需要用到两个mybatis的generator和mysql驱动两个jar包,将这两个jar包添加为依赖。(例:mybatis-generator-core-1.3.5.jar,mysql-connector-java-5.1.45-bin.jar)
配置generatorConfig.xml文件:
<?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="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://localhost:3306/elec" userId="root" password="2018"> </jdbcConnection> <!--下为oracle数据库--> <!-- <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.itszt.domain" 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.itszt.mapper"--> <!--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.itszt.mapper" 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="%"></table> <!--<table tableName="t_order"></table>--> <!--<table tableName="goods"></table>--> </context> </generatorConfiguration>
核心操作类:
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; import java.io.File; import java.util.ArrayList; import java.util.List; /** * 工具类,将数据库中的表批量映射为对象 */ public class Test { public static void main(String[] args) throws Exception{ try { List<String> warnings = new ArrayList<String>(); boolean overwrite = true; File configFile = new File("generatorConfig.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); System.out.println("映射成功"); } catch (Exception e) { System.out.println("映射失败"); e.printStackTrace(); } } }