2 local setmetatable, getmetatable = setmetatable, getmetatable;
3 local ipairs, unpack, select = ipairs, unpack, select;
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 function is_column(x) return getmetatable(x)==column_mt; end
25 function is_index(x) return getmetatable(x)==index_mt; end
26 function is_table(x) return getmetatable(x)==table_mt; end
27 function is_query(x) return getmetatable(x)==query_mt; end
28 function Integer(n) return "Integer()" end
29 function String(n) return "String()" end
31 function Column(definition)
32 return setmetatable(definition, column_mt);
34 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 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 local dbh, err = DBI.Connect(
105 params.driver, params.database,
106 params.username, params.password,
107 params.host, params.port
109 if not dbh then return nil, err; end
110 dbh:autocommit(false); -- don't commit automatically
113 local ok, err = self:set_encoding();
117 local ok, err = self:onconnect();
123 function engine:onconnect()
124 -- Override from create_engine()
126 function engine:execute(sql, ...)
127 local success, err = self:connect();
128 if not success then return success, err; end
129 local prepared = self.prepared;
131 local stmt = prepared[sql];
134 stmt, err = self.conn:prepare(sql);
135 if not stmt then return stmt, err; end
136 prepared[sql] = stmt;
139 local success, err = stmt:execute(...);
140 if not success then return success, err; end
144 local result_mt = { __index = {
145 affected = function(self) return self.__stmt:affected(); end;
146 rowcount = function(self) return self.__stmt:rowcount(); end;
149 function engine:execute_query(sql, ...)
150 if self.params.driver == "PostgreSQL" then
151 sql = sql:gsub("`", "\"");
153 local stmt = assert(self.conn:prepare(sql));
154 assert(stmt:execute(...));
157 function engine:execute_update(sql, ...)
158 if self.params.driver == "PostgreSQL" then
159 sql = sql:gsub("`", "\"");
161 local prepared = self.prepared;
162 local stmt = prepared[sql];
164 stmt = assert(self.conn:prepare(sql));
165 prepared[sql] = stmt;
167 assert(stmt:execute(...));
168 return setmetatable({ __stmt = stmt }, result_mt);
170 engine.insert = engine.execute_update;
171 engine.select = engine.execute_query;
172 engine.delete = engine.execute_update;
173 engine.update = engine.execute_update;
174 function engine:_transaction(func, ...)
175 if not self.conn then
176 local ok, err = self:connect();
177 if not ok then return ok, err; end
179 --assert(not self.__transaction, "Recursive transactions not allowed");
180 local args, n_args = {...}, select("#", ...);
181 local function f() return func(unpack(args, 1, n_args)); end
182 self.__transaction = true;
183 local success, a, b, c = xpcall(f, debug_traceback);
184 self.__transaction = nil;
186 log("debug", "SQL transaction success [%s]", tostring(func));
187 local ok, err = self.conn:commit();
188 if not ok then return ok, err; end -- commit failed
189 return success, a, b, c;
191 log("debug", "SQL transaction failure [%s]: %s", tostring(func), a);
192 if self.conn then self.conn:rollback(); end
196 function engine:transaction(...)
197 local ok, ret = self:_transaction(...);
199 local conn = self.conn;
200 if not conn or not conn:ping() then
202 ok, ret = self:_transaction(...);
207 function engine:_create_index(index)
208 local sql = "CREATE INDEX `"..index.name.."` ON `"..index.table.."` (";
210 sql = sql.."`"..index[i].."`";
211 if i ~= #index then sql = sql..", "; end
214 if self.params.driver == "PostgreSQL" then
215 sql = sql:gsub("`", "\"");
216 elseif self.params.driver == "MySQL" then
217 sql = sql:gsub("`([,)])", "`(20)%1");
220 sql = sql:gsub("^CREATE", "CREATE UNIQUE");
223 return self:execute(sql);
225 function engine:_create_table(table)
226 local sql = "CREATE TABLE `"..table.name.."` (";
227 for i,col in ipairs(table.c) do
228 local col_type = col.type;
229 if col_type == "MEDIUMTEXT" and self.params.driver ~= "MySQL" then
230 col_type = "TEXT"; -- MEDIUMTEXT is MySQL-specific
232 if col.auto_increment == true and self.params.driver == "PostgreSQL" then
233 col_type = "BIGSERIAL";
235 sql = sql.."`"..col.name.."` "..col_type;
236 if col.nullable == false then sql = sql.." NOT NULL"; end
237 if col.primary_key == true then sql = sql.." PRIMARY KEY"; end
238 if col.auto_increment == true then
239 if self.params.driver == "MySQL" then
240 sql = sql.." AUTO_INCREMENT";
241 elseif self.params.driver == "SQLite3" then
242 sql = sql.." AUTOINCREMENT";
245 if i ~= #table.c then sql = sql..", "; end
248 if self.params.driver == "PostgreSQL" then
249 sql = sql:gsub("`", "\"");
250 elseif self.params.driver == "MySQL" then
251 sql = sql:gsub(";$", (" CHARACTER SET '%s' COLLATE '%s_bin';"):format(self.charset, self.charset));
253 local success,err = self:execute(sql);
254 if not success then return success,err; end
255 for i,v in ipairs(table.__table__) do
257 self:_create_index(v);
262 function engine:set_encoding() -- to UTF-8
263 local driver = self.params.driver;
264 if driver == "SQLite3" then
265 return self:transaction(function()
266 if self:select"PRAGMA encoding;"()[1] == "UTF-8" then
267 self.charset = "utf8";
271 local set_names_query = "SET NAMES '%s';"
272 local charset = "utf8";
273 if driver == "MySQL" then
274 local ok, charsets = self:transaction(function()
275 return self:select"SELECT `CHARACTER_SET_NAME` FROM `information_schema`.`CHARACTER_SETS` WHERE `CHARACTER_SET_NAME` LIKE 'utf8%' ORDER BY MAXLEN DESC LIMIT 1;";
277 local row = ok and charsets();
278 charset = row and row[1] or charset;
279 set_names_query = set_names_query:gsub(";$", (" COLLATE '%s';"):format(charset.."_bin"));
281 self.charset = charset;
282 log("debug", "Using encoding '%s' for database connection", charset);
283 local ok, err = self:transaction(function() return self:execute(set_names_query:format(charset)); end);
290 local engine_mt = { __index = engine };
292 function db2uri(params)
294 scheme = params.driver,
295 user = params.username,
296 password = params.password,
299 path = params.database,
303 function create_engine(self, params, onconnect)
304 return setmetatable({ url = db2uri(params), params = params, onconnect = onconnect }, engine_mt);