mysql存json数据时的查询办法

很多时候mysql的一列当中存的是json格式的数据，这时候如果要查询某个key对应的值的时候要如何查询呢，这里记录一种查询方法：

json列的值：

{"InventoryMainTypeCode": 1, "InventoryMainTypeName": "GOOD"}

现在要查询InventoryMainTypeCode为xxx或者InventoryMainTypeName为xxx的数据：（这里以springboot+mybatis为例子）

代码：

请求类：

java 复制代码

Query query = new Query();

java 复制代码

@Data
public class Query implements Serializable {

    
    private Map<String, Object> featureMap = new HashMap<>();

    public void setFeature(String feature) {
        if (StringUtils.isNotBlank(feature)) {
            featureMap = JSON.parseObject(feature, Map.class);
        }
    }

    public void addFeature(String key, Object value) {
        if (StringUtils.isBlank(key)) {
            return;
        }
        this.featureMap.put(key, value);
    }
    public void addFeatureMap(Map<String, Object> featureMaps) {
        if (MapUtils.isNotEmpty(featureMaps)){
            this.featureMap.putAll(featureMaps);
        }
    }
}

在代码中将key添加到Feature中：

java 复制代码

query.addFeature(DicConst.InventoryMainTypeCode.name(), 1);
List<ResultDTO> dTOS = dictionaryManager.queryDicByParam(query);

mapper文件：

java 复制代码

 List<CnbDictionaryDO> queryDicByParam(CnbDictionaryQuery query);

xml:

xml 复制代码

  <select id="queryDicByParam" resultMap="BaseResultMap">
        select
        <include refid="Base_Column_List"/>
        from
        <include refid="Table_Name"/>
        <where>
            <if test="id != null">
                and id = #{id}
            </if>
         
            <if test="featureMap != null and featureMap.size > 0">
                <foreach collection="featureMap" index="key" item="value">
                    <if test="value != null">
                        <![CDATA[and feature->'$.${key}' = #{value}]]>
                    </if>
                </foreach>
            </if>
        </where>
    </select>