From b0dd10f8171945e0c1f3527dd1e9d18b043e01a7 Mon Sep 17 00:00:00 2001 From: admin Date: Fri, 25 Aug 2006 17:25:49 +0000 Subject: Initial Import --- user_guide/libraries/database/connecting.html | 172 ++++++++++++++++++++++++++ 1 file changed, 172 insertions(+) create mode 100644 user_guide/libraries/database/connecting.html (limited to 'user_guide/libraries/database/connecting.html') diff --git a/user_guide/libraries/database/connecting.html b/user_guide/libraries/database/connecting.html new file mode 100644 index 000000000..7bf93c302 --- /dev/null +++ b/user_guide/libraries/database/connecting.html @@ -0,0 +1,172 @@ + + + + +Code Igniter User Guide + + + + + + + + + + + + + + + + + + + + + + +
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Code Igniter User Guide Version 1.4.0

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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 core 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.

+ + +

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";
+$config['dbdriver'] = "mysql";
+$config['dbprefix'] = "";
+$config['pconnect'] = FALSE;
+$config['db_debug'] = TRUE;
+$config['active_r'] = TRUE;
+
+$this->load->database($config); + +

For information on each of these values please see the configuration page. + +

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'); + +

Note that if you use a DSN you will not be able to specify some of the default values like you can if you use a connection array.

+ + + + +

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.

+ +
+

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...

+ +
+ + + + + +
+ + + + + + + \ No newline at end of file -- cgit v1.2.3-24-g4f1b