Php oci new descriptor () function

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(PHP 5)

oci_new_descriptor -- Initializes a new empty LOB or FILE descriptor

Syntax

OCI-Lob oci_new_descriptor ( resource connection [, int type] )

oci_new_descriptor() allocates resources to hold descriptor or LOB locator. Valid values for type are: OCI_D_FILE, OCI_D_LOB and OCI_D_ROWID.

Example 1. oci_new_descriptor() example


<?php   
    /* This script is designed to be called from a HTML form.
     * It expects $user, $password, $table, $where, and $commitsize
     * to be passed in from the form.  The script then deletes
     * the selected rows using the ROWID and commits after each
     * set of $commitsize rows. (Use with care, there is no rollback)
     */
    $conn = oci_connect($user, $password);
    $stmt = oci_parse($conn, "select rowid from $table $where");
    $rowid = oci_new_descriptor($conn, OCI_D_ROWID);
    oci_define_by_name($stmt, "ROWID", $rowid);   
    oci_execute($stmt);
    while (oci_fetch($stmt)) {
       $nrows = oci_num_rows($stmt);
       $delete = oci_parse($conn, "delete from $table where ROWID = :rid");
       oci_bind_by_name($delete, ":rid", $rowid, -1, OCI_B_ROWID);
       oci_execute($delete);      
       echo "$nrows\n";
       if (($nrows % $commitsize) == 0) {
           oci_commit($conn);      
       }   
    }
    $nrows = oci_num_rows($stmt);   
    echo "$nrows deleted...\n";
    oci_free_statement($stmt);  
    oci_close($conn);
?>


<?php
    /* This script demonstrates file upload to LOB columns
     * The formfield used for this example looks like this
     * <form action="upload.php" method="post" enctype="multipart/form-data">
     * <input type="file" name="lob_upload" />
     * ...
     */
  if (!isset($lob_upload) || $lob_upload == 'none'){
?>
<form action="upload.php" method="post" enctype="multipart/form-data">
Upload file: <input type="file" name="lob_upload" /><br />
<input type="submit" value="Upload" /> - <input type="reset" value="Reset" />
</form>
<?php
  } else {

     // $lob_upload contains the temporary filename of the uploaded file

     // see also the features section on file upload,
     // if you would like to use secure uploads
     
     $conn = oci_connect($user, $password);
     $lob = oci_new_descriptor($conn, OCI_D_LOB);
     $stmt = oci_parse($conn, "insert into $table (id, the_blob) 
               values(my_seq.NEXTVAL, EMPTY_BLOB()) returning the_blob into :the_blob");
     oci_bind_by_name($stmt, ':the_blob', $lob, -1, OCI_B_BLOB);
     oci_execute($stmt, OCI_DEFAULT);
     if ($lob->savefile($lob_upload)){
        oci_commit($conn);
        echo "Blob successfully uploaded\n";
     }else{
        echo "Couldn't upload Blob\n";
     }
     oci_free_descriptor($lob);
     oci_free_statement($stmt);
     oci_close($conn);
  }
?>

Example 2. oci_new_descriptor() example


<?php   
    /* Calling PL/SQL stored procedures which contain clobs as input
     * parameters (PHP 4 >= 4.0.6). 
     * Example PL/SQL stored procedure signature is:
     *
     * PROCEDURE save_data
     *   Argument Name                  Type                    In/Out Default?
     *   ------------------------------ ----------------------- ------ --------
     *   KEY                            NUMBER(38)              IN
     *   DATA                           CLOB                    IN
     *
     */

    $conn = oci_connect($user, $password);
    $stmt = oci_parse($conn, "begin save_data(:key, :data); end;");
    $clob = oci_new_descriptor($conn, OCI_D_LOB);
    oci_bind_by_name($stmt, ':key', $key);
    oci_bind_by_name($stmt, ':data', $clob, -1, OCI_B_CLOB);
    $clob->write($data);
    oci_execute($stmt, OCI_DEFAULT);
    oci_commit($conn);
    $clob->free();
    oci_free_statement($stmt);
?>

oci_new_descriptor() returns FALSE on error.

Note: In PHP versions before 5.0.0 you must use ocinewdescriptor() instead. This name still can be used, it was left as alias of oci_new_descriptor() for downwards compatability. This, however, is deprecated and not recommended.

Php oci new descriptor Function syntax tag

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Php oci new descriptor syntax tutorial

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