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generateUniqueId() and more useless/deprecated methods removed, code speed-up, link...
[shipsimu.git] / inc / classes / middleware / database / class_DatabaseConnection.php
1 <?php
2 /**
3  * Database selector class
4  *
5  * @author              Roland Haeder <webmaster@ship-simu.org>
6  * @version             0.0.0
7  * @copyright   Copyright (c) 2007, 2008 Roland Haeder, this is free software
8  * @license             GNU GPL 3.0 or any newer version
9  * @link                http://www.ship-simu.org
10  *
11  * This program is free software: you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation, either version 3 of the License, or
14  * (at your option) any later version.
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19  * GNU General Public License for more details.
20  *
21  * You should have received a copy of the GNU General Public License
22  * along with this program. If not, see <http://www.gnu.org/licenses/>.
23  */
24 class DatabaseConnection extends BaseMiddleware implements DatabaseConnector, Registerable {
25         /**
26          * Array for connection data
27          */
28         private $connectData = array(
29                 'login' => "",
30                 'pass'  => "",
31                 'dbase' => "",
32                 'host'  => ""
33         );
34
35         // The real database layer
36         private $dbLayer = null;
37
38         // An instance of this class
39         private static $thisInstance = null;
40
41         /**
42          * Protected constructor
43          *
44          * @return      void
45          */
46         protected function __construct() {
47                 // Call parent constructor
48                 parent::__construct(__CLASS__);
49         }
50
51         // Create new database connection layer
52         public final static function createDatabaseConnection (DebugMiddleware $debugInstance, DatabaseFrontendInterface $dbLayer) {
53                 // Get instance
54                 $dbInstance = new DatabaseConnection();
55
56                 // Set debug output handler
57                 $dbInstance->setDebugInstance($debugInstance);
58
59                 // Set database layer
60                 $dbInstance->setDatabaseLayer($dbLayer);
61
62                 // Set db instance
63                 self::$thisInstance = $dbInstance;
64
65                 // Return instance
66                 return $dbInstance;
67         }
68
69         // Get an instance of this class
70         public final static function getInstance () {
71                 return self::$thisInstance;
72         }
73
74         // Public setter for database connection
75         public final function setConnectionData ($login, $pass, $dbase, $host="localhost") {
76                 // Transfer connection data
77                 $this->connectData['login'] = (string) $login;
78                 $this->connectData['pass']  = (string) $pass;
79                 $this->connectData['dbase'] = (string) $dbase;
80                 $this->connectData['host']  = (string) $host;
81         }
82
83         /**
84          * Getter for connection data
85          *
86          * @return      $connectData    Connection data stored with this clas
87          */
88         public final function getConnectionData () {
89                 return $this->connectData;
90         }
91
92         /**
93          * Setter for the real database layer
94          * @param       $dbLayer        An instance of the real database layer
95          * @return      void
96          */
97         public final function setDatabaseLayer (DatabaseFrontendInterface $dbLayer) {
98                 $this->dbLayer = $dbLayer;
99         }
100
101         /**
102          * Analyses if a unique ID has already been used or not. This method does
103          * only pass the given ID through to the "real" database layer.
104          *
105          * @param       $uniqueID               A unique ID number which shall be checked
106          *                                                      before it will be used
107          * @param       $inConstructor  If called from a constructor or from
108          *                                                      somewhere else
109          * @return      $isUnused               true    = The unique ID was not found in the database,
110          *                                                      false = It is already in use by an other object
111          */
112         public function isUniqueIdUsed ($uniqueID, $inConstructor = false) {
113                 // Connect to the database
114                 $this->dbLayer->connectToDatabase();
115
116                 // Pass the returning result through
117                 return $this->dbLayer->isUniqueIdUsed($uniqueID, $inConstructor);
118         }
119
120         /**
121          * Runs a "select" statement on the database layer with given table name
122          * and criteria. If this doesn't fail the result will be returned
123          *
124          * @param       $tableName                      Name of the "table" we shall query
125          * @param       $criteriaInstance       An instance of a Criteria class
126          * @return      $result                         The result as an array
127          */
128         public function doSelectByTableCriteria ($tableName, Criteria $criteriaInstance) {
129                 // Connect to the database
130                 $this->dbLayer->connectToDatabase();
131
132                 // Get result from query
133                 $result = $this->dbLayer->querySelect("array", $tableName, $criteriaInstance);
134
135                 // Return the result
136                 return $result;
137         }
138
139         /**
140          * Getter for last exception
141          *
142          * @return      $exceptionInstance      Last thrown exception
143          */
144         public final function getLastException () {
145                 $exceptionInstance = $this->dbLayer->getLastException();
146                 return $exceptionInstance;
147         }
148
149         /**
150          * "Inserts" a data set instance into a local file database folder
151          *
152          * @param       $dataSetInstance        A storeable data set
153          * @return      void
154          */
155         public function queryInsertDataSet (StoreableCriteria $dataSetInstance) {
156                 // Connect to the database
157                 $this->dbLayer->connectToDatabase();
158
159                 // Ask the database layer
160                 $this->dbLayer->queryInsertDataSet($dataSetInstance);
161         }
162
163         /**
164          * "Updates" a data set instance with a database layer
165          *
166          * @param       $dataSetInstance        A storeable data set
167          * @return      void
168          */
169         public function queryUpdateDataSet (StoreableCriteria $dataSetInstance) {
170                 // Connect to the database
171                 $this->dbLayer->connectToDatabase();
172
173                 // Ask the database layer
174                 $this->dbLayer->queryUpdateDataSet($dataSetInstance);
175         }
176
177         /**
178          * Getter for primary key column of specified table name
179          *
180          * @param       $tableName              Name of table we need the primary key column from
181          * @return      $primaryKey             Primary key column of requested table
182          */
183         public function getPrimaryKeyOfTable ($tableName) {
184                 // Connect to the database
185                 $this->dbLayer->connectToDatabase();
186
187                 // Ask the database layer
188                 $primaryKey = $this->dbLayer->getPrimaryKeyOfTable($tableName);
189
190                 // Return the value
191                 return $primaryKey;
192         }
193 }
194
195 // [EOF]
196 ?>