The CSV Storage Engine
The CSV storage engine stores data in text files using comma-separated values format.
The CSV storage engine is always compiled into the MySQL server.
To examine the source for the CSV engine, look in the 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
mysql 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 CSM.
If you examine the test.CSV file in the database directory created by executing the preceding
statements, its contents should look like this:
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