Connecting codeigniter to mysql and oracle in the

问题:

I'm using Mysql and Oracle for my CI application. I tried to connect it but I found that I cannot make a query to Oracle database. It always gave an error that the table is not exist.

I already set the database.php to something like this

$active_group = 'oracle';
$active_record = true;

$db['oracle']['hostname'] = '10.10.10.1:1521/ocidb';
$db['oracle']['username'] = 'ociuser';
$db['oracle']['password'] = 'ocipass';
$db['oracle']['database'] = 'ocidb';
$db['oracle']['dbdriver'] = 'oci8';
$db['oracle']['dbprefix'] = '';
$db['oracle']['pconnect'] = TRUE;
$db['oracle']['db_debug'] = FALSE;
$db['oracle']['cache_on'] = FALSE;
$db['oracle']['cachedir'] = '';
$db['oracle']['char_set'] = 'utf8';
$db['oracle']['dbcollat'] = 'utf8_general_ci';
$db['oracle']['swap_pre'] = '';
$db['oracle']['autoinit'] = TRUE;
$db['oracle']['stricton'] = FALSE;

$active_group = 'default';
$active_record = TRUE;

$db['default']['hostname'] = 'localhost';
$db['default']['username'] = 'root';
$db['default']['password'] = '';
$db['default']['database'] = 'mysqldb';
$db['default']['dbdriver'] = 'mysql';
$db['default']['dbprefix'] = '';
$db['default']['pconnect'] = TRUE;
$db['default']['db_debug'] = TRUE;
$db['default']['cache_on'] = FALSE;
$db['default']['cachedir'] = '';
$db['default']['char_set'] = 'utf8';
$db['default']['dbcollat'] = 'utf8_general_ci';
$db['default']['swap_pre'] = '';
$db['default']['autoinit'] = TRUE;
$db['default']['stricton'] = FALSE;

In a controller, I want to query a table in oracle so I load it there.

function citizen(){
  $this->load->database('oracle',true);

  $data['someone'] = $this->people_model->getPeople();
  
  $this->load->view('myview',$data);
}

And here is the people_model

function getPeople(){
  return $this->db->get('people')->result();
}

When I run it, it will get error

Error Number: 1146

Table 'mysqldb.people' doesn't exist

SELECT * FROM (`people`) WHERE `id` = '21111'

It seems that it still makes query into the mysql, while the table people is in oracle. I also have tried to load the oracle database in model instead of in controller but same result.

How can I make a query to oracle in this case. Any answer would be appreciated. Thanks.

回答1:

I worked with oracle and mysql using Codeigniter.

You used $this->load->database('oracle',true); this should be assigned to a variable as you used 2nd parameter true. like this

$oracle_db=$this->load->database('oracle',true);//connected with oracle
$mysql_db=$this->load->database('default',true);//connected with mysql

Now you can use these two variables for your query.Like

$oracle_db->get('people')->result();

or

$mysql_db->get('people')->result();

So finally your model should be like this(do not load database at your controller)

function __construct()//model construct function
{
    parent::__construct();
    $this->oracle_db=$this->load->database('oracle',true);
    $this->mysql_db=$this->load->database('default',true);
}
function getPeople(){
   return $this->oracle_db->get('people')->result();
}

Hope you will understand. Make sure it connects with your oracle db.

My database.php for oracle was like this

$tns = "
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = YOUR_IP)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SID = YOUR_SID)
    )
  )
       ";
$db['oracle']['hostname'] = $tns;

回答2:

You have to load the database and have to use that object to query from database

$oracle =  $this->load->database('oracle',true);
$query = $oracle->query("SELECT * FROM people");

and change the pconnect flag to false as CI have issues maintaining the persistent connection to multiple database.

回答3:

Try like this it works for me

$active_group = 'oracle';
$query_builder = TRUE;

$db['oracle'] = array(
    'dsn'   => '',
    'hostname' => '192.168.0.246:1521/orcl',
    //'hostname' => 'localhost',
    'username' => 's_dev0101', 
    'password' => 's_dev0101',
    'database' => 'testdb',
    'dbdriver' => 'oci8',
    'dbprefix' => '',
    'pconnect' => FALSE,
    'db_debug' => (ENVIRONMENT !== 'production'),
    'cache_on' => FALSE,
    'cachedir' => '',
    'char_set' => 'utf8',
    'dbcollat' => 'utf8_general_ci',
    'swap_pre' => '',
    'encrypt' => FALSE,
    'compress' => FALSE,
    'stricton' => FALSE,
    'failover' => array(),
    'save_queries' => TRUE,
    'save_queries' => TRUE,
);


$active_group = 'default';
$query_builder = TRUE;

$db['default'] = array(
    'dsn'   => '',
    'hostname' => '192.168.0.106', //192.168.0.106
    //'hostname' => 'localhost',
    'username' => 'aaa',
    'password' => 'aaa',
    'database' => 'ttttt',
    'dbdriver' => 'mysqli',
    'dbprefix' => '',
    'pconnect' => FALSE,
    'db_debug' => (ENVIRONMENT !== 'production'),
    'cache_on' => FALSE,
    'cachedir' => '',
    'char_set' => 'utf8',
    'dbcollat' => 'utf8_general_ci',
    'swap_pre' => '',
    'encrypt' => FALSE,
    'compress' => FALSE,
    'stricton' => FALSE,
    'failover' => array(),
    'save_queries' => TRUE
);

In Model:

public $db;

    function __construct()
    {
        parent::__construct();

        $this->db = $this->load->database('default',true);//connected with mysql
        $oracle_db = $this->load->database('oracle',true);//connected with oracle
        var_dump($oracle_db);
    }