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As part of debugging a bit of code I needed to know the longest possible field lengths that a record contains. You might need to know this if you are performing a database migration. The following query returns a field, along with the length of the string, and orders the results by the number of characters in that string.
SELECT field, CHARACTER_LENGTH(field) as fieldCharacterCount
FROM table
ORDER BY fieldCharacterCount DESC
I needed to create a query that did a case insensitive search using the LIKE command in MySQL and I quickly realised that in order to do this I would need to alter both the parameter and the table data to be the same case. This can be done by using the MySQL UPPER() command on the table data and the strtoupper() PHP function on the input data.
Connecting to a MySQL database in PHP is usually not a difficult thing to do, in fact it is one of the first things that many tutorials will go though. However, there are certain curcumstances that require more information than the standard host, password and username details.
Today I needed to grab some data from a table where there was more than one occurrence of a string within another string. Basically, I needed to find all URL's from a table that were more than 3 levels deep (i.e. with 3 slashes), but realised there wasn't a function to do this in MySQL.
There are quite a few scripts available on the Internet that allow you to dump data from a database into a format that can be used to replicate that database structure elsewhere. The following function is my take on this commonly occurring script.
I use my PC for a lot of different things, and I don't necessarily need to have MySQL server running all the time, especially when I want to play a game. So I wondered if there was a simple way in which I could start and stop the server using a simple .bat file.
