A simple database traceback

Introduction. I checked the code today and flew all the way to the database.

<span>1</span><span>$this->slave()->select('sina_user_id, sina_nickname, password')->from(self::Table_User_Info)</span>

Obviously the table .user_info has been determined here;

This file is not loaded->database();

As the name: slave() is from Library, trace slave(). Sure enough, the library name string is combined here,

<span>1</span><span>    public function slave($dbName = 'default')
</span><span>2</span>     { 
<span>3</span>     }

func. Inside load->database();

Check database() in loader; there is the following sentence,

<span>1</span><span><strong>require</strong>_once(BASEPATH.'database/DB.php');</span>

Find DB.php;

<span>1</span><span>    if ( ! defined('ENVIRONMENT') OR ! file_exists($file_path = BASEPATH.'config/'.ENVIRONMENT.'/database.php'))</span>

The introduction of multiple database attributes in this file, see core file analysis for details.

Finally found the location of database.php

<span> 1</span><span>// Default DB Config
</span><span> 2</span><span>$db['default_master']['hostname'] = 'localhost';
</span><span> 3</span><span>$db['default_master']['username'] = 'admin';
</span><span> 4</span><span>$db['default_master']['password'] = '12345678';
</span><span> 5</span><span>$db['default_master']['database'] = ' ';
</span><span> 6</span><span>$db['default_master']['port'] = 3306;
</span><span> 7</span><span>$db['default_master']['dbdriver'] = 'mysql';
</span><span> 8</span><span>$db['default_master']['pconnect'] = FALSE;
</span><span> 9</span><span>$db['default_master']['db_debug'] = TRUE;
</span><span>10</span><span>$db['default_master']['cache_on'] = FALSE;
</span><span>11</span><span>$db['default_master']['cachedir'] = '';
</span><span>12</span><span>$db['default_master']['char_set'] = 'utf8';
</span><span>13</span><span>$db['default_master']['dbcollat'] = 'utf8_general_ci';
</span><span>14</span><span>$db['default_master']['swap_pre'] = '';
</span><span>15</span><span>$db['default_master']['autoinit'] = TRUE;
</span><span>16</span><span>$db['default_master']['stricton'] = FALSE;</span>

Tracing the database is completed.

The above introduces a simple database tracing, including the require content. I hope it will be helpful to friends who are interested in PHP tutorials.