How to fetch single row/data from Mysql_fetch_array? - mysql

Question

I am reading .csv file through PHP using fgetcsv(). Now I am able to fetch I mean read data from .csv file.
Then I need to check SKU column with my fetch result & accordingly have to perform either Insertion Or Updation.
Suppose SKU is already present there, then I have to update my row in table else I need to insert new record.
I have write following code...Plz check n tell me where I am doing mistake-:
<?php
$row = 1;
if (($handle = fopen("localhost/data/htdocs/magento/var/import/Price.csv", "r")) !== FALSE)
{
while (($data = fgetcsv($handle, 8000, ",")) !== FALSE)
{
$num = count($data);
echo "<p> $num fields in line $row: <br /></p>\n";
for ($c=0; $c < $num; $c++)
{
$temp = $data;
$string = implode(";", $temp);
}
$pieces = explode(";", $string);
$col1 = $pieces[0];
$col2 = $pieces[1];
$col3 = $pieces[2];
$col4 = $pieces[3];
$db_name = "magento";
$con = mysql_connect("localhost", "magento", "password");
If (!$con)
{
die('Could not connect: ' . mysql_error());
mysql_close($con);
}
$seldb = mysql_select_db($db_name, $con);
$query_fetch = "SELECT `sku` from `imoprt_prices`";
$result_fetch = mysql_query($query_fetch);
$num_rows = mysql_num_rows($result_fetch);
for($i = 0; $i < $num_rows; $i++)
{
$value = mysql_result($result_fetch, i, 'sku');
if(strcmp('".$value."', '".$col2."') == 0)
{
$flag = 1;
break;
}
else
{
$flag = 0;
break;
}
}
if($flag == 1)
{
$query_upadte = "(UPDATE imoprt_prices SET customer_id= '".$col1."', sku ='".$col2."', price= '".$col3."', website= '".$col4."'
)";
mysql_query($query_upadte);
$row++;
}
if($flag == 0)
{
mysql_query("INSERT INTO `imoprt_prices`(`customer_id`,`sku`,`price`,`website`) VALUES('".$col1."','".$col2."','".$col3."','".$col4."')");
$row++;
}
}
}
?>

Answer 1

If you have an actual UNIQUE index on your imoprt_prices table, you can use the ON DUPLICATE KEY UPDATE syntax and simplify your code a bit to something similar to; (note, can't test, so see as pseudo code)
$db_name = "magento";
$con = mysql_connect("localhost", "magento", "password") or die(mysql_error());
$seldb = mysql_select_db($db_name, $con);
if (($handle = fopen("localhost/data/htdocs/magento/var/import/Price.csv", "r")) !== FALSE)
{
while (($data = fgetcsv($handle, 8000, ",")) !== FALSE)
{
$col1 = $pieces[0];
$col2 = $pieces[1];
$col3 = $pieces[2];
$col4 = $pieces[3];
$query_upadte = "INSERT INTO imoprt_prices (customer_id, sku, price, website) ".
"VALUES('".$col1."','".$col2."','".$col3."','".$col4."') ".
"ON DUPLICATE KEY UPDATE customer_id='".$col1."', price='".$col3.
"',website='".$col4."'";
mysql_query($query_upadte);
}
}
You may also want to either mysql_real_escape_string() or use parameterized queries to make sure there's no ' in your inserted values though. That is always a danger with building sql strings like this.
Simple demo here.

Answer 2

In the following snippet:
$query_upadte = "UPDATE imoprt_prices SET customer_id= '".$col1."', sku ='".$col2."', price= '".$col3."', website= '".$col4."'";
You're trying to update all the rows repeatedly, instead of just updating a single row. This is normally not allowed in MySQL. You need to specify a particular unique ID to be updated.