Php/docs/function.fbsql-read-clob
fbsql_read_clob
(PHP 4 >= 4.2.0, PHP 5 < 5.3.0)
fbsql_read_clob — Read a CLOB from the database
说明
fbsql_read_clob
( string $clob_handle
[, resource $link_identifier
] ) : string
Reads CLOB data from the database.
If a select statement contains BLOB and/or CLOB columns FrontBase will return the data directly when data is fetched. This default behavior can be changed with fbsql_set_lob_mode() so the fetch functions will return handles to BLOB and CLOB data. If a handle is fetched a user must call fbsql_read_clob() to get the actual CLOB data from the database.
参数
clob_handleA CLOB handle, returned by fbsql_create_clob().
link_identifier由 fbsql_connect() 或 fbsql_pconnect() 返回的 FrontBase 链接标识符.
如可选并未指定，函数会尝试查找一个到 FrontBase 服务器的开放链接，且如没有找到这样的链接，会尝试通过不带参数调用 fbsql_connect() 来创建一个。
返回值
Returns a string containing the specified CLOB data.
范例
Example #1 fbsql_read_clob() example
<?php$link = fbsql_pconnect("localhost", "_SYSTEM", "secret") or die("Could not connect");$sql = "SELECT CLOB_COLUMN FROM CLOB_TABLE;";$rs = fbsql_query($sql, $link);$row_data = fbsql_fetch_row($rs);// $row_data[0] will now contain the clob data for the first rowfbsql_free_result($rs);$rs = fbsql_query($sql, $link);fbsql_set_lob_mode($rs, FBSQL_LOB_HANDLE);$row_data = fbsql_fetch_row($rs);// $row_data[0] will now contain a handle to the CLOB data in the first row$clob_data = fbsql_read_clob($row_data[0]);fbsql_free_result($rs);?>
参见
- fbsql_create_clob() - Create a CLOB
- fbsql_read_blob() - Read a BLOB from the database
- fbsql_set_lob_mode() - Set the LOB retrieve mode for a FrontBase result set
