002 spring boot框架，引入mybatis-generator插件，自动生成Mapper和Entity

1.创建一个springboot项目

2.创建项目的文件结构以及jdk的版本

3.选择项目所需要的依赖

点击next,直到项目构建完成。

4.项目初步结构

5.POM文件

<?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>2.1.7.RELEASE</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <groupId>lucky</groupId>

    <artifactId>day23_springboot_mabatis_test02</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <name>day23_springboot_mabatis_test02</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-jdbc</artifactId>

        </dependency>

        <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>2.1.0</version>

        </dependency>

        <dependency>

            <groupId>mysql</groupId>

            <artifactId>mysql-connector-java</artifactId>

            <scope>runtime</scope>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

    </dependencies>

    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

            <!-- mybatis generator 自动生成代码插件 -->

            <plugin>

                <groupId>org.mybatis.generator</groupId>

                <artifactId>mybatis-generator-maven-plugin</artifactId>

                <version>1.3.2</version>

                <configuration>

                    <configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile>

                    <overwrite>true</overwrite>

                    <verbose>true</verbose>

                </configuration>

            </plugin>

        </plugins>

    </build>

</project>

红色部分需要人为添加。

6.application.properties文件

#DB Configuration:

spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver

spring.datasource.url=jdbc:mysql://localhost:3306/springboot?serverTimezone=UTC&useSSL=false

spring.datasource.username=root

spring.datasource.password=plj824

#spring集成Mybatis环境

#pojo别名扫描包

mybatis.type-aliases-package=lucky.day23_springboot_mabatis_test02.model

#加载Mybatis映射文件

mybatis.mapper-locations=classpath:mapper/*Mapper.xml

7.使用mybatis generator 自动生成代码

配置pom.xml中generator 插件所对应的配置文件 ${basedir}/src/main/resources/generator/generatorConfig.xml

<?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>

    <!-- 数据库驱动:选择你的本地硬盘上面的数据库驱动包,根据实际修改-->

    <classPathEntry  location="E:\jar_package\mysql-connector-java-8.0.13.jar"/>

    <context id="DB2Tables"  targetRuntime="MyBatis3">

        <commentGenerator>

            <property name="suppressDate" value="true"/>

            <!-- 是否去除自动生成的注释 true：是 ： false:否 -->

            <property name="suppressAllComments" value="true"/>

        </commentGenerator>

        <!--数据库链接URL，用户名、密码，根据实际修改 -->

        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3306/springboot?serverTimezone=UTC&amp;useSSL=false" userId="root" password="plj824">

        </jdbcConnection>

        <javaTypeResolver>

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

        </javaTypeResolver>

        <!-- 生成模型的包名和位置，根据实际修改-->

        <javaModelGenerator targetPackage="lucky.day23_springboot_mabatis_test02.model" 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-->

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

            <property name="enableSubPackages" value="true"/>

        </sqlMapGenerator>

        <!-- 生成DAO的包名和位置，根据实际修改-->

        <javaClientGenerator type="XMLMAPPER" targetPackage="lucky.day23_springboot_mabatis_test02.mapper" targetProject="src/main/java">

            <property name="enableSubPackages" value="true"/>

        </javaClientGenerator>

        <!-- 要生成的表 tableName是数据库中的表名或视图名 domainObjectName是实体类名-->

        <table tableName="users" domainObjectName="Users" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>

    </context>

</generatorConfiguration>

点击Edit Configurations

添加配置

mybatis-generator:generate -e

注意！！！同一张表一定不要运行多次，因为mapper的映射文件中会生成多次的代码，导致报错，切记

8.运行结果

参考文献：

https://blog.csdn.net/winter_chen001/article/details/77249029

https://www.cnblogs.com/little-rain/archive/2019/06/22/11063410.html

巴特西

002 spring boot框架，引入mybatis-generator插件，自动生成Mapper和Entity

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