How to use Mybatis in springboot

springboot integrates Mybatis

Step one:

Add Mybatis dependency

<!--mybatis整合springboot框架的起步依赖-->
<dependency>
    <groupid>org.mybatis.spring.boot</groupid>
    <artifactid>mybatis-spring-boot-starter</artifactid>
    <version>2.0.0</version>
</dependency>

Step two:

Add mysql driver
The reason why there is no version number is because it inherits from the parent project. Of course, you can also specify a version number yourself

<!--添加mysql驱动-->
<dependency>
    <groupid>mysql</groupid>
    <artifactid>mysql-connector-java</artifactid>
    <!-- 指定版本号 <version>5.1.9<version> -->
</dependency>

Use the reverse engineering provided by Mybatis to generate entity beans, mapping files, and DAO interfaces

Step one:

Create the GeneratorMapper.xml file in the project root directory with the following configuration:

<?xml  version="1.0" encoding="utf-8"?>
nbsp;generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorconfiguration>
    <!--指向连接数据库的 JDBC 驱动包所在位置，指定到你本机的完整路径-->
    <classpathentry></classpathentry>
    <!--配置table表信息内容体，targetRuntime 指定采用MyBatis3的版本-->
    <context>
        <commentgenerator>
            <property></property>
        </commentgenerator>
        <!--配置数据库连接信息-->
        <jdbcconnection>
        </jdbcconnection>
        <!--生成Model类，targetPackage指定model类的包名，
        targetProject指定生成的model类放在eclipse的哪个工程下边、-->
        <javamodelgenerator>
            <property></property>
            <property></property>
        </javamodelgenerator>
        <!--生成Mybatis的Mapper.xml 文件，targetPackage指定mapper.xml文件的包名，
        targetProject指定生成的mapper.xml放在eclipse的哪个工程下边-->
        <sqlmapgenerator>
            <property></property>
        </sqlmapgenerator>
        <!--生成Mybatis的Mapper接口类文件，targetPackage指定Mapper接口类的包名，
        targetProject指定生成的Mapper接口放在eclipse的哪个工程下边-->
        <javaclientgenerator>
            <property></property>
        </javaclientgenerator>
 
        <!--数据库表名及对应的Java模型类名
        有100张表，就需要指定100个table
        tableName：数据库中表的名字；
        domainObjectName：表对应生成的实体类的名字叫什么
        -->
        <table></table>
    </context>
</generatorconfiguration>

The second step
is configured as follows in pom.xml:

<!--在plugins标签中，添加如下代码-->
<!--mybatis 代码自动生成插件-->
<plugin>
    <groupid>org.mybatis.generator</groupid>
    <artifactid>mybatis-generator-maven-plugin</artifactid>
    <version>1.3.7</version>
    <dependencies>
        <dependency>
            <groupid>mysql</groupid>
            <artifactid>mysql-connector-java</artifactid>
            <version>8.0.15</version>
        </dependency>
    </dependencies>
    <configuration>
        <!--配置文件的位置-->
        <configurationfile>GeneratorMapper.xml</configurationfile>
        <verbose>true</verbose>
        <overwrite>true</overwrite>
    </configuration>
</plugin>

The third step
When double-clicking the following to execute,

There is a pit here. Mine reported an error here. The error message is as follows:

Failed to execute goal org.mybatis.generator:mybatis-generator-maven-plugin:1.3.7: generate (default-cli) on project sprint_boot_01: Communications link failure

99% is because the connectionURL in the driver and configuration database information is configured incorrectly. My solution:

driverClass="com.mysql.cj.jdbc.Driver"
connectionURL="jdbc:mysql://127.0.0.1:3306/java_pro?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf8&useSSL=false"

Then double-click to execute, success:

The generated directory is as follows:

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