b.基本軟件：MySQL，Mybatis，SQLyog

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第一種方式：通過Main方法執行配置文件。

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1.創建本文我們將使用的工程Mybatis13，工程結構圖如下：【重點文件我們給出，其他配置文件請讀者參考前文工程】

2.修改jdbc.properties文件，具體內容如下：

[plain]?view plaincopy

jdbc.driverClassName=com.mysql.jdbc.Driver??

jdbc.url=jdbc:mysql://localhost:3306/mybatis??

jdbc.username=root??

jdbc.password=1234??

3.修改log4j.properties，具體內容如下：

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log4j.rootLogger=debug,stdout??

log4j.appender.stdout=org.apache.log4j.ConsoleAppender??

log4j.appender.stdout.layout=org.apache.log4j.PatternLayout??

log4j.appender.stdout.layout.ConversionPattern=%5p?[%t]?-?%m%n??

4.修改mbgConfiguration.xml，具體內容如下：

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<?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>????

????<properties?resource="jdbc.properties"?/>????

????<context?id="sqlserverTables"?targetRuntime="MyBatis3">????

????????<!--?生成的pojo，將implements?Serializable-->????

????????<plugin?type="org.mybatis.generator.plugins.SerializablePlugin"></plugin>????

????????<commentGenerator>????

????????????<!--?是否去除自動生成的注釋?true：是?：?false:否?-->????

????????????<property?name="suppressAllComments"?value="true"?/>????

????????</commentGenerator>????

????

????????<!--?數據庫鏈接URL、用戶名、密碼?-->????

????????<jdbcConnection?driverClass="${jdbc.driverClassName}"????

????????????????????????connectionURL="${jdbc.url}"????

????????????????????????userId="${jdbc.username}"????

????????????????????????password="${jdbc.password}">????

????????</jdbcConnection>????

????

????????<!--??????

????????默認false，把JDBC?DECIMAL?和?NUMERIC?類型解析為?Integer????

????????????true，把JDBC?DECIMAL?和?NUMERIC?類型解析為java.math.BigDecimal??????

????????-->????

????????<javaTypeResolver>????

????????????<property?name="forceBigDecimals"?value="false"?/>????

????????</javaTypeResolver>????

????

????????<!--?????

????????生成model模型，對應的包路徑，以及文件存放路徑(targetProject)，targetProject可以指定具體的路徑,如./src/main/java，????

????????也可以使用“MAVEN”來自動生成，這樣生成的代碼會在target/generatord-source目錄下????

????????-->????

????????<!--<javaModelGenerator?targetPackage="com.joey.mybaties.test.pojo"?targetProject="MAVEN">-->????

????????<javaModelGenerator?targetPackage="com.csdn.ingo.entity"?targetProject="./src/main/java">????

????????????<property?name="enableSubPackages"?value="true"/>????

????????????<!--?從數據庫返回的值被清理前后的空格??-->????

????????????<property?name="trimStrings"?value="true"?/>????

????????</javaModelGenerator>????

????

????????<!--對應的mapper.xml文件??-->????

????????<sqlMapGenerator?targetPackage="mappers"?targetProject="./src/main/resources">????

????????????<property?name="enableSubPackages"?value="true"/>????

????????</sqlMapGenerator>????

????

????????<!--?對應的Mapper接口類文件?-->????

????????<javaClientGenerator?type="XMLMAPPER"?targetPackage="com.csdn.ingo.dao"?targetProject="./src/main/java">????

????????????<property?name="enableSubPackages"?value="true"/>????

????????</javaClientGenerator>????

????

????

????????<!--?列出要生成代碼的所有表，這里配置的是不生成Example文件?-->????

????????<table?tableName="userinfo"?domainObjectName="UserInfoPO"????

???????????????enableCountByExample="false"?enableUpdateByExample="false"?enableDeleteByExample="false"????

???????????????enableSelectByExample="false"?selectByExampleQueryId="false"?>????

????????????<property?name="useActualColumnNames"?value="false"/>????

????????</table>????

????</context>????

</generatorConfiguration>??????

5.修改GenMain.java文件，具體內容如下：

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package?com.csdn.ingo.main;??

??

import?java.io.File;??

import?java.io.IOException;??

import?java.sql.SQLException;??

import?java.util.ArrayList;??

import?java.util.List;??

??

import?org.mybatis.generator.api.MyBatisGenerator;??

import?org.mybatis.generator.config.Configuration;??

import?org.mybatis.generator.config.xml.ConfigurationParser;??

import?org.mybatis.generator.exception.InvalidConfigurationException;??

import?org.mybatis.generator.exception.XMLParserException;??

import?org.mybatis.generator.internal.DefaultShellCallback;??

??

public?class?GenMain?{??

????public?static?void?main(String[]?args)?{??

????????List<String>?warnings?=?new?ArrayList<String>();??

????????boolean?overwrite?=?true;??

????????String?genCfg?=?"/mbgConfiguration.xml";??

????????File?configFile?=?new?File(GenMain.class.getResource(genCfg).getFile());??

????????ConfigurationParser?cp?=?new?ConfigurationParser(warnings);??

????????Configuration?config?=?null;??

????????try?{??

????????????config?=?cp.parseConfiguration(configFile);??

????????}?catch?(IOException?e)?{??

????????????e.printStackTrace();??

????????}?catch?(XMLParserException?e)?{??

????????????e.printStackTrace();??

????????}??

????????DefaultShellCallback?callback?=?new?DefaultShellCallback(overwrite);??

????????MyBatisGenerator?myBatisGenerator?=?null;??

????????try?{??

????????????myBatisGenerator?=?new?MyBatisGenerator(config,?callback,?warnings);??

????????}?catch?(InvalidConfigurationException?e)?{??

????????????e.printStackTrace();??

????????}??

????????try?{??

????????????myBatisGenerator.generate(null);??

????????}?catch?(SQLException?e)?{??

????????????e.printStackTrace();??

????????}?catch?(IOException?e)?{??

????????????e.printStackTrace();??

????????}?catch?(InterruptedException?e)?{??

????????????e.printStackTrace();??

????????}??

????}??

}??

6.測試方法：運行main方法，然后刷新工程即可。正常情況下：控制臺能夠看到如下輸出，刷新工程后項目列表也能夠看到填充文件的變化。

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在上面的mbgConfiguration.xml文件中，我們在給出一份更加詳細的官方配置地址供讀者參考，如下：

【英文版】http://www.mybatis.org/generator/configreference/xmlconfig.html

【中文版】http://generator.sturgeon.mopaas.com/configreference/table.html

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第二種方式：通過Maven插件運行。

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上面我們的工程是通過maven構建的，mybatis generator中也包含了一個可以集成到Maven的插件，具體做法如下：

1.修改pom.xml文件如下：

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<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.java.mybatis</groupId>??

????<artifactId>mybatis13</artifactId>??

????<version>0.0.1-SNAPSHOT</version>??

????<packaging>jar</packaging>??

??

????<name>mybatis13</name>??

????<url>http://maven.apache.org</url>??

??

????<properties>??

????????<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>??

????</properties>??

??

????<dependencies>??

????????<dependency>??

????????????<groupId>junit</groupId>??

????????????<artifactId>junit</artifactId>??

????????????<version>4.12</version>??

????????????<scope>test</scope>??

????????</dependency>??

????????<dependency>??

????????????<groupId>org.mybatis</groupId>??

????????????<artifactId>mybatis</artifactId>??

????????????<version>3.3.1</version>??

????????</dependency>??

????????<dependency>??

????????????<groupId>mysql</groupId>??

????????????<artifactId>mysql-connector-java</artifactId>??

????????????<version>5.1.26</version>??

????????</dependency>??

????????<dependency>??

????????????<groupId>org.mybatis.generator</groupId>??

????????????<artifactId>mybatis-generator-core</artifactId>??

????????????<version>1.3.2</version>??

????????</dependency>??

????????<dependency>??

????????????<groupId>log4j</groupId>??

????????????<artifactId>log4j</artifactId>??

????????????<version>1.2.17</version>??

????????</dependency>??

????</dependencies>??

????<build>??

????????<plugins>??

????????????<plugin>??

????????????????<groupId>org.mybatis.generator</groupId>??

????????????????<artifactId>mybatis-generator-maven-plugin</artifactId>??

????????????????<version>1.3.2</version>??

????????????????<configuration>??

????????????????????<verbose>true</verbose>??

????????????????????<overwrite>true</overwrite>??

????????????????</configuration>??

????????????</plugin>??

????????</plugins>??

????</build>??

</project>??

2.在默認情況下，MBG的配置文件的名稱為generatorConfig.xml，并且與上文不同的是，這里需要指明數據庫連接器的絕對路徑。修改之后的配置文件如下：

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<?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>??

????????<classPathEntry??

????????????location="C:/Users/yyg/Desktop/DevTool/DevTool/repository/Maven/Maven3.2.2/local/repo/mysql/mysql-connector-java/5.1.26/mysql-connector-java-5.1.26.jar"?/>??

????????<context?id="sqlserverTables"?targetRuntime="MyBatis3">??

????????????<!--?生成的pojo，將implements?Serializable?-->??

????????????<plugin?type="org.mybatis.generator.plugins.SerializablePlugin"></plugin>??

????????????<commentGenerator>??

????????????????<!--?是否去除自動生成的注釋?true：是?：?false:否?-->??

????????????????<property?name="suppressAllComments"?value="true"?/>??

????????????</commentGenerator>??

??

????????????<!--?數據庫鏈接URL、用戶名、密碼?-->??

????????????<jdbcConnection?driverClass="com.mysql.jdbc.Driver"??

????????????????connectionURL="jdbc:mysql://localhost:3306/mybatis"?userId="root"?password="1234">??

????????????</jdbcConnection>??

??

????????????<!--?默認false，把JDBC?DECIMAL?和?NUMERIC?類型解析為?Integer?true，把JDBC?DECIMAL???

????????????????和?NUMERIC?類型解析為java.math.BigDecimal?-->??

????????????<javaTypeResolver>??

????????????????<property?name="forceBigDecimals"?value="false"?/>??

????????????</javaTypeResolver>??

??

????????????<!--?生成model模型，對應的包路徑，以及文件存放路徑(targetProject)，targetProject可以指定具體的路徑,如./src/main/java，???

????????????????也可以使用“MAVEN”來自動生成，這樣生成的代碼會在target/generatord-source目錄下?-->??

????????????<!--<javaModelGenerator?targetPackage="com.joey.mybaties.test.pojo"?targetProject="MAVEN">?-->??

????????????<javaModelGenerator?targetPackage="com.csdn.ingo.entity"??

????????????????targetProject="./src/main/java">??

????????????????<property?name="enableSubPackages"?value="true"?/>??

????????????????<!--?從數據庫返回的值被清理前后的空格?-->??

????????????????<property?name="trimStrings"?value="true"?/>??

????????????</javaModelGenerator>??

??

????????????<!--對應的mapper.xml文件?-->??

????????????<sqlMapGenerator?targetPackage="mappers"??

????????????????targetProject="./src/main/resources">??

????????????????<property?name="enableSubPackages"?value="true"?/>??

????????????</sqlMapGenerator>??

??

????????????<!--?對應的Mapper接口類文件?-->??

????????????<javaClientGenerator?type="XMLMAPPER"??

????????????????targetPackage="com.csdn.ingo.dao"?targetProject="./src/main/java">??

????????????????<property?name="enableSubPackages"?value="true"?/>??

????????????</javaClientGenerator>??

??

??

????????????<!--?列出要生成代碼的所有表，這里配置的是不生成Example文件?-->??

????????????<table?tableName="userinfo"?domainObjectName="UserInfoPO"??

????????????????enableCountByExample="false"?enableUpdateByExample="false"??

????????????????enableDeleteByExample="false"?enableSelectByExample="false"??

????????????????selectByExampleQueryId="false">??

????????????????<property?name="useActualColumnNames"?value="false"?/>??

????????????</table>??

????????</context>??

????</generatorConfiguration>??????

3.運行方法：在eclipse 中，選擇pom.xml文件，擊右鍵先擇Run AS——>Maven Build… ——>在Goals框中輸入：mybatis-generator:generate

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對比上面兩種方式，博主更加傾向于第一種方式，其main方法每次保持不變，xml配置文件中，也不用關心jdbc配置，每次使用時只需要修改其他關鍵配置項即可。另外，按照官方文檔，我們還能夠使用命令行，ant等方式實現上述同樣的效果。這里博主只列出這兩種方式的示例，更多內容請讀者自行實現。

最后，在給出一個小建議：在建表時，字段名稱建議用"_"分隔多個單詞，比如:AWB_NO、REC_ID...，這樣生成的entity，屬性名稱就會變成漂亮的駝峰命名，即：awbNo、recId

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至此，Mybatis最入門---代碼自動生成(GeneratorCOnfig.xml配置)結束

參考資料：

官方文檔：

http://www.jianshu.com/p/e09d2370b796

http://www.cnblogs.com/yjmyzz/p/4210554.html

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