1.mybatis generator代码生成配置

1.pom中添加基础配置依赖

   <!-- https://mvnrepository.com/artifact/org.mybatis.spring.boot/mybatis-spring-boot-starter -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.2.0</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.4.0</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-maven-plugin</artifactId>
            <version>1.4.0</version>
        </dependency>

2.pom中添加generator插件
注意：此插件位置和pluginManagement标签平级

     <build>
        <pluginManagement>
            <plugins>
              
            </plugins>
        </pluginManagement>
        <plugins>
            <!--mybatis.generator插件-->
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.4.0</version>
                <configuration>
                    <!--generatorConfig配置文件的位置-->
                    <configurationFile>src/main/resources/mybatis/generatorConfig.xml</configurationFile>
                    <verbose>true</verbose>
                    <overwrite>true</overwrite>
                </configuration>
                <dependencies>
                    <dependency>
                        <groupId>org.mybatis.generator</groupId>
                        <artifactId>mybatis-generator-core</artifactId>
                        <version>1.4.0</version>
                    </dependency>
                    <!--mysql驱动包-->
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>8.0.19</version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
    </build>

3.在resources/mybatis目录下添加generatorConfig.xml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="mysqlTables" targetRuntime="MyBatis3">

        <!-- 生成的Java文件的编码 -->
        <property name="javaFileEncoding" value="UTF-8" />
        <!-- 格式化java代码 -->
        <property name="javaFormatter" value="org.mybatis.generator.api.dom.DefaultJavaFormatter" />
        <!-- 格式化 XML 代码 -->
        <property name="xmlFormatter" value="org.mybatis.generator.api.dom.DefaultXmlFormatter"/>
        <!-- JavaBean 实现 序列化 接口 -->
        <plugin type="org.mybatis.generator.plugins.SerializablePlugin"/>
        <!-- genenat entity时,生成toString -->
        <plugin type="org.mybatis.generator.plugins.ToStringPlugin" />

        <commentGenerator >
            <property name="suppressAllComments" value="true"/>
            <!--生成的注释包含时间戳-->
            <property name="suppressDate" value="true"/>
        </commentGenerator>
        <!-- 数据库链接URL，用户名、密码 -->
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/cloud2020?useUnicode=true&amp;useJDBCCompliantTimezoneShift=true&amp;useLegacyDatetimeCode=false&amp;serverTimezone=UTC"
                        userId="root"
                        password="password">
            <!--解决mysql驱动升级到8.0后不生成指定数据库代码的问题-->
            <property name="nullCatalogMeansCurrent" value="true" />
        </jdbcConnection>

        <javaTypeResolver>
            <property name="forceBigDecimals" value="false" />
        </javaTypeResolver>

        <!-- 生成模型的包名和位置   映射实体类的位置 -->
        <javaModelGenerator targetPackage="com.xxx.cloud.user.entity"
                            targetProject="src/main/java">
            <property name="enableSubPackages" value="true" />
            <property name="trimStrings" value="true" />
        </javaModelGenerator>
        <!-- 生成映射文件的包名和位置  mapper.xml -->
        <sqlMapGenerator targetPackage="mybatis.mapper"
                         targetProject="src/main/resources">
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>
        <!-- 生成DAO的包名和位置   mapper接口-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.xxx.cloud.user.mapper"
                             targetProject="src/main/java">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>

        <!-- 要生成哪些表  user是我的表名，User是生成的类名，比如我的映射类为User，映射接口UserMapper, 映射文件为UserMapper.xml，可以添加多个表，里面的几个配置大概意思就是是否允许生成example文件和支持selectByExample。用过Mybatis的应该知道selectByExample，对于一些简单查询用这个还是比较方便的。哈哈、话有点多，记得删除 -->
        <table schema="cloud2020" tableName="user" domainObjectName="User"
               enableDeleteByPrimaryKey="true"
               enableSelectByPrimaryKey="true"
               enableUpdateByPrimaryKey="true"
               enableCountByExample="false" enableSelectByExample="false"
               enableUpdateByExample="false" enableDeleteByExample="false"/>
        <!-- 要生成哪些表  -->
        <table schema="cloud2020" tableName="test_db" domainObjectName="Db"
               enableDeleteByPrimaryKey="true"
               enableSelectByPrimaryKey="true"
               enableUpdateByPrimaryKey="true"
               enableCountByExample="false" enableSelectByExample="false"
               enableUpdateByExample="false" enableDeleteByExample="false"/>
    </context>

</generatorConfiguration>