Summary of Optimized Writing of Codeigniter Operational Database Tables

codeigniter has been used for some time, 1 has not done anything to summarize.Now summarize some of the Codeigniter operation database table optimizations, although not complete, but can really help those who have just started CI.

Link Database

$this->load->database();// Manual connection to database 
// Connect to multiple databases 
$DB1 = $this->load->database('group_one', TRUE);
$DB2 = $this->load->database('group_two', TRUE); 

query

// Parameter Binding Form 
$sql = "SELECT * FROM some_table WHERE id = ? AND status = ? AND author = ?"; 
$this->db->query($sql, array(3, 'live', 'Rick'));

// Multi-Result Standard Query 
$query = $this->db->query($sql); // custom 
$query = $this->db->get('tablename'); // Convenient form, equivalent to :SELECT * FROM tablename
$query = $this->db->get('tablename', 10, 20); //  Amount to : SELECT * FROM tablename LIMIT 20, 10

$query->result() // Object Form 
$query->result_array() // Array Form 
/*
foreach ($query->result() as $row)
{
    echo $row->title;
    echo $row->name;
    echo $row->email;
}
*/
$query->num_rows() // Total number of bars 
$query->num_fields() // Number of fields 

// Single Result Standard Query 
$row = $query->row(); // Object Form 
$row = $query->row_array(); // Array Form 
/*
$row = $query->row_array();
echo $row['name'];
*/

insert

$data = array(
                'title' => $title,
                'name' => $name
                );
$this->db->insert('tablename', $data); // Easy insertion 
$this->db->insert_string('tablename', $data);  // Easy insertion 

$this->db->insert_id() // Newly inserted id
$this->db->affected_rows() // Number of rows affected (update,insert)

To update

$data = array(
                'name' => $name, 
                'email' => $email
                );
$where = "id = 1"; 
$this->db->update('tablename', $data); 
$this->db->update_string('tablename', $data, $where);

delete

$array = array(
                'name' => $name, 
                'title' => $title
                );
$this->db->delete('tablename', $array); 

// Produces:
// "DELETE FROM tablename WHERE name = '$name' AND title = "$title""

$this->db->truncate('tablename'); // Empty table 
// Produce: TRUNCATE tablename

 

-----------------------------------------------------
 ( where ) 
-------

$array = array(
                'name' => $name, 
                'title' => $title
                );
$this->db->where($array); 
// Produces: "WHERE name = '$name' AND title = "$title"" 
-----------------------------------------------------
$this->db->count_all('tablename'); // Total number of rows recorded in the table 
-----------------------------------------------------
$query->free_result() // Release Resources