function to delete older sqlite records when the limit is reached
I had an issue where a sqlite database was hitting over 100,000 records and this was causing quite a lot of lag and crashing on my server, the number of records was not really meant to be this high, so i can just keep a few thousand so it does not cause lag.
This is the function i added and run before or after the latest item is inserted to remove older items in the database.
PHP
// this will delete records over the specified number if run.
// it will keep the latest $records_to_keep number and delete older ones.
public function delete_over($records_to_keep = 1000) {
$db_table_name = $this->db_table_name;
$sql = "DELETE FROM $db_table_name WHERE ROWID IN (SELECT ROWID FROM $db_table_name ORDER BY ROWID DESC LIMIT -1 OFFSET $records_to_keep)";
$result = $this->db->query($sql);
}
// example run on keywords class
$keywords->delete_over($records_to_keep = 1000);External Link for function to delete older sqlite records when the limit is reached
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"Olivia, my eldest daughter, caught measles when she was seven years old. As the illness took its usual course I can remember reading to her often in bed and not feeling particularly alarmed about it. Then one morning, when she was well on the road to recovery, I was sitting on her bed showing her how to fashion little animals out of coloured pipe-cleaners, and when it came to her turn to make one herself, I noticed that her fingers and her mind were not working together and she couldn’t do anything. 'Are you feeling all right?' I asked her. 'I feel all sleepy,' she said. In an hour, she was unconscious. In twelve hours she was dead. The measles had turned into a terrible thing called measles encephalitis and there was nothing the doctors could do to save her. That was...in 1962, but even now, if a child with measles happens to develop the same deadly reaction from measles as Olivia did, there would still be nothing the doctors could do to help her. On the other hand, there is today something that parents can do to make sure that this sort of tragedy does not happen to a child of theirs. They can insist that their child is immunised against measles. ...I dedicated two of my books to Olivia, the first was ‘James and the Giant Peach’. That was when she was still alive. The second was ‘The BFG’, dedicated to her memory after she had died from measles. You will see her name at the beginning of each of these books. And I know how happy she would be if only she could know that her death had helped to save a good deal of illness and death among other children."
I just checked google books for BFG, and the dedication is there.
https://www.google.com.au/books/edition/_/quybcXrFhCIC?hl=en&gbpv=1
Roald Dahl, 1986