2 local setmetatable, getmetatable = setmetatable, getmetatable;
3 local ipairs, unpack, select = ipairs, table.unpack or unpack, select; --luacheck: ignore 113
4 local tonumber, tostring = tonumber, tostring;
5 local assert, xpcall, debug_traceback = assert, xpcall, debug.traceback;
6 local t_concat = table.concat;
7 local s_char = string.char;
8 local log = require "util.logger".init("sql");
10 local DBI = require "DBI";
11 -- This loads all available drivers while globals are unlocked
12 -- LuaDBI should be fixed to not set globals.
14 local build_url = require "socket.url".build;
24 local function is_column(x) return getmetatable(x)==column_mt; end
25 local function is_index(x) return getmetatable(x)==index_mt; end
26 local function is_table(x) return getmetatable(x)==table_mt; end
27 local function is_query(x) return getmetatable(x)==query_mt; end
28 local function Integer() return "Integer()" end
29 local function String() return "String()" end
31 local function Column(definition)
32 return setmetatable(definition, column_mt);
34 local function Table(definition)
36 for i,col in ipairs(definition) do
37 if is_column(col) then
38 c[i], c[col.name] = col, col;
39 elseif is_index(col) then
40 col.table = definition.name;
43 return setmetatable({ __table__ = definition, c = c, name = definition.name }, table_mt);
45 local function Index(definition)
46 return setmetatable(definition, index_mt);
49 function table_mt:__tostring()
50 local s = { 'name="'..self.__table__.name..'"' }
51 for i,col in ipairs(self.__table__) do
52 s[#s+1] = tostring(col);
54 return 'Table{ '..t_concat(s, ", ")..' }'
56 table_mt.__index = {};
57 function table_mt.__index:create(engine)
58 return engine:_create_table(self);
60 function table_mt:__call(...)
63 function column_mt:__tostring()
64 return 'Column{ name="'..self.name..'", type="'..self.type..'" }'
66 function index_mt:__tostring()
67 local s = 'Index{ name="'..self.name..'"';
68 for i=1,#self do s = s..', "'..self[i]:gsub("[\\\"]", "\\%1")..'"'; end
70 -- return 'Index{ name="'..self.name..'", type="'..self.type..'" }'
73 local function urldecode(s) return s and (s:gsub("%%(%x%x)", function (c) return s_char(tonumber(c,16)); end)); end
74 local function parse_url(url)
75 local scheme, secondpart, database = url:match("^([%w%+]+)://([^/]*)/?(.*)");
76 assert(scheme, "Invalid URL format");
77 local username, password, host, port;
78 local authpart, hostpart = secondpart:match("([^@]+)@([^@+])");
79 if not authpart then hostpart = secondpart; end
81 username, password = authpart:match("([^:]*):(.*)");
82 username = username or authpart;
83 password = password and urldecode(password);
86 host, port = hostpart:match("([^:]*):(.*)");
87 host = host or hostpart;
88 port = port and assert(tonumber(port), "Invalid URL format");
91 scheme = scheme:lower();
92 username = username; password = password;
93 host = host; port = port;
94 database = #database > 0 and database or nil;
99 function engine:connect()
100 if self.conn then return true; end
102 local params = self.params;
103 assert(params.driver, "no driver")
104 log("debug", "Connecting to [%s] %s...", params.driver, params.database);
105 local ok, dbh, err = pcall(DBI.Connect,
106 params.driver, params.database,
107 params.username, params.password,
108 params.host, params.port
110 if not ok then return ok, dbh; end
111 if not dbh then return nil, err; end
112 dbh:autocommit(false); -- don't commit automatically
115 local ok, err = self:set_encoding();
119 local ok, err = self:onconnect();
125 function engine:onconnect()
126 -- Override from create_engine()
129 function engine:prepquery(sql)
130 if self.params.driver == "PostgreSQL" then
131 sql = sql:gsub("`", "\"");
136 function engine:execute(sql, ...)
137 local success, err = self:connect();
138 if not success then return success, err; end
139 local prepared = self.prepared;
141 local stmt = prepared[sql];
144 stmt, err = self.conn:prepare(sql);
145 if not stmt then return stmt, err; end
146 prepared[sql] = stmt;
149 local success, err = stmt:execute(...);
150 if not success then return success, err; end
154 local result_mt = { __index = {
155 affected = function(self) return self.__stmt:affected(); end;
156 rowcount = function(self) return self.__stmt:rowcount(); end;
159 local function debugquery(where, sql, ...)
160 local i = 0; local a = {...}
161 log("debug", "[%s] %s", where, sql:gsub("%?", function () i = i + 1; local v = a[i]; if type(v) == "string" then v = ("%q"):format(v); end return tostring(v); end));
164 function engine:execute_query(sql, ...)
165 sql = self:prepquery(sql);
166 local stmt = assert(self.conn:prepare(sql));
167 assert(stmt:execute(...));
170 function engine:execute_update(sql, ...)
171 sql = self:prepquery(sql);
172 local prepared = self.prepared;
173 local stmt = prepared[sql];
175 stmt = assert(self.conn:prepare(sql));
176 prepared[sql] = stmt;
178 assert(stmt:execute(...));
179 return setmetatable({ __stmt = stmt }, result_mt);
181 engine.insert = engine.execute_update;
182 engine.select = engine.execute_query;
183 engine.delete = engine.execute_update;
184 engine.update = engine.execute_update;
185 local function debugwrap(name, f)
186 return function (self, sql, ...)
187 debugquery(name, sql, ...)
188 return f(self, sql, ...)
191 function engine:debug(enable)
192 self._debug = enable;
194 engine.insert = debugwrap("insert", engine.execute_update);
195 engine.select = debugwrap("select", engine.execute_query);
196 engine.delete = debugwrap("delete", engine.execute_update);
197 engine.update = debugwrap("update", engine.execute_update);
199 engine.insert = engine.execute_update;
200 engine.select = engine.execute_query;
201 engine.delete = engine.execute_update;
202 engine.update = engine.execute_update;
205 function engine:_transaction(func, ...)
206 if not self.conn then
207 local ok, err = self:connect();
208 if not ok then return ok, err; end
210 --assert(not self.__transaction, "Recursive transactions not allowed");
211 local args, n_args = {...}, select("#", ...);
212 local function f() return func(unpack(args, 1, n_args)); end
213 log("debug", "SQL transaction begin [%s]", tostring(func));
214 self.__transaction = true;
215 local success, a, b, c = xpcall(f, debug_traceback);
216 self.__transaction = nil;
218 log("debug", "SQL transaction success [%s]", tostring(func));
219 local ok, err = self.conn:commit();
220 if not ok then return ok, err; end -- commit failed
221 return success, a, b, c;
223 log("debug", "SQL transaction failure [%s]: %s", tostring(func), a);
224 if self.conn then self.conn:rollback(); end
228 function engine:transaction(...)
229 local ok, ret = self:_transaction(...);
231 local conn = self.conn;
232 if not conn or not conn:ping() then
234 ok, ret = self:_transaction(...);
239 function engine:_create_index(index)
240 local sql = "CREATE INDEX `"..index.name.."` ON `"..index.table.."` (";
242 sql = sql.."`"..index[i].."`";
243 if i ~= #index then sql = sql..", "; end
246 if self.params.driver == "PostgreSQL" then
247 sql = sql:gsub("`", "\"");
248 elseif self.params.driver == "MySQL" then
249 sql = sql:gsub("`([,)])", "`(20)%1");
252 sql = sql:gsub("^CREATE", "CREATE UNIQUE");
255 debugquery("create", sql);
257 return self:execute(sql);
259 function engine:_create_table(table)
260 local sql = "CREATE TABLE `"..table.name.."` (";
261 for i,col in ipairs(table.c) do
262 local col_type = col.type;
263 if col_type == "MEDIUMTEXT" and self.params.driver ~= "MySQL" then
264 col_type = "TEXT"; -- MEDIUMTEXT is MySQL-specific
266 if col.auto_increment == true and self.params.driver == "PostgreSQL" then
267 col_type = "BIGSERIAL";
269 sql = sql.."`"..col.name.."` "..col_type;
270 if col.nullable == false then sql = sql.." NOT NULL"; end
271 if col.primary_key == true then sql = sql.." PRIMARY KEY"; end
272 if col.auto_increment == true then
273 if self.params.driver == "MySQL" then
274 sql = sql.." AUTO_INCREMENT";
275 elseif self.params.driver == "SQLite3" then
276 sql = sql.." AUTOINCREMENT";
279 if i ~= #table.c then sql = sql..", "; end
282 if self.params.driver == "PostgreSQL" then
283 sql = sql:gsub("`", "\"");
284 elseif self.params.driver == "MySQL" then
285 sql = sql:gsub(";$", (" CHARACTER SET '%s' COLLATE '%s_bin';"):format(self.charset, self.charset));
288 debugquery("create", sql);
290 local success,err = self:execute(sql);
291 if not success then return success,err; end
292 for i,v in ipairs(table.__table__) do
294 self:_create_index(v);
299 function engine:set_encoding() -- to UTF-8
300 local driver = self.params.driver;
301 if driver == "SQLite3" then
302 return self:transaction(function()
303 for encoding in self:select"PRAGMA encoding;" do
304 if encoding[1] == "UTF-8" then
305 self.charset = "utf8";
310 local set_names_query = "SET NAMES '%s';"
311 local charset = "utf8";
312 if driver == "MySQL" then
313 self:transaction(function()
314 for row in self:select"SELECT `CHARACTER_SET_NAME` FROM `information_schema`.`CHARACTER_SETS` WHERE `CHARACTER_SET_NAME` LIKE 'utf8%' ORDER BY MAXLEN DESC LIMIT 1;" do
315 charset = row and row[1] or charset;
318 set_names_query = set_names_query:gsub(";$", (" COLLATE '%s';"):format(charset.."_bin"));
320 self.charset = charset;
321 log("debug", "Using encoding '%s' for database connection", charset);
322 local ok, err = self:transaction(function() return self:execute(set_names_query:format(charset)); end);
327 if driver == "MySQL" then
328 local ok, actual_charset = self:transaction(function ()
329 return self:select"SHOW SESSION VARIABLES LIKE 'character_set_client'";
332 for row in actual_charset do
333 if row[2] ~= charset then
334 log("error", "MySQL %s is actually %q (expected %q)", row[1], row[2], charset);
338 if not charset_ok then
339 return false, "Failed to set connection encoding";
345 local engine_mt = { __index = engine };
347 local function db2uri(params)
349 scheme = params.driver,
350 user = params.username,
351 password = params.password,
354 path = params.database,
358 local function create_engine(self, params, onconnect)
359 return setmetatable({ url = db2uri(params), params = params, onconnect = onconnect }, engine_mt);
363 is_column = is_column;
372 create_engine = create_engine;