如何一次将多个JSON文件插入到postgresql表中？

问题描述：

我有多个JSON文件，它们都具有相同的格式，但根据每个事务其值是不同的。我想将此数据迁移到postgresql表。进行此操作的最佳方法是什么？

I have multiple JSON files, they all have same format but the values are different based on each transaction. I want to migrate this data to a postgresql table. What is the best way to proceed with this?

现在，我正在使用以下查询：

Right now, I am using the following query:

CREATE TABLE TEST (MULTIPROCESS VARCHAR(20), HTTP_REFERER VARCHAR(50));
INSERT INTO TEST SELECT MULTIPROCESS, HTTP_REFERER FROM json_populate_record(NULL::test, '{"multiprocess": true,"http_referer": "http://localhost:9000/"}');

但是，一旦文件数量变大，使用此技术将变得非常困难。还有其他有效方法吗？

But, once the number of files become large, it becomes very difficult to use this technique. Is there any other way to do this effectively?

答

您可以使用横向联接可一次插入多个行：

You could use a LATERAL JOIN to do insert more than one row at a time:

 WITH 
  json AS(
   VALUES('{"multiprocess": true,"http_referer":"http://localhost:9000"}')
     ,('{"multiprocess": false,"http_referer": "http://localhost:9001/"}')
     ,('{"multiprocess": true,"http_referer": "http://localhost:9002/"}')
) INSERT INTO test 
   SELECT multiprocess, http_referer 
   FROM   json, LATERAL json_populate_record(NULL::test, json.column1::json);

或者您可以先插入到临时表中，然后再填充其他表。

Or you could insert into a staging table first and then populate your other table.

如何一次将多个JSON文件插入到postgresql表中？

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