Php/docs/function.cubrid-lob2-read
cubrid_lob2_read
(PECL CUBRID >= 8.4.1)
cubrid_lob2_read — Read from BLOB/CLOB data
说明
cubrid_lob2_read
( resource $lob_identifier
, int $len
) : string
The cubrid_lob2_read() function reads len bytes from the
LOB data and returns the bytes read.
参数
lob_identifier- Lob identifier as a result of cubrid_lob2_new() or get from the result set.
len- Length from buffer you want to read from the lob data.
返回值
Returns the contents as a string.
false when there is no more data.
NULL on failure.
范例
Example #1 cubrid_lob2_read() example 1
<?php// test_lob (id INT, contents CLOB)$conn = cubrid_connect("localhost", 33000, "demodb", "public", "");$req = cubrid_execute($conn, "select * from test_lob");$row = cubrid_fetch_row($req, CUBRID_LOB);print "position now is " . cubrid_lob2_tell($row[1]) . "\n";cubrid_lob2_seek($row[1], 10, CUBRID_CURSOR_FIRST);print "\nposition after moving farword is " . cubrid_lob2_tell($row[1]) . "\n";$data = cubrid_lob2_read($row[1], 12);print "\nposition after reading is " . cubrid_lob2_tell($row[1]) . "\n";print $data . "\n";cubrid_lob2_seek($row[1], 5, CUBRID_CURSOR_CURRENT);print "\nposition after moving again is " . cubrid_lob2_tell($row[1]) . "\n";$data = cubrid_lob2_read($row[1], 20);print $data . "\n";cubrid_disconnect($conn);?>
Example #2 cubrid_lob2_read() example 2
<?php// test_lob (id INT, contents CLOB)$conn = cubrid_connect("localhost", 33000, "demodb", "dba", "");$req = cubrid_execute($conn, "select * from test_lob");$row = cubrid_fetch_row($req, CUBRID_LOB);while (true) { if ($data = cubrid_lob2_read($row[1], 1024)) { print $data . "\n"; } elseif ($data === false) { print "There is no more data\n"; break; } else { print "There must some errors\n"; break; }}cubrid_disconnect($conn);?>
参见
- cubrid_lob2_write() - Write to a lob object
- cubrid_lob2_seek() - Move the cursor of a lob object
- cubrid_lob2_seek64() - Move the cursor of a lob object
- cubrid_lob2_tell() - Tell the cursor position of the LOB object
- cubrid_lob2_tell64() - Tell the cursor position of the LOB object
- cubrid_lob2_size() - Get a lob object's size
- cubrid_lob2_size64() - Get a lob object's size
