需求：

        使用的gauss db数据库（类似oracle语法），需要根据指定表生成entity、dao等代码

1，引入依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.2.1.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.example</groupId><artifactId>spring-boot-mybatis-generator</artifactId><version>0.0.1-SNAPSHOT</version><name>spring-boot-mybatis-generator</name><description>Demo project for Spring Boot</description><properties><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!-- MySQL 连接驱动依赖 --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.39</version></dependency><!-- mybatis-starter  --><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>2.1.1</version></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope><exclusions><exclusion><groupId>org.junit.vintage</groupId><artifactId>junit-vintage-engine</artifactId></exclusion></exclusions></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin><!-- 引入mybatis-generator 插件 --><plugin><groupId>org.mybatis.generator</groupId><artifactId>mybatis-generator-maven-plugin</artifactId><version>1.3.2</version><configuration><!-- mybatis-generator的配置文件，根据情况调整位置 --><configurationFile>src/main/resources/mybatis-generator.xml</configurationFile><verbose>true</verbose><overwrite>true</overwrite></configuration><executions><execution><id>Generate MyBatis Artifacts</id><goals><goal>generate</goal></goals></execution></executions><dependencies><dependency><groupId>org.mybatis.generator</groupId><artifactId>mybatis-generator-core</artifactId><version>1.3.2</version></dependency></dependencies></plugin></plugins></build></project>

2，在resources目录下 mybatis-plus 的配置文件 mybatis-generator.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfigurationPUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN""http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration><!--JDBC驱动jar包的 绝对路径，填写自己的 --><classPathEntry location="D:\software\mvn-Repository\com\huawei\gauss\com.huawei.gauss.jdbc.ZenithDriver\1.5.1\com.huawei.gauss.jdbc.ZenithDriver-1.5.1.jar"/><!--defaultModelType="flat" 大数据字段，不分表 --><context id="Gauss" targetRuntime="MyBatis3Simple" defaultModelType="flat"><property name="autoDelimitKeywords" value="true" /><property name="beginningDelimiter" value="`" /><property name="endingDelimiter" value="`" /><property name="javaFileEncoding" value="utf-8" /><plugin type="org.mybatis.generator.plugins.SerializablePlugin" /><plugin type="org.mybatis.generator.plugins.ToStringPlugin" /><!-- 注释 --><commentGenerator ><property name="suppressAllComments" value="true"/><!-- 是否取消注释 --><property name="suppressDate" value="true" /> <!-- 是否生成注释代时间戳--></commentGenerator><!--数据库链接地址账号密码--><jdbcConnection driverClass="com.huawei.gauss.jdbc.inner.GaussDriver"connectionURL="jdbc:zenith:@xxxx:xxx"userId="xxxx"password="xxxx"></jdbcConnection><!-- 类型转换 --><javaTypeResolver><!-- 是否使用bigDecimal， false可自动转化以下类型（Long, Integer, Short, etc.） --><property name="forceBigDecimals" value="false"/></javaTypeResolver><!--生成Model类存放位置--><javaModelGenerator targetPackage="com.example.springbootmybatis.generator.entity" targetProject="src/main/java"><property name="enableSubPackages" value="true"/><property name="trimStrings" value="true"/></javaModelGenerator><!-- 生成mapxml文件 --><sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources" ><property name="enableSubPackages" value="false" /></sqlMapGenerator><!-- 生成mapxml对应client，也就是接口dao --><javaClientGenerator targetPackage="com.example.springbootmybatis.generator.dao" targetProject="src/main/java" type="XMLMAPPER" ><property name="enableSubPackages" value="false" /></javaClientGenerator><!--        <table tableName="user" enableCountByExample="true" enableUpdateByExample="true" enableDeleteByExample="true" enableSelectByExample="true" selectByExampleQueryId="true">-->
<!--            <generatedKey column="id" sqlStatement="Mysql" identity="true" />-->
<!--        </table>--><!--        <table tableName="user_role" enableCountByExample="true" enableUpdateByExample="true" enableDeleteByExample="true" enableSelectByExample="true" selectByExampleQueryId="true">-->
<!--            <generatedKey column="id" sqlStatement="Mysql" identity="true" />-->
<!--        </table>--><table tableName="t_comm_tag_config" enableCountByExample="true" enableUpdateByExample="true" enableDeleteByExample="true" enableSelectByExample="true" selectByExampleQueryId="true"><generatedKey column="id" sqlStatement="Gauss" identity="true" /></table></context>
</generatorConfiguration>

3，在idea 右上角 plugins-> mybatis-generator-> mybatis-generator:generator 双击执行，即可在指定配置中生成代码