https://github.com/dveeden/udf_fileexists

MySQL UDF which tests if a file exists
https://github.com/dveeden/udf_fileexists

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MySQL UDF which tests if a file exists

• Host: GitHub
• URL: https://github.com/dveeden/udf_fileexists
• Owner: dveeden
• Created: 2013-04-10T12:18:50.000Z (over 11 years ago)
• Default Branch: master
• Last Pushed: 2013-04-10T12:23:16.000Z (over 11 years ago)
• Last Synced: 2023-03-23T22:11:57.078Z (over 1 year ago)
• Language: C
• Size: 105 KB
• Stars: 1
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
Description

===========

An MySQL UDF which can be used to test if a file exists. This can be used to verify if a database records points to an existing file.

It returns 1 if the file exists and 0 if the file is missing.

This is only a proof of concept.

Installation

============

    $ gcc -o udf_fileexists.so udf_fileexists.c `mysql_config --include` -shared -fPIC

    mysql> CREATE FUNCTION udf_fileexists RETURNS INTEGER SONAME 'udf_fileexists.so';

Example

=======

    mysql> SELECT udf_fileexists('/etc/hosts');

    +------------------------------+

    | udf_fileexists('/etc/hosts') |

    +------------------------------+

    |                            1 |

    +------------------------------+

    1 row in set (0.00 sec)

    

    mysql> SELECT udf_fileexists('/does/not/exist');

    +-----------------------------------+

    | udf_fileexists('/does/not/exist') |

    +-----------------------------------+

    |                                 0 |

    +-----------------------------------+

    1 row in set (0.00 sec)

    

    mysql> CREATE TABLE files(filename VARCHAR(200));

    Query OK, 0 rows affected (0.01 sec)

    

    mysql> INSERT INTO files VALUES('/etc/hosts'),('/etc'),('/does/not/exist'),('/nonexistend');

    Query OK, 4 rows affected (0.00 sec)

    Records: 4  Duplicates: 0  Warnings: 0

    

    mysql> SELECT filename,udf_fileexists(filename) FROM files;

    +-----------------+--------------------------+

    | filename        | udf_fileexists(filename) |

    +-----------------+--------------------------+

    | /etc/hosts      |                        1 |

    | /etc            |                        1 |

    | /does/not/exist |                        0 |

    | /nonexistend    |                        0 |

    +-----------------+--------------------------+

    4 rows in set (0.00 sec)

    

    mysql> SELECT filename,udf_fileexists(filename) AS `exists` FROM files WHERE udf_fileexists(filename);

    +------------+--------+

    | filename   | exists |

    +------------+--------+

    | /etc/hosts |      1 |

    | /etc       |      1 |

    +------------+--------+

    2 rows in set (0.01 sec)