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    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.

    示例

    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

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