Condition-driven INSERT and UPDATE in a single query - php

Question

I have a MySQL table with the following fields:
ID
PHONE
NAME
CITY
COUNTRY
Using PHP, I am reading a comma separated dump of values off a text document, parsing the values and inserting records to the table. For reference, here's the code:
<?php
// Includes
require_once 'PROJdbconn.php';
// Read comma-separated text file
$arrindx = 0;
$i = 0;
$filehandle = fopen(PROJCDUMPPATH.PROJCDUMPNAME,"rb");
while (!feof($filehandle)){
$parts = explode(',', fgets($filehandle));
$contnames[$arrindx] = $parts['0'];
$contnumbers[$arrindx] = preg_replace('/[^0-9]/','',$parts['1']);
$arrindx += 1;
}
fclose($filehandle);
$arrindx -= 1;
$filehandle = NULL;
$parts = NULL;
// Build SQL query
$sql = "INSERT INTO Contact_table (PHONE, NAME) VALUES ";
for ($i = 0; $i < $arrindx; ++$i){
$sql .= "('".$contnumbers[$i]."', '".$contnames[$i]."'),";
}
$i = NULL;
$arrindx = NULL;
$contnames = NULL;
$contnumbers = NULL;
$sql = substr($sql,0,strlen($sql)-1).";";
// Connect to MySQL database
$connect = dbconn(PROJHOST,PROJDB,PROJDBUSER,PROJDBPWD);
// Execute SQL query
$query = $connect->query($sql);
$sql = NULL;
$query = NULL;
// Close connection to MySQL database
$connect = NULL;
?>
Now, this code, as you can see, blindly dumps all records into the table. However, I need to modify the code logic as such:
Read text file and parse records into arrays (already doing)
For each record in text file
Check if PHONE exists in the table
If yes,
For each field in the text file record
If text file field != NULL
Update corresponding field in table
Else
Skip
If no,
INSERT record (already doing)
I apologize if the logic isn't terribly clear, feel free to ask me if any aspect confuses you. So, I understand this logic would involve an insane number of SELECT, UPDATE, and INSERT queries, depending on the number of fields (I intend to add more fields in future) and records. Is there any way to either somehow morph them into a single query or leastwise optimize the code by minimizing the number of queries?

Answer 1

What you're trying to do is called an "upsert" (update/insert).
MySQL INSERT else if exists UPDATE