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<?php |
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/** |
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* @package CleverStyle Framework |
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* @author Nazar Mokrynskyi <[email protected]> |
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* @copyright Copyright (c) 2011-2016, Nazar Mokrynskyi |
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* @license MIT License, see license.txt |
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*/ |
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namespace cs\DB; |
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class PostgreSQL extends _Abstract { |
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/** |
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* @var resource DB connection handler |
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*/ |
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protected $handler; |
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/** |
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* @var resource |
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*/ |
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protected $query_result; |
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/** |
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* @inheritdoc |
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*/ |
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function __construct ($database, $user = '', $password = '', $host = 'localhost', $prefix = '') { |
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$start = microtime(true); |
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/** |
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* Parsing of $host variable, detecting port and persistent connection |
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*/ |
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list($host, $port, $persistent) = $this->get_host_port_and_persistent($host); |
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$connection_string = "host=$host port=$port dbname=$database user=$user password=$password options='--client_encoding=UTF8'"; |
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$this->handler = $persistent ? pg_connect($connection_string) : pg_pconnect($connection_string); |
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if (!is_resource($this->handler)) { |
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return; |
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} |
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$this->database = $database; |
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$this->connected = true; |
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$this->connecting_time = microtime(true) - $start; |
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$this->db_type = 'postgresql'; |
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$this->prefix = $prefix; |
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} |
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/** |
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* Parse host string into host, port and persistent separately |
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* |
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* Understands `p:` prefix for persistent connections |
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* |
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* @param string $host_string |
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* |
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* @return array |
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*/ |
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protected function get_host_port_and_persistent ($host_string) { |
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$host = explode(':', $host_string); |
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$port = 5432; |
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$persistent = false; |
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switch (count($host)) { |
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case 1: |
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$host = $host[0]; |
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break; |
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case 2: |
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if ($host[0] == 'p') { |
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$persistent = true; |
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$host = $host[1]; |
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} else { |
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list($host, $port) = $host; |
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} |
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break; |
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case 3: |
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$persistent = true; |
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list(, $host, $port) = $host; |
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} |
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return [$host, $port, $persistent]; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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function q ($query, $params = [], ...$param) { |
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// Hack to convert small subset of MySQL queries into PostgreSQL-compatible syntax |
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$query = str_replace('`', '"', $query); |
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$query = preg_replace_callback( |
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'/(INSERT IGNORE INTO|REPLACE INTO)(.+)(;|$)/Uis', |
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function ($matches) { |
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// Only support simplest cases |
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if (stripos($matches[2], 'on duplicate')) { |
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return $matches[0]; |
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} |
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switch (strtoupper($matches[1])) { |
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case 'INSERT IGNORE INTO': |
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return "INSERT INTO $matches[2] ON CONFLICT DO NOTHING$matches[3]"; |
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case 'REPLACE INTO': |
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$table_name = substr( |
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$matches[2], |
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strpos($matches[2], '"') + 1 |
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); |
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$table_name = substr( |
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$table_name, |
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0, |
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strpos($table_name, '"') |
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); |
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$update = preg_replace_callback( |
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'/"([^"]+)"/', |
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function ($matches) { |
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return "\"$matches[1]\" = EXCLUDED.\"$matches[1]\""; |
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}, |
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substr( |
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strstr($matches[2], ')', true), |
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strpos($matches[2], '(') + 1 |
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) |
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); |
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// Only support constraint named as table with `_primary` prefix |
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return "INSERT INTO $matches[2] ON CONFLICT ON CONSTRAINT \"{$table_name}_primary\" DO UPDATE SET $update$matches[3]"; |
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} |
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}, |
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$query |
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); |
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return parent::q(...([$query] + func_get_args())); |
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} |
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/** |
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* @inheritdoc |
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* |
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* @return false|resource |
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*/ |
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protected function q_internal ($query) { |
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if (!$query) { |
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return false; |
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} |
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return $this->query_result = pg_query($this->handler, $query); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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protected function q_multi_internal ($query) { |
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return $this->q_internal(implode(';', $query)); |
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} |
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/** |
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* @inheritdoc |
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* |
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* @param false|resource $query_result |
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*/ |
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function f ($query_result, $single_column = false, $array = false, $indexed = false) { |
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if (!is_resource($query_result)) { |
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return false; |
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} |
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$result_type = $single_column || $indexed ? PGSQL_NUM : PGSQL_ASSOC; |
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if ($array) { |
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$result = []; |
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while ($current = pg_fetch_array($query_result, null, $result_type)) { |
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$result[] = $single_column ? $current[0] : $current; |
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} |
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$this->free($query_result); |
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return $result; |
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} |
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$result = pg_fetch_array($query_result, null, $result_type); |
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return $single_column && $result ? $result[0] : $result; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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function id () { |
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return (int)$this->qfs('SELECT lastval()'); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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function affected () { |
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return is_resource($this->query_result) ? pg_affected_rows($this->query_result) : 0; |
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} |
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/** |
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* @inheritdoc |
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* |
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* @param false|resource $query_result |
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*/ |
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function free ($query_result) { |
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if (is_resource($query_result)) { |
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return pg_free_result($query_result); |
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} |
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return true; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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function columns ($table, $like = false) { |
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if (!$table) { |
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return false; |
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} |
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if ($like) { |
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$like = $this->s($like); |
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$columns = $this->qfas( |
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"SELECT `column_name` |
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FROM `information_schema`.`columns` |
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WHERE |
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`table_name` = '$table' AND |
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`column_name` LIKE $like" |
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) ?: []; |
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} else { |
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$columns = $this->qfas( |
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"SELECT `column_name` |
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FROM `information_schema`.`columns` |
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WHERE `table_name` = '$table'" |
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) ?: []; |
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} |
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return $columns; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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function tables ($like = false) { |
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if ($like) { |
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$like = $this->s($like); |
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return $this->qfas( |
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"SELECT `table_name` |
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FROM `information_schema`.`tables` |
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WHERE |
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`table_schema` = 'public' AND |
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`table_name` LIKE $like |
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ORDER BY `table_name` ASC" |
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) ?: []; |
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} else { |
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return $this->qfas( |
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"SELECT `table_name` |
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FROM `information_schema`.`tables` |
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WHERE `table_schema` = 'public' |
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ORDER BY `table_name` ASC" |
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) ?: []; |
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} |
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} |
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/** |
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* @inheritdoc |
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*/ |
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protected function s_internal ($string, $single_quotes_around) { |
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return $single_quotes_around ? pg_escape_literal($this->handler, $string) : pg_escape_string($this->handler, $string); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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function server () { |
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return $this->handler->server_info; |
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} |
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/** |
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* @inheritdoc |
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*/ |
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function __destruct () { |
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if ($this->connected && is_resource($this->handler)) { |
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pg_close($this->handler); |
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$this->connected = false; |
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} |
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} |
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} |
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nazar-pc /
CleverStyle-Framework
