support functions for database operations in Lua. currently includes simple…

support functions for database operations in Lua.  currently includes simple escaping functions for MySQL and Postgres database queries -- good to use with LuaSQL's ODBC driver, for example...

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk/contrib@15053 d0543943-73ff-0310-b7d9-9358b9ac24b2

hunmonk/lua/support_functions_database.lua

+--[[
+  Helper functions for database operations.
+]]
+
+--[[
+  Escapes special characters for the MySQL database.
+]]
+function mysql_escape(string_to_escape)
+  -- Single quote, double quote, backspace.
+  escaped_string, replacements = string.gsub(string_to_escape, "(['\"\\])", function(x) return "\\" .. x end)
+  -- Null byte.
+  escaped_string, replacements = string.gsub(escaped_string, "%z", "\\0")
+
+  return escaped_string
+end
+
+--[[
+  Escapes special characters for the Postgres database.
+]]
+function pgsql_escape(string_to_escape)
+  -- Single quote..
+  escaped_string, replacements = string.gsub(string_to_escape, "'", "''")
+  -- Null byte.
+  escaped_string, replacements = string.gsub(escaped_string, "%z", "")
+
+  return escaped_string
+end
+