mybatis-generator 在Spring Boot 中的集成

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使用 mybatis-generator 生成 Mybatis 代码
配置方法及踩坑过程
mysql 8.0

配置方法

pom.xml

<?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>2.3.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.hsmus</groupId>
    <artifactId>mybatis_generator_demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>mybatis_generator_demo</name>
    <description>Demo project for Spring Boot</description>
    <packaging>jar</packaging>
    <properties>
        <java.version>11</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.3</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.11</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </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>
            <!-- mybatis代码生成插件 -->
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.2</version>
                <configuration>
                    <!--配置文件的位置-->
                    <configurationFile>src/main/resources/generatorConfig.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>

application.properties

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql:///study_01?useSSL=false
spring.datasource.username=root
spring.datasource.password=123456

mybatis.type-aliases-package=com.hsmus.mybatis_generator_demo.mapper
mybatis.mapper-locations=classpath:mapper/*.xml

generatorConfig.xml内容

<?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>
    <!--mysql 连接数据库jar 这里选择自己本地位置;
    如果不知道maven本地仓库地址,可以使用EveryThing工具全局搜索mysql-connector-java,找到jar包位置;
    也可以手动下载一个jar放在指定位置,进行引用。
    -->
    <classPathEntry location="/Users/zhang/Codes/java/tools/maven_repos/mysql/mysql-connector-java/8.0.11/mysql-connector-java-8.0.11.jar"/>

    <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 -->
        <!-- connectionURL里面的 nullCatalogMeansCurrent=true 参数非常重要,不配置可能会导致出现重复代码,导致报错
            详见:https://blog.csdn.net/zyt19870409/article/details/96989749
         -->
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"

                        connectionURL="jdbc:mysql://localhost:3306/study_01?serverTimezone=GMT%2B8&amp;useSSL=false&amp;nullCatalogMeansCurrent=true"
                        userId="root"
                        password="123456">
        </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>

        <!-- 指定javaBean生成的位置
            targetPackage:生成的类要放的包,真实的包受enableSubPackages属性控制;
            targetProject:目标项目,指定一个存在的目录下,生成的内容会放到指定目录中,如果目录不存在,MBG不会自动建目录
         -->
        <javaModelGenerator targetPackage="com.hsmus.mybatis_generator_demo.pojo" targetProject="src/main/java">
            <!-- 在targetPackage的基础上,根据数据库的schema再生成一层package,最终生成的类放在这个package下,默认为false;如果多个数据库改为true分目录 -->
            <property name="enableSubPackages" value="false"/>
            <!-- 设置是否在getter方法中,对String类型字段调用trim()方法 -->
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>

        <!--  指定mapper映射文件生成的位置
           targetPackage、targetProject同javaModelGenerator中作用一样-->
        <sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources">
            <property name="enableSubPackages" value="false"/>
        </sqlMapGenerator>

        <!-- 指定mapper接口生成的位置
         targetPackage、targetProject同javaModelGenerator中作用一样
         -->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.hsmus.mybatis_generator_demo.mapper" targetProject="src/main/java">
            <property name="enableSubPackages" value="false"/>
        </javaClientGenerator>

        <!-- 指定数据库表
        domainObjectName:生成的domain类的名字,当表名和domain类的名字有差异时一定要设置,如果不设置,直接使用表名作为domain类的名字;
        可以设置为somepck.domainName,那么会自动把domainName类再放到somepck包里面;
        -->
        <table schema="" tableName="job"></table>
        <table schema="" tableName="account"></table>
        <table schema="" tableName="users"></table>
    </context>
</generatorConfiguration>

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