实现功能：根据数据库中的表，自动生成model、dao和对应的xml文件。xml中实现通用mapper中CURD功能

1、引入依赖

<properties> <mybatis.generator.version>1.3.7</mybatis.generator.version> <tk.mybatis.version>4.1.5</tk.mybatis.version> </properties> <dependencies> <!--mybatis--> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>2.1.3</version> </dependency> <!--通用mapper--> <dependency> <groupId>tk.mybatis</groupId> <artifactId>mapper</artifactId> <version>${tk.mybatis.version}</version> </dependency> <!--mybatis-generator--> <dependency> <groupId>org.mybatis.generator</groupId> <artifactId>mybatis-generator-core</artifactId> <version>${mybatis.generator.version}</version> </dependency> <!--mysql数据库--> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> <!--druid数据源--> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>1.1.10</version> </dependency> <dependencies> <build> <plugins> <!--配置Maven中 mybatis-generator 插件--> <!--加入tk.mybatis的依赖--> <plugin> <groupId>org.mybatis.generator</groupId> <artifactId>mybatis-generator-maven-plugin</artifactId> <version>${mybatis.generator.version}</version> <configuration> <!--可移动--> <verbose>true</verbose> <!--可覆盖--> <overwrite>true</overwrite> </configuration> <dependencies> <dependency> <groupId>tk.mybatis</groupId> <artifactId>mapper</artifactId> <version>${tk.mybatis.version}</version> </dependency> </dependencies> </plugin> </plugins> </build>

2、配置通用mapper

方式1：配置要扫描的mapper

@SpringBootApplication@MapperScan(basePackages = "com.liang.mapper")public class MyappApplication { public static void main(String[] args) { SpringApplication.run(MyappApplication.class, args); }}

方式2：扫描的mapper

@Configurationpublic class MybatisConfig { @Bean(name = "mapperScannerConfigurer") public MapperScannerConfigurer MapperScannerConfigurer1() { MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer(); mapperScannerConfigurer.setBasePackage("com.liang.mapper"); Properties properties = new Properties(); properties.setProperty("notEmpty", "false"); properties.setProperty("IDENTITY", "MYSQL"); properties.setProperty("mappers", Mapper.class.getName()); mapperScannerConfigurer.setSqlSessionFactoryBeanName("sqlSessionFactory"); mapperScannerConfigurer.setProperties(properties); return mapperScannerConfigurer; }}

3、application.yaml中配置mybatis

#Mybatis（注意不是 mybatis.config-location 这个配置）mybatis: mapper-locations: classpath:mapper/*.xml type-aliases-package: com.liang.pojo configuration-properties: { notEmpty: false, IDENTITY: 'MYSQL', mappers: "tk.mybatis.mapper.common.Mapper" }

4、添加generatorConfig.xml

<?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> <!-- 数据库驱动--> <classPathEntry location="E:\ideaMaven\MavenRepository\mysql\mysql-connector-java\8.0.22\mysql-connector-java-8.0.22.jar" /> <context id="DB2Tables" targetRuntime="MyBatis3Simple"> <!--beginningDelimiter和endingDelimiter：指明数据库的用于标记数据库对象名的符号，比如ORACLE就是双引号，MYSQL默认是`反引号； --> <property name="beginningDelimiter" value="`"></property> <property name="endingDelimiter" value="`"></property> <!-- 生成的Java文件的编码 --> <property name="javaFileEncoding" value="utf-8"/> <!--添加Tk-mapper插件--> <plugin type="tk.mybatis.mapper.generator.MapperPlugin" > <property name="mappers" value="tk.mybatis.mapper.common.Mapper"/> </plugin> <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3306/temp_db?serverTimezone=Asia/Shanghai&amp;characterEncoding=utf-8&amp;useUnicode=true&amp;useSSL=false" userId="root" password="123456"> </jdbcConnection> <!-- java类型处理器 用于处理DB中的类型到Java中的类型，默认使用JavaTypeResolverDefaultImpl； 注意一点，默认会先尝试使用Integer，Long，Short等来对应DECIMAL和 NUMERIC数据类型； --> <javaTypeResolver > <property name="forceBigDecimals" value="false" /> </javaTypeResolver> <!--生成entity类存放位置--> <javaModelGenerator targetPackage="com.liang.pojo" targetProject="src/main/java"> <property name="enableSubPackages" value="false" /> <property name="trimStrings" value="true" /> </javaModelGenerator> <!--生成映射文件存放位置 --> <sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources"> <property name="enableSubPackages" value="true" /> </sqlMapGenerator> <!--生成Dao类存放位置--> <javaClientGenerator type="XMLMAPPER" targetPackage="com.liang.mapper" targetProject="src/main/java"> <property name="enableSubPackages" value="true" /> </javaClientGenerator> <!--要生成的Table,注意不同的数据库，sqlStatement--> <!--sqlStatement 不同的数据库配置 http://mybatis.org/generator/configreference/generatedKey.html--> <table domainObjectName="School2" tableName="t_school"> <!--<generatedKey column="id" sqlStatement="MySql" identity="true" />--> <generatedKey column="id" sqlStatement="SELECT LAST_INSERT_ID() AS id" identity="true" /> </table> </context></generatorConfiguration>

5、完成

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