插入和更新MySQL表

Question

I'm trying to put some code together that inserts data, whilst checking whether the data already exists into a mySQL table.

The data originates as an xml file which I've managed to extract and put into a PHP format but I'm struggling to get the 'Insert' and 'Checking' functionality working.

This is the code that I've got at the moment.

<? 

  $objDOM = new DOMDocument(); 
  $objDOM->load("xmlfile.xml"); 

  $Details = $objDOM->getElementsByTagName("Details"); 

  foreach( $Details as $value ) 
  { 

    $ListEntry = $value->getElementsByTagName("ListEntry"); 
    $listentry  = $ListEntry->item(0)->nodeValue;

    $SiteType = $value->getElementsByTagName("SiteType"); 
    $sitetype  = $SiteType->item(0)->nodeValue;

    $SiteDescription = $value->getElementsByTagName("SiteDescription"); 
    $sitedescription  = $SiteDescription->item(0)->nodeValue;

    $Siteosgb36lat = $value->getElementsByTagName("Siteosgb36lat"); 
    $siteosgb36lat  = $Siteosgb36lat->item(0)->nodeValue;

    $Siteosgb36lon = $value->getElementsByTagName("Siteosgb36lon"); 
    $siteosgb36lon  = $Siteosgb36lon->item(0)->nodeValue;


  } 

require("phpfile.php");

// Opens a connection to a MySQL server
$connection = mysql_connect ("hostname", $username, $password);
if (!$connection) {
  die('Not connected : ' . mysql_error());
}

// Set the active MySQL database
$db_selected = mysql_select_db($database, $connection);
if (!$db_selected) {
die ('Can\'t use db : ' . mysql_error());
}

mysql_query("INSERT INTO sitestable(listentry, sitetype, sitedescription, siteosgb36lat, siteosgb36lon) VALUES($listentry, $sitetype, $sitedescription, $siteosgb36lat, $siteosgb36lon ) ") 
or die(mysql_error());  

echo "Data Inserted!";

?>

I'd like the query to check to see whether there is an entry in the 'listentry' column that matches data in the file I'm wanting to add, if there is, then I want it to check all the fields for that record and update accordingly into my table.

Could someone perhaps take a look at this and let me know where I'm going wrong please.

Kind regards

UPDATED CODE

<? 

  $objDOM = new DOMDocument(); 
  $objDOM->load("xmlfile.xml"); 

  $Details = $objDOM->getElementsByTagName("Details"); 

  foreach( $Details as $value ) 
  { 

    $listentry = $value->getElementsByTagName("listentry"); 
    $listentrys  = $listentry->item(0)->nodeValue;

    $sitetype = $value->getElementsByTagName("sitetype"); 
    $sitetypes  = $sitetype->item(0)->nodeValue;

    $sitedescription = $value->getElementsByTagName("sitedescription"); 
    $sitedescriptions  = $sitedescription->item(0)->nodeValue;

    $siteosgb36lat = $value->getElementsByTagName("siteosgb36lat"); 
    $siteosgb36lats  = $siteosgb36lat->item(0)->nodeValue;

    $siteosgb36lon = $value->getElementsByTagName("siteosgb36lon"); 
    $siteosgb36lons  = $siteosgb36lon->item(0)->nodeValue;

    //echo "$listentrys :: $sitetypes :: $sitedescriptions :: $siteosgb36lats :: $siteosgb36lons <br>"; 


  } 

require("phpfile.php");

//Opens a connection to a MySQL server
$connection = mysql_connect ("hostname", $username, $password);
if (!$connection) {
 die('Not connected : ' . mysql_error());
}

// Set the active MySQL database
$db_selected = mysql_select_db($database, $connection);
if (!$db_selected) {
die ('Can\'t use db : ' . mysql_error());
}

mysql_query("INSERT IGNORE INTO sitestable (listentry, sitetype, sitedescription, siteosgb36lat, siteosgb36lon) VALUES('$listentrys','$sitetypes','$sitedescriptions','$siteosgb36lats','$siteosgb36lons') ")  
or die(mysql_error());  


echo "Data Inserted!"; 

?>

Answer 1

如果listentry属性是表的主键或已定义唯一索引，则可以使用INSERT ... ON DUPLICATE KEY UPDATE命令，有关更多详细信息，请参见http://dev.mysql.com/doc/refman /5.0/en/insert-on-duplicate.html 。

Answer 2

As mentioned earlier INSERT .. ON DUPLICATE KEY UPDATE is your best bet. For your particular query, it would look like this:

INSERT INTO sitetable
    (listentry, sitetype, sitedescription, siteosgb36lat, siteosgb36lon)
VALUES
    ($listentry, $sitetype, $sitedescription, $siteosgb36lat, $siteosgb36lon)
ON DUPLICATE KEY UPDATE
    listentry = VALUES(listentry),
    sitetype = VALUES(sitetype),
    sitedescription = VALUES(sitedescription),
    siteosgb36lat = VALUES(siteosgb36lat),
    siteosgb36lon = VALUES(siteosgb36lon);

This assumes you want to use all the new values, which is what it sounds like and that one of your new values is used in a UNIQUE column.

EDIT It should be noted that the query above includes your PHP variables.

UPDATE

You have a couple of problems here.

First, your plural variables (like listentrys ) are not actually arrays. Because of this, when you do your insert, you are only keeping the last value from the for loop.

Secondly, you can't insert an array into a query in the manner you are expecting. You need to loop each individual value.

My suggestion would be to use an array of arrays so that you can keep track of how many records you want and then loop your query statement.

foreach( $Details as $value ) 
{ 

  $listentry = $value->getElementsByTagName("listentry"); 
  $sitetype = $value->getElementsByTagName("sitetype"); 
  $sitedescription = $value->getElementsByTagName("sitedescription"); 
  $siteosgb36lat = $value->getElementsByTagName("siteosgb36lat"); 
  $siteosgb36lon = $value->getElementsByTagName("siteosgb36lon"); 

  $new_rows[] = array(
      'listentry' => $listentry->item(0)->nodeValue,
      'sitetype' => $sitetype->item(0)->nodeValue,
      'sitedescription' => $sitedescription->item(0)->nodeValue,
      'siteosgb36lat' => $siteosgb36lat->item(0)->nodeValue,
      'siteosgb36lon' => $siteosgb36lon->item(0)->nodeValue
  );

} 

//now loop your query
foreach ($new_rows as $row)
{
  $listentry = $row['listentry'];
  $sitetype = $row['sitetype'];
  $sitedescription = $row['sitedescription'];
  $siteosgb36lat = $row['siteosgb36lat'];
  $siteosgb36lon = $row['siteosgb36lon'];

  //Your query here
}

Answer 3

try this code

mysql_query("INSERT INTO sitestable(listentry, sitetype, sitedescription, siteosgb36lat, siteosgb36lon) VALUES('".$listentry."','".$sitetype."','".$sitedescription."','".$siteosgb36lat."','".$siteosgb36lon."') ") 
or die(mysql_error());

Answer 4

Have you checked out the Merge statement? Merge on Msdn