DBI.Drivers();
local build_url = require "socket.url".build;
-module("sql")
+local _ENV = nil;
local column_mt = {};
local table_mt = {};
--local op_mt = {};
local index_mt = {};
-function is_column(x) return getmetatable(x)==column_mt; end
-function is_index(x) return getmetatable(x)==index_mt; end
-function is_table(x) return getmetatable(x)==table_mt; end
-function is_query(x) return getmetatable(x)==query_mt; end
-function Integer(n) return "Integer()" end
-function String(n) return "String()" end
+local function is_column(x) return getmetatable(x)==column_mt; end
+local function is_index(x) return getmetatable(x)==index_mt; end
+local function is_table(x) return getmetatable(x)==table_mt; end
+local function is_query(x) return getmetatable(x)==query_mt; end
+local function Integer(n) return "Integer()" end
+local function String(n) return "String()" end
-function Column(definition)
+local function Column(definition)
return setmetatable(definition, column_mt);
end
-function Table(definition)
+local function Table(definition)
local c = {}
for i,col in ipairs(definition) do
if is_column(col) then
end
return setmetatable({ __table__ = definition, c = c, name = definition.name }, table_mt);
end
-function Index(definition)
+local function Index(definition)
return setmetatable(definition, index_mt);
end
local params = self.params;
assert(params.driver, "no driver")
+ log("debug", "Connecting to [%s] %s...", params.driver, params.database);
local dbh, err = DBI.Connect(
params.driver, params.database,
params.username, params.password,
dbh:autocommit(false); -- don't commit automatically
self.conn = dbh;
self.prepared = {};
- self:set_encoding();
- self:onconnect();
+ local ok, err = self:set_encoding();
+ if not ok then
+ return ok, err;
+ end
+ local ok, err = self:onconnect();
+ if ok == false then
+ return ok, err;
+ end
return true;
end
function engine:onconnect()
--assert(not self.__transaction, "Recursive transactions not allowed");
local args, n_args = {...}, select("#", ...);
local function f() return func(unpack(args, 1, n_args)); end
+ log("debug", "SQL transaction begin [%s]", tostring(func));
self.__transaction = true;
local success, a, b, c = xpcall(f, debug_traceback);
self.__transaction = nil;
if self.params.driver == "PostgreSQL" then
sql = sql:gsub("`", "\"");
elseif self.params.driver == "MySQL" then
- sql = sql:gsub(";$", " CHARACTER SET 'utf8' COLLATE 'utf8_bin';");
+ sql = sql:gsub(";$", (" CHARACTER SET '%s' COLLATE '%s_bin';"):format(self.charset, self.charset));
end
local success,err = self:execute(sql);
if not success then return success,err; end
local set_names_query = "SET NAMES '%s';"
local charset = "utf8";
if driver == "MySQL" then
- set_names_query = set_names_query:gsub(";$", " COLLATE 'utf8_bin';");
local ok, charsets = self:transaction(function()
return self:select"SELECT `CHARACTER_SET_NAME` FROM `information_schema`.`CHARACTER_SETS` WHERE `CHARACTER_SET_NAME` LIKE 'utf8%' ORDER BY MAXLEN DESC LIMIT 1;";
end);
local row = ok and charsets();
charset = row and row[1] or charset;
+ set_names_query = set_names_query:gsub(";$", (" COLLATE '%s';"):format(charset.."_bin"));
end
self.charset = charset;
- return self:transaction(function() return self:execute(set_names_query:format(charset)); end);
+ log("debug", "Using encoding '%s' for database connection", charset);
+ local ok, err = self:transaction(function() return self:execute(set_names_query:format(charset)); end);
+ if not ok then
+ return ok, err;
+ end
+
+ if driver == "MySQL" then
+ local ok, actual_charset = self:transaction(function ()
+ return self:select"SHOW SESSION VARIABLES LIKE 'character_set_client'";
+ end);
+ for row in actual_charset do
+ if row[2] ~= charset then
+ log("error", "MySQL %s is actually %q (expected %q)", row[1], row[2], charset);
+ return false, "Failed to set connection encoding";
+ end
+ end
+ end
+
+ return true;
end
local engine_mt = { __index = engine };
-function db2uri(params)
+local function db2uri(params)
return build_url{
scheme = params.driver,
user = params.username,
};
end
-function create_engine(self, params, onconnect)
+local function create_engine(self, params, onconnect)
return setmetatable({ url = db2uri(params), params = params, onconnect = onconnect }, engine_mt);
end
-return _M;
+return {
+ is_column = is_column;
+ is_index = is_index;
+ is_table = is_table;
+ is_query = is_query;
+ Integer = Integer;
+ String = String;
+ Column = Column;
+ Table = Table;
+ Index = Index;
+ create_engine = create_engine;
+ db2uri = db2uri;
+};