MyBatis逆向工程 MyBatis逆向工程基本操作及代码实例
viewts 人气:0回想一下MyBatis的基本操作,它需要实体类,自定义mapper接口以及mapper.xml配置文件。为了避免繁琐的工作量,MyBatis Generator,简称MBG,可自动生成框架所需的这些依赖,同时支持基本的CRUD操作,但是需要注意,MBG一般不要重复执行,否则会出问题。
下面是引入MBG的基本操作:
一、新建maven项目,引入依赖:
<dependencies> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.5.5</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.20</version> </dependency> <dependency> <groupId>org.mybatis.generator</groupId> <artifactId>mybatis-generator-core</artifactId> <version>1.4.0</version> </dependency> </dependencies>
二、创建mbg配置文件:
<?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="testMBG" targetRuntime="MyBatis3"> <!-- 连接池 --> <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3306/demo" userId="root" password="" ></jdbcConnection> <!-- 配置JavaBean生成策略 --> <javaModelGenerator targetPackage="com.wts.entity" targetProject="./src/main/java"></javaModelGenerator> <!-- 配置SQL映射文件生成策略 --> <sqlMapGenerator targetPackage="com.wts.entity" targetProject="./src/main/java"></sqlMapGenerator> <!-- 配置Mapper接口的生成策略 --> <javaClientGenerator targetPackage="com.wts.entity" targetProject="./src/main/java"></javaClientGenerator> <table tableName="user" domainObjectName="User"></table> </context> </generatorConfiguration>
三、运行Generator:
public class MyTest { public static void main(String[] args) { List<String> warnings = new ArrayList<>(); File configFile = new File(MyTest.class.getResource("generatorConfig.xml").getFile()); ConfigurationParser configurationParser = new ConfigurationParser(warnings); Configuration configuration = null; try { configuration = configurationParser.parseConfiguration(configFile); } catch (IOException e) { e.printStackTrace(); } catch (XMLParserException e) { e.printStackTrace(); } DefaultShellCallback callback = new DefaultShellCallback(true); MyBatisGenerator myBatisGenerator = null; try { myBatisGenerator = new MyBatisGenerator(configuration, 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(); } } }
这都是固定写法,了解一下即可。
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