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This document uses PHP Chinese website manual Release
(PHP 4 >= 4.2.0, PHP 5, PHP 7)
fbsql_read_blob — Read a BLOB from the database
$blob_handle
[, resource $link_identifier
] )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.
blob_handle
A BLOB handle, returned by fbsql_create_blob() .
link_identifier
由 fbsql_connect() 或 fbsql_pconnect() 返回的 FrontBase 链接标识符.
如可选并未指定,函数会尝试查找一个到 FrontBase 服务器的开放链接,且如没有找到这样的链接,会尝试通过不带参数调用 fbsql_connect() 来创建一个。
Returns a string containing the specified BLOB data.
Example #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 );
?>