CSV storage engine stores data in text files
using comma-separated values format.
CSV storage engine is always compiled into
the MySQL server.
To examine the source for the
CSV engine, look in
storage/csv directory of a MySQL source
When you create a
CSV table, the server creates a
table format file in the database directory. The file begins with
the table name and has an
.frm extension. The
storage engine also creates a data file. Its name begins with the
table name and has a
.CSV extension. The data
file is a plain text file. When you store data into the table, the
storage engine saves it into the data file in comma-separated values
CREATE TABLE test (i INT NOT NULL, c CHAR(10) NOT NULL)->
ENGINE = CSV;Query OK, 0 rows affected (0.12 sec) mysql>
INSERT INTO test VALUES(1,'record one'),(2,'record two');Query OK, 2 rows affected (0.00 sec) Records: 2 Duplicates: 0 Warnings: 0 mysql>
SELECT * FROM test;+------+------------+ | i | c | +------+------------+ | 1 | record one | | 2 | record two | +------+------------+ 2 rows in set (0.00 sec)
Creating a CSV table also creates a corresponding Metafile that
stores the state of the table and the number of rows that exist in
the table. The name of this file is the same as the name of the
table with the extension
If you examine the
test.CSV file in the
database directory created by executing the preceding statements,
its contents should look like this:
"1","record one" "2","record two"
This format can be read, and even written, by spreadsheet applications such as Microsoft Excel or StarOffice Calc.
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