如何在PHP中多次漫游SQL查询

Question

A friend of mine has asked me a question which i do not know how.

The problem is he wants to use a result set of a query more than one time. Whenever he wants.

There is example tables and example output attached.

I will query two times only:

Select * from ornek1_ust
Select * from ornek1_alt

Is it possible to roam in a result set we already have with PHP to have some output like example output. I want to query database with full data for once. Then i want to use it wherever i want whenever i want.

Example Tables:

Example Output:

Answer 1

It sounds like you want to be using mysql_result() to be able to pull out data from a resultset at will.

If you want to loop through the whole dataset and still have it available to loop through again, you can use mysql_data_seek() to set the internal pointer back to the beginning.

Answer 2

Just store the query results in an array....

$sql = "Select * from ornek1_ust";
$results = array();
$query = mysql_query($sql);
while ($row = mysql_fetch_array($query, MYSQL_ASSOC)) {
    $results[] = $row;
}

// Use $results further on in your code

Answer 3

You'd want to "cache" the results within PHP. To fetch the data, you'd do a simple join query:

SELECT ornek_ust1.isim AS ust, ornek1_alt.ism AS alt
FROM ornek_ust1
JOIN ornek1_alt ON ornek_ust1.id = ornek1_alt.ust_ID
ORDER BY ornek_ust1.isim, ornek1_alt.ism

and within PHP, do something like:

$data = array();

$sql = "SELECT ...";
$res = mysql_query($sql) or die(mysql_error());

while($row = mysql_fetch_assoc($res)) {
   $data[$row['ust'][] = $row['alt'];
}

which will build an array that looks like your desired data:

$data = array(
    'ust data1' => array(
           0 => 'alt data 1'
           1 => 'alt data 2'
    ),
    'ust_data2' => ... etc...
)