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# OCINewDescriptor

OCINewDescriptor -- Initialize a new empty descriptor LOB/FILE (LOB is default)

## Description

`string OCINewDescriptor`(int connection, int [type]);

OCINewDescriptor() Allocates storage to hold descriptors or LOB locators. Valid values for the valid `type` are OCI_D_FILE, OCI_D_LOB, OCI_D_ROWID. For LOB desriptors, the methods load, save, and savefile are associated with the descriptor, for BFILE only the load method exists. See the second example usage hints.

Example 1. OCINewDescriptor

      1
      2 <?php
      3     /* This script is designed to be called from a HTML form.
      4      * It expects $user, $password, $table, $where, and $commitsize
      5      * to be passed in from the form.  The script then deletes
      6      * the selected rows using the ROWID and commits after each
      7      * set of $commitsize rows. (Use with care, there is no rollback)
      8      */
      9     $conn = OCILogon($user, $password);
     10     $stmt = OCIParse($conn,"select rowid from $table $where");
     11     $rowid = OCINewDescriptor($conn,OCI_D_ROWID);
     12     OCIDefineByName($stmt,"ROWID",&$rowid);
     13     OCIExecute($stmt);
     14     while ( OCIFetch($stmt) ) {
     15        $nrows = OCIRowCount($stmt);
     16        $delete = OCIParse($conn,"delete from $table where ROWID = :rid");
     17        OCIBindByName($delete,":rid",&$rowid,-1,OCI_B_ROWID);
     18        OCIExecute($delete);
     19        print "$nrows\n";
     20        if ( ($nrows % $commitsize) == 0 ) {
     21            OCICommit($conn);
     22        }
     23     }
     24     $nrows = OCIRowCount($stmt);
     25     print "$nrows deleted...\n";
     26     OCIFreeStatement($stmt);
     27     OCILogoff($conn);
     28 ?>
     29

      1
      2 <?php
      3     /* This script demonstrates file upload to LOB columns
      4      * The formfield used for this example looks like this
      5      * <form action="upload.php3" method="post" enctype="multipart/form-data">
      6      * <input type="file" name="lob_upload">
      7      * ...
      8      */
      9   if(!isset($lob_upload) || $lob_upload == 'none'){
     10 ?>
     11 <form action="upload.php3" method="post" enctype="multipart/form-data">
     12 Upload file: <input type="file" name="lob_upload"><br>
     13 <input type="submit" value="Upload"> - <input type="reset">
     14 </form>
     15 <?php
     16   } else {
     17      // $lob_upload contains the temporary filename of the uploaded file
     18      $conn = OCILogon($user, $password);
     19      $lob = OCINewDescriptor($conn, OCI_D_LOB);
     20      $stmt = OCIParse($conn,"insert into $table (id, the_blob) values(my_seq.NEXTVAL, EMPTY_BLOB()) returning the_blob into :the_blob");
     21      OCIBindByName($stmt, ':the_blob', &$lob, -1, OCI_B_BLOB);
     22      OCIExecute($stmt);
     23      if($lob->savefile($lob_upload)){
     24         OCICommit($conn);
     25         echo "Blob successfully uploaded\n";
     26      }else{
     27         echo "Couldn't upload Blob\n";
     28      }
     29      OCIFreeDescriptor($lob);
     30      OCIFreeStatement($stmt);
     31      OCILogoff($conn);
     32   }
     33 ?>
     34

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