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michael dot virnstein at brodos dot de ¶
17 years ago
A neat way to parse a query only once per script, if the query is done inside a function:



<?php

function querySomething($conn, $id)

{

    static $stmt;



    if (is_null($stmt)) {

        $stmt = oci_parse($conn, 'select * from t where pk = :id');

    }



    oci_bind_by_name($stmt, ':id', $id, -1);



    oci_execute($stmt, OCI_DEFAULT);



    return oci_fetch_array($stmt, OCI_ASSOC);



}



?>



With the static variable, the statment handle isn't closed after the function has terminated. Very nice for functions that are called e.g. in loops. Unfortunately this only works for static sql. If you have dynamic sql, you can do the following:



<?php



function querySomething($conn, $data)

{

    static $stmt = array();

    

    $first = true;

    

    $query = 'select * from t';



    foreach ($data as $key => $value) {

        if ($first) {

            $first = false;

            $query .= ' where ';

        } else {

            $query .= ' and ';

        }

        

        $query .= "$key = :b$key";

    }

    

    $queryhash = md5($query);

   

    if (is_null($stmt[$queryhash])) {

        $stmt[$queryhash] = oci_parse($conn, $query);    

    }



    foreach ($data as $key => $value) {

        // don't use $value, because we bind memory addresses here.

        // this would result in every bind pointing at the same value after foreach

        oci_bind_by_name($stmt[$queryhash], ":b$key", $data[$key], -1);

    }

    

    oci_execute($stmt[$queryhash], OCI_DEFAULT);



    return oci_fetch_array($stmt[$queryhash], OCI_ASSOC);



}



?>
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