fbsql_read

说明

string fbsql_read_blob ( string blob_handle [, resource link_identifier] )

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.

例子 1. 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);
    
?>