Updating mysql db ONLY when new data

[j5uh]

I have a script here that I am using to extract the data from a .csv file to upload to a mysql db. It work's really well but I only want it to update whenever it has a new file or new data. So basically I wouldn't mind if the script ran and attempt to update, but if all fields match I want it to cancel the update. Here is my code:

 

<?

/********************************************************************************************/
/* Code at http://legend.ws/blog/tips-tricks/csv-php-mysql-import/
/* Edit the entries below to reflect the appropriate values
/********************************************************************************************/
$databasehost = "xx";
$databasename = "xx";
$databasetable = "xx";
$databaseusername ="xx";
$databasepassword = "xx";
$fieldseparator = ";";
$lineseparator = "\n";
$csvfile = "file.csv";
/********************************************************************************************/
/* Would you like to add an ampty field at the beginning of these records?
/* This is useful if you have a table with the first field being an auto_increment integer
/* and the csv file does not have such as empty field before the records.
/* Set 1 for yes and 0 for no. ATTENTION: don't set to 1 if you are not sure.
/* This can dump data in the wrong fields if this extra field does not exist in the table
/********************************************************************************************/
$addauto = 1;
/********************************************************************************************/
/* Would you like to save the mysql queries in a file? If yes set $save to 1.
/* Permission on the file should be set to 777. Either upload a sample file through ftp and
/* change the permissions, or execute at the prompt: touch output.sql && chmod 777 output.sql
/********************************************************************************************/
$save = 0;
$outputfile = "output.sql";
/********************************************************************************************/


if(!file_exists($csvfile)) {
echo "File not found. Make sure you specified the correct path.\n";
exit;
}

$file = fopen($csvfile,"r");

if(!$file) {
echo "Error opening data file.\n";
exit;
}

$size = filesize($csvfile);

if(!$size) {
echo "File is empty.\n";
exit;
}

$csvcontent = fread($file,$size);

fclose($file);

$con = @mysql_connect($databasehost,$databaseusername,$databasepassword) or die(mysql_error());
@mysql_select_db($databasename) or die(mysql_error());

$lines = 0;
$queries = "";
$linearray = array();

foreach(split($lineseparator,$csvcontent) as $line) {

$lines++;

$line = trim($line," \t");

$line = str_replace("\r","",$line);

/************************************************************************************************************
This line escapes the special character. remove it if entries are already escaped in the csv file
************************************************************************************************************/
$line = str_replace("'","\'",$line);
/***********************************************************************************************************/

$linearray = explode($fieldseparator,$line);

$linemysql = implode("','",$linearray);

if($addauto)
	$query = "insert into $databasetable values('month','$linemysql');";
else
	$query = "insert into $databasetable values('$linemysql');";

$queries .= $query . "\n";

@mysql_query($query);
}

@mysql_close($con);

if($save) {

if(!is_writable($outputfile)) {
	echo "File is not writable, check permissions.\n";
}

else {
	$file2 = fopen($outputfile,"w");

	if(!$file2) {
		echo "Error writing to the output file.\n";
	}
	else {
		fwrite($file2,$queries);
		fclose($file2);
	}
}

}

echo "Found a total of $lines records in this csv file.\n";


?>

[Rohan Shenoy]

Use the filemtime() function to get last modified time of the CSV file. If it is later than the one previously checked, update the DB.