近期因为项目需要,调研了myBatis 3.x的使用,当然,顺便也就研究了一下使用Generator来通过逆向工程生成pojo,mapper等文件。使用这个工具之前,要先下载相关的jar包,我使用的是最新的mybatis-generator-core-1.3.2.jar。
下面将generatorConfig.xml列出来:
<?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="context1" >
<jdbcConnection driverClass="com.mysql.jdbc.Driver"
connectionURL="jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf8"
userId="root"
password="" />
<javaModelGenerator targetPackage="com.lanx.test.domain" targetProject="/home/user/workspace/mybatis-web/src/main/java" />
<sqlMapGenerator targetPackage="com.lanx.test.mapper" targetProject="/home/user/workspace/mybatis-web/src/main/resources/" />
<javaClientGenerator targetPackage="com.lanx.test.mapper" type="XMLMAPPER" targetProject="/home/user/workspace/mybatis-web/src/main/java" />
<table domainObjectName="Person" tableName="PERSON" enableCountByExample="false"
enableDeleteByExample="false" enableSelectByExample="false" enableUpdateByExample="false" >
<property name="modelOnly" value="false"/>
</table>
</context>
</generatorConfiguration>
我将这个xml文件放置在了项目根目录下,接下来参考的是一个类似官方的文档:
http://generator.sturgeon.mopaas.com/running/runningFromCmdLine.html
从命令行运行 MyBatis Generator
按照文档中所说,执行:
java -jar /home/user/backup/mybatis-generator-core-1.3.2.jar -configfile generatorConfig.xml
出现下列错误:
Exception in thread "main" java.lang.RuntimeException: Exception getting JDBC Driver
at org.mybatis.generator.internal.db.ConnectionFactory.getDriver(ConnectionFactory.java:85)
at org.mybatis.generator.internal.db.ConnectionFactory.getConnection(ConnectionFactory.java:54)
at org.mybatis.generator.config.Context.getConnection(Context.java:526)
at org.mybatis.generator.config.Context.introspectTables(Context.java:436)
at org.mybatis.generator.api.MyBatisGenerator.generate(MyBatisGenerator.java:222)
at org.mybatis.generator.api.ShellRunner.main(ShellRunner.java:117)
Caused by: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:344)
at org.mybatis.generator.internal.ObjectFactory.internalClassForName(ObjectFactory.java:150)
at org.mybatis.generator.internal.ObjectFactory.externalClassForName(ObjectFactory.java:121)
at org.mybatis.generator.internal.db.ConnectionFactory.getDriver(ConnectionFactory.java:82)
... 5 more
其实在运行前就已经估计到了,显然并没有引入mysql的驱动程序jar包,修改后的语句如下:
java -cp /home/user/backup/mybatis-generator-core-1.3.2.jar:/home/user/backup/mysql-connector-java-5.1.36.jar org.mybatis.generator.api.ShellRunner -configfile generatorConfig.xml
运行后,顺利生成了pojo等文件,要注意generatorConfig.xml文件中javaModelGenerator等几个节点targetProject属性的配置,在这里我都写了绝对路径。实际上,如果此配置出错,书写了不存在的文件夹,会出现警告提示。
而使用java程序运行MyBatis Generator 1.3.x,直接copy此网站上给出的代码即可。
参考url如下:http://generator.sturgeon.mopaas.com/running/runningWithJava.html
最后,我的开发环境:ubuntu kylin + eclipse-Luna-SR2 + jdk8