Java导入hashmap,从HashMap高效批量插入/复制到表中

最新推荐文章于 2025-03-14 00:15:00 发布

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最新推荐文章于 2025-03-14 00:15:00 发布

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文章标签： Java导入hashmap

在处理大量数据时，如何从HashMap高效地批量插入或复制到Postgres数据库表中？考虑到HashMap大小为50,000，每个内部Map包含50个键值对，与表的50列相对应。文章讨论了使用COPY命令的可行性，参数限制，以及是否应该将HashMap转换为SQL文件。最终提出使用Java的PreparedStatement和批量插入作为解决方案。" 85251056,7880792,理解PyQt：信号、槽与事件处理,"['PyQt', 'GUI开发', '事件驱动', '多线程']

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Task:

Given this HashMap structure: Map> mainMap = new HashMap<>()

I want to INSERT or COPY each value of the inner Map into its own cell in my database.

The size() of mainMap if 50,000.

The size() of the inner Map is 50.

The table to be inserted into has 50 columns.

Each column's header is the key for the inner Map.

EDIT: Originally the user uploads a large spreadsheet with 35 of the 50 columns. I then "cleanse" that data with various formatting, and I add my own 15 new pairs into the innerMap for each mainMap entry. I can't directly COPY from the user's source file to my database without cleansing/formatting/adding.

Once I'm done iterating the spreadsheet and building mainMap, that's when I need to insert into my database table efficiently.

Research:

I've read that COPY i