How should necessary data that is stored in the database be referenced throughout code? Is it better to reference a numeric, auto-incrementing ID, or a unique alphanumeric key/name, etc.? For example:
- Determining page display based upon a specific setting/value from, say, a Settings database table
- Retrieving a maximum value stored in the database for displaying a list of items on a page
Is it a good practice to define constants in code to reference these things, such as the following? Or is there an entirely better approach?
/* Code to define constant references */ // Numeric, auto-incrementing ID? define('SETTING_A', 134); // Or unique name? define('SETTING_B', 'PageDisplaySetting'); /* Code to retrieve settings/values */ $ settingA = $ db->query('SELECT Value FROM Settings WHERE ID = ' . SETTING_A); $ settingB = $ db->query('SELECT DisplayMaxItems FROM Table WHERE ID = ' . SETTING_B); // etc. /* Code to render display based upon these settings/values */ ...
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