MySqlDataManager::items() - Code Metrics - Inspection of "Redis database alias and display database name(s)..." - lulco/uniman - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 3e38c4...3f7c7b )

by Michal

created 2017-03-03 18:14 UTC

MySqlDataManager::items() A

↳ Parent: MySqlDataManager

Complexity

Conditions	3
Paths	3

Size

Total Lines	17
Code Lines	13

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	0
CRAP Score	12

Importance

Changes

Metric	Value
dl	0
loc	17
ccs	0
cts	15
cp	0
rs	9.4285
c	0
b	0
f	0
cc	3
eloc	13
nc	3
nop	6
crap	12

<?php

namespace UniMan\Drivers\MySql;

use UniMan\Core\DataManager\AbstractDataManager;
use UniMan\Core\Exception\OperatorNotSupportedException;
use UniMan\Core\Utils\Filter;
use UniMan\Core\Utils\Multisort;
use InvalidArgumentException;
use Nette\Utils\Strings;
use PDO;

class MySqlDataManager extends AbstractDataManager
{
    private $columns = null;

    private $connection;

    private $database;

    /**
     * cache
     * @var array|null
     */
    private $databases = null;

    public function __construct(PDO $connection)
    {
        $this->connection = $connection;
    }

    public function databases(array $sorting = [])
    {
        if ($this->databases !== null) {
            return $this->databases;
        }

        $query = 'SELECT information_schema.SCHEMATA.*, count(information_schema.TABLES.TABLE_NAME) AS tables_count, SUM(information_schema.TABLES.DATA_LENGTH) AS size
FROM information_schema.SCHEMATA
LEFT JOIN information_schema.TABLES ON information_schema.SCHEMATA.SCHEMA_NAME = information_schema.TABLES.TABLE_SCHEMA
GROUP BY information_schema.SCHEMATA.SCHEMA_NAME
ORDER BY information_schema.SCHEMATA.SCHEMA_NAME';

        $databases = [];
        foreach ($this->connection->query($query)->fetchAll(PDO::FETCH_ASSOC) as $database) {
            $databases[$database['SCHEMA_NAME']] = [
                'database' => $database['SCHEMA_NAME'],
                'charset' => $database['DEFAULT_CHARACTER_SET_NAME'],
                'collation' => $database['DEFAULT_COLLATION_NAME'],
                'tables_count' => $database['tables_count'],
                'size' => $database['size'] ?: 0,
            ];
        }
        $this->databases = $databases;
        return Multisort::sort($databases, $sorting);
    }

    protected function getDatabaseNameColumn()
    {
        return 'database';
    }

    public function tables(array $sorting = [])
    {
        $tables = [
            MySqlDriver::TYPE_TABLE => [],
            MySqlDriver::TYPE_VIEW => [],
        ];
        $type = 'BASE TABLE';
        if ($this->database == 'information_schema') {
            $type = 'SYSTEM VIEW';
        }

        foreach ($this->connection->query("SELECT * FROM information_schema.TABLES WHERE TABLE_TYPE = '$type' AND TABLE_SCHEMA = '{$this->database}' ORDER BY TABLE_NAME")->fetchAll(PDO::FETCH_ASSOC) as $table) {
            $tables[MySqlDriver::TYPE_TABLE][$table['TABLE_NAME']] = [
                'table' => $table['TABLE_NAME'],
                'engine' => $table['ENGINE'],
                'collation' => $table['TABLE_COLLATION'],
                'data_length' => $table['DATA_LENGTH'],
                'index_length' => $table['INDEX_LENGTH'],
                'data_free' => $table['DATA_FREE'],
                'autoincrement' => $table['AUTO_INCREMENT'],
                'rows' => $table['TABLE_ROWS'],
            ];
        }

        foreach ($this->connection->query("SELECT * FROM information_schema.VIEWS WHERE TABLE_SCHEMA = '{$this->database}' ORDER BY TABLE_NAME")->fetchAll(PDO::FETCH_ASSOC) as $view) {
            $tables[MySqlDriver::TYPE_VIEW][$view['TABLE_NAME']] = [
                'view' => $view['TABLE_NAME'],
                'check_option' => $view['CHECK_OPTION'],
                'is_updatable' => $view['IS_UPDATABLE'],
                'definer' => $view['DEFINER'],
                'security_type' => $view['SECURITY_TYPE'],
                'character_set' => $view['CHARACTER_SET_CLIENT'],
                'collation' => $view['COLLATION_CONNECTION'],
            ];
        }
        return [
            MySqlDriver::TYPE_TABLE => Multisort::sort($tables[MySqlDriver::TYPE_TABLE], $sorting),
            MySqlDriver::TYPE_VIEW => Multisort::sort($tables[MySqlDriver::TYPE_VIEW], $sorting),
        ];
    }

    public function itemsCount($type, $table, array $filter = [])
    {
        $query = sprintf('SELECT count(*) FROM `%s`', $table) . $this->createWhere($filter);
        return $this->connection->query($query)->fetch(PDO::FETCH_COLUMN);
    }

    public function items($type, $table, $page, $onPage, array $filter = [], array $sorting = [])
    {
        $primaryColumns = $this->getPrimaryColumns($type, $table);
        $query = sprintf('SELECT * FROM `%s`', $table);
        $query .= $this->createWhere($filter);
        $query .= $this->createOrderBy($sorting);
        $query .= ' LIMIT ' . (($page - 1) * $onPage) . ', ' . $onPage;
        $items = [];
        foreach ($this->connection->query($query)->fetchAll(PDO::FETCH_ASSOC) as $item) {
            $pk = [];
            foreach ($primaryColumns as $primaryColumn) {
                $pk[] = $item[$primaryColumn];
            }
            $items[md5(implode('|', $pk))] = $item;
        }
        return $items;
    }

    private function createWhere(array $filter)
    {
        if (empty($filter)) {
            return '';
        }

        $operatorsMap = [
            Filter::OPERATOR_EQUAL => '= %s',
            Filter::OPERATOR_GREATER_THAN => '> %s',
            Filter::OPERATOR_GREATER_THAN_OR_EQUAL => '>= %s',
            Filter::OPERATOR_LESS_THAN => '< %s',
            Filter::OPERATOR_LESS_THAN_OR_EQUAL => '<= %s',
            Filter::OPERATOR_NOT_EQUAL => '!= %s',
            Filter::OPERATOR_CONTAINS => 'LIKE "%%%s%%"',
            Filter::OPERATOR_NOT_CONTAINS => 'NOT LIKE "%%%s%%"',
            Filter::OPERATOR_STARTS_WITH => 'LIKE "%s%%"',
            Filter::OPERATOR_ENDS_WITH => 'LIKE "%%%s"',
            Filter::OPERATOR_IS_NULL => 'IS NULL',
            Filter::OPERATOR_IS_NOT_NULL => 'IS NOT NULL',
            Filter::OPERATOR_IS_IN => 'IN (%s)',
            Filter::OPERATOR_IS_NOT_IN => 'NOT IN (%s)',
        ];

        $where = ' WHERE ';
        $whereParts = [];
        foreach ($filter as $filterPart) {
            foreach ($filterPart as $key => $filterSettings) {
                foreach ($filterSettings as $operator => $value) {
                    if (!isset($operatorsMap[$operator])) {
                        throw new OperatorNotSupportedException('Operator "' . $operator . '" is not supported.');
                    }
                    $whereParts[] = "`$key` " . sprintf($operatorsMap[$operator], $value);
                }
            }
        }
        $where .= implode(' AND ', $whereParts);
        return $where;
    }

    private function createOrderBy(array $sorting)
    {
        if (empty($sorting)) {
            return '';
        }
        $orderBy = ' ORDER BY ';
        $order = [];
        foreach ($sorting as $sort) {
            foreach ($sort as $key => $direction) {
                $direction = strtolower($direction) == 'asc' ? 'ASC' : 'DESC';
                $order[] = "`$key` $direction";
            }
        }
        $orderBy .= implode(', ', $order);
        return $orderBy;
    }

    public function loadItem($type, $table, $item)
    {
        $primaryColumns = $this->getPrimaryColumns($type, $table);
        $query = sprintf('SELECT * FROM `%s` WHERE md5(concat(%s)) = "%s"', $table, implode(', "|", ', $primaryColumns), $item);
        return $this->connection->query($query)->fetch(PDO::FETCH_ASSOC);
    }

    public function deleteItem($type, $table, $item)
    {
        $primaryColumns = $this->getPrimaryColumns($type, $table);
        $query = sprintf('DELETE FROM `%s` WHERE md5(concat(%s)) = "%s"', $table, implode(', "|", ', $primaryColumns), $item);
        return $this->connection->query($query);
class Author {
    private $name;

    public function __construct($name) {
        $this->name = $name;
    }

    public function getName() {
        return $this->name;
    }
}

abstract class Post {
    public function getAuthor() {
        return 'Johannes';
    }
}

class BlogPost extends Post {
    public function getAuthor() {
        return new Author('Johannes');
    }
}

class ForumPost extends Post { /* ... */ }

function my_function(Post $post) {
    echo strtoupper($post->getAuthor());
}
    }

    public function deleteTable($type, $table)
    {
        if ($type === MySqlDriver::TYPE_TABLE) {
            $query = sprintf('DROP TABLE `%s`', $table);
        } elseif ($type === MySqlDriver::TYPE_VIEW) {
            $query = sprintf('DROP VIEW `%s`', $table);
        } else {
            throw new InvalidArgumentException('Type "' . $type . '" is not supported');
        }
        return $this->connection->query($query);
class Author {
    private $name;

    public function __construct($name) {
        $this->name = $name;
    }

    public function getName() {
        return $this->name;
    }
}

abstract class Post {
    public function getAuthor() {
        return 'Johannes';
    }
}

class BlogPost extends Post {
    public function getAuthor() {
        return new Author('Johannes');
    }
}

class ForumPost extends Post { /* ... */ }

function my_function(Post $post) {
    echo strtoupper($post->getAuthor());
}
    }

    public function deleteDatabase($database)
    {
        $query = sprintf('DROP DATABASE `%s`', $database);
        return $this->connection->query($query);
class Author {
    private $name;

    public function __construct($name) {
        $this->name = $name;
    }

    public function getName() {
        return $this->name;
    }
}

abstract class Post {
    public function getAuthor() {
        return 'Johannes';
    }
}

class BlogPost extends Post {
    public function getAuthor() {
        return new Author('Johannes');
    }
}

class ForumPost extends Post { /* ... */ }

function my_function(Post $post) {
    echo strtoupper($post->getAuthor());
}
    }

    public function selectDatabase($database)
    {
        $this->database = $database;
        $query = sprintf('USE `%s`', $database);
        $this->connection->query($query);
    }

    public function getPrimaryColumns($type, $table)
    {
        $primaryColumns = [];
        $columns = [];
        foreach ($this->getColumns($type, $table) as $column) {
            $columns[] = $column['Field'];
            if ($column['Key'] == 'PRI') {
                $primaryColumns[] = $column['Field'];
            }
        }
        if (empty($primaryColumns)) {
            $primaryColumns = $columns;
        }
        return $primaryColumns;
    }

    public function getColumns($type, $table)

    {
        if ($this->columns === null) {
            $columns = $this->connection->query(sprintf('SHOW FULL COLUMNS FROM `%s`', $table))->fetchAll(PDO::FETCH_ASSOC);
            $keys = [];
            foreach ($this->connection->query(sprintf('SELECT * FROM information_schema.KEY_COLUMN_USAGE WHERE TABLE_SCHEMA = "%s" AND TABLE_NAME = "%s"', $this->database, $table))->fetchAll(PDO::FETCH_ASSOC) as $key) {
                $keys[$key['COLUMN_NAME']] = $key;
            }
            $this->columns = [];
            foreach ($columns as $column) {
                $column['key_info'] = isset($keys[$column['Field']]) ? $keys[$column['Field']] : [];
                $this->columns[$column['Field']] = $column;
            }
        }
        return $this->columns;
    }

    public function execute($commands)
    {
        $queries = array_filter(array_map('trim', explode(';', $commands)), function ($query) {
            return $query;
        });
        $results = [];
        foreach ($queries as $query) {
            $results[$query]['headers'] = [];
            $statement = $this->connection->query($query);
            if (Strings::startsWith(strtolower($query), 'select ') || Strings::startsWith(strtolower($query), 'show ')) {
                $res = $statement->fetchAll(PDO::FETCH_ASSOC);
                $results[$query]['headers'] = array_keys(current($res));
                $results[$query]['items'] = $res;
                continue;
            }
            $results[$query] = (bool) $statement;
        }
        return $results;
    }
}


1		<?php
2
3		namespace UniMan\Drivers\MySql;
4
5		use UniMan\Core\DataManager\AbstractDataManager;
6		use UniMan\Core\Exception\OperatorNotSupportedException;
7		use UniMan\Core\Utils\Filter;
8		use UniMan\Core\Utils\Multisort;
9		use InvalidArgumentException;
10		use Nette\Utils\Strings;
11		use PDO;
12
13		class MySqlDataManager extends AbstractDataManager
14		{
15		private $columns = null;
16
17		private $connection;
18
19		private $database;
20
21		/**
22		* cache
23		* @var array\|null
24		*/
25		private $databases = null;
26
27	6	public function __construct(PDO $connection)
28		{
29	6	$this->connection = $connection;
30	6	}
31
32		public function databases(array $sorting = [])
33		{
34		if ($this->databases !== null) {
35		return $this->databases;
36		}
37
38		$query = 'SELECT information_schema.SCHEMATA.*, count(information_schema.TABLES.TABLE_NAME) AS tables_count, SUM(information_schema.TABLES.DATA_LENGTH) AS size
39		FROM information_schema.SCHEMATA
40		LEFT JOIN information_schema.TABLES ON information_schema.SCHEMATA.SCHEMA_NAME = information_schema.TABLES.TABLE_SCHEMA
41		GROUP BY information_schema.SCHEMATA.SCHEMA_NAME
42		ORDER BY information_schema.SCHEMATA.SCHEMA_NAME';
43
44		$databases = [];
45		foreach ($this->connection->query($query)->fetchAll(PDO::FETCH_ASSOC) as $database) {
46		$databases[$database['SCHEMA_NAME']] = [
47		'database' => $database['SCHEMA_NAME'],
48		'charset' => $database['DEFAULT_CHARACTER_SET_NAME'],
49		'collation' => $database['DEFAULT_COLLATION_NAME'],
50		'tables_count' => $database['tables_count'],
51		'size' => $database['size'] ?: 0,
52		];
53		}
54		$this->databases = $databases;
55		return Multisort::sort($databases, $sorting);
56		}
57
58		protected function getDatabaseNameColumn()
59		{
60		return 'database';
61		}
62
63		public function tables(array $sorting = [])
64		{
65		$tables = [
66		MySqlDriver::TYPE_TABLE => [],
67		MySqlDriver::TYPE_VIEW => [],
68		];
69		$type = 'BASE TABLE';
70		if ($this->database == 'information_schema') {
71		$type = 'SYSTEM VIEW';
72		}
73
74		foreach ($this->connection->query("SELECT * FROM information_schema.TABLES WHERE TABLE_TYPE = '$type' AND TABLE_SCHEMA = '{$this->database}' ORDER BY TABLE_NAME")->fetchAll(PDO::FETCH_ASSOC) as $table) {
75		$tables[MySqlDriver::TYPE_TABLE][$table['TABLE_NAME']] = [
76		'table' => $table['TABLE_NAME'],
77		'engine' => $table['ENGINE'],
78		'collation' => $table['TABLE_COLLATION'],
79		'data_length' => $table['DATA_LENGTH'],
80		'index_length' => $table['INDEX_LENGTH'],
81		'data_free' => $table['DATA_FREE'],
82		'autoincrement' => $table['AUTO_INCREMENT'],
83		'rows' => $table['TABLE_ROWS'],
84		];
85		}
86
87		foreach ($this->connection->query("SELECT * FROM information_schema.VIEWS WHERE TABLE_SCHEMA = '{$this->database}' ORDER BY TABLE_NAME")->fetchAll(PDO::FETCH_ASSOC) as $view) {
88		$tables[MySqlDriver::TYPE_VIEW][$view['TABLE_NAME']] = [
89		'view' => $view['TABLE_NAME'],
90		'check_option' => $view['CHECK_OPTION'],
91		'is_updatable' => $view['IS_UPDATABLE'],
92		'definer' => $view['DEFINER'],
93		'security_type' => $view['SECURITY_TYPE'],
94		'character_set' => $view['CHARACTER_SET_CLIENT'],
95		'collation' => $view['COLLATION_CONNECTION'],
96		];
97		}
98		return [
99		MySqlDriver::TYPE_TABLE => Multisort::sort($tables[MySqlDriver::TYPE_TABLE], $sorting),
100		MySqlDriver::TYPE_VIEW => Multisort::sort($tables[MySqlDriver::TYPE_VIEW], $sorting),
101		];
102		}
103
104		public function itemsCount($type, $table, array $filter = [])
105		{
106		$query = sprintf('SELECT count(*) FROM `%s`', $table) . $this->createWhere($filter);
107		return $this->connection->query($query)->fetch(PDO::FETCH_COLUMN);
108		}
109
110		public function items($type, $table, $page, $onPage, array $filter = [], array $sorting = [])
111		{
112		$primaryColumns = $this->getPrimaryColumns($type, $table);
113		$query = sprintf('SELECT * FROM `%s`', $table);
114		$query .= $this->createWhere($filter);
115		$query .= $this->createOrderBy($sorting);
116		$query .= ' LIMIT ' . (($page - 1) * $onPage) . ', ' . $onPage;
117		$items = [];
118		foreach ($this->connection->query($query)->fetchAll(PDO::FETCH_ASSOC) as $item) {
119		$pk = [];
120		foreach ($primaryColumns as $primaryColumn) {
121		$pk[] = $item[$primaryColumn];
122		}
123		$items[md5(implode('\|', $pk))] = $item;
124		}
125		return $items;
126		}
127
128		private function createWhere(array $filter)
129		{
130		if (empty($filter)) {
131		return '';
132		}
133
134		$operatorsMap = [
135		Filter::OPERATOR_EQUAL => '= %s',
136		Filter::OPERATOR_GREATER_THAN => '> %s',
137		Filter::OPERATOR_GREATER_THAN_OR_EQUAL => '>= %s',
138		Filter::OPERATOR_LESS_THAN => '< %s',
139		Filter::OPERATOR_LESS_THAN_OR_EQUAL => '<= %s',
140		Filter::OPERATOR_NOT_EQUAL => '!= %s',
141		Filter::OPERATOR_CONTAINS => 'LIKE "%%%s%%"',
142		Filter::OPERATOR_NOT_CONTAINS => 'NOT LIKE "%%%s%%"',
143		Filter::OPERATOR_STARTS_WITH => 'LIKE "%s%%"',
144		Filter::OPERATOR_ENDS_WITH => 'LIKE "%%%s"',
145		Filter::OPERATOR_IS_NULL => 'IS NULL',
146		Filter::OPERATOR_IS_NOT_NULL => 'IS NOT NULL',
147		Filter::OPERATOR_IS_IN => 'IN (%s)',
148		Filter::OPERATOR_IS_NOT_IN => 'NOT IN (%s)',
149		];
150
151		$where = ' WHERE ';
152		$whereParts = [];
153		foreach ($filter as $filterPart) {
154		foreach ($filterPart as $key => $filterSettings) {
155		foreach ($filterSettings as $operator => $value) {
156		if (!isset($operatorsMap[$operator])) {
157		throw new OperatorNotSupportedException('Operator "' . $operator . '" is not supported.');
158		}
159		$whereParts[] = "`$key` " . sprintf($operatorsMap[$operator], $value);
160		}
161		}
162		}
163		$where .= implode(' AND ', $whereParts);
164		return $where;
165		}
166
167		private function createOrderBy(array $sorting)
168		{
169		if (empty($sorting)) {
170		return '';
171		}
172		$orderBy = ' ORDER BY ';
173		$order = [];
174		foreach ($sorting as $sort) {
175		foreach ($sort as $key => $direction) {
176		$direction = strtolower($direction) == 'asc' ? 'ASC' : 'DESC';
177		$order[] = "`$key` $direction";
178		}
179		}
180		$orderBy .= implode(', ', $order);
181		return $orderBy;
182		}
183
184		public function loadItem($type, $table, $item)
185		{
186		$primaryColumns = $this->getPrimaryColumns($type, $table);
187		$query = sprintf('SELECT * FROM `%s` WHERE md5(concat(%s)) = "%s"', $table, implode(', "\|", ', $primaryColumns), $item);
188		return $this->connection->query($query)->fetch(PDO::FETCH_ASSOC);
189		}
190
191		public function deleteItem($type, $table, $item)
192		{
193		$primaryColumns = $this->getPrimaryColumns($type, $table);
194		$query = sprintf('DELETE FROM `%s` WHERE md5(concat(%s)) = "%s"', $table, implode(', "\|", ', $primaryColumns), $item);
195		return $this->connection->query($query);
		0 ignored issues – show Bug Best Practice introduced 2017-03-01 18:09 UTC by Report Bug Copy Issue Report The return type of `return $this->connection->query($query);` (`PDOStatement`) is incompatible with the return type declared by the interface `UniMan\Core\DataManager\...erInterface::deleteItem` of type `boolean\|null`. If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design. Let’s take a look at an example: class Author { private $name; public function __construct($name) { $this->name = $name; } public function getName() { return $this->name; } } abstract class Post { public function getAuthor() { return 'Johannes'; } } class BlogPost extends Post { public function getAuthor() { return new Author('Johannes'); } } class ForumPost extends Post { /* ... */ } function my_function(Post $post) { echo strtoupper($post->getAuthor()); } Our function `my_function` expects a `Post` object, and outputs the author of the post. The base class `Post` returns a simple string and outputting a simple string will work just fine. However, the child class `BlogPost` which is a sub-type of `Post` instead decided to return an `object`, and is therefore violating the SOLID principles. If a `BlogPost` were passed to `my_function`, PHP would not complain, but ultimately fail when executing the `strtoupper` call in its body. Loading history...
196		}
197
198		public function deleteTable($type, $table)
199		{
200		if ($type === MySqlDriver::TYPE_TABLE) {
201		$query = sprintf('DROP TABLE `%s`', $table);
202		} elseif ($type === MySqlDriver::TYPE_VIEW) {
203		$query = sprintf('DROP VIEW `%s`', $table);
204		} else {
205		throw new InvalidArgumentException('Type "' . $type . '" is not supported');
206		}
207		return $this->connection->query($query);
		0 ignored issues – show Bug Best Practice introduced 2017-03-01 18:09 UTC by Report Bug Copy Issue Report The return type of `return $this->connection->query($query);` (`PDOStatement`) is incompatible with the return type declared by the interface `UniMan\Core\DataManager\...rInterface::deleteTable` of type `boolean\|null`. If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design. Let’s take a look at an example: class Author { private $name; public function __construct($name) { $this->name = $name; } public function getName() { return $this->name; } } abstract class Post { public function getAuthor() { return 'Johannes'; } } class BlogPost extends Post { public function getAuthor() { return new Author('Johannes'); } } class ForumPost extends Post { /* ... */ } function my_function(Post $post) { echo strtoupper($post->getAuthor()); } Our function `my_function` expects a `Post` object, and outputs the author of the post. The base class `Post` returns a simple string and outputting a simple string will work just fine. However, the child class `BlogPost` which is a sub-type of `Post` instead decided to return an `object`, and is therefore violating the SOLID principles. If a `BlogPost` were passed to `my_function`, PHP would not complain, but ultimately fail when executing the `strtoupper` call in its body. Loading history...
208		}
209
210		public function deleteDatabase($database)
211		{
212		$query = sprintf('DROP DATABASE `%s`', $database);
213		return $this->connection->query($query);
		0 ignored issues – show Bug Best Practice introduced 2017-03-01 18:09 UTC by Report Bug Copy Issue Report The return type of `return $this->connection->query($query);` (`PDOStatement`) is incompatible with the return type declared by the interface `UniMan\Core\DataManager\...terface::deleteDatabase` of type `boolean\|null`. If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design. Let’s take a look at an example: class Author { private $name; public function __construct($name) { $this->name = $name; } public function getName() { return $this->name; } } abstract class Post { public function getAuthor() { return 'Johannes'; } } class BlogPost extends Post { public function getAuthor() { return new Author('Johannes'); } } class ForumPost extends Post { /* ... */ } function my_function(Post $post) { echo strtoupper($post->getAuthor()); } Our function `my_function` expects a `Post` object, and outputs the author of the post. The base class `Post` returns a simple string and outputting a simple string will work just fine. However, the child class `BlogPost` which is a sub-type of `Post` instead decided to return an `object`, and is therefore violating the SOLID principles. If a `BlogPost` were passed to `my_function`, PHP would not complain, but ultimately fail when executing the `strtoupper` call in its body. Loading history...
214		}
215
216		public function selectDatabase($database)
217		{
218		$this->database = $database;
219		$query = sprintf('USE `%s`', $database);
220		$this->connection->query($query);
221		}
222
223		public function getPrimaryColumns($type, $table)
224		{
225		$primaryColumns = [];
226		$columns = [];
227		foreach ($this->getColumns($type, $table) as $column) {
228		$columns[] = $column['Field'];
229		if ($column['Key'] == 'PRI') {
230		$primaryColumns[] = $column['Field'];
231		}
232		}
233		if (empty($primaryColumns)) {
234		$primaryColumns = $columns;
235		}
236		return $primaryColumns;
237		}
238
239		public function getColumns($type, $table)
		0 ignored issues – show Unused Code introduced 2016-12-19 15:38 UTC by Report Bug Copy Issue Report The parameter `$type` is not used and could be removed. This check looks from parameters that have been defined for a function or method, but which are not used in the method body. Loading history...
240		{
241		if ($this->columns === null) {
242		$columns = $this->connection->query(sprintf('SHOW FULL COLUMNS FROM `%s`', $table))->fetchAll(PDO::FETCH_ASSOC);
243		$keys = [];
244		foreach ($this->connection->query(sprintf('SELECT * FROM information_schema.KEY_COLUMN_USAGE WHERE TABLE_SCHEMA = "%s" AND TABLE_NAME = "%s"', $this->database, $table))->fetchAll(PDO::FETCH_ASSOC) as $key) {
245		$keys[$key['COLUMN_NAME']] = $key;
246		}
247		$this->columns = [];
248		foreach ($columns as $column) {
249		$column['key_info'] = isset($keys[$column['Field']]) ? $keys[$column['Field']] : [];
250		$this->columns[$column['Field']] = $column;
251		}
252		}
253		return $this->columns;
254		}
255
256		public function execute($commands)
257		{
258		$queries = array_filter(array_map('trim', explode(';', $commands)), function ($query) {
259		return $query;
260		});
261		$results = [];
262		foreach ($queries as $query) {
263		$results[$query]['headers'] = [];
264		$statement = $this->connection->query($query);
265		if (Strings::startsWith(strtolower($query), 'select ') \|\| Strings::startsWith(strtolower($query), 'show ')) {
266		$res = $statement->fetchAll(PDO::FETCH_ASSOC);
267		$results[$query]['headers'] = array_keys(current($res));
268		$results[$query]['items'] = $res;
269		continue;
270		}
271		$results[$query] = (bool) $statement;
272		}
273		return $results;
274		}
275		}
276

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MySqlDataManager::items() A

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