mybatis逆向工程

使用mybatis的逆向工程生成JavaBean和mapper以及映射文件只需要三个步骤：

1.逆向工程maven依赖

2.编写配置文件genarator.xml

3.编写主函数（启动类）

一.maven依赖

<dependencies>
<!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.34</version>
</dependency>
<!-- https://mvnrepository.com/artifact/log4j/log4j -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.mybatis.generator/mybatis-generator-core -->
<dependency>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-core</artifactId>
<version>1.3.5</version>
</dependency>

</dependencies>

maven依赖对应的jar包如图所示

二.配置文件genarator.xml

<generatorConfiguration>

<context id="testTables" targetRuntime="MyBatis3">
<commentGenerator>
<!-- 是否去除自动生成的注释 true：是 ： false:否 -->
<property name="suppressAllComments" value="true" />
</commentGenerator>
<!--数据库连接的信息：驱动类、连接地址、用户名、密码 -->
<jdbcConnection driverClass="com.mysql.jdbc.Driver"
connectionURL="jdbc:mysql://?characterEncoding=UTF-8" userId="root"
password="qiandu">

<!-- <jdbcConnection driverClass="oracle.jdbc.OracleDriver"
connectionURL="jdbc:oracle:thin:@127.0.0.1:1521:yycg"
userId="yycg"
password="yycg">
</jdbcConnection> -->

<!-- 默认false，把JDBC DECIMAL 和 NUMERIC 类型解析为 Integer，为 true时把JDBC DECIMAL 和
NUMERIC 类型解析为java.math.BigDecimal -->
<javaTypeResolver>
<property name="forceBigDecimals" value="false" />
</javaTypeResolver>

<!-- targetProject:生成PO类的位置 -->
<javaModelGenerator targetPackage="com.jointem.hrm.entity"
targetProject=".\src">
<!-- enableSubPackages:是否让schema作为包的后缀 -->
<property name="enableSubPackages" value="false" />
<!-- 从数据库返回的值被清理前后的空格 -->
<property name="trimStrings" value="true" />
</javaModelGenerator>

<!-- targetProject:mapper映射文件生成的位置 -->
<sqlMapGenerator targetPackage="com.jointem.hrm.dao"
targetProject=".\src">
<!-- enableSubPackages:是否让schema作为包的后缀 -->
<property name="enableSubPackages" value="false" />
</sqlMapGenerator>

<!-- targetPackage：mapper接口生成的位置 -->
<javaClientGenerator type="XMLMAPPER"
targetPackage="com.jointem.hrm.dao"
targetProject=".\src">
<!-- enableSubPackages:是否让schema作为包的后缀 -->
<property name="enableSubPackages" value="false" />
</javaClientGenerator>

<!-- 指定数据库表 -->
<!-- <table tableName="items"></table> -->
<table tableName="users"></table>
<table tableName="roles"></table>
<table tableName="permissions"></table>
<table tableName="users_roles"></table>
<table tableName="roles_permissions"></table>

<!-- 有些表的字段需要指定java类型
<table schema="" tableName="">
<columnOverride column="" javaType="" />
</table> -->
</context>

</generatorConfiguration>

三.主函数（启动类）

public class StartServer{

public void generator() throws Exception{
List<String> warnings = new ArrayList<String>();
boolean overwrite = true;
File configFile = new File("genarator.xml");
ConfigurationParser cp = new ConfigurationParser(warnings);
Configuration config = cp.parseConfiguration(configFile);
DefaultShellCallback callback = new DefaultShellCallback(overwrite);
MyBatisGenerator myBatisGenerator = new MyBatisGenerator(config,
callback, warnings);
myBatisGenerator.generate(null);
}

public static void main(String[] args) throws Exception {
try {
StartServer startServer = new StartServer();
startServer.generator();
} catch (Exception e) {
e.printStackTrace();
}
}

}

总结

通过上述步骤，运行编写的启动类（此处为StartServer.java）即可完成mabatis相对于数据库的逆向工程，生成entity、mapper以及映射文件

如图所示



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