MySQL更新存放JSON的字段、\“ 转义成 “的问题描述
本篇介绍在执行MySQL线上变更时遇到的问题,表现为"更新JSON字段时,实际更新的值与SQL语句中的值不一致,JSON格式错误",如下;
问题描述
处理线上问题,需要新插入一条记录;将原JSON粘贴出来,修改部分字段,然后提交SQL更新语句,原始JSON如下:
?1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | { "playerQualifyType" : 1 , "surveyId" : 14 , "playerRegisterEndTime" : 1670860799000 , "planName" : "《碧蓝大陆》先锋测试招募!" , "planStatus" : 2 , "playerRegisterStartTime" : 1669860000000 , "gameName" : "碧蓝大陆" , "developerName" : "海南羽弘信息技术有限公司" , "planStartTime" : 1673316000000 , "qualificationCodeUrl" : "" , "updateTime" : 1669777099000 , "planPlayerNum" : 1500 , "extend" : "{\"innerDesc\":\"\",\"planId\":16,\"verifyOperator\":\"Akira-11126666\",\"verifyResultDesc\":\"\",\"verifyResultDescImgList\":[],\"verifyResultStatus\":2,\"verifyTime\":1669777099887}" , "planEndTime" : 1673884800000 , "pkgStatus" : 0 } |
现提交SQL变更单,执行SQL语句如下:
?1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | update t set `json_field` = ' { "playerQualifyType": 1, "surveyId": 14, "playerRegisterEndTime": 1670860799000, "planName": "《碧蓝大陆》先锋测试招募!", "planStatus": 2, "playerRegisterStartTime": 1669860000000, "gameName": "碧蓝大陆", "developerName": "海南羽弘信息技术有限公司", "planStartTime": 1673316000000, "qualificationCodeUrl": "", "updateTime": 1669777099000, "planPlayerNum": 1500, "extend": "{\"innerDesc\":\"\",\"planId\":16,\"verifyOperator\":\"Akira-11126666\",\"verifyResultDesc\":\"\",\"verifyResultDescImgList\":[],\"verifyResultStatus\":2,\"verifyTime\":1669777099887}", "planEndTime": 1673884800000, "pkgStatus": 0 } ' where id = 55; |
结果数据库中更新后查出来的纪录如下,不满足JSON格式了,仔细检查发现是extend字段的值中的反斜杠全部没有了,JSON解析失败;
?1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | { "playerQualifyType" : 1 , "surveyId" : 14 , "playerRegisterEndTime" : 1670860799000 , "planName" : "《碧蓝大陆》先锋测试招募!" , "planStatus" : 2 , "playerRegisterStartTime" : 1669860000000 , "gameName" : "碧蓝大陆" , "developerName" : "海南羽弘信息技术有限公司" , "planStartTime" : 1673316000000 , "qualificationCodeUrl" : "" , "updateTime" : 1669777099000 , "planPlayerNum" : 1500 , "extend" : "{" innerDesc ":" "," planId ":16," verifyOperator ":" Akira -11126666 "," verifyResultDesc ":" "," verifyResultDescImgList ":[]," verifyResultStatus ":2," verifyTime ":1669777099887}" , "planEndTime" : 1673884800000 , "pkgStatus" : 0 } |
问题排查
联系DBA描述问题,得到的回复是——
\"相当于就转义成 "了,这是MySQL自身处理的结果;
实验如下:
而代码中执行的就没问题,原因是代码中该字段对应的Java类型为String,也就是说原JSON的外层因为套了一层双引号"",因此还会有一次转义符的嵌套,如下;
?1 | \"extend\":\"{\\\"innerDesc\\\":\\\"\\\",\\\"planId\\\":16,\\\"verifyOperator\\\":\\\"Akira-11126666\\\",\\\"verifyResultDesc\\\":\\\"\\\",\\\"verifyResultDescImgList\\\":[],\\\"verifyResultStatus\\\":2,\\\"verifyTime\\\":1669777099887}\" |
因此,代码中执行JSON字符串的MySQL插入,实际入库的值与预期一致;正确的SQL如下:
?1 2 3 4 5 | update t set `json_field` = ' {\"playerQualifyType\":1,\"surveyId\":14,\"playerRegisterEndTime\":1670860799000,\"planName\":\"《碧蓝大陆》先锋测试招募!\",\"planStatus\":2,\"playerRegisterStartTime\":1669860000000,\"gameName\":\"碧蓝大陆\",\"developerName\":\"海南羽弘信息技术有限公司\",\"planStartTime\":1673316000000,\"qualificationCodeUrl\":\"\",\"updateTime\":1669777099000,\"planPlayerNum\":1500,\"extend\":\"{\\\"innerDesc\\\":\\\"\\\",\\\"planId\\\":16,\\\"verifyOperator\\\":\\\"Akira-11126666\\\",\\\"verifyResultDesc\\\":\\\"\\\",\\\"verifyResultDescImgList\\\":[],\\\"verifyResultStatus\\\":2,\\\"verifyTime\\\":1669777099887}\",\"planEndTime\":1673884800000,\"pkgStatus\":0} ' where id = 55; |
解决方案
在更新Mysql表的JSON字符串字段时,步骤应该如下:
?1. 输入查询语句,找到目标记录,复制JSON字段的值到JSON编辑工具中修改JSON中的属性值
2. 将修改后的JSON粘贴到IDE中,IDE用双引号接收这一串JSON;
3. 执行SQL时,SQL语句中的值以IDE中被双引号包裹的字符串值为SQL中的新的value;
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | // 将JSON粘贴进来 整体作为SQL更新语句中的新的value 这里也可以不格式化JSON String formatValue = "{\n" + " \"playerQualifyType\": 1,\n" + " \"surveyId\": 14,\n" + " \"playerRegisterEndTime\": 1670860799000,\n" + " \"planName\": \"《碧蓝大陆》先锋测试招募!\",\n" + " \"planStatus\": 2,\n" + " \"playerRegisterStartTime\": 1669860000000,\n" + " \"gameName\": \"碧蓝大陆\",\n" + " \"developerName\": \"海南羽弘信息技术有限公司\",\n" + " \"planStartTime\": 1673316000000,\n" + " \"qualificationCodeUrl\": \"\",\n" + " \"updateTime\": 1669777099000,\n" + " \"planPlayerNum\": 1500,\n" + " \"extend\": \"{\\\"innerDesc\\\":\\\"\\\",\\\"planId\\\":16,\\\"verifyOperator\\\":\\\"Akira-11126666\\\",\\\"verifyResultDesc\\\":\\\"\\\",\\\"verifyResultDescImgList\\\":[],\\\"verifyResultStatus\\\":2,\\\"verifyTime\\\":1669777099887}\",\n" + " \"planEndTime\": 1673884800000,\n" + " \"pkgStatus\": 0\n" + "}" ; // 未格式化 会少去/n换行符 String value = "{\"playerQualifyType\":1,\"surveyId\":14,\"playerRegisterEndTime\":1670860799000,\"planName\":\"《碧蓝大陆》先锋测试招募!\",\"planStatus\":2,\"playerRegisterStartTime\":1669860000000,\"gameName\":\"碧蓝大陆\",\"developerName\":\"海南羽弘信息技术有限公司\",\"planStartTime\":1673316000000,\"qualificationCodeUrl\":\"\",\"updateTime\":1669777099000,\"planPlayerNum\":1500,\"extend\":\"{\\\"innerDesc\\\":\\\"\\\",\\\"planId\\\":16,\\\"verifyOperator\\\":\\\"Akira-11126666\\\",\\\"verifyResultDesc\\\":\\\"\\\",\\\"verifyResultDescImgList\\\":[],\\\"verifyResultStatus\\\":2,\\\"verifyTime\\\":1669777099887}\",\"planEndTime\":1673884800000,\"pkgStatus\":0}" ; |
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原文链接:https://blog.csdn.net/minghao0508/article/details/128372093
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