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rows.4. Now, it seems obvious that the where, having, or group clause can be used in queries.Ex: "select number, count (name) from samplefile1.csv group by number having count (name)> = 1"5. we can filter data based on conditions to obtain all the data that meets the conditions in the file at a time. you can use the rowfilter/filter attribute or dataview/recordse. as I have said, once we read data into dataset/recordset, we can use them to complete a
Other file formats
We have discussed how to read comma-separated files (CSV. So how can we process tab-Separated Files and fixed-length files?
It mainly lies in the connection string we provide. Let's take a look at the details of the connection string.
Provider = Microsoft. Jet. OLEDB.4.0; Data Source = C: \ FolderName;Extended Properties = "text; HDR = YES; FMT = Deli
Description
Http://www.codeproject.com/KB/database/ReadTextFile.aspx? Display = print
We occasionally try to read and process data from the local file (.txt,.csv,. Tab. The most common method is to use streamreader (. NET) to read files row by row.
Suppose we can read files as a database and process data using a Table query, we will find many shortcomings in the above method:
1. Connect to the environment.
Php export csv format data and convert numbers into text ideas and code sharing. Php export csv format data implementation: first define a string to store content, such as $ exportdata Rule 111, Rule 222, audit 222, Rule 222, server 2222, rule 1, rule 2, rule 3: match characters. php exports csv format data when settin
back. For example
Copy the Code code as follows:$filename = "plcnetinfo_{$date}.csv";Header ("Content-type:application/vnd.ms-excel");Header ("content-disposition:attachment; Filename= $filename ");
Header ("expires:0");Header ("Pragma:public");Header ("Cache-control:must-revalidate, Post-check=0, pre-check=0");Header ("Cache-control:public");Echo (Mb_convert_encoding ($exportdata, "gb2312", "UTF-8"));
However, when exporting the number,
run the output in the back. For example
Copy Code code as follows:
$filename = "plcnetinfo_{$date}.csv";
Header ("Content-type:application/vnd.ms-excel");
Header ("content-disposition:attachment; Filename= $filename ");
Header ("expires:0");Header ("Pragma:public");Header ("Cache-control:must-revalidate, Post-check=0, pre-check=0");Header ("Cache-control:public");Echo (Mb_convert_encoding ($exportdata, "gb2312", "UTF-8"));
But
Some friends use the mobile phone helper exported CSV files (such as address book, etc.), are comma-delimited, how can you quickly convert the data into a table? In fact, word has a quick way to convert text into a table:
1, use Word to open a text file, or copy the text to a Word document;
2, select the text part th
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