SpringBoot集成MyBatis

1、加入起步依赖

<dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.0.0</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

2、配置数据库连接信息

mybatis.mapper-locations=classpath:com/example/springboot/mapper/*.xml
#配置数据库连接信息
spring.datasource.username=root
spring.datasource.password=123
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/mybatis?serverTimezone=GMT&characterEncoding=utf8

3、在项目目录下面放置GeneratorMapper.xml，内容如下：

<?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>
    <!--指定连接数据库的JDBC驱动包位置-->
    <classPathEntry location="D:/MySQL/mysql-connector-java-5.1.44-bin.jar"/>

    <!--配置table表格信息内容体，targetRuntime指定采用Mybatis3版本-->
    <context id="tables" targetRuntime="Mybatis3">

       <!--抑制生成注释，由于生成注释是英文，可以不让生成-->
        <commentGenerator>
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>

        <!--配置数据库连接信息-->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://127.0.0.1:3306/mybatis?serverTimezone=GMT"
                        userId="root"
                        password="123">
        </jdbcConnection>
        <!--生成model类，targetPackage指定model类包名，targetProject指定生成model放在哪个工程下-->
        <javaModelGenerator targetPackage="com.example.springboot.model" targetProject="src/main/java">
            <property name="enableSubPackages" value="false"/>
            <property name="trimString" value="false"/>
        </javaModelGenerator>

        <!--生成mybatis的Mapper.xml文件，targetPackage指定Mapper.xml包名，targetProject指定生成Mapper.xml放在哪个工程下-->
        <sqlMapGenerator targetPackage="com.example.springboot.mapper" targetProject="src/main/java">
            <property name="enableSubPackages" value="false"/>
        </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Mapper接口放在哪个工程下-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.example.springboot.mapper" targetProject="src/main/java">
            <property name="enableSubPackages" value="false"/>
        </javaClientGenerator>

        <!--数据库表名及对应java模型类名-->
        <table tableName="student"
               domainObjectName="Student"
               enableCountByExample="false"
               enableUpdateByExample="false"
               enableDeleteByExample="false"
               enableSelectByExample="false"
               selectByExampleQueryId="false"/>
    </context>
</generatorConfiguration>

4、在pom.xml添加mybatis代码自动生成插件依赖

 <!--mybatis代码自动生成插件-->
        <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>GeneratorMapper.xml</configurationFile>
                    <verbose>true</verbose>
                    <overwrite>true</overwrite>
                </configuration>
            </plugin>

5、在Maven项目里plugins的mybatis-generator，双击mybatis-generator:generate，会自动生成model和mapper（StudentMapper.java、StudentMapper.xml）

6、需要将StudentMapper.xml与StudentMapper.java编译在同一地方，所以需要在pom.xml添加：

 <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                </includes>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.*</include>
                </includes>
            </resource>
            <resource>
                <directory>src/main/webapp</directory>
                <targetPath>META-INF/resources</targetPath>
                <includes>
                    <include>**/*.*</include>
                </includes>
            </resource>
        </resources>