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 plain text data file having a name that
begins with the table name and has a
extension. When you store data into the table, the storage engine
saves it into the data file in comma-separated values format.
mysql> CREATE TABLE test (i INT NOT NULL, c CHAR(10) NOT NULL) ENGINE = CSV; Query OK, 0 rows affected (0.06 sec) mysql> INSERT INTO test VALUES(1,'record one'),(2,'record two'); Query OK, 2 rows affected (0.05 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)
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.