springboot配置处理mybatis带有下划线数据库字段无法映射实体，解决驼峰命名映射问题

1.问题

接口请求后查询发现返回的部分数据为null,都是大小写字段驼峰命名的为空

[{"id":1,"userName":null,"phone":"13126789145","province":"03","userAccount":null,"userPassword":null}]

2.代码文件配置

（1）数据库设计字段为：

create table DEMO_USER
(
  id            NUMBER(10) not null,
  user_name     VARCHAR2(100),
  phone         VARCHAR2(30),
  province      VARCHAR2(50),
  user_account  VARCHAR2(50),
  user_password VARCHAR2(50)
)

（2）对应实体：

public class DemoUserEntity implements Serializable {
    private static final long serialVersionUID = 1L;

    /**
     * $column.comments
     */

    private Integer id;
    /**
     * $column.comments
     */
    private String userName;
    /**
     * $column.comments
     */
    private String phone;
    /**
     * $column.comments
     */
    private String province;
    /**
     * $column.comments
     */
    private String userAccount;
    /**
     * $column.comments
     */
    private String userPassword;

}

（3）springboot项目配置文件 application.properties

#mybatis的相关配置
#mybatis.config-locations=classpath:mybatis/mybatis-config.xml
#mapper配置文件
mybatis.mapper-locations=classpath:mapper/*.xml
#mybatis.type-aliases-package=com.beiluo.demo.entity

3.解决方案

添加配置如下

#开启驼峰命名 处理下划线映射到实体
#mybatis.configuration.map-underscore-to-camel-case=true

最后springboot项目配置文件 application.properties为

#mybatis的相关配置
#mybatis.config-locations=classpath:mybatis/mybatis-config.xml
#mapper配置文件
mybatis.mapper-locations=classpath:mapper/*.xml
#mybatis.type-aliases-package=com.beiluo.demo.entity
#开启驼峰命名 处理下划线映射到实体
mybatis.configuration.map-underscore-to-camel-case=true

查询后有数据

[{"id":1,"userName":"张三","phone":"13126789145","province":"03","userAccount":"zhangsan","userPassword":"zhangsan"}]