Added IF NOT EXISTS flag to schema

db_schema.sql

 BEGIN TRANSACTION;
-CREATE TABLE `accesslog` (
+CREATE TABLE IF NOT EXISTS `accesslog` (
   `logfile` varchar(255) NOT NULL,
   `vhost` varchar(30) DEFAULT NULL,
   `path` varchar(255) NOT NULL,
@@ -9,14 +9,14 @@ CREATE TABLE `accesslog` (
   `volume` bigint(20) NOT NULL DEFAULT '0',
 	PRIMARY KEY (logfile, path, timestamp)
 );
-CREATE TABLE `areas` (
+CREATE TABLE IF NOT EXISTS `areas` (
   `area` varchar(20) NOT NULL PRIMARY KEY,
   `abbreviation` varchar(10) NOT NULL,
   `default` INTEGER NOT NULL DEFAULT '0',
   `rank` INTEGER DEFAULT NULL,
   `coordinates` varchar(30) NOT NULL
 );
-CREATE TABLE `changelog` (
+CREATE TABLE IF NOT EXISTS `changelog` (
 `id` INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
   `when` datetime NOT NULL,
   `who` INTEGER NOT NULL,
@@ -28,7 +28,7 @@ CREATE TABLE `changelog` (
   `value_new` text NOT NULL,
   `executed` text NOT NULL
 );
-CREATE TABLE `courses_data` (
+CREATE TABLE IF NOT EXISTS `courses_data` (
 `id` INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
   `visible` INTEGER NOT NULL,
   `listed` INTEGER NOT NULL DEFAULT '1',
@@ -51,13 +51,13 @@ CREATE TABLE `courses_data` (
   `responsible` text NOT NULL,
   `feed_url` text NOT NULL
 );
-CREATE TABLE `filesizes` (
+CREATE TABLE IF NOT EXISTS `filesizes` (
   `path` varchar(255) NOT NULL PRIMARY KEY,
   `size` bigint(20) NOT NULL DEFAULT '0',
   `duration` float DEFAULT NULL,
   `basename` varchar(255) NOT NULL
 );
-CREATE TABLE `formats` (
+CREATE TABLE IF NOT EXISTS `formats` (
 `id` INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
   `description` text NOT NULL,
   `keywords` text NOT NULL,
@@ -66,7 +66,7 @@ CREATE TABLE `formats` (
   `prio` INTEGER NOT NULL DEFAULT '0',
   `player_prio` INTEGER NOT NULL DEFAULT '0'
 );
-CREATE TABLE `lectures_data` (
+CREATE TABLE IF NOT EXISTS `lectures_data` (
 `id` INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
   `course_id` INTEGER NOT NULL,
   `visible` INTEGER NOT NULL DEFAULT '1',
@@ -86,20 +86,20 @@ CREATE TABLE `lectures_data` (
   `jumplist` text NOT NULL,
   `titlefile` varchar(255) NOT NULL
 );
-CREATE TABLE `places` (
+CREATE TABLE IF NOT EXISTS `places` (
   `place` varchar(20) NOT NULL PRIMARY KEY,
   `name` text NOT NULL,
   `area` varchar(20) NOT NULL,
   `campus_room` varchar(20) NOT NULL,
   `campus_name` varchar(30) NOT NULL
 );
-CREATE TABLE `site_texts` (
+CREATE TABLE IF NOT EXISTS `site_texts` (
   `key` varchar(64) NOT NULL PRIMARY KEY,
   `value` text NOT NULL,
   `modified_when` datetime NOT NULL,
   `modified_by` text NOT NULL
 );
-CREATE TABLE `streams` (
+CREATE TABLE IF NOT EXISTS `streams` (
   `handle` varchar(32) NOT NULL PRIMARY KEY,
   `active` INTEGER NOT NULL,
   `visible` INTEGER NOT NULL,
@@ -107,7 +107,7 @@ CREATE TABLE `streams` (
   `description` text NOT NULL,
   `poster` text NOT NULL
 );
-CREATE TABLE `stream_stats` (
+CREATE TABLE IF NOT EXISTS `stream_stats` (
 `id` INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
   `handle` varchar(32) NOT NULL,
   `lecture` INTEGER NOT NULL,
@@ -118,7 +118,7 @@ CREATE TABLE `stream_stats` (
   `hls_720p` INTEGER NOT NULL DEFAULT '0',
   `hls_360p` INTEGER NOT NULL DEFAULT '0'
 );
-CREATE TABLE `users` (
+CREATE TABLE IF NOT EXISTS `users` (
 `id` INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
   `name` varchar(32) NOT NULL,
   `realname` text NOT NULL,
@@ -128,7 +128,7 @@ CREATE TABLE `users` (
   `calendar_key` varchar(40) NOT NULL,
   `rfc6238` varchar(20) NOT NULL
 );
-CREATE TABLE `videos_data` (
+CREATE TABLE IF NOT EXISTS `videos_data` (
 `id` INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
   `lecture_id` INTEGER NOT NULL,
   `visible` INTEGER NOT NULL DEFAULT '1',
@@ -146,7 +146,7 @@ CREATE TABLE `videos_data` (
   `video_format` INTEGER NOT NULL,
   `hash` varchar(32) NOT NULL
 );
-CREATE VIEW `courses` AS select * from `courses_data` where (not(`courses_data`.`deleted`));
-CREATE VIEW `lectures` AS select * from `lectures_data` where (not(`lectures_data`.`deleted`));
-CREATE VIEW `videos` AS select * from `videos_data` where (not(`videos_data`.`deleted`));
+CREATE VIEW IF NOT EXISTS `courses` AS select * from `courses_data` where (not(`courses_data`.`deleted`));
+CREATE VIEW IF NOT EXISTS `lectures` AS select * from `lectures_data` where (not(`lectures_data`.`deleted`));
+CREATE VIEW IF NOT EXISTS `videos` AS select * from `videos_data` where (not(`videos_data`.`deleted`));
 COMMIT;