<?php
$drivers["pgsql"] = "PostgreSQL";

if (isset($_GET["pgsql"])) {
	define("DRIVER", "pgsql");
	if (extension_loaded("pgsql")) {
		class Min_DB {
			var $extension = "PgSQL", $_link, $_result, $_string, $_database = true, $server_info, $affected_rows, $error, $timeout;

			function _error($errno, $error) {
				if (ini_bool("html_errors")) {
					$error = html_entity_decode(strip_tags($error));
				}
				$error = preg_replace('~^[^:]*: ~', '', $error);
				$this->error = $error;
			}

			function connect($server, $username, $password) {
				global $adminer;
				$db = $adminer->database();
				set_error_handler(array($this, '_error'));
				$this->_string = "host='" . str_replace(":", "' port='", addcslashes($server, "'\\")) . "' user='" . addcslashes($username, "'\\") . "' password='" . addcslashes($password, "'\\") . "'";
				$this->_link = @pg_connect("$this->_string dbname='" . ($db != "" ? addcslashes($db, "'\\") : "postgres") . "'", PGSQL_CONNECT_FORCE_NEW);
				if (!$this->_link && $db != "") {
					// try to connect directly with database for performance
					$this->_database = false;
					$this->_link = @pg_connect("$this->_string dbname='postgres'", PGSQL_CONNECT_FORCE_NEW);
				}
				restore_error_handler();
				if ($this->_link) {
					$version = pg_version($this->_link);
					$this->server_info = $version["server"];
					pg_set_client_encoding($this->_link, "UTF8");
				}
				return (bool) $this->_link;
			}

			function quote($string) {
				return "'" . pg_escape_string($this->_link, $string) . "'";
			}

			function value($val, $field) {
				return ($field["type"] == "bytea" && $val !== null ? pg_unescape_bytea($val) : $val);
			}

			function quoteBinary($string) {
				return "'" . pg_escape_bytea($this->_link, $string) . "'";
			}

			function select_db($database) {
				global $adminer;
				if ($database == $adminer->database()) {
					return $this->_database;
				}
				$return = @pg_connect("$this->_string dbname='" . addcslashes($database, "'\\") . "'", PGSQL_CONNECT_FORCE_NEW);
				if ($return) {
					$this->_link = $return;
				}
				return $return;
			}

			function close() {
				$this->_link = @pg_connect("$this->_string dbname='postgres'");
			}

			function query($query, $unbuffered = false) {
				$result = @pg_query($this->_link, $query);
				$this->error = "";
				if (!$result) {
					$this->error = pg_last_error($this->_link);
					$return = false;
				} elseif (!pg_num_fields($result)) {
					$this->affected_rows = pg_affected_rows($result);
					$return = true;
				} else {
					$return = new Min_Result($result);
				}
				if ($this->timeout) {
					$this->timeout = 0;
					$this->query("RESET statement_timeout");
				}
				return $return;
			}

			function multi_query($query) {
				return $this->_result = $this->query($query);
			}

			function store_result() {
				return $this->_result;
			}

			function next_result() {
				// PgSQL extension doesn't support multiple results
				return false;
			}

			function result($query, $field = 0) {
				$result = $this->query($query);
				if (!$result || !$result->num_rows) {
					return false;
				}
				return pg_fetch_result($result->_result, 0, $field);
			}

			function warnings() {
				return h(pg_last_notice($this->_link)); // second parameter is available since PHP 7.1.0
			}
		}

		class Min_Result {
			var $_result, $_offset = 0, $num_rows;

			function __construct($result) {
				$this->_result = $result;
				$this->num_rows = pg_num_rows($result);
			}

			function fetch_assoc() {
				return pg_fetch_assoc($this->_result);
			}

			function fetch_row() {
				return pg_fetch_row($this->_result);
			}

			function fetch_field() {
				$column = $this->_offset++;
				$return = new stdClass;
				if (function_exists('pg_field_table')) {
					$return->orgtable = pg_field_table($this->_result, $column);
				}
				$return->name = pg_field_name($this->_result, $column);
				$return->orgname = $return->name;
				$return->type = pg_field_type($this->_result, $column);
				$return->charsetnr = ($return->type == "bytea" ? 63 : 0); // 63 - binary
				return $return;
			}

			function __destruct() {
				pg_free_result($this->_result);
			}
		}

	} elseif (extension_loaded("pdo_pgsql")) {
		class Min_DB extends Min_PDO {
			var $extension = "PDO_PgSQL", $timeout;

			function connect($server, $username, $password) {
				global $adminer;
				$db = $adminer->database();
				$this->dsn("pgsql:host='" . str_replace(":", "' port='", addcslashes($server, "'\\")) . "' client_encoding=utf8 dbname='" . ($db != "" ? addcslashes($db, "'\\") : "postgres") . "'", $username, $password); //! client_encoding is supported since 9.1 but we can't yet use min_version here
				//! connect without DB in case of an error
				return true;
			}

			function select_db($database) {
				global $adminer;
				return ($adminer->database() == $database);
			}

			function quoteBinary($s) {
				return q($s);
			}

			function query($query, $unbuffered = false) {
				$return = parent::query($query, $unbuffered);
				if ($this->timeout) {
					$this->timeout = 0;
					parent::query("RESET statement_timeout");
				}
				return $return;
			}

			function warnings() {
				return ''; // not implemented in PDO_PgSQL as of PHP 7.2.1
			}

			function close() {
			}
		}

	}



	class Min_Driver extends Min_SQL {

		function insertUpdate($table, $rows, $primary) {
			global $connection;
			foreach ($rows as $set) {
				$update = array();
				$where = array();
				foreach ($set as $key => $val) {
					$update[] = "$key = $val";
					if (isset($primary[idf_unescape($key)])) {
						$where[] = "$key = $val";
					}
				}
				if (!(($where && queries("UPDATE " . table($table) . " SET " . implode(", ", $update) . " WHERE " . implode(" AND ", $where)) && $connection->affected_rows)
					|| queries("INSERT INTO " . table($table) . " (" . implode(", ", array_keys($set)) . ") VALUES (" . implode(", ", $set) . ")")
				)) {
					return false;
				}
			}
			return true;
		}

		function slowQuery($query, $timeout) {
			$this->_conn->query("SET statement_timeout = " . (1000 * $timeout));
			$this->_conn->timeout = 1000 * $timeout;
			return $query;
		}

		function convertSearch($idf, $val, $field) {
			return (preg_match('~char|text'
					. (!preg_match('~LIKE~', $val["op"]) ? '|date|time(stamp)?|boolean|uuid|' . number_type() : '')
					. '~', $field["type"])
				? $idf
				: "CAST($idf AS text)"
			);
		}

		function quoteBinary($s) {
			return $this->_conn->quoteBinary($s);
		}

		function warnings() {
			return $this->_conn->warnings();
		}

		function tableHelp($name) {
			$links = array(
				"information_schema" => "infoschema",
				"pg_catalog" => "catalog",
			);
			$link = $links[$_GET["ns"]];
			if ($link) {
				return "$link-" . str_replace("_", "-", $name) . ".html";
			}
		}

	}



	function idf_escape($idf) {
		return '"' . str_replace('"', '""', $idf) . '"';
	}

	function table($idf) {
		return idf_escape($idf);
	}

	function connect() {
		global $adminer, $types, $structured_types;
		$connection = new Min_DB;
		$credentials = $adminer->credentials();
		if ($connection->connect($credentials[0], $credentials[1], $credentials[2])) {
			if (min_version(9, 0, $connection)) {
				$connection->query("SET application_name = 'Adminer'");
				if (min_version(9.2, 0, $connection)) {
					$structured_types[lang('Strings')][] = "json";
					$types["json"] = 4294967295;
					if (min_version(9.4, 0, $connection)) {
						$structured_types[lang('Strings')][] = "jsonb";
						$types["jsonb"] = 4294967295;
					}
				}
			}
			return $connection;
		}
		return $connection->error;
	}

	function get_databases() {
		return get_vals("SELECT datname FROM pg_database WHERE has_database_privilege(datname, 'CONNECT') ORDER BY datname");
	}

	function limit($query, $where, $limit, $offset = 0, $separator = " ") {
		return " $query$where" . ($limit !== null ? $separator . "LIMIT $limit" . ($offset ? " OFFSET $offset" : "") : "");
	}

	function limit1($table, $query, $where, $separator = "\n") {
		return (preg_match('~^INTO~', $query)
			? limit($query, $where, 1, 0, $separator)
			: " $query" . (is_view(table_status1($table)) ? $where : $separator . "WHERE ctid = (SELECT ctid FROM " . table($table) . $where . $separator . "LIMIT 1)")
		);
	}

	function db_collation($db, $collations) {
		global $connection;
		return $connection->result("SELECT datcollate FROM pg_database WHERE datname = " . q($db));
	}

	function engines() {
		return array();
	}

	function logged_user() {
		global $connection;
		return $connection->result("SELECT user");
	}

	function tables_list() {
		$query = "SELECT table_name, table_type FROM information_schema.tables WHERE table_schema = current_schema()";
		if (support('materializedview')) { // ' - support("materializedview") could be removed by compile.php
			$query .= "
UNION ALL
SELECT matviewname, 'MATERIALIZED VIEW'
FROM pg_matviews
WHERE schemaname = current_schema()";
		}
		$query .= "
ORDER BY 1";
		return get_key_vals($query);
	}

	function count_tables($databases) {
		return array(); // would require reconnect
	}

	function table_status($name = "") {
		$return = array();
		foreach (get_rows("SELECT c.relname AS \"Name\", CASE c.relkind WHEN 'r' THEN 'table' WHEN 'm' THEN 'materialized view' ELSE 'view' END AS \"Engine\", pg_relation_size(c.oid) AS \"Data_length\", pg_total_relation_size(c.oid) - pg_relation_size(c.oid) AS \"Index_length\", obj_description(c.oid, 'pg_class') AS \"Comment\", " . (min_version(12) ? "''" : "CASE WHEN c.relhasoids THEN 'oid' ELSE '' END") . " AS \"Oid\", c.reltuples as \"Rows\", n.nspname
FROM pg_class c
JOIN pg_namespace n ON(n.nspname = current_schema() AND n.oid = c.relnamespace)
WHERE relkind IN ('r', 'm', 'v', 'f', 'p')
" . ($name != "" ? "AND relname = " . q($name) : "ORDER BY relname")
		) as $row) { //! Index_length, Auto_increment
			$return[$row["Name"]] = $row;
		}
		return ($name != "" ? $return[$name] : $return);
	}

	function is_view($table_status) {
		return in_array($table_status["Engine"], array("view", "materialized view"));
	}

	function fk_support($table_status) {
		return true;
	}

	function fields($table) {
		$return = array();
		$aliases = array(
			'timestamp without time zone' => 'timestamp',
			'timestamp with time zone' => 'timestamptz',
		);

		foreach (get_rows("SELECT a.attname AS field, format_type(a.atttypid, a.atttypmod) AS full_type, pg_get_expr(d.adbin, d.adrelid) AS default, a.attnotnull::int, col_description(c.oid, a.attnum) AS comment" . (min_version(10) ? ", a.attidentity" : "") . "
FROM pg_class c
JOIN pg_namespace n ON c.relnamespace = n.oid
JOIN pg_attribute a ON c.oid = a.attrelid
LEFT JOIN pg_attrdef d ON c.oid = d.adrelid AND a.attnum = d.adnum
WHERE c.relname = " . q($table) . "
AND n.nspname = current_schema()
AND NOT a.attisdropped
AND a.attnum > 0
ORDER BY a.attnum"
		) as $row) {
			//! collation, primary
			preg_match('~([^([]+)(\((.*)\))?([a-z ]+)?((\[[0-9]*])*)$~', $row["full_type"], $match);
			list(, $type, $length, $row["length"], $addon, $array) = $match;
			$row["length"] .= $array;
			$check_type = $type . $addon;
			if (isset($aliases[$check_type])) {
				$row["type"] = $aliases[$check_type];
				$row["full_type"] = $row["type"] . $length . $array;
			} else {
				$row["type"] = $type;
				$row["full_type"] = $row["type"] . $length . $addon . $array;
			}
			if (in_array($row['attidentity'], array('a', 'd'))) {
				$row['default'] = 'GENERATED ' . ($row['attidentity'] == 'd' ? 'BY DEFAULT' : 'ALWAYS') . ' AS IDENTITY';
			}
			$row["null"] = !$row["attnotnull"];
			$row["auto_increment"] = $row['attidentity'] || preg_match('~^nextval\(~i', $row["default"]);
			$row["privileges"] = array("insert" => 1, "select" => 1, "update" => 1, "where" => 1, "order" => 1);
			if (preg_match('~(.+)::[^,)]+(.*)~', $row["default"], $match)) {
				$row["default"] = ($match[1] == "NULL" ? null : idf_unescape($match[1]) . $match[2]);
			}
			$return[$row["field"]] = $row;
		}
		return $return;
	}

	function indexes($table, $connection2 = null) {
		global $connection;
		if (!is_object($connection2)) {
			$connection2 = $connection;
		}
		$return = array();
		$table_oid = $connection2->result("SELECT oid FROM pg_class WHERE relnamespace = (SELECT oid FROM pg_namespace WHERE nspname = current_schema()) AND relname = " . q($table));
		$columns = get_key_vals("SELECT attnum, attname FROM pg_attribute WHERE attrelid = $table_oid AND attnum > 0", $connection2);
		foreach (get_rows("SELECT relname, indisunique::int, indisprimary::int, indkey, indoption, (indpred IS NOT NULL)::int as indispartial FROM pg_index i, pg_class ci WHERE i.indrelid = $table_oid AND ci.oid = i.indexrelid", $connection2) as $row) {
			$relname = $row["relname"];
			$return[$relname]["type"] = ($row["indispartial"] ? "INDEX" : ($row["indisprimary"] ? "PRIMARY" : ($row["indisunique"] ? "UNIQUE" : "INDEX")));
			$return[$relname]["columns"] = array();
			foreach (explode(" ", $row["indkey"]) as $indkey) {
				$return[$relname]["columns"][] = $columns[$indkey];
			}
			$return[$relname]["descs"] = array();
			foreach (explode(" ", $row["indoption"]) as $indoption) {
				$return[$relname]["descs"][] = ($indoption & 1 ? '1' : null); // 1 - INDOPTION_DESC
			}
			$return[$relname]["lengths"] = array();
		}
		return $return;
	}

	function foreign_keys($table) {
		global $on_actions;
		$return = array();
		foreach (get_rows("SELECT conname, condeferrable::int AS deferrable, pg_get_constraintdef(oid) AS definition
FROM pg_constraint
WHERE conrelid = (SELECT pc.oid FROM pg_class AS pc INNER JOIN pg_namespace AS pn ON (pn.oid = pc.relnamespace) WHERE pc.relname = " . q($table) . " AND pn.nspname = current_schema())
AND contype = 'f'::char
ORDER BY conkey, conname") as $row) {
			if (preg_match('~FOREIGN KEY\s*\((.+)\)\s*REFERENCES (.+)\((.+)\)(.*)$~iA', $row['definition'], $match)) {
				$row['source'] = array_map('idf_unescape', array_map('trim', explode(',', $match[1])));
				if (preg_match('~^(("([^"]|"")+"|[^"]+)\.)?"?("([^"]|"")+"|[^"]+)$~', $match[2], $match2)) {
					$row['ns'] = idf_unescape($match2[2]);
					$row['table'] = idf_unescape($match2[4]);
				}
				$row['target'] = array_map('idf_unescape', array_map('trim', explode(',', $match[3])));
				$row['on_delete'] = (preg_match("~ON DELETE ($on_actions)~", $match[4], $match2) ? $match2[1] : 'NO ACTION');
				$row['on_update'] = (preg_match("~ON UPDATE ($on_actions)~", $match[4], $match2) ? $match2[1] : 'NO ACTION');
				$return[$row['conname']] = $row;
			}
		}
		return $return;
	}

	function constraints($table) {
		global $on_actions;
		$return = array();
		foreach (get_rows("SELECT conname, consrc
FROM pg_catalog.pg_constraint
INNER JOIN pg_catalog.pg_namespace ON pg_constraint.connamespace = pg_namespace.oid
INNER JOIN pg_catalog.pg_class ON pg_constraint.conrelid = pg_class.oid AND pg_constraint.connamespace = pg_class.relnamespace
WHERE pg_constraint.contype = 'c'
AND conrelid != 0 -- handle only CONSTRAINTs here, not TYPES
AND nspname = current_schema()
AND relname = " . q($table) . "
ORDER BY connamespace, conname") as $row) {
			$return[$row['conname']] = $row['consrc'];
		}
		return $return;
	}

	function view($name) {
		global $connection;
		return array("select" => trim($connection->result("SELECT pg_get_viewdef(" . $connection->result("SELECT oid FROM pg_class WHERE relnamespace = (SELECT oid FROM pg_namespace WHERE nspname = current_schema()) AND relname = " . q($name)) . ")")));
	}

	function collations() {
		//! supported in CREATE DATABASE
		return array();
	}

	function information_schema($db) {
		return ($db == "information_schema");
	}

	function error() {
		global $connection;
		$return = h($connection->error);
		if (preg_match('~^(.*\n)?([^\n]*)\n( *)\^(\n.*)?$~s', $return, $match)) {
			$return = $match[1] . preg_replace('~((?:[^&]|&[^;]*;){' . strlen($match[3]) . '})(.*)~', '\1<b>\2</b>', $match[2]) . $match[4];
		}
		return nl_br($return);
	}

	function create_database($db, $collation) {
		return queries("CREATE DATABASE " . idf_escape($db) . ($collation ? " ENCODING " . idf_escape($collation) : ""));
	}

	function drop_databases($databases) {
		global $connection;
		$connection->close();
		return apply_queries("DROP DATABASE", $databases, 'idf_escape');
	}

	function rename_database($name, $collation) {
		//! current database cannot be renamed
		return queries("ALTER DATABASE " . idf_escape(DB) . " RENAME TO " . idf_escape($name));
	}

	function auto_increment() {
		return "";
	}

	function alter_table($table, $name, $fields, $foreign, $comment, $engine, $collation, $auto_increment, $partitioning) {
		$alter = array();
		$queries = array();
		if ($table != "" && $table != $name) {
			$queries[] = "ALTER TABLE " . table($table) . " RENAME TO " . table($name);
		}
		foreach ($fields as $field) {
			$column = idf_escape($field[0]);
			$val = $field[1];
			if (!$val) {
				$alter[] = "DROP $column";
			} else {
				$val5 = $val[5];
				unset($val[5]);
				if ($field[0] == "") {
					if (isset($val[6])) { // auto_increment
						$val[1] = ($val[1] == " bigint" ? " big" : ($val[1] == " smallint" ? " small" : " ")) . "serial";
					}
					$alter[] = ($table != "" ? "ADD " : "  ") . implode($val);
					if (isset($val[6])) {
						$alter[] = ($table != "" ? "ADD" : " ") . " PRIMARY KEY ($val[0])";
					}
				} else {
					if ($column != $val[0]) {
						$queries[] = "ALTER TABLE " . table($name) . " RENAME $column TO $val[0]";
					}
					$alter[] = "ALTER $column TYPE$val[1]";
					if (!$val[6]) {
						$alter[] = "ALTER $column " . ($val[3] ? "SET$val[3]" : "DROP DEFAULT");
						$alter[] = "ALTER $column " . ($val[2] == " NULL" ? "DROP NOT" : "SET") . $val[2];
					}
				}
				if ($field[0] != "" || $val5 != "") {
					$queries[] = "COMMENT ON COLUMN " . table($name) . ".$val[0] IS " . ($val5 != "" ? substr($val5, 9) : "''");
				}
			}
		}
		$alter = array_merge($alter, $foreign);
		if ($table == "") {
			array_unshift($queries, "CREATE TABLE " . table($name) . " (\n" . implode(",\n", $alter) . "\n)");
		} elseif ($alter) {
			array_unshift($queries, "ALTER TABLE " . table($table) . "\n" . implode(",\n", $alter));
		}
		if ($comment !== null) {
			$queries[] = "COMMENT ON TABLE " . table($name) . " IS " . q($comment);
		}
		if ($auto_increment != "") {
			//! $queries[] = "SELECT setval(pg_get_serial_sequence(" . q($name) . ", ), $auto_increment)";
		}
		foreach ($queries as $query) {
			if (!queries($query)) {
				return false;
			}
		}
		return true;
	}

	function alter_indexes($table, $alter) {
		$create = array();
		$drop = array();
		$queries = array();
		foreach ($alter as $val) {
			if ($val[0] != "INDEX") {
				//! descending UNIQUE indexes results in syntax error
				$create[] = ($val[2] == "DROP"
					? "\nDROP CONSTRAINT " . idf_escape($val[1])
					: "\nADD" . ($val[1] != "" ? " CONSTRAINT " . idf_escape($val[1]) : "") . " $val[0] " . ($val[0] == "PRIMARY" ? "KEY " : "") . "(" . implode(", ", $val[2]) . ")"
				);
			} elseif ($val[2] == "DROP") {
				$drop[] = idf_escape($val[1]);
			} else {
				$queries[] = "CREATE INDEX " . idf_escape($val[1] != "" ? $val[1] : uniqid($table . "_")) . " ON " . table($table) . " (" . implode(", ", $val[2]) . ")";
			}
		}
		if ($create) {
			array_unshift($queries, "ALTER TABLE " . table($table) . implode(",", $create));
		}
		if ($drop) {
			array_unshift($queries, "DROP INDEX " . implode(", ", $drop));
		}
		foreach ($queries as $query) {
			if (!queries($query)) {
				return false;
			}
		}
		return true;
	}

	function truncate_tables($tables) {
		return queries("TRUNCATE " . implode(", ", array_map('table', $tables)));
		return true;
	}

	function drop_views($views) {
		return drop_tables($views);
	}

	function drop_tables($tables) {
		foreach ($tables as $table) {
				$status = table_status($table);
				if (!queries("DROP " . strtoupper($status["Engine"]) . " " . table($table))) {
					return false;
				}
		}
		return true;
	}

	function move_tables($tables, $views, $target) {
		foreach (array_merge($tables, $views) as $table) {
			$status = table_status($table);
			if (!queries("ALTER " . strtoupper($status["Engine"]) . " " . table($table) . " SET SCHEMA " . idf_escape($target))) {
				return false;
			}
		}
		return true;
	}

	function trigger($name, $table) {
		if ($name == "") {
			return array("Statement" => "EXECUTE PROCEDURE ()");
		}
		$columns = array();
		$where = "WHERE trigger_schema = current_schema() AND event_object_table = " . q($table) . " AND trigger_name = " . q($name);
		foreach (get_rows("SELECT * FROM information_schema.triggered_update_columns $where") as $row) {
			$columns[] = $row["event_object_column"];
		}
		$return = array();
		foreach (get_rows('SELECT trigger_name AS "Trigger", action_timing AS "Timing", event_manipulation AS "Event", \'FOR EACH \' || action_orientation AS "Type", action_statement AS "Statement" FROM information_schema.triggers ' . "$where ORDER BY event_manipulation DESC") as $row) {
			if ($columns && $row["Event"] == "UPDATE") {
				$row["Event"] .= " OF";
			}
			$row["Of"] = implode(", ", $columns);
			if ($return) {
				$row["Event"] .= " OR $return[Event]";
			}
			$return = $row;
		}
		return $return;
	}

	function triggers($table) {
		$return = array();
		foreach (get_rows("SELECT * FROM information_schema.triggers WHERE trigger_schema = current_schema() AND event_object_table = " . q($table)) as $row) {
			$trigger = trigger($row["trigger_name"], $table);
			$return[$trigger["Trigger"]] = array($trigger["Timing"], $trigger["Event"]);
		}
		return $return;
	}

	function trigger_options() {
		return array(
			"Timing" => array("BEFORE", "AFTER"),
			"Event" => array("INSERT", "UPDATE", "UPDATE OF", "DELETE", "INSERT OR UPDATE", "INSERT OR UPDATE OF", "DELETE OR INSERT", "DELETE OR UPDATE", "DELETE OR UPDATE OF", "DELETE OR INSERT OR UPDATE", "DELETE OR INSERT OR UPDATE OF"),
			"Type" => array("FOR EACH ROW", "FOR EACH STATEMENT"),
		);
	}

	function routine($name, $type) {
		$rows = get_rows('SELECT routine_definition AS definition, LOWER(external_language) AS language, *
FROM information_schema.routines
WHERE routine_schema = current_schema() AND specific_name = ' . q($name));
		$return = $rows[0];
		$return["returns"] = array("type" => $return["type_udt_name"]);
		$return["fields"] = get_rows('SELECT parameter_name AS field, data_type AS type, character_maximum_length AS length, parameter_mode AS inout
FROM information_schema.parameters
WHERE specific_schema = current_schema() AND specific_name = ' . q($name) . '
ORDER BY ordinal_position');
		return $return;
	}

	function routines() {
		return get_rows('SELECT specific_name AS "SPECIFIC_NAME", routine_type AS "ROUTINE_TYPE", routine_name AS "ROUTINE_NAME", type_udt_name AS "DTD_IDENTIFIER"
FROM information_schema.routines
WHERE routine_schema = current_schema()
ORDER BY SPECIFIC_NAME');
	}

	function routine_languages() {
		return get_vals("SELECT LOWER(lanname) FROM pg_catalog.pg_language");
	}

	function routine_id($name, $row) {
		$return = array();
		foreach ($row["fields"] as $field) {
			$return[] = $field["type"];
		}
		return idf_escape($name) . "(" . implode(", ", $return) . ")";
	}

	function last_id() {
		return 0; // there can be several sequences
	}

	function explain($connection, $query) {
		return $connection->query("EXPLAIN $query");
	}

	function found_rows($table_status, $where) {
		global $connection;
		if (preg_match(
			"~ rows=([0-9]+)~",
			$connection->result("EXPLAIN SELECT * FROM " . idf_escape($table_status["Name"]) . ($where ? " WHERE " . implode(" AND ", $where) : "")),
			$regs
		)) {
			return $regs[1];
		}
		return false;
	}

	function types() {
		return get_vals("SELECT typname
FROM pg_type
WHERE typnamespace = (SELECT oid FROM pg_namespace WHERE nspname = current_schema())
AND typtype IN ('b','d','e')
AND typelem = 0"
		);
	}

	function schemas() {
		return get_vals("SELECT nspname FROM pg_namespace ORDER BY nspname");
	}

	function get_schema() {
		global $connection;
		return $connection->result("SELECT current_schema()");
	}

	function set_schema($schema, $connection2 = null) {
		global $connection, $types, $structured_types;
		if (!$connection2) {
			$connection2 = $connection;
		}
		$return = $connection2->query("SET search_path TO " . idf_escape($schema));
		foreach (types() as $type) { //! get types from current_schemas('t')
			if (!isset($types[$type])) {
				$types[$type] = 0;
				$structured_types[lang('User types')][] = $type;
			}
		}
		return $return;
	}

	// create_sql() produces CREATE TABLE without FK CONSTRAINTs
	// foreign_keys_sql() produces all FK CONSTRAINTs as ALTER TABLE ... ADD CONSTRAINT
	// so that all FKs can be added after all tables have been created, avoiding any need to reorder CREATE TABLE statements in order of their FK dependencies
	function foreign_keys_sql($table) {
		$return = "";

		$status = table_status($table);
		$fkeys = foreign_keys($table);
		ksort($fkeys);

		foreach ($fkeys as $fkey_name => $fkey) {
			$return .= "ALTER TABLE ONLY " . idf_escape($status['nspname']) . "." . idf_escape($status['Name']) . " ADD CONSTRAINT " . idf_escape($fkey_name) . " $fkey[definition] " . ($fkey['deferrable'] ? 'DEFERRABLE' : 'NOT DEFERRABLE') . ";\n";
		}

		return ($return ? "$return\n" : $return);
	}

	function create_sql($table, $auto_increment, $style) {
		global $connection;
		$return = '';
		$return_parts = array();
		$sequences = array();

		$status = table_status($table);
		if (is_view($status)) {
			$view = view($table);
			return rtrim("CREATE VIEW " . idf_escape($table) . " AS $view[select]", ";");
		}
		$fields = fields($table);
		$indexes = indexes($table);
		ksort($indexes);
		$constraints = constraints($table);

		if (!$status || empty($fields)) {
			return false;
		}

		$return = "CREATE TABLE " . idf_escape($status['nspname']) . "." . idf_escape($status['Name']) . " (\n    ";

		// fields' definitions
		foreach ($fields as $field_name => $field) {
			$part = idf_escape($field['field']) . ' ' . $field['full_type']
				. default_value($field)
				. ($field['attnotnull'] ? " NOT NULL" : "");
			$return_parts[] = $part;

			// sequences for fields
			if (preg_match('~nextval\(\'([^\']+)\'\)~', $field['default'], $matches)) {
				$sequence_name = $matches[1];
				$sq = reset(get_rows(min_version(10)
					? "SELECT *, cache_size AS cache_value FROM pg_sequences WHERE schemaname = current_schema() AND sequencename = " . q($sequence_name)
					: "SELECT * FROM $sequence_name"
				));
				$sequences[] = ($style == "DROP+CREATE" ? "DROP SEQUENCE IF EXISTS $sequence_name;\n" : "")
					. "CREATE SEQUENCE $sequence_name INCREMENT $sq[increment_by] MINVALUE $sq[min_value] MAXVALUE $sq[max_value]" . ($auto_increment && $sq['last_value'] ? " START $sq[last_value]" : "") . " CACHE $sq[cache_value];";
			}
		}

		// adding sequences before table definition
		if (!empty($sequences)) {
			$return = implode("\n\n", $sequences) . "\n\n$return";
		}

		// primary + unique keys
		foreach ($indexes as $index_name => $index) {
			switch($index['type']) {
				case 'UNIQUE': $return_parts[] = "CONSTRAINT " . idf_escape($index_name) . " UNIQUE (" . implode(', ', array_map('idf_escape', $index['columns'])) . ")"; break;
				case 'PRIMARY': $return_parts[] = "CONSTRAINT " . idf_escape($index_name) . " PRIMARY KEY (" . implode(', ', array_map('idf_escape', $index['columns'])) . ")"; break;
			}
		}

		foreach ($constraints as $conname => $consrc) {
			$return_parts[] = "CONSTRAINT " . idf_escape($conname) . " CHECK $consrc";
		}

		$return .= implode(",\n    ", $return_parts) . "\n) WITH (oids = " . ($status['Oid'] ? 'true' : 'false') . ");";

		// "basic" indexes after table definition
		foreach ($indexes as $index_name => $index) {
			if ($index['type'] == 'INDEX') {
				$columns = array();
				foreach ($index['columns'] as $key => $val) {
					$columns[] = idf_escape($val) . ($index['descs'][$key] ? " DESC" : "");
				}
				$return .= "\n\nCREATE INDEX " . idf_escape($index_name) . " ON " . idf_escape($status['nspname']) . "." . idf_escape($status['Name']) . " USING btree (" . implode(', ', $columns) . ");";
			}
		}

		// coments for table & fields
		if ($status['Comment']) {
			$return .= "\n\nCOMMENT ON TABLE " . idf_escape($status['nspname']) . "." . idf_escape($status['Name']) . " IS " . q($status['Comment']) . ";";
		}

		foreach ($fields as $field_name => $field) {
			if ($field['comment']) {
				$return .= "\n\nCOMMENT ON COLUMN " . idf_escape($status['nspname']) . "." . idf_escape($status['Name']) . "." . idf_escape($field_name) . " IS " . q($field['comment']) . ";";
			}
		}

		return rtrim($return, ';');
	}

	function truncate_sql($table) {
		return "TRUNCATE " . table($table);
	}

	function trigger_sql($table) {
		$status = table_status($table);
		$return = "";
		foreach (triggers($table) as $trg_id => $trg) {
			$trigger = trigger($trg_id, $status['Name']);
			$return .= "\nCREATE TRIGGER " . idf_escape($trigger['Trigger']) . " $trigger[Timing] $trigger[Event] ON " . idf_escape($status["nspname"]) . "." . idf_escape($status['Name']) . " $trigger[Type] $trigger[Statement];;\n";
		}
		return $return;
	}


	function use_sql($database) {
		return "\connect " . idf_escape($database);
	}

	function show_variables() {
		return get_key_vals("SHOW ALL");
	}

	function process_list() {
		return get_rows("SELECT * FROM pg_stat_activity ORDER BY " . (min_version(9.2) ? "pid" : "procpid"));
	}

	function show_status() {
	}

	function convert_field($field) {
	}

	function unconvert_field($field, $return) {
		return $return;
	}

	function support($feature) {
		return preg_match('~^(database|table|columns|sql|indexes|descidx|comment|view|' . (min_version(9.3) ? 'materializedview|' : '') . 'scheme|routine|processlist|sequence|trigger|type|variables|drop_col|kill|dump)$~', $feature);
	}

	function kill_process($val) {
		return queries("SELECT pg_terminate_backend(" . number($val) . ")");
	}

	function connection_id(){
		return "SELECT pg_backend_pid()";
	}

	function max_connections() {
		global $connection;
		return $connection->result("SHOW max_connections");
	}

	function driver_config() {
		$types = array();
		$structured_types = array();
		foreach (array( //! arrays
			lang('Numbers') => array("smallint" => 5, "integer" => 10, "bigint" => 19, "boolean" => 1, "numeric" => 0, "real" => 7, "double precision" => 16, "money" => 20),
			lang('Date and time') => array("date" => 13, "time" => 17, "timestamp" => 20, "timestamptz" => 21, "interval" => 0),
			lang('Strings') => array("character" => 0, "character varying" => 0, "text" => 0, "tsquery" => 0, "tsvector" => 0, "uuid" => 0, "xml" => 0),
			lang('Binary') => array("bit" => 0, "bit varying" => 0, "bytea" => 0),
			lang('Network') => array("cidr" => 43, "inet" => 43, "macaddr" => 17, "txid_snapshot" => 0),
			lang('Geometry') => array("box" => 0, "circle" => 0, "line" => 0, "lseg" => 0, "path" => 0, "point" => 0, "polygon" => 0),
		) as $key => $val) { //! can be retrieved from pg_type
			$types += $val;
			$structured_types[$key] = array_keys($val);
		}
		return array(
			'possible_drivers' => array("PgSQL", "PDO_PgSQL"),
			'jush' => "pgsql",
			'types' => $types,
			'structured_types' => $structured_types,
			'unsigned' => array(),
			'operators' => array("=", "<", ">", "<=", ">=", "!=", "~", "~*", "!~", "!~*", "LIKE", "LIKE %%", "ILIKE", "ILIKE %%", "IN", "IS NULL", "NOT LIKE", "NOT IN", "IS NOT NULL"), // no "SQL" to avoid CSRF
			'operator_like' => "LIKE %%",
			'operator_regexp' => '~*',
			'functions' => array("char_length", "distinct", "lower", "round", "to_hex", "to_timestamp", "upper"),
			'grouping' => array("avg", "count", "count distinct", "max", "min", "sum"),
			'edit_functions' => array(
				array(
					"char" => "md5",
					"date|time" => "now",
				), array(
					number_type() => "+/-",
					"date|time" => "+ interval/- interval", //! escape
					"char|text" => "||",
				)
			),
		);
	}
}
