fbsql_read_blob

Read a BLOB from the database (PHP 4 >= 4.2.0, PHP 5)
string fbsql_read_blob ( string blob_handle [, resource link_identifier ] )

说明

Returns: A string containing the BLOB specified by blob_handle.

fbsql_read_blob() reads BLOB data from the database. If a select statement contains BLOB and/or CLOB columns FrontBase will return the data directly when data is fetched. This default behavior can be changed with fbsql_set_lob_mode() so the fetch functions will return handles to BLOB and CLOB data. If a handle is fetched a user must call fbsql_read_blob() to get the actual BLOB data from the database.

例 623. fbsql_read_blob() example

<?php
   $link
= fbsql_pconnect("localhost", "_SYSTEM", "secret")
       or die(
"Could not connect");
   
$sql = "SELECT BLOB_COLUMN FROM BLOB_TABLE;";
   
$rs = fbsql_query($sql, $link);
   
$row_data = fbsql_fetch_row($rs);
   
// $row_data[0] will now contain the blob data for the first row
   
fbsql_free_result($rs);
   
   
$rs = fbsql_query($sql, $link);
   
fbsql_set_lob_mode($rs, FBSQL_LOB_HANDLE);
   
$row_data = fbsql_fetch_row($rs);
   
// $row_data[0] will now contain a handle to the BLOB data in the first row
   
$blob_data = fbsql_read_blob($row_data[0]);
   
fbsql_free_result($rs);
   
?>

See also: fbsql_create_blob(), fbsql_read_clob(), and fbsql_set_lob_mode().