From a89d796f02699d2d16f99af021cc25d94e2ddf51 Mon Sep 17 00:00:00 2001
From: Sven Hoexter <sven@timegate.de>
Date: Sun, 5 Feb 2012 12:19:11 +0100
Subject: [PATCH] Add a mysql-proxy sample which mirrors inserts to a sqlite3
 db.

---
 mysql-proxy/query-mirror-sqlite3.lua | 29 ++++++++++++++++++++++++++++
 mysql-proxy/usage.txt                |  7 +++++++
 2 files changed, 36 insertions(+)
 create mode 100644 mysql-proxy/query-mirror-sqlite3.lua
 create mode 100644 mysql-proxy/usage.txt

diff --git a/mysql-proxy/query-mirror-sqlite3.lua b/mysql-proxy/query-mirror-sqlite3.lua
new file mode 100644
index 0000000..00818b1
--- /dev/null
+++ b/mysql-proxy/query-mirror-sqlite3.lua
@@ -0,0 +1,29 @@
+-- unfuck the cpath set by mysql-proxy and load sqlite3 driver
+package.cpath=package.cpath .. ";/usr/lib/i386-linux-gnu/lua/5.1/?.so"
+require "luasql.sqlite3"
+
+-- intercept mysql queries
+function read_query( packet )
+   if packet:byte() == proxy.COM_QUERY then
+      print("DEBUG: we got a normal query: " .. packet:sub(2))
+      local query = string.sub(packet, 2)
+
+      if string.match(string.upper(query), '^%s*INSERT') then
+	 print("DEBUG: found a query to process")
+	 -- create environment object
+	 local env = assert (luasql.sqlite3())
+	 -- connect to data source
+	 local con = assert (env:connect("mydb.sqlite3"))
+
+	 -- act on the database
+	 -- local cur = assert (con:execute(query))
+	 local cur = con:execute(query)
+
+	 -- closing time
+	 cur:close()
+	 con:close()
+	 env:close()
+      end
+   end
+end
+
diff --git a/mysql-proxy/usage.txt b/mysql-proxy/usage.txt
new file mode 100644
index 0000000..eeaf30b
--- /dev/null
+++ b/mysql-proxy/usage.txt
@@ -0,0 +1,7 @@
+mysql proxy startup command:
+
+mysql-proxy --admin-username=a --admin-password=b  --admin-lua-script=/usr/share/mysql-proxy/admin.lua --proxy-backend-addresses=127.0.0.1:3306 --proxy-lua-script=/home/sven/myscript.lua
+
+
+Introduction:
+http://www.oreillynet.com/pub/a/databases/2007/07/12/getting-started-with-mysql-proxy.html
-- 
2.39.2