Mybatis之map-underscore-to-camel-case开启驼峰功能

亦凉 2023-01-10 09:58 182阅读 0赞

**场景：**数据库字段是下划线，程序中使用驼峰

**目的：**实现数据库下划线字段与实体中的驼峰属性映射

**方式：**设置map-underscore-to-camel-case属性为true来开启驼峰功能

1、application.yml配置

>     mybatis:
>       mapperLocations: classpath:mapper/*.xml,classpath:mapper/base/*.xml
>       configuration:
>         map-underscore-to-camel-case: true

2、库表与实体

请注意库表中字段create\_time对应实体中createTime

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ppYWhhbzExODY_size_16_color_FFFFFF_t_70][]

import com.picc.common.util.date.DateUtil;
    import io.swagger.annotations.ApiModel;
    import io.swagger.annotations.ApiModelProperty;
    import lombok.Data;
    
    import java.util.Date;
    
    @Data
    @ApiModel(description = "客户标签")
    public class Lable{
    
        @ApiModelProperty("主键")
        private Long id;
    
        @ApiModelProperty("名称")
        private String name;
    
        @ApiModelProperty("机构")
        private String branch;
    
        @ApiModelProperty("类型1:公司,2:部门,3:个人")
        private String type;
    
        @ApiModelProperty("排序")
        private Integer sort;
    
        @ApiModelProperty("有无效标识1:有效,0:无效")
        private Integer valid;
    
        @ApiModelProperty("删除标识1:已删除,0:未删除")
        private Short deleted = 0;
    
        @ApiModelProperty(value="创建时间", example = "2021-02-01 00:00:00")
        private Date createTime = DateUtil.newDateTime();

3、SectionMapper.xml配置

<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
    <mapper namespace="com.picc.vx.market.service.provider.dao.LableDao">
    
            <select id="count" resultType="java.lang.Long">
                    select count(*) from m_lable
            </select>
          
    </mapper>

4、查询结果

即实现下划线字段与驼峰式属性的完美映射！

[
        {
            "id":2,
            "name":"音响发烧友",
            "branch":"00000002",
            "type":"2",
            "sort":1,
            "valid":1,
            "deleted":0,
            "createTime":"2021-01-20 14:43:16"
        },
        {
            "id":3,
            "name":"影迷",
            "branch":"1",
            "type":"3",
            "sort":1,
            "valid":1,
            "deleted":0,
            "createTime":"2021-01-20 14:43:59"
        }
    ]

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