mybatis-generator

Mybatis是目前主流的ORM框架，相比于hibernate的全自动，它是半自动化需要手写sql语句、接口、实体对象，后来推出的Generator自动生成代码,可以通过配置，快速生成mapper和xml文件。

pom文件中添加依赖

<?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>2.1.10.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.wh</groupId>
    <artifactId>sbm-generator</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>sbm-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-thymeleaf</artifactId>
        </dependency>
        <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>1.3.2</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.38</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.2.5</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.6</version>
                <configuration>
                    <!--配置文件的位置-->
                    <configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile>
                    <verbose>true</verbose>
                    <overwrite>true</overwrite>
                </configuration>
                <dependencies>
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>5.1.38</version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
    </build>
</project>

resource目录下创建generatorConfig.xml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>
    <classPathEntry location="E:\maven\MavenRespotion\mysql\mysql-connector-java\5.1.38"></classPathEntry>
    <context id="context" targetRuntime="Mybatis3">
	<commentGenerator>
            <property name="suppressAllComments" value="true"/>
            <property name="suppressDate" value="true"/>
        </commentGenerator>

        <!-- 数据库的相关配置 -->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3306/my_site?serverTimezone=UTC"
                        userId="root" password="wh123456"/>

        <!-- 非必需，类型处理器，在数据库类型和java类型之间的转换控制-->
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>

        <!-- Model实体类生成的位置 -->
        <javaModelGenerator targetPackage="com.wh.pojo" targetProject="src/main/java">
            <!-- 是否对model添加 构造函数 -->
            <property name="constructorBased" value="false"/>
            <!-- 是否允许子包，即targetPackage.schemaName.tableName -->
            <property name="enableSubPackages" value="true"/>
            <!-- 建立的Model对象是否 不可改变  即生成的Model对象不会有 setter方法，只有构造方法 -->
            <property name="immutable" value="false"/>
            <!-- 给Model添加一个父类 -->
            <!--<property name="rootClass" value="com.foo.louis.Hello"/>-->
            <!-- 是否对类CHAR类型的列的数据进行trim操作 -->
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>

        <!-- *Mapper.xml 文件的位置 -->
        <sqlMapGenerator targetPackage="mapper" targetProject="src/main/resources">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>

        <!-- Mapper 接口文件的位置 -->
        <javaClientGenerator targetPackage="com.wh.mapper" targetProject="src/main/java"
                             type="XMLMAPPER">
            <property name="enableSubPackages" value="true"/>
            <!--
                    定义Maper.java 源代码中的ByExample() 方法的可视性，可选的值有：
                    public;
                    private;
                    protected;
                    default
                    注意：如果 targetRuntime="MyBatis3",此参数被忽略
             -->
            <property name="exampleMethodVisibility" value=""/>
            <!--方法名计数器Important note: this property is ignored if the target runtime is MyBatis3.-->
            <property name="methodNameCalculator" value=""/>
            <!--为生成的接口添加父接口-->
            <property name="rootInterface" value=""/>
        </javaClientGenerator>

        <!-- 相关表的配置 -->
        <table tableName="person" enableCountByExample="false" enableDeleteByExample="false"
               enableSelectByExample="false"
               enableUpdateByExample="false"/>
    </context>

</generatorConfiguration>

application.yml配置

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/my_site?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&useSSL=false
    username: root
    password: wh123456
    driver-class-name: com.mysql.jdbc.Driver
mybatis:
  mapper-locations: classpath:mapper/*.xml