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一个故事告诉你比特币的原理及运作机制 - 创意 - 清泛网 - 专注C/C++及内核技术

...,这样就完成了支付,此时老李在电话中听到二狗子确认账完成,就可以放心让老张把羊牵走了。 此时比特村进入了中央系统虚拟货币时代。每个村民都不需要用实物支付,支付过程变成了二狗子那边维护的账本上数字的变...
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Reading Excel files from C#

...port.Tables[0]; #region Commented code for importing data from CSV file. // string strConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;" +"Data Source=" + System.IO.Path.GetDirectoryName(fullFileName) +";" +"Extended Properties=\"Text;HDR=YES;FMT=Delimited\""...
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How do I parse a string with a decimal point to a double?

...arator from ',' to '.' and list separator from ';' to ','. You know, cause csv... Good luck to us all writing multi-culture apps ;) – Steven Spark Jun 22 '18 at 13:15 ...
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How to output a comma delimited list in jinja python template?

... While this works for creating a csv, seeing his example above, it can't be used with the surrounding anchor. – triunenature Nov 22 '15 at 6:18 ...
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What is a correct mime type for docx, pptx etc?

...config-pkg", "ras": "image/x-cmu-raster", "dae": "model/vnd.collada+xml", "csv": "text/csv", "cpt": "application/mac-compactpro", "wmlc": "application/vnd.wap.wmlc", "cgm": "image/cgm", "ice": "x-conference/x-cooltalk", "cmx": "image/x-cmx", "xar": "application/vnd.xara", "cmc": "application/vnd.cos...
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how to emulate “insert ignore” and “on duplicate key update” (sql merge) with postgresql?

...le as select * from test where false; copy temporary_table from 'data_file.csv'; lock table test; update test set data=temporary_table.data from temporary_table where test.id=temporary_table.id; insert into test select * from temporary_table where id not in (select id from test) as a" ...
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How do I write JSON data to a file?

... "the answer":42 } } Common file endings .json Alternatives CSV: Super simple format (read & write) JSON: Nice for writing human-readable data; VERY commonly used (read & write) YAML: YAML is a superset of JSON, but easier to read (read & write, comparison of JSON and YAML...
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Hidden Features of VB.NET?

...g>.Value (I found this especially handy when writing tests on parsing CSV files where every field was in quotes. It would not have been fun to escape all those quotes by hand in my test lines.) – Ryan Lundy Dec 17 '09 at 22:26 ...
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What is a good choice of database for a small .NET application? [closed]

...rgot to mention So long as you don't need relational tables you could use CSV file read as a dataset via ADO.NET. (More of a lulz suggestion than anything else but would be suitable in some cases and doesn't require additional libraries for a MS deployment. ...
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How to find out what group a given user has?

...is the script which is integrated into ansible and generating dashboard in CSV format. sh collection.sh #!/bin/bash HOSTNAME=`hostname -s` for i in `cat /etc/passwd| grep -vE "nologin|shutd|hal|sync|root|false"|awk -F':' '{print$1}' | sed 's/[[:space:]]/,/g'`; do groups $i; done|sed s/\:/\,/g|tr...