Edit report at http://bugs.php.net/bug.php?id=54508&edit=1
ID: 54508 Comment by: anthon dot pang at gmail dot com Reported by: anthon dot pang at gmail dot com Summary: mysqli: truncated floats Status: Bogus Type: Bug Package: MySQLi related Operating System: Linux PHP Version: 5.3.6 Block user comment: N Private report: N New Comment: Thank you very much for the explanation. Previous Comments: ------------------------------------------------------------------------ [2011-04-13 11:53:11] johan...@php.net Thank you for taking the time to write to us, but this is not a bug. Please double-check the documentation available at http://www.php.net/manual/ and the instructions on how to report a bug at http://bugs.php.net/how-to-report.php PDO is using emulation of prepared statements by default. By such it is executing a regular "query" command which uses the MySQL "text" protocol. When using prepared statements with mysqli it is using true prepared statements and they are using the binary protocol for talking to the MySQL server. This means data is received in different formats and by such is interpreteded differently. ------------------------------------------------------------------------ [2011-04-11 19:07:59] anthon dot pang at gmail dot com Description: ------------ There's an inconsistency in behaviour between mysqli and PDO_MSYQL in the following SELECT, e.g., SELECT TRUNCATE(SUM(aFloatColumn),2) FROM aTable; Let's say the sum of the column is 42.001. With PDO_MYSQL, you'll get "42.00". But with MYSQLI, you'll instead get "42". Test script: --------------- <?php $link = mysqli_connect("localhost", "user", "password", "dbname"); $query = 'CREATE TABLE t (f FLOAT)'; $stmt = mysqli_prepare($link, $query); mysqli_stmt_execute($stmt); $query = 'TRUNCATE TABLE t'; $stmt = mysqli_prepare($link, $query); mysqli_stmt_execute($stmt); $query = 'INSERT INTO t (f) VALUES (42.001)'; $stmt = mysqli_prepare($link, $query); mysqli_stmt_execute($stmt); $query = "SELECT truncate(sum(f), 2) from t"; $stmt = mysqli_prepare($link, $query); mysqli_stmt_execute($stmt); mysqli_stmt_bind_result($stmt, $revenue); while (mysqli_stmt_fetch($stmt)) { printf ("%s\n", $revenue); } mysqli_stmt_close($stmt); mysqli_close($link); Expected result: ---------------- 42.00 Actual result: -------------- 42 ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/bug.php?id=54508&edit=1
