集成Mybatis Generator dao层代码生成

Mybatis Generator dao层代码生成

介绍

我们在使用mybatis开发的时候，需要去写表的基本的crud，这些咱们通常定义到dao层里面去，而mybatis generator可以帮我们把这件事情自动完成，大大节省时间并且可以规范dao层的代码。

springboot 集成

引入pom

主要是build部分

<?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>2.6.7</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.hh</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>demo</description>
    <properties>
        <java.version>8</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>2.2.2</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.21</version>
        </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>
        </dependency>
    </dependencies>

    <build>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <filtering>true</filtering>
            </resource>
        </resources>
        <plugins>
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.4.2</version>
                <configuration>
                    <verbose>true</verbose>
                    <overwrite>true</overwrite>
                </configuration>
                <dependencies>
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>8.0.21</version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
    </build>

</project>

配置文件

默认名称是generatorConfig.xml

<!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="simple" targetRuntime="MyBatis3">
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                        connectionURL="jdbc:mysql://127.0.0.1:3306/ry?serverTimezone=CTT&amp;useUnicode=true&amp;characterEncoding=utf-8"
                        userId="root" password="root"/>

        <javaModelGenerator targetPackage="com.hh.dao.model" targetProject="src/main/java"/>

        <sqlMapGenerator targetPackage="hh.mapper" targetProject="src/main/resources"/>

        <javaClientGenerator type="XMLMAPPER" targetPackage="com.hh.dao.mapper" targetProject="src/main/java">
            <property name="enableSubPackages" value="false"/>
            <property name="trimStrings" value="true"/>
            <property name="mapUnderscoreToCamelCase" value="true"/>
        </javaClientGenerator>

        <table tableName="base_user"/>
    </context>
</generatorConfiguration>

生成代码

创建表

CREATE TABLE `base_user` (
  `user_id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '用户ID',
  `tenant_id` int(11) DEFAULT NULL COMMENT '租户id',
  `user_name` varchar(30) DEFAULT '' COMMENT '用户昵称',
  `remark` varchar(500) DEFAULT NULL COMMENT '备注',
  PRIMARY KEY (`user_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='用户信息表';

在项目的maven中双击生成代码插件

生成的类

完成。