mysqli-multi-query

I have code, which is basically a copy of a php.net 's code, but for some reason it does not work. Here is the code on php.net: <?php $mysqli = new mysqli("localhost", "my_user", "my_password", "world"); /* check connection */ if (mysqli_connect_errno()) { printf("Connect failed: %s\n", mysqli_connect_error()); exit(); } $query = "SELECT CURRENT_USER();"; $query .= "SELECT Name FROM City ORDER BY ID LIMIT 20, 5"; /* execute multi query */ if ($mysqli->multi_query($query)) { do { /* store first result set */ if ($result = $mysqli->store_result()) { while ($row = $result->fetch_row()) { printf("

I am trying to convert MySQL to MySQLi. And I cannot figure out why it brakes on $stmt2->execute(); and returns error: Call to a member function execute() on a non-object Any issue or valid implementing of it!? // SQL condition "WHERE group=''" where `group` is empty (NULL) $result = "SELECT id, name FROM table WHERE group='' ORDER BY array ASC"; if ($stmt = $mysqli->prepare($result)) { $stmt->execute(); $stmt->bind_result($id, $name); while ($stmt->fetch()) { // SQL condition "WHERE group='$id'" where $id defined in $stmt->bind_result($id, $name); $result2 = "SELECT name FROM table WHERE

The Documentation of the Error Mentioned in the Title Says If you get Commands out of sync; you can't run this command now in your client code, you are calling client functions in the wrong order. This can happen, for example, if you are using mysql_use_result() and try to execute a new query before you have called mysql_free_result(). It can also happen if you try to execute two queries that return data without calling mysql_use_result() or mysql_store_result() in between. From here: http://dev.mysql.com/doc/refman/5.0/en/commands-out-of-sync.html But In First Query I am not fetching any data

Considering following table that doesn't have any primary key, can I select every other row? col1 col2 2 a 1 b 3 c 12 g first select must find: 2, 3 second select must find: 1, 12 is that possible? In unique MySQL fashion: select * from ( select * , @rn := @rn + 1 as rn from Table1 join (select @rn := 0) i ) s where rn mod 2 = 0 -- Use = 1 for the other set Example at SQL Fiddle. This should work for MySQL: SELECT col1, col2 FROM ( SELECT col1, col2, @rowNumber:=@rowNumber+ 1 rn FROM YourTable JOIN (SELECT @rowNumber:= 0) r ) t WHERE rn % 2 = 1 This uses % which is the MOD operator. And here