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authorAndrey Andreev <narf@devilix.net>2018-06-12 15:45:46 +0200
committerAndrey Andreev <narf@devilix.net>2018-06-12 15:45:46 +0200
commit30e2eafa86c4c7b6b39cea3e7089a90df9f603fb (patch)
tree391bc1e62d8d0ad045e18a6da72e3e2a59e91503 /user_guide_src/source/database/connecting.rst
parenta9da3dd2f16a8f97d7bc4ff5572b28e4bb84c813 (diff)
[ci skip] 3.1.9 release
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-###########################
-Connecting to your Database
-###########################
-
-There are two ways to connect to a database:
-
-Automatically Connecting
-========================
-
-The "auto connect" feature will load and instantiate the database class
-with every page load. To enable "auto connecting", add the word database
-to the library array, as indicated in the following file:
-
-application/config/autoload.php
-
-Manually Connecting
-===================
-
-If only some of your pages require database connectivity you can
-manually connect to your database by adding this line of code in any
-function where it is needed, or in your class constructor to make the
-database available globally in that class.
-
-::
-
- $this->load->database();
-
-If the above function does **not** contain any information in the first
-parameter it will connect to the group specified in your database config
-file. For most people, this is the preferred method of use.
-
-Available Parameters
---------------------
-
-#. The database connection values, passed either as an array or a DSN
- string.
-#. TRUE/FALSE (boolean). Whether to return the connection ID (see
- Connecting to Multiple Databases below).
-#. TRUE/FALSE (boolean). Whether to enable the Query Builder class. Set
- to TRUE by default.
-
-Manually Connecting to a Database
----------------------------------
-
-The first parameter of this function can **optionally** be used to
-specify a particular database group from your config file, or you can
-even submit connection values for a database that is not specified in
-your config file. Examples:
-
-To choose a specific group from your config file you can do this::
-
- $this->load->database('group_name');
-
-Where group_name is the name of the connection group from your config
-file.
-
-To connect manually to a desired database you can pass an array of
-values::
-
- $config['hostname'] = 'localhost';
- $config['username'] = 'myusername';
- $config['password'] = 'mypassword';
- $config['database'] = 'mydatabase';
- $config['dbdriver'] = 'mysqli';
- $config['dbprefix'] = '';
- $config['pconnect'] = FALSE;
- $config['db_debug'] = TRUE;
- $config['cache_on'] = FALSE;
- $config['cachedir'] = '';
- $config['char_set'] = 'utf8';
- $config['dbcollat'] = 'utf8_general_ci';
- $this->load->database($config);
-
-For information on each of these values please see the :doc:`configuration
-page <configuration>`.
-
-.. note:: For the PDO driver, you should use the $config['dsn'] setting
- instead of 'hostname' and 'database':
-
- |
- | $config['dsn'] = 'mysql:host=localhost;dbname=mydatabase';
-
-Or you can submit your database values as a Data Source Name. DSNs must
-have this prototype::
-
- $dsn = 'dbdriver://username:password@hostname/database';
- $this->load->database($dsn);
-
-To override default config values when connecting with a DSN string, add
-the config variables as a query string.
-
-::
-
- $dsn = 'dbdriver://username:password@hostname/database?char_set=utf8&dbcollat=utf8_general_ci&cache_on=true&cachedir=/path/to/cache';
- $this->load->database($dsn);
-
-Connecting to Multiple Databases
-================================
-
-If you need to connect to more than one database simultaneously you can
-do so as follows::
-
- $DB1 = $this->load->database('group_one', TRUE);
- $DB2 = $this->load->database('group_two', TRUE);
-
-Note: Change the words "group_one" and "group_two" to the specific
-group names you are connecting to (or you can pass the connection values
-as indicated above).
-
-By setting the second parameter to TRUE (boolean) the function will
-return the database object.
-
-.. note:: When you connect this way, you will use your object name to issue
- commands rather than the syntax used throughout this guide. In other
- words, rather than issuing commands with:
-
- |
- | $this->db->query();
- | $this->db->result();
- | etc...
- |
- | You will instead use:
- |
- | $DB1->query();
- | $DB1->result();
- | etc...
-
-.. note:: You don't need to create separate database configurations if you
- only need to use a different database on the same connection. You
- can switch to a different database when you need to, like this:
-
- | $this->db->db_select($database2_name);
-
-Reconnecting / Keeping the Connection Alive
-===========================================
-
-If the database server's idle timeout is exceeded while you're doing
-some heavy PHP lifting (processing an image, for instance), you should
-consider pinging the server by using the reconnect() method before
-sending further queries, which can gracefully keep the connection alive
-or re-establish it.
-
-::
-
- $this->db->reconnect();
-
-Manually closing the Connection
-===============================
-
-While CodeIgniter intelligently takes care of closing your database
-connections, you can explicitly close the connection.
-
-::
-
- $this->db->close(); \ No newline at end of file