Database class - Table exists? - php

Question

I am using the following awesome, easy & lightweight database class: https://codeshack.io/super-fast-php-mysql-database-class/
My problem is I do not know how I can figure out if a table in the database exists or not. I have the following PHP Code:
function addSts($database, $brow, $vers, $pag, $lang) {
$tablename = "sts" . $pag;
$stsinsert = $database->query('INSERT INTO ' . $tablename . '(id, browser, version, language, date) VALUES (NULL, ?, ?, ?, current_timestamp())', $brow, $vers, $lang);
if ($stsinsert->affectedRows()) {
echo "TABLE EXISTS";
$database->close();
}
else {
echo "TABLE DOES NOT EXISTS -> CREATE TABLE";
$pagecreation = $database->query('CREATE TABLE ' . $tablename . ' (`id` BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT, `browser` VARCHAR(20) NOT NULL, `version` VARCHAR(10) NOT NULL, `language` VARCHAR(5) NOT NULL, `date` TIMESTAMP NOT NULL DEFAULT CURRENT_DATE(), PRIMARY KEY (`id`))');
if ($pagecreation) {
addSts($brow, $vers, $pag, $lang);
}
}
}
It always throws the following error: Unable to prepare MySQL statement (check your syntax) - Table 'testdb.ststest' doesn't exist
So and here we have the salad. It throws the error and does not go further to the if-else part. SO every time the table does not exist the program stops working.
Hope somebody can help me out.
Thanks in advance.

Answer 1

If you can, use the information_schema DB and query TABLES tables
select * from tables where TABLE_SCHEMA like '<database name>'
e.g. select * from tables where TABLE_SCHEMA like 'mydbdev'
the simply iterate through the results OR
select * from tables where TABLE_SCHEMA like '<database name>' AND TABLE_NAME like '<table name>';
and count the rows (should be 0 if not present or 1 if it is).

Answer 2

As #Barmar mentioned in the comments, you can use try/catch statements to do this.
function addSts($database, $brow, $vers, $pag, $lang) {
$tablename = "sts" . $pag;
try {
// try to insert first
$stsinsert = $database->query('INSERT INTO ' . $tablename . '(id, browser, version, language, date) VALUES (NULL, ?, ?, ?, current_timestamp())', $brow, $vers, $lang);
if ($stsinsert->affectedRows()) {
echo "TABLE EXISTS";
$database->close();
}
}
catch (\Exception $e){
echo "TABLE DOES NOT EXISTS -> CREATE TABLE";
$pagecreation = $database->query('CREATE TABLE ' . $tablename . ' (`id` BIGINT(20) UNSIGNED NOT NULL AUTO_INCREMENT, `browser` VARCHAR(20) NOT NULL, `version` VARCHAR(10) NOT NULL, `language` VARCHAR(5) NOT NULL, `date` TIMESTAMP NOT NULL DEFAULT CURRENT_DATE(), PRIMARY KEY (`id`))');
if ($pagecreation) {
// call the function to insert data
addSts($brow, $vers, $pag, $lang);
}
}
}