<mybatis-generator-plugin-version>1.4.1</mybatis-generator-plugin-version>

            <!-- mybatis ?成器插件 -->
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>${mybatis-generator-plugin-version}</version>
                <executions>
                    <execution>
                        <id>Generate MyBatis Artifacts</id>
                        <phase>deploy</phase>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                    </execution>
                </executions>
                <!-- 相關(guān)配置 -->
                <configuration>
                    <!-- 打開(kāi)?志 -->
                    <verbose>true</verbose>
                    <!-- 允許覆蓋 -->
                    <overwrite>true</overwrite>
                    <!-- 配置?件路徑 -->
                    <configurationFile>
                        src/main/resources/mybatis/generatorConfig.xml
                    </configurationFile>
                </configuration>
            </plugin>

<?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>
    <!-- 驅(qū)動(dòng)包路徑，location中路徑替換成??本地路徑 -->
    <classPathEntry location="D:\class\source\mysql-connector-java-5.1.49.jar"/>
    <context id="DB2Tables" targetRuntime="MyBatis3">
        <!-- 禁??動(dòng)?成的注釋 -->
        <commentGenerator>
            <property name="suppressAllComments" value="true"/>
            <property name="suppressDate" value="true"/>
        </commentGenerator>
        <!-- 連接配置 -->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://127.0.0.1:3306/javanav_db?
characterEncoding=utf8&amp;useSSL=false"
                        userId="root"
                        password="1111">
        </jdbcConnection>
        <javaTypeResolver>
            <!-- ?數(shù)統(tǒng)?轉(zhuǎn)為BigDecimal -->
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>
        <!-- 實(shí)體類(lèi)?成位置 -->
        <javaModelGenerator targetPackage="com.example.cyk.model"
                            targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>
        <!-- mapper.xml?成位置 -->
        <sqlMapGenerator targetPackage="mapper"
                         targetProject="src/main/resources">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>
        <!-- mapper 接口?成位置 -->
        <javaClientGenerator type="XMLMAPPER"
                             targetPackage="com.example.cyk.mapper" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>
        <!-- 配置?成表與實(shí)例, 只需要修改表名tableName, 與對(duì)應(yīng)類(lèi)名domainObjectName 即
       可-->
        <table tableName="j_article" domainObjectName="Article"
               enableSelectByExample="false"
               enableDeleteByExample="false" enableDeleteByPrimaryKey="false"
               enableCountByExample="false"
               enableUpdateByExample="false">
            <!-- 類(lèi)的屬性?數(shù)據(jù)庫(kù)中的真實(shí)字段名做為屬性名, 不指定這個(gè)屬性會(huì)?動(dòng)轉(zhuǎn)換 _ 為
           駝峰命名規(guī)則-->
            <property name="useActualColumnNames" value="true"/>
        </table>
        <table tableName="j_article_reply" domainObjectName="ArticleReply"
               enableSelectByExample="false"
               enableDeleteByExample="false" enableDeleteByPrimaryKey="false"
               enableCountByExample="false"
               enableUpdateByExample="false">
            <property name="useActualColumnNames" value="true"/>
        </table>
        <table tableName="j_board" domainObjectName="Board"
               enableSelectByExample="false" enableDeleteByExample="false"
               enableDeleteByPrimaryKey="false" enableCountByExample="false"
               enableUpdateByExample="false">
            <property name="useActualColumnNames" value="true"/>
        </table>
        <table tableName="j_message" domainObjectName="Message"
               enableSelectByExample="false"
               enableDeleteByExample="false" enableDeleteByPrimaryKey="false"
               enableCountByExample="false"
               enableUpdateByExample="false">
            <property name="useActualColumnNames" value="true"/>
        </table>
        <table tableName="j_user" domainObjectName="User"
               enableSelectByExample="false" enableDeleteByExample="false"
               enableDeleteByPrimaryKey="false" enableCountByExample="false"
               enableUpdateByExample="false">
            <property name="useActualColumnNames" value="true"/>
        </table>
    </context>
</generatorConfiguration>

<!-- useGeneratedKeys = true -->
<!-- keyProperty = 主鍵字段--> 
 
<!-- 當(dāng)插??條數(shù)據(jù)后，可以通過(guò)user.getId()獲取到?動(dòng)?成的Id值，如果?法中需要?即獲取Id值，加?這個(gè)配置 --> 
<insert id="insert" parameterType="com.example.cyk.model.User" 
useGeneratedKeys="true" keyProperty="id" >

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

@SpringBootTest
public class TestMapper {
 
    @Autowired
    private UserMapper userMapper;
 
    @Test
    public void select() {
        User user = userMapper.selectByPrimaryKey(1L);
        System.out.println(user);
    }
 
}