function for connection to the database using PHP PDO. PDO stands for php data object. you can read more about PDO here PHP PDO
public function connect($dbname, $username, $password, $host='127.0.0.1')
{
try
{
$db_connection = new PDO('mysql:host = '.$host.'; dbname='.$dbname, $username, $password);
$db_connection->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
} catch (PDOException $e)
{
die('Unable to connect to the database');
};
return $db_connection;
}This is a dynamic function used for creating new records in the database. Parameters: $tablename - String $values - Array E.g: $tablename - 'users' $values - array('firstname'=>'john', 'lastname'=>'doe'); example: create($tablename, $values);
public function create($tablename, $values)
{
$columnString = implode(',', array_keys($values));
$valueString = implode(',', array_fill(0, count($values), '?'));
$sql = "INSERT INTO ".$tablename." ({$columnString}) VALUES ({$valueString})";
$query = $this->handler->prepare($sql);
if($query->execute(array_values($values)))
{
return true;
}else{
return false;
}
}This is a dynamic function used for modifying database records. Parameters: $Tablename - String $column - String $id - String/Int $values - Array E.g $tablename - 'users' $columns - 'id' $id - 1 $values - array('firstname'=>'john', 'lastname'=>'doe');
public function update($tablename, $column, $id, $values)
{
$columns = implode(',', array_keys($values));
$columns = explode(',', $columns);
$values = implode(',', array_values($values));
$values = explode(',', $values);
$na; $columnString = array();
$valueArray = array();
for ($i=0; $i<count($columns); $i++) {
$na = $columns[$i]."=?";
array_push($columnString, $na);
array_push($valueArray,$values[$i]);
}
$cstring = implode(',', $columnString);
array_push($valueArray, $id);
$sql = "UPDATE " . $tablename . " SET " . $cstring . " WHERE " . $column . " = ?";
$query = $this->handler->prepare($sql);
if ($query->execute($valueArray)) {
return true;
} else {
return false;
}
}Deleting a database record.
Parameters:
$tablename - String
$column - String
$id - String/Int
E.g: $tablename - 'users' $column - ID $id - 3
public function delete($tablename, $column, $id)
{
$sql = "DELETE FROM ".$tablename." WHERE ".$column." = ?";
$query = $this->handler->prepare($sql);
if($query->execute(array($id)))
{
return true;
}
else
{
return false;
}
}Get all rows from the database table
Parameters:
$tablename: String
E.g
$tablename - 'users'
public function selectAll($tablename, $order = "DESC")
{
$sql = "SELECT * FROM ".$tablename." ";
$sql .= " ORDER BY `id` ".$order." ";
$query = $this->handler->query($sql);
return $query;
}Get row from the database table by id Parameters: $tablename: String $id: Int E.g $table - 'users' $id - 1
public function selectById($table,$id)
{
if (isset($id))
{
$sql = "SELECT * FROM ".$table." WHERE id=? LIMIT 1";
$query = $this->handler->prepare($sql);
$query->execute(array($id));
return $query;
}
else
{
return false;
}
}Select an entire column from a database.
public function selectColumn($table, $column)
{
if (isset($column) && isset($table))
{
$sql = "SELECT ".$column." FROM ".$table." ORDER BY id DESC";
$query = $this->handler->prepare($sql);
$query->execute(array($id));
return $query;
} else{return false; }
}
function to find a particlar row in a databasee.
public function Find($table, $column ,$name)
{
if (isset($name))
{
$sql = "SELECT * FROM ".$table." WHERE ".$column."=? ORDER BY id DESC";
$query = $this->handler->prepare($sql);
$query->execute(array($name));
return $query;
} else{ return false; }
}