Question

I have the following queries for inserting and deleting records from preorder traversal database. I am using codeigniter and dont know how to fire multiple queries in it. I tried following queries but not firing properly in codeigniter and firing properly using phpmyadmin.

Query for Inserting record into the database:

$level = $_GET['level'] + 1;
$rgt = $_GET['rgt'] + 1;
if ($_GET['level'] == 0) {
    $sql = "UPDATE xp_subunit SET lft = lft+2, rgt=rgt+2 WHERE rgt > " . $_GET['rgt'] . "; ";
    $sql .="INSERT INTO xp_subunit SET level=" . $level . ", lft =" . $_GET['rgt'] . ", rgt =  " . $rgt . " , name = '" . $_GET['name'] . "', unit_id='" . $_GET['unit_id'] . "', description='" . $_GET['description'] . "';";
    echo $sql;
} else {
    $sql = "UPDATE xp_subunit SET rgt = rgt+2 WHERE rgt > " . $_GET['lft'] . "; ";
    $sql .="INSERT INTO xp_subunit SET level=" . $level . ", lft =" . $_GET['rgt'] . ", rgt =  " . $rgt . " , name = '" . $_GET['name'] . "', unit_id='" . $_GET['unit_id'] . "', description='" . $_GET['description'] . "';";
    echo $sql;
}
echo $query = $this->db->insert($this->tablename, $sql);

Query for deleting record from database:

$sql .= "SELECT @myLeft := " . $_GET['lft'] . ", @myRight :=  " . $_GET['rgt'] . ", @myWidth :=  " . $_GET['lft'] . " - lft + 1
    FROM xp_subunit WHERE id =" . $_GET['id'] . "; ";
$sql .= "DELETE FROM xp_subunit WHERE lft BETWEEN @myLeft AND @myRight; ";
$sql .= "UPDATE xp_subunit SET rgt = rgt - @myWidth WHERE rgt > @myRight; ";
$sql .= "UPDATE xp_subunit SET lft = lft - @myWidth WHERE lft > @myRight; ";
echo $query = $this->db->mysqli_multi_query($sql);

Whats wrong with above queries?

Answer 1

Used batch update and insert functions are available. The codeigniter’s used guide will help you. Try the following link:

http://codeigniter.com/user_guide/database/active_record.html