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
117 function engine:onconnect()
118 -- Override from create_engine()
120 function engine:execute(sql, ...)
121 local success, err = self:connect();
122 if not success then return success, err; end
123 local prepared = self.prepared;
125 local stmt = prepared[sql];
128 stmt, err = self.conn:prepare(sql);
129 if not stmt then return stmt, err; end
130 prepared[sql] = stmt;
133 local success, err = stmt:execute(...);
134 if not success then return success, err; end
138 local result_mt = { __index = {
139 affected = function(self) return self.__stmt:affected(); end;
140 rowcount = function(self) return self.__stmt:rowcount(); end;
143 function engine:execute_query(sql, ...)
144 if self.params.driver == "PostgreSQL" then
145 sql = sql:gsub("`", "\"");
147 local stmt = assert(self.conn:prepare(sql));
148 assert(stmt:execute(...));
151 function engine:execute_update(sql, ...)
152 if self.params.driver == "PostgreSQL" then
153 sql = sql:gsub("`", "\"");
155 local prepared = self.prepared;
156 local stmt = prepared[sql];
158 stmt = assert(self.conn:prepare(sql));
159 prepared[sql] = stmt;
161 assert(stmt:execute(...));
162 return setmetatable({ __stmt = stmt }, result_mt);
164 engine.insert = engine.execute_update;
165 engine.select = engine.execute_query;
166 engine.delete = engine.execute_update;
167 engine.update = engine.execute_update;
168 function engine:_transaction(func, ...)
169 if not self.conn then
170 local ok, err = self:connect();
171 if not ok then return ok, err; end
173 --assert(not self.__transaction, "Recursive transactions not allowed");
174 local args, n_args = {...}, select("#", ...);
175 local function f() return func(unpack(args, 1, n_args)); end
176 self.__transaction = true;
177 local success, a, b, c = xpcall(f, debug_traceback);
178 self.__transaction = nil;
180 log("debug", "SQL transaction success [%s]", tostring(func));
181 local ok, err = self.conn:commit();
182 if not ok then return ok, err; end -- commit failed
183 return success, a, b, c;
185 log("debug", "SQL transaction failure [%s]: %s", tostring(func), a);
186 if self.conn then self.conn:rollback(); end
190 function engine:transaction(...)
191 local ok, ret = self:_transaction(...);
193 local conn = self.conn;
194 if not conn or not conn:ping() then
196 ok, ret = self:_transaction(...);
201 function engine:_create_index(index)
202 local sql = "CREATE INDEX `"..index.name.."` ON `"..index.table.."` (";
204 sql = sql.."`"..index[i].."`";
205 if i ~= #index then sql = sql..", "; end
208 if self.params.driver == "PostgreSQL" then
209 sql = sql:gsub("`", "\"");
210 elseif self.params.driver == "MySQL" then
211 sql = sql:gsub("`([,)])", "`(20)%1");
214 sql = sql:gsub("^CREATE", "CREATE UNIQUE");
217 return self:execute(sql);
219 function engine:_create_table(table)
220 local sql = "CREATE TABLE `"..table.name.."` (";
221 for i,col in ipairs(table.c) do
222 local col_type = col.type;
223 if col_type == "MEDIUMTEXT" and self.params.driver ~= "MySQL" then
224 col_type = "TEXT"; -- MEDIUMTEXT is MySQL-specific
226 if col.auto_increment == true and self.params.driver == "PostgreSQL" then
227 col_type = "BIGSERIAL";
229 sql = sql.."`"..col.name.."` "..col_type;
230 if col.nullable == false then sql = sql.." NOT NULL"; end
231 if col.primary_key == true then sql = sql.." PRIMARY KEY"; end
232 if col.auto_increment == true then
233 if self.params.driver == "MySQL" then
234 sql = sql.." AUTO_INCREMENT";
235 elseif self.params.driver == "SQLite3" then
236 sql = sql.." AUTOINCREMENT";
239 if i ~= #table.c then sql = sql..", "; end
242 if self.params.driver == "PostgreSQL" then
243 sql = sql:gsub("`", "\"");
244 elseif self.params.driver == "MySQL" then
245 sql = sql:gsub(";$", " CHARACTER SET 'utf8' COLLATE 'utf8_bin';");
247 local success,err = self:execute(sql);
248 if not success then return success,err; end
249 for i,v in ipairs(table.__table__) do
251 self:_create_index(v);
256 function engine:set_encoding() -- to UTF-8
257 local driver = self.params.driver;
258 if driver == "SQLite3" then
259 return self:transaction(function()
260 if self:select"PRAGMA encoding;"()[1] == "UTF-8" then
261 self.charset = "utf8";
265 local set_names_query = "SET NAMES '%s';"
266 local charset = "utf8";
267 if driver == "MySQL" then
268 set_names_query = set_names_query:gsub(";$", " COLLATE 'utf8_bin';");
269 local ok, charsets = self:transaction(function()
270 return self:select"SELECT `CHARACTER_SET_NAME` FROM `information_schema`.`CHARACTER_SETS` WHERE `CHARACTER_SET_NAME` LIKE 'utf8%' ORDER BY MAXLEN DESC LIMIT 1;";
272 local row = ok and charsets();
273 charset = row and row[1] or charset;
275 self.charset = charset;
276 return self:transaction(function() return self:execute(set_names_query:format(charset)); end);
278 local engine_mt = { __index = engine };
280 function db2uri(params)
282 scheme = params.driver,
283 user = params.username,
284 password = params.password,
287 path = params.database,
291 function create_engine(self, params, onconnect)
292 return setmetatable({ url = db2uri(params), params = params, onconnect = onconnect }, engine_mt);