mybatis代码生成工具mybatis-generator调用有好几种方式

摘要: mybatis代码生成工具mybatis-generator调用有好几种方式

mybatis代码生成工具mybatis-generator调用有好几种方式：

1. 使用eclipse插件，在下面地址安装
http://mybatis.googlecode.com/svn/sub-projects/generator/trunk/eclipse/UpdateSite/
然后编写生成配置文件generatorConfig.xml，eclipse中在这个文件上右键，就有Generate Mybatis/iBatis Artifacts，由此就可以生成代码了。generatorConfig.xml文件详细内容之后有示例，这里先不贴出来，使用eclipse插件的方式有个不同就是targetProject的配置是项目名开头的，比如其他配置是targetProject="src/main/java"，在这里就要是targetProject="项目名/src/main/java"。这里为什么要加上项目名，可能是因为eclipse插件是针对ide的，需要指定ide内是哪个项目。

2. maven

使用mybatis-generator的maven插件，在这里http://mybatis.org/generator/running/runningWithMaven.html有说明。先添加依赖

<dependency>

<groupId>mysql</groupId>

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

<version>5.1.24</version>

</dependency>

<dependency>

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

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

<version>1.3.2</version>

</dependency>

<dependency>

<groupId>org.mybatis</groupId>

<artifactId>mybatis</artifactId>

<version>3.2.3</version>

</dependency>

在plugins里面添加

<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>5.1.24</version>

</dependency>

</dependencies>

<configuration>

<configurationFile>${basedir}/src/main/resources/config/generatorConfig.xml</configurationFile>

<overwrite>true</overwrite>

</configuration>

<executions>

<execution>

<id>Generate MyBatis Artifacts</id>

<goals>

<goal>generate</goal>

</goals>

<!--<configuration>

<configurationFile>${basedir}/src/main/resources/generatorConfig.xml</configurationFile>

<overwrite>true</overwrite>

<jdbcDriver>com.mysql.jdbc.Driver</jdbcDriver>

<jdbcURL>jdbc:mysql://localhost:3306/test</jdbcURL>

<jdbcUserId>test</jdbcUserId>

<jdbcPassword>test</jdbcPassword>

</configuration>-->

</execution>

</executions>

</plugin>

里面注意在execution里面的configuration配置是注释掉的，网上好多例子都是这样写的，但我测试时写在这里是不生效的，而直接放在plugin内是可以的。

generatorConfig.xml的例子如下：

<?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="mysqlTables" targetRuntime="MyBatis3">

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

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

<commentGenerator>

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

<property name="suppressDate" value="true" />

</commentGenerator>

<jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3306/test" userId="test" password="test"/>

<javaTypeResolver>

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

</javaTypeResolver>

<javaModelGenerator targetPackage="com.xxx.mybatis.entity" targetProject="src/main/java">

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

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

</javaModelGenerator>

<sqlMapGenerator targetPackage="mapper.com.xxx.mybatis" targetProject="src/main/resources">

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

</sqlMapGenerator>

<javaClientGenerator targetPackage="com.xxx.mybatis.dao" targetProject="src/main/java" type="XMLMAPPER">

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

</javaClientGenerator>

<table tableName="users">

<columnOverride column="userid" javaType="java.lang.Long"/>

</table>

</context>

</generatorConfiguration>

然后使用mvn mybatis-generator:generate运行成功执行。或者可以指定参数运行mvn -Dmybatis.generator.overwrite=true mybatis-generator:generate。

详细参数见官方文档Parameter Reference那段。

3. 直接运行jar

为了简单起见，我把jar文件跟生成配置文件拷贝到一起mybatis-generator-core-1.3.2.jar和generatorConfig.xml，这里的xml文件要加上jdbs驱动的路径，在<generatorConfiguration>内部加上

<classPathEntry location="C:\Users\Administrator\.m2\repository\mysql\mysql-connector-java\5.1.24\mysql-connector-java-5.1.24.jar"/>

java -jar mybatis-generator-core-1.3.2.jar -configfile generatorConfig.xml -overwrite

这样也可正常生成。

这里有段使用生成代码的小例子，需要mybatis的配置文件MapperConfig.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE configuration

PUBLIC "-//mybatis.org//DTD Config 3.0//EN"

"http://mybatis.org/dtd/mybatis-3-config.dtd">

<configuration>

<environments default="development">

<environment id="development">

<transactionManager type="JDBC"/>

<dataSource type="POOLED">

<property name="driver" value="com.mysql.jdbc.Driver" />

<property name="url" value="jdbc:mysql://localhost/test" />

<property name="username" value="test" />

<property name="password" value="test" />

</dataSource>

</environment>

</environments>

<mappers>

<mapper resource="mapper/com/xxx/mybatis/UsersMapper.xml"/>

</mappers>

</configuration>

这里的mapper内的属性，netbeans会自动提示resources，应该是resource。坑爹的是，这里写s结尾的，报错却说mapper应该配置属性resources，然后删除s配置resource才不会报错。在下载的mybatis-generator-config_1_0.dtd文件可以看到正确的定义。然后java调用：

Reader reader = Resources.getResourceAsReader("config/MapperConfig.xml");

SqlSessionFactory sqlMapper = new SqlSessionFactoryBuilder().build(reader);

SqlSession sqlSession = sqlMapper.openSession();

UsersExample example = new UsersExample();

example.createCriteria().andPasswordIsNotNull();

try {

UsersMapper mapper = sqlSession.getMapper(UsersMapper.class);

List<Users> users = mapper.selectByExample(example);

for (Users u : users)

System.out.println(u.getUsername() + " -- " + u.getPassword());

} finally {

sqlSession.close();

}

4. 自行编写代码

官方有说明http://mybatis.org/generator/running/runningWithJava.html

直接上代码

...

import org.mybatis.generator.api.MyBatisGenerator;

import org.mybatis.generator.config.Configuration;

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

import org.mybatis.generator.internal.DefaultShellCallback;

...

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

final boolean overwrite = true;

File configFile = new File("src/main/resources/config/generatorConfig.xml");

//System.out.println("config fiel is in : " + configFile.getAbsoluteFile());

ConfigurationParser cp = new ConfigurationParser(warnings);

Configuration configuration = cp.parseConfiguration(configFile);

DefaultShellCallback callback = new DefaultShellCallback(overwrite);

MyBatisGenerator mybatisGenerator = new MyBatisGenerator(configuration, callback, warnings);

mybatisGenerator.generate(null);

spring集成mybatis等，以后再补充吧：

http://www.cnblogs.com/huanmieuroshui/archive/2012/12/18/2822754.html

http://www.cnblogs.com/zemliu/archive/2013/08/07/3242966.html