From 352fde7eedf72e652dc300bd99cd1326c98e8430 Mon Sep 17 00:00:00 2001
From: Alffd <allfd32123@gmail.com>
Date: Mon, 10 Jul 2017 20:59:03 -0400
Subject: [PATCH] SQL version control

---
 SQL/updates/Readme.md             |  7 +++++++
 code/__DEFINES/misc.dm            |  3 +++
 code/controllers/configuration.dm | 11 +++++++++++
 config/example/dbconfig.txt       |  8 +++++++-
 4 files changed, 28 insertions(+), 1 deletion(-)
 create mode 100644 SQL/updates/Readme.md

diff --git a/SQL/updates/Readme.md b/SQL/updates/Readme.md
new file mode 100644
index 00000000000..29d7ad0287a
--- /dev/null
+++ b/SQL/updates/Readme.md
@@ -0,0 +1,7 @@
+### UPDATING SQL
+The contents of this directory contain update sql scripts for the paracode SQL database.
+
+Files following the naming convention <old number>-<new number>.sql
+Files are designed to be run sequentialy, moving from version 2, to version 4 would require running the following SQL scripts.
+2-3.sql
+3-4.sql
\ No newline at end of file
diff --git a/code/__DEFINES/misc.dm b/code/__DEFINES/misc.dm
index 61e5e5069b4..1142f614775 100644
--- a/code/__DEFINES/misc.dm
+++ b/code/__DEFINES/misc.dm
@@ -347,3 +347,6 @@
 #define BLOOD_STATE_HUMAN			"blood"
 #define BLOOD_STATE_XENO			"xeno"
 #define BLOOD_STATE_NOT_BLOODY		"no blood whatsoever"
+
+// The SQL version required by this version of the code
+#define SQL_VERSION 0
diff --git a/code/controllers/configuration.dm b/code/controllers/configuration.dm
index 2ab267ce5a8..6fb873c9391 100644
--- a/code/controllers/configuration.dm
+++ b/code/controllers/configuration.dm
@@ -667,6 +667,7 @@
 
 /datum/configuration/proc/loadsql(filename)  // -- TLE
 	var/list/Lines = file2list(filename)
+	var/db_version = 0
 	for(var/t in Lines)
 		if(!t)	continue
 
@@ -704,8 +705,18 @@
 				sqlfdbkpass = value
 			if("feedback_tableprefix")
 				sqlfdbktableprefix = value
+			if("db_version")
+				db_version = text2num(value)
 			else
 				diary << "Unknown setting in configuration: '[name]'"
+	if(config.sql_enabled && db_version != SQL_VERSION)
+		config.sql_enabled = 0
+		diary << "WARNING: DB_CONFIG DEFINITION MISMATCH!"
+		spawn(60)
+			if(ticker.current_state == GAME_STATE_PREGAME)
+				going = 0
+				spawn(600)
+					to_chat(world, "<span class='alert'>DB_CONFIG MISMATCH, ROUND START DELAYED. <BR>Please check database version for recent upstream changes!</span>")
 
 /datum/configuration/proc/loadoverflowwhitelist(filename)
 	var/list/Lines = file2list(filename)
diff --git a/config/example/dbconfig.txt b/config/example/dbconfig.txt
index 4dd55974678..e713bda4c7d 100644
--- a/config/example/dbconfig.txt
+++ b/config/example/dbconfig.txt
@@ -5,6 +5,12 @@
 ## Should SQL be enabled? Uncomment to enable.
 #SQL_ENABLED
 
+## Database version.  This value is used if SQL_ENABLED is uncommented
+## This value must be set to the version of the paradise schema in use.
+## If this value does not match, the SQL database will not be loaded and an error will be generated.
+## Roundstart will be delayed.
+DB_VERSION 0
+
 ## Server the MySQL database can be found at.
 # Examples: localhost, 200.135.5.43, www.mysqldb.com, etc.
 ADDRESS localhost
@@ -30,4 +36,4 @@ FEEDBACK_TABLEPREFIX
 FEEDBACK_LOGIN username
 
 ## Password used to access the database.
-FEEDBACK_PASSWORD password
\ No newline at end of file
+FEEDBACK_PASSWORD password