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How it works... use none none integrated toembed none with none Visual Basic and Visual C# The LOAD DATA none none INFILE command works analogous to the SELECT INTO OUTFILE command discussed in the previous recipes, but as a means for importing data rather than exporting. The format options available for both commands are identical, so you can typically import data exported by a SELECT INTO OUTFILE statement using a LOAD DATA INFILE command with the same format options. As most files consist of lines terminated by a sequence of a carriage return and a line feed character, we use the LINES TERMINATED BY "\r\n" option.

The choice of the semicolon character as a separator for different fields of every line (TERMINATED BY ";") is mainly due to the fact that Excel uses this format. If you happen to receive CSV files that, for example, use a comma instead, you have to adjust this accordingly. The term FIELDS ENCLOSED BY """ tells the import to look for double quotes at the start of every field imported.

If there is one, the field is considered to end at the next double quote. To be able to have double quotes inside a field value, we define an escape character (ESCAPED BY """). With this constellation, a sequence of two double quotes is not treated as the end of the field, but as a double-quote character as part of the value.

. There"s more... The data is r none for none ead from the file using the default character set of the database. If the file uses a different character encoding, you can specify this by adding a CHARACTER SET clause after the table definition (LOAD DATA INFILE INTO TABLE sample.table1 CHARACTER SET utf8;).

Please note that the character sets ucs2, utf16, and utf32 are not supported (as of MySQL version 5.1.35).

. Managing Data See also Exporting data to a simple CSV file Importing data from custom file formats In the previo us recipe Importing data from a simple CSV file, we discussed a way of importing data from a nicely formatted file. Unfortunately, you sometimes have to deal with far less convenient data sources. In this recipe, we will present some more advanced topics of importing data from files with a less strict structure.

Obviously, it is not possible to present a universal recipe for every file format imaginable, so we will use an example that covers some of the common problems one has to tackle when importing data from custom files. For this, we will refer to the same hypothetical format as in Export data to a custom file format, which defines four initial lines (containing name of the file, a time stamp, a description, and the number of rows), a header line with the name of the columns, and subsequently the rows with the actual data to import. Each data row starts with a hash character (#), the line number, a colon, and a space.

The data values that follow the row number are separated by a pipe (. ) character a none none nd the row closes with a dollar sign ($).. Getting ready Again, the ac none none count used in the recipe needs the FILE privilege (besides the INSERT permission for the table the data should be imported into). With a SQL client, a file with the appropriate format, and a table as the import target, we are ready to go. As in previous recipes, we use sample_install as the account name, C:/source.

txt as the source file, and sample.table2 (consisting of three columns c1, c2, and c3) as the target table. We assume the source file to have the following content:.

Filename: C:/ source.txt Description: This is a file for test import to sample.table2, columns c1, c2, and c3 2009-06-14 13:25:05 Row count: 3 #Row Nr: Column c1 .

Column c2 Column c3 $ #1: 209 . Some text in my test data Some more text $ #2: 308 . Next test text for testing Text to test $ #3: 406 . "A water pipe" . Really $
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