SqliteDriver::sqlRandom() - Code Metrics - kristuff/patabase - Measure and Improve Code Quality continuously with Scrutinizer

SqliteDriver::sqlRandom() A
last analyzed 2022-04-08 21:26 UTC

↳ Parent: SqliteDriver

Complexity

Conditions	2
Paths	2

Size

Total Lines	4
Code Lines	2

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
cc	2
eloc	2
c	1
b	0
f	0
nc	2
nop	1
dl	0
loc	4
rs	10

<?php declare(strict_types=1);

/** 
 *  ___      _        _
 * | _ \__ _| |_ __ _| |__  __ _ ___ ___
 * |  _/ _` |  _/ _` | '_ \/ _` (_-</ -_)
 * |_| \__,_|\__\__,_|_.__/\__,_/__/\___|
 * 
 * This file is part of Kristuff\Patabase.
 * (c) Kristuff <[email protected]>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 *
 * @version    1.0.1
 * @copyright  2017-2022 Christophe Buliard
 */

namespace Kristuff\Patabase\Driver\Sqlite;

use Kristuff\Patabase\Driver\DatabaseDriver;

/**
 * Class SqliteDriver
 *
 * SQLite 3 Driver
 *
 * Data types
 *  INT, INTEGER, TINYINT, SMALLINT, MEDIUMINT, BIGINT, UNSIGNED BIG INT, INT2, INT8 	=> INTEGER 
 *  CHARACTER(20), VARCHAR(255), VARYING CHARACTER(255), NCHAR(55), 
 *      NATIVE CHARACTER(70), NVARCHAR(100), CLOB, TEXT                                 => TEXT
 *  BLOB, no datatype specified 	                                                    => BLOB
 *  REAL, DOUBLE, DOUBLE PRECISION, FLOAT 	                                            => REAL
 *  NUMERIC, DECIMAL(10,5), BOOLEAN, DATE, DATETIME 	                                => NUMERIC
 */
class SqliteDriver extends DatabaseDriver
{

    /**
     * List of DSN attributes
     * 
     * In Sqlite, the database attribute represent the full path to the database
     * To create a database in memory, define the database to :memory: 
     *
     * @access protected
     * @var array
     */
    protected $dsnAttributes = array(
        'database'
    );

    /**
     * Create a new PDO connection
     *
     * @access public
     * @param array   $settings
     *
     * @return void
     */
    public function createConnection(array $settings): void
    {
        $this->pdo = new \PDO('sqlite:'.$settings['database']); 

        //$this->pdo->setAttribute(\PDO::ATTR_EMULATE_PREPARES, false);
        //$this->pdo->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION);

        // Foreign key constraints are disabled by default (for backwards compatibility), 
        // so must be enabled separately for each database connection.
        // @see https://www.sqlite.org/foreignkeys.html
        $this->enableForeignKeys();
    }

    /**
     * Escape an identifier
     *
     * @access public
     * @param string  $identifier
     *
     * @return string
     */
    public function escapeIdentifier(string $identifier): string
    {
        return '"'.$identifier.'"';
    }
       
    /**
     * Escape a value
     *
     * @access public
     * @param string  $value
     *
     * @return string
     */
    public function escapeValue(string $value): string
    {
        return '"'.$value.'"';
    }

    /**
     * Get last inserted id
     *
     * @access public
     * @return string
     */
    public function lastInsertedId(): string
    {
        return $this->pdo->lastInsertId();
    }

    /**
     * Get whether foreign keys are enabled or not
     *
     * https://www.sqlite.org/foreignkeys.html
     *  Foreign key constraints are disabled by default (for backwards compatibility), so must be enabled separately for 
     *  each database connection. (Note, however, that future releases of SQLite might change so that foreign key constraints 
     *  enabled by default. Careful developers will not make any assumptions about whether or not foreign keys are enabled by 
     *  default but will instead enable or disable them as necessary.) The application can also use a PRAGMA foreign_keys 
     *  statement to determine if foreign keys are currently enabled. 
     * @access public
     * @return bool True if foreign keys are enabled, otherwise false
     */
    public function isForeignKeyEnabled(): bool
    {
        $query = $this->pdo->prepare('PRAGMA foreign_keys');
        return  $query->execute() && (int) $query->fetchColumn() === 1;
    }

    /**
     * Enable foreign keys
     *
     * @access public
     * @return void
     */
    public function enableForeignKeys(): void
    {
        $this->pdo->exec('PRAGMA foreign_keys = ON');
    }

    /**
     * Disable foreign keys
     *
     * @access public
     * @return void
     */
    public function disableForeignKeys(): void
    {
        $this->pdo->exec('PRAGMA foreign_keys = OFF');
    }

    /**
     * Add a foreign key
     *
     * This is not supported on sqlite and returns false.
     * 
     * @access public
     * @param string   $fkName         The constraint name
     * @param string   $srcTable       The source table
     * @param string   $srcColumn      The source column 
     * @param string   $refTable       The referenced table
     * @param string   $refColumn      The referenced column
     *
     * @return bool    True if the foreign key has been created, otherwise false
     */
    public function addForeignKey(string $fkName, string $srcTable, string $srcColumn, string $refTable, string $refColumn): bool
    {
        return false;
    }

    /**
     * Drop a foreign key
     *
     * This is not supported on sqlite and returns false.
     * 
     * @access public
     * @param string  $fkName          The constraint name
     * @param string  $tableName       The source table
     *
     * @return bool    True if the foreign key has been dropped, otherwise false
     */
    public function dropForeignKey(string $fkName, string $tableName): bool
    {
        return false;
    }
    
    /**
     * Get the SQL for show tables
     *
     * @access public
     * @return string
     */
    public function sqlShowTables(): string
    {
        return 'SELECT name FROM sqlite_master WHERE type = "table";';
    }

    /**
     * Get the SQL for random function 
     *
     * @access public
     * @param  mixed    $seed    Random seed. Default is null.
     *
     * @return string         
     */
    public function sqlRandom($seed = null): string
    {
        $seed = !empty($seed) ? $seed : '';  
        return sprintf('random(%s)', $seed);   
    }

    /**
     * Get the SQL for auto increment column
     *
     * @access public
     * @param string   $type   The sql column type
     * 
     * @return string
     */
    public function sqlColumnAutoIncrement(string $type): string
    {
        // http://www.sqlite.org/datatypes.html
        //  One exception to the typelessness of SQLite is a column whose type is INTEGER PRIMARY KEY. (And you 
        //  must use "INTEGER" not "INT". A column of type INT PRIMARY KEY is typeless just like any other.) 
        //  INTEGER PRIMARY KEY columns must contain a 32-bit signed integer. Any attempt to insert non-integer data 
        //  will result in an error. INTEGER PRIMARY KEY columns can be used to implement the equivalent of AUTOINCREMENT.
        // 
        // https://sqlite.org/autoinc.html
        //  If the AUTOINCREMENT keyword appears after INTEGER PRIMARY KEY, that changes the automatic ROWID assignment 
        //  algorithm to prevent the reuse of ROWIDs over the lifetime of the database. In other words, the purpose 
        //  of AUTOINCREMENT is to prevent the reuse of ROWIDs from previously deleted rows. 
        return 'INTEGER';
    }
}

1			<?php declare(strict_types=1);
2
3			/**
4			* ___ _ _
5			* \| _ \__ _\| \|_ __ _\| \|__ __ _ ___ ___
6			* \| _/ _` \| _/ _` \| '_ \/ _` (_-</ -_)
7			* \|_\| \__,_\|\__\__,_\|_.__/\__,_/__/\___\|
8			*
9			* This file is part of Kristuff\Patabase.
10			* (c) Kristuff <[email protected]>
11			*
12			* For the full copyright and license information, please view the LICENSE
13			* file that was distributed with this source code.
14			*
15			* @version 1.0.1
16			* @copyright 2017-2022 Christophe Buliard
17			*/
18
19			namespace Kristuff\Patabase\Driver\Sqlite;
20
21			use Kristuff\Patabase\Driver\DatabaseDriver;
22
23			/**
24			* Class SqliteDriver
25			*
26			* SQLite 3 Driver
27			*
28			* Data types
29			* INT, INTEGER, TINYINT, SMALLINT, MEDIUMINT, BIGINT, UNSIGNED BIG INT, INT2, INT8 => INTEGER
30			* CHARACTER(20), VARCHAR(255), VARYING CHARACTER(255), NCHAR(55),
31			* NATIVE CHARACTER(70), NVARCHAR(100), CLOB, TEXT => TEXT
32			* BLOB, no datatype specified => BLOB
33			* REAL, DOUBLE, DOUBLE PRECISION, FLOAT => REAL
34			* NUMERIC, DECIMAL(10,5), BOOLEAN, DATE, DATETIME => NUMERIC
35			*/
36			class SqliteDriver extends DatabaseDriver
37			{
38
39			/**
40			* List of DSN attributes
41			*
42			* In Sqlite, the database attribute represent the full path to the database
43			* To create a database in memory, define the database to :memory:
44			*
45			* @access protected
46			* @var array
47			*/
48			protected $dsnAttributes = array(
49			'database'
50			);
51
52			/**
53			* Create a new PDO connection
54			*
55			* @access public
56			* @param array $settings
57			*
58			* @return void
59			*/
60			public function createConnection(array $settings): void
61			{
62			$this->pdo = new \PDO('sqlite:'.$settings['database']);
63
64			//$this->pdo->setAttribute(\PDO::ATTR_EMULATE_PREPARES, false);
65			//$this->pdo->setAttribute(\PDO::ATTR_ERRMODE, \PDO::ERRMODE_EXCEPTION);
66
67			// Foreign key constraints are disabled by default (for backwards compatibility),
68			// so must be enabled separately for each database connection.
69			// @see https://www.sqlite.org/foreignkeys.html
70			$this->enableForeignKeys();
71			}
72
73			/**
74			* Escape an identifier
75			*
76			* @access public
77			* @param string $identifier
78			*
79			* @return string
80			*/
81			public function escapeIdentifier(string $identifier): string
82			{
83			return '"'.$identifier.'"';
84			}
85
86			/**
87			* Escape a value
88			*
89			* @access public
90			* @param string $value
91			*
92			* @return string
93			*/
94			public function escapeValue(string $value): string
95			{
96			return '"'.$value.'"';
97			}
98
99			/**
100			* Get last inserted id
101			*
102			* @access public
103			* @return string
104			*/
105			public function lastInsertedId(): string
106			{
107			return $this->pdo->lastInsertId();
108			}
109
110			/**
111			* Get whether foreign keys are enabled or not
112			*
113			* https://www.sqlite.org/foreignkeys.html
114			* Foreign key constraints are disabled by default (for backwards compatibility), so must be enabled separately for
115			* each database connection. (Note, however, that future releases of SQLite might change so that foreign key constraints
116			* enabled by default. Careful developers will not make any assumptions about whether or not foreign keys are enabled by
117			* default but will instead enable or disable them as necessary.) The application can also use a PRAGMA foreign_keys
118			* statement to determine if foreign keys are currently enabled.
119			* @access public
120			* @return bool True if foreign keys are enabled, otherwise false
121			*/
122			public function isForeignKeyEnabled(): bool
123			{
124			$query = $this->pdo->prepare('PRAGMA foreign_keys');
125			return $query->execute() && (int) $query->fetchColumn() === 1;
126			}
127
128			/**
129			* Enable foreign keys
130			*
131			* @access public
132			* @return void
133			*/
134			public function enableForeignKeys(): void
135			{
136			$this->pdo->exec('PRAGMA foreign_keys = ON');
137			}
138
139			/**
140			* Disable foreign keys
141			*
142			* @access public
143			* @return void
144			*/
145			public function disableForeignKeys(): void
146			{
147			$this->pdo->exec('PRAGMA foreign_keys = OFF');
148			}
149
150			/**
151			* Add a foreign key
152			*
153			* This is not supported on sqlite and returns false.
154			*
155			* @access public
156			* @param string $fkName The constraint name
157			* @param string $srcTable The source table
158			* @param string $srcColumn The source column
159			* @param string $refTable The referenced table
160			* @param string $refColumn The referenced column
161			*
162			* @return bool True if the foreign key has been created, otherwise false
163			*/
164			public function addForeignKey(string $fkName, string $srcTable, string $srcColumn, string $refTable, string $refColumn): bool
165			{
166			return false;
167			}
168
169			/**
170			* Drop a foreign key
171			*
172			* This is not supported on sqlite and returns false.
173			*
174			* @access public
175			* @param string $fkName The constraint name
176			* @param string $tableName The source table
177			*
178			* @return bool True if the foreign key has been dropped, otherwise false
179			*/
180			public function dropForeignKey(string $fkName, string $tableName): bool
181			{
182			return false;
183			}
184
185			/**
186			* Get the SQL for show tables
187			*
188			* @access public
189			* @return string
190			*/
191			public function sqlShowTables(): string
192			{
193			return 'SELECT name FROM sqlite_master WHERE type = "table";';
194			}
195
196			/**
197			* Get the SQL for random function
198			*
199			* @access public
200			* @param mixed $seed Random seed. Default is null.
201			*
202			* @return string
203			*/
204			public function sqlRandom($seed = null): string
205			{
206			$seed = !empty($seed) ? $seed : '';
207			return sprintf('random(%s)', $seed);
208			}
209
210			/**
211			* Get the SQL for auto increment column
212			*
213			* @access public
214			* @param string $type The sql column type
215			*
216			* @return string
217			*/
218			public function sqlColumnAutoIncrement(string $type): string
219			{
220			// http://www.sqlite.org/datatypes.html
221			// One exception to the typelessness of SQLite is a column whose type is INTEGER PRIMARY KEY. (And you
222			// must use "INTEGER" not "INT". A column of type INT PRIMARY KEY is typeless just like any other.)
223			// INTEGER PRIMARY KEY columns must contain a 32-bit signed integer. Any attempt to insert non-integer data
224			// will result in an error. INTEGER PRIMARY KEY columns can be used to implement the equivalent of AUTOINCREMENT.
225			//
226			// https://sqlite.org/autoinc.html
227			// If the AUTOINCREMENT keyword appears after INTEGER PRIMARY KEY, that changes the automatic ROWID assignment
228			// algorithm to prevent the reuse of ROWIDs over the lifetime of the database. In other words, the purpose
229			// of AUTOINCREMENT is to prevent the reuse of ROWIDs from previously deleted rows.
230			return 'INTEGER';
231			}
232			}

kristuff / patabase

SqliteDriver::sqlRandom() A last analyzed 2022-04-08 21:26 UTC

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SqliteDriver::sqlRandom() A
last analyzed 2022-04-08 21:26 UTC