aci_new_descriptor

aci_new_descriptor — 初始化一个新的空 LOB 或 FILE 描述符

说明

aci_new_descriptor(resource $connection, int $type = ?): OCI-Lob

aci_new_descriptor() 分配资源以保存描述符或 LOB 定位器。有效的 type 值是：aci_D_FILE，aci_D_LOB 以及 aci_D_ROWID。

示例 #1 aci_new_descriptor() 例子

<?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 = aci_connect('sysdba', 'szoscar55', 'localhost:2003/OSRDB');
        $stmt = aci_parse($conn, "select rowid from $table $where");
        $rowid = aci_new_descriptor($conn, aci_D_ROWID);
        aci_define_by_name($stmt, "ROWID", $rowid);
        aci_execute($stmt);
        while (aci_fetch($stmt)) {
           $nrows = aci_num_rows($stmt);
           $delete = aci_parse($conn, "delete from $table where ROWID = :rid");
           aci_bind_by_name($delete, ":rid", $rowid, -1, aci_B_ROWID);
           aci_execute($delete);
           echo "$nrows\n";
           if (($nrows % $commitsize) == 0) {
                   aci_commit($conn);
           }
        }
        $nrows = aci_num_rows($stmt);
        echo "$nrows deleted...\n";
        aci_free_statement($stmt);
        aci_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

         $conn = aci_connect($user, $password);
         $lob = aci_new_descriptor($conn, aci_D_LOB);
         $stmt = aci_parse($conn, "insert into $table (id, the_blob)
                           values(my_seq.NEXTVAL, EMPTY_BLOB()) returning the_blob into :the_blob");
         aci_bind_by_name($stmt, ':the_blob', $lob, -1, aci_B_BLOB);
         aci_execute($stmt, aci_DEFAULT);
         if ($lob->savefile($lob_upload)){
                aci_commit($conn);
                echo "Blob successfully uploaded\n";
         }else{
                echo "Couldn't upload Blob\n";
         }
         aci_free_descriptor($lob);
         aci_free_statement($stmt);
         aci_close($conn);
  }
?>

示例 #2 aci_new_descriptor() 例子

<?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
         *
         */

        $conn = aci_connect($user, $password);
        $stmt = aci_parse($conn, "begin save_data(:key, :data); end;");
        $clob = aci_new_descriptor($conn, aci_D_LOB);
        aci_bind_by_name($stmt, ':key', $key);
        aci_bind_by_name($stmt, ':data', $clob, -1, aci_B_CLOB);
        $clob->write($data);
        aci_execute($stmt, aci_DEFAULT);
        aci_commit($conn);
        $clob->free();
        aci_free_statement($stmt);
?>

aci_new_descriptor() 如果出错返回 false。

注意:
在 PHP 5.0.0 之前的版本必须使用 acinewdescriptor() 替代本函数。该函数名仍然可用，
为向下兼容作为 aci_new_descriptor() 的别名。不过其已被废弃，不推荐使用。