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【BLE技术内幕】BLE技术揭秘 - 创客硬件开发 - 清泛IT论坛，有思想、有深度
...参数组在低功耗蓝牙设备的功率优化中起重要作用。以下列表给出了连接参数设置中权衡的总体概述。减少连接间隔如下：增加两个设备的功耗增加双向吞吐量减少任一方向发送数据的时间
增加连接间隔如下：降低两个设备的...
Git: How to remove file from historical commit?
...ilter "git rm --cached --ignore-unmatch PathRelativeRepositoryRoot/bigfile.csv" -- --all
After removing the big file, I was able to push my changes to github master.
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Bulk insert with SQLAlchemy ORM
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Compared to inserting the same data from CSV with \copy with psql (from the same client to the same server), I see a huge difference in performance on the server side resulting in about 10x more inserts/s. Apparently is bulk-loading using \copy (or COPY on the serve...
Saving an Object (Data persistence)
...Error though! so does cPickle, pickle and hickle.
– Färid Alijani
Oct 10 '19 at 7:45
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In Firebase, is there a way to get the number of children of a node without loading all the node dat
...baseio.com/posts/comments.json?shallow=true
– Osama Xäwãñz
Aug 12 '17 at 15:37
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Serializing a list to JSON
...... stack, which provides a set of very fast serializers for Json, JSV and CSV.
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What is the recommended batch size for SqlBulkCopy?
...so spent some time looking into. I am looking to optimize importing large CSV files (16+ GB, 65+ million records, and growing) into a SQL Server 2005 database using a C# console application (.Net 2.0). As Jeremy has already pointed out, you will need to do some fine-tuning for your particular circ...
Python strptime() and timezones?
I have a CSV dumpfile from a Blackberry IPD backup, created using IPDDump.
The date/time strings in here look something like this
(where EST is an Australian time-zone):
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Reading a file line by line in Go
...ver a file, it would be trivial to first file, _ := os.Open("/path/to/file.csv") and then scan over the file handle: scanner := bufio.NewScanner(file)
– Evan Plumlee
Aug 18 '13 at 13:28
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使用虚拟现实和App Inventor进行实验 · App Inventor 2 中文网
...pp Inventor 不包含复制文件的操作。幸运的是，由于 Taifun Bär（谢谢 Taifun！），有一个 App Inventor 扩展，它提供了一个带有 TaifunFile.copy 操作的组件 TaifunFile。可以从此处下载扩展。您应该在构建 Expeditions 和 Virtuality 演示之前安装...