小编Mil*_*lka的帖子

我正在尝试将查询从 Redshift 转换为 Snowflake SQL。

Redshift 查询如下所示：

SELECT 
                cr.creatives as creatives
                , JSON_ARRAY_LENGTH(cr.creatives) as creatives_length
                , JSON_EXTRACT_PATH_TEXT(JSON_EXTRACT_ARRAY_ELEMENT_TEXT (cr.creatives,0),'previewUrl') as preview_url
FROM campaign_revisions cr

雪花查询如下所示：

SELECT 
                cr.creatives as creatives
                , ARRAY_SIZE(TO_ARRAY(ARRAY_CONSTRUCT(cr.creatives))) as creatives_length
                , PARSE_JSON(PARSE_JSON(cr.creatives)[0]):previewUrl as preview_url
FROM campaign_revisions cr

似乎 JSON_EXTRACT_PATH_TEXT 未正确转换，因为 Snowflake 查询会导致错误：

解析 JSON 时出错：输入中有多个文档

cr.creatives 的格式如下：

"[{""previewUrl"":""https://someurl.com/preview1.png"",""device"":""desktop"",""splitId"":null,""splitType"":null},{""previewUrl"":""https://someurl.com/preview2.png"",""device"":""mobile"",""splitId"":null,""splitType"":null}]"

有org.w3c.dom.Document中的方法，例如getElementById(String elementId)，getElementsByTagName(String tagname)等等，但有可能获得通过他们的文本值的元素？