What is the best way to: check if an entry exists, if it doesn't create it, if it does update it?
1238
mysql_fetch_array()/mysql_fetch_assoc()/mysql_fetch_row()/mysql_num_rows etc... expects parameter 1 to be resource
4521
Is there an "exists" function for jQuery?
116764
How to deterministically verify that a JSON object hasn't been modified?
84131
Display error message if same record exist with combination of some fields?
67433
Insert data only if record does not exist
77455
Only inserting a row if it's not already there
73550
Checking if a URL exists or not
134025
How to check if an array value exists?
5357
Word meaning both create and update?
25703
Best way to test for a variable's existence in PHP; isset() is clearly broken
74697
How to check if mysql database exists
29224
How do I force Windows to check for updates?
9687
Fastest way to determine if record exists
117749
How to see any changes (new row) in mongoDB?
93916
form not creating new entries
91447
Check if a method exists
135734
How to add column if not exists on PostgreSQL?