mysql Archives - BinaryTides

Mysql autoincrement column that resets every month

Silver Moon — Sat, 22 Oct 2011 10:17:20 +0000

The autoincrement feature in mysql allows us to create numeric fields that automatically increment by 1 for every row inserted. It does it atomically so we don't have to worry about any duplicates or collision. However, there are situations when we need an autoincrement field to reset at regular intervals like every month or so.... Read More »

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How to List foreign keys in Mysql

Silver Moon — Sat, 05 Sep 2009 16:00:46 +0000

information_schema The following query will list out the foreign keys in mysql. It finds it out from the information_schema database. select concat(table_name, '.', column_name) as 'foreign key', concat(referenced_table_name, '.', referenced_column_name) as 'references' from information_schema.key_column_usage where referenced_table_name is not null; The output is a clean table listing out all foreign keys from all databases +-----------------------+-------------+ |... Read More »

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Create foreign key using Phpmyadmin

Silver Moon — Tue, 25 Aug 2009 12:03:01 +0000

The innodb storage engine supports foreign keys in Mysql. To create foreign keys in phpmyadmin : 1. Convert both tables into innodb, if they are not already. 2. View the structure of the table which will have a foreign key. Make the referencing field an INDEX. 3. Now come back to structure view and click... Read More »

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Import mysql dump files with view definer and sql security

Silver Moon — Sat, 22 Aug 2009 11:08:58 +0000

Views and mysqldump A little back I tried to backup a database from my webhost and restore it on my localhost mysql. It had a few views. The import of the sql file seemed to work fine. But on accessing the views in phpmyadmin mysql gave the error : #1449 - There is no 'projects'@'localhost'... Read More »

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Restore Mysql Database from a sql or zip file using PHP

Silver Moon — Fri, 01 May 2009 06:40:00 +0000

In a previous post we learnt how to inside php. In this example the same zip file would be used to restore the database. Code // Function to restore from a file function restore($path) { $f = fopen('restore/temp.sql' , 'w+'); if(!$f) { echo "Error While Restoring Database"; return; } $zip = new ZipArchive(); if ($zip->open($path)... Read More »

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Backup mysql database with php and zip it

Silver Moon — Fri, 01 May 2009 06:29:00 +0000

Many php applications prefer to backup the mysql database from within the application and save it as an archive. The mysqldump commandline utility can be used to perform this function of backing up a mysql database as sql file. The command would be like this : mysqldump --user=$username --password=$password --opt $db_name > $dir/backup.sql The above... Read More »

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