Insert result from DOMXpath into MySQL - php

Question

Im using this DOMXpath query to retrieve some columns from another page.
$html = file_get_contents("http://localhost:8888/stockPrices.php");
libxml_use_internal_errors(true);
$doc = new \DOMDocument();
if($doc->loadHTML($html))
{
$result = new \DOMDocument();
$result->formatOutput = true;
$table = $result->appendChild($result->createElement("table"));
$thead = $table->appendChild($result->createElement("thead"));
$tbody = $table->appendChild($result->createElement("tbody"));
$table->setAttribute('class', 'table table-hover');
$xpath = new \DOMXPath($doc);
$newRow = $thead->appendChild($result->createElement("tr"));
foreach($xpath->query("//table[#id='kurstabell']/thead/tr/th[position()=2 or position()=3 or position()=8 or position()=9 or position()=10]") as $header)
{
$newRow->appendChild($result->createElement("th", trim($header->nodeValue)));
}
foreach($xpath->query("//table[#id='kurstabell']/tbody/tr") as $row)
{
$newRow = $tbody->appendChild($result->createElement("tr"));
foreach($xpath->query("./td[position()=2 or position()=3 or position()=8 or position()=9 or position()=10]", $row) as $cell)
{
$newRow->appendChild($result->createElement("td", trim(htmlentities($cell->nodeValue))));
}
}
echo $result->saveXML($result->documentElement);
}
This generates four columns, aktier, senaste, högst, lägst and omsatt. But i dont know how to insert this to a MySQL table. Im thinking to first generate a array of the result, like:
Array
(
[1] => stdClass Object
(
[aktie] => AAK AB
[senaste] => 634,50
[högst] => 638,50
[lägst] => 622,50
[omsatt] => 32 094 048
)
[2] => stdClass Object
(
[aktie] => ABB Ltd
[senaste] => 162,80
[högst] => 163,30
[lägst] => 161,90
[omsatt] => 167 481 268
)
(you get the hang of it..)
)
According to this image:
And then loop the array into the table. Something like this?
$sql = "INSERT INTO stock_list (`aktie`, `senaste`, `högst`, `lägst`, `omsatt`, `timestamp`) VALUES
(:aktie, :senaste, :högst, :lägst, :omsatt)";
$query = $database->prepare($sql);
foreach($data as $stock){
$query->execute(array(':aktie' => $stock->stock,
':senaste' => $stock->prevclose,
':högst' => $stock->high,
':lägst' => $stock->low,
':omsatt' => $stock->volume
));
}
My question:
How do i populate the array with data?
How do i loop the result in a mysql query?

Answer 1

Don't know if this is a work around. But it is currently doing what I'm asking for.
// build query...
$sql = "INSERT INTO stocks";
// columns to insert into...
$sql .="(`name`, `closing`, `high`, `low`, `turn`, `timestamp`)";
// implode values of $array...
// notice array_chunk, this functions splits a big array into multi.
$str = NULL;
foreach (array_chunk($a, 5) as $row) {
$str .= '("'. implode('","',$row).'",NOW()),';
}
// Remove last ',' (comma) from string
// We added commas in the previous step
$str = rtrim($str,',');
$sql .= 'VALUES '. $str ;
// execute query...
$app = new Connection();
$query = $app->getConnection()->prepare($sql);
$query->execute();
if ($query->rowCount() <= 0) {
echo "Something went wrong.";
return false;
}
return true;

Answer 2

My guess is that what you really want is something along the lines of:
$query = 'INSERT INTO stock_list
(`aktie`, `senaste`, `högst`, `lägst`, `omsatt`, `timestamp`)
VALUES
(:aktie, :senaste, :högst, :lägst, :omsatt, NOW())';
$stmt = $app->getConnection()->prepare($query);
foreach ($data as $stock) {
$stmt->execute(
[
':aktie' => $stock->aktie,
':senaste' => $stock->senaste,
':högst' => $stock->{'högst'},
':lägst' => $stock->{'lägst'},
':omsatt' => $stock->omsatt,
]
);
$stmt->closeCursor();//might be required depending on DB driver, not for MySQL, though
}
Note that I call NOW() in the query string, and I don't bind that SQL function call to the parameters I execute the prepared statement with. All in all though, a timestamp field is best set by the DB itself (with a DEFAULT CURRENT_TIMESTAMP in the field definition). Then you can just leave the timestamp field out of your INSERT query, and it'll be set correctly for you.
I've also changed the way you're using the objects stock. From the var_dump I can see the properties aren't called stock, high, low and all that. The problem is, some of these property names (lägst for example) are a bit dodgy. You'll probably have to access those using a string, which can be done, like I did, by writing $objVar->{'property name as string'}.
If I were you, though, I'd look into ways of changing what $data actually looks like, and change the property names if at all possible.