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, or null on failure.

范例

示例 #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);
?>

示例 #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

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官方地址：https://www.php.net/manual/en/function.cubrid-lob2-read.php

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cubrid_lob2_read

说明

参数

返回值

范例

参见

User Contributed Notes