From ab23338fe9f1b3ed21455867f1c032d7b146ceb8 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Mon, 2 Mar 2015 16:51:04 +0100
Subject: Initial Commit

---
 inc/database.inc.php | 128 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 inc/database.inc.php

(limited to 'inc/database.inc.php')

diff --git a/inc/database.inc.php b/inc/database.inc.php
new file mode 100644
index 0000000..efc330f
--- /dev/null
+++ b/inc/database.inc.php
@@ -0,0 +1,128 @@
+<?php
+
+/**
+ * Handle communication with the database
+ * This is a very thin layer between you and PDO.
+ */
+class Database
+{
+
+	/**
+	 *
+	 * @var \PDO Database handle
+	 */
+	private static $dbh = false;
+	private static $statements = array();
+	
+	/**
+	 * Get database schema version - used for checking for updates
+	 * @return int Version of db schema
+	 */
+	public static function getExpectedSchemaVersion()
+	{
+		return 9;
+	}
+	
+	public static function needSchemaUpdate()
+	{
+		return Property::getCurrentSchemaVersion() < self::getExpectedSchemaVersion();
+	}
+
+	/**
+	 * Connect to the DB if not already connected.
+	 */
+	private static function init()
+	{
+		if (self::$dbh !== false)
+			return;
+		try {
+			if (CONFIG_SQL_FORCE_UTF8)
+				self::$dbh = new PDO(CONFIG_SQL_DSN, CONFIG_SQL_USER, CONFIG_SQL_PASS, array(PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES utf8"));
+			else
+				self::$dbh = new PDO(CONFIG_SQL_DSN, CONFIG_SQL_USER, CONFIG_SQL_PASS);
+		} catch (PDOException $e) {
+			Util::traceError('Connecting to the local database failed: ' . $e->getMessage());
+		}
+	}
+
+	/**
+	 * If you just need the first row of a query you can use this.
+	 *
+	 * @return array|boolean Associative array representing row, or false if no row matches the query
+	 */
+	public static function queryFirst($query, $args = array(), $ignoreError = false)
+	{
+		$res = self::simpleQuery($query, $args, $ignoreError);
+		if ($res === false)
+			return false;
+		return $res->fetch(PDO::FETCH_ASSOC);
+	}
+
+
+	/**
+	 * Execute the given query and return the number of rows affected.
+	 * Mostly useful for UPDATEs or INSERTs
+	 * 
+	 * @param string $query Query to run
+	 * @param array $args Arguments to query
+	 * @param boolean $ignoreError Ignore query errors and just return false
+	 * @return int|boolean Number of rows affected, or false on error
+	 */
+	public static function exec($query, $args = array(), $ignoreError = false)
+	{
+		$res = self::simpleQuery($query, $args, $ignoreError);
+		if ($res === false)
+			return false;
+		return $res->rowCount();
+	}
+
+	/**
+	 * Get id (promary key) of last row inserted.
+	 * 
+	 * @return int the id
+	 */
+	public static function lastInsertId()
+	{
+		return self::$dbh->lastInsertId();
+	}
+
+	/**
+	 * Execute the given query and return the corresponding PDOStatement object
+	 * Note that this will re-use PDOStatements, so if you run the same
+	 * query again with different params, do not rely on the first PDOStatement
+	 * still being valid. If you need to do something fancy, use Database::prepare
+	 * @return \PDOStatement The query result object
+	 */
+	public static function simpleQuery($query, $args = array(), $ignoreError = false)
+	{
+		self::init();
+		try {
+			if (!isset(self::$statements[$query])) {
+				self::$statements[$query] = self::$dbh->prepare($query);
+			} else {
+				self::$statements[$query]->closeCursor();
+			}
+			if (self::$statements[$query]->execute($args) === false) {
+				if ($ignoreError)
+					return false;
+				Util::traceError("Database Error: \n" . implode("\n", self::$statements[$query]->errorInfo()));
+			}
+			return self::$statements[$query];
+		} catch (Exception $e) {
+				if ($ignoreError)
+					return false;
+				Util::traceError("Database Error: \n" . $e->getMessage());
+		}
+	}
+
+	/**
+	 * Simply calls PDO::prepare and returns the PDOStatement.
+	 * You must call PDOStatement::execute manually on it.
+	 */
+	public static function prepare($query)
+	{
+		self:init();
+		return self::$dbh->prepare($query);
+	}
+
+}
-- 
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