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253dfea0e3f6
util/sql.lua

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util/sql.lua @ 5744:253dfea0e3f6

util.sql: Do lazy fetching of affected/rowcount
author Kim Alvefur <zash@zash.se>
date Fri, 12 Jul 2013 17:44:30 +0200
parent 5743:8363dda76155
child 5776:bd0ff8ae98a8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
5494
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1
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2 local setmetatable, getmetatable = setmetatable, getmetatable;
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3 local ipairs, unpack, select = ipairs, unpack, select;
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4 local tonumber, tostring = tonumber, tostring;
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5 local assert, xpcall, debug_traceback = assert, xpcall, debug.traceback;
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6 local t_concat = table.concat;
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7 local s_char = string.char;
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8 local log = require "util.logger".init("sql");
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10 local DBI = require "DBI";
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11 -- This loads all available drivers while globals are unlocked
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12 -- LuaDBI should be fixed to not set globals.
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13 DBI.Drivers();
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14 local build_url = require "socket.url".build;
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16 module("sql")
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18 local column_mt = {};
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19 local table_mt = {};
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20 local query_mt = {};
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21 --local op_mt = {};
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22 local index_mt = {};
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24 function is_column(x) return getmetatable(x)==column_mt; end
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25 function is_index(x) return getmetatable(x)==index_mt; end
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26 function is_table(x) return getmetatable(x)==table_mt; end
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27 function is_query(x) return getmetatable(x)==query_mt; end
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28 --function is_op(x) return getmetatable(x)==op_mt; end
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29 --function expr(...) return setmetatable({...}, op_mt); end
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30 function Integer(n) return "Integer()" end
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31 function String(n) return "String()" end
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33 --[[local ops = {
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34 __add = function(a, b) return "("..a.."+"..b..")" end;
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35 __sub = function(a, b) return "("..a.."-"..b..")" end;
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36 __mul = function(a, b) return "("..a.."*"..b..")" end;
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37 __div = function(a, b) return "("..a.."/"..b..")" end;
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38 __mod = function(a, b) return "("..a.."%"..b..")" end;
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39 __pow = function(a, b) return "POW("..a..","..b..")" end;
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40 __unm = function(a) return "NOT("..a..")" end;
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41 __len = function(a) return "COUNT("..a..")" end;
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42 __eq = function(a, b) return "("..a.."=="..b..")" end;
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43 __lt = function(a, b) return "("..a.."<"..b..")" end;
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44 __le = function(a, b) return "("..a.."<="..b..")" end;
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45 };
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46
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47 local functions = {
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49 };
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50
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51 local cmap = {
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52 [Integer] = Integer();
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53 [String] = String();
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54 };]]
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55
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56 function Column(definition)
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57 return setmetatable(definition, column_mt);
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58 end
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59 function Table(definition)
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60 local c = {}
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61 for i,col in ipairs(definition) do
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62 if is_column(col) then
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63 c[i], c[col.name] = col, col;
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64 elseif is_index(col) then
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65 col.table = definition.name;
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66 end
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67 end
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68 return setmetatable({ __table__ = definition, c = c, name = definition.name }, table_mt);
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69 end
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70 function Index(definition)
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71 return setmetatable(definition, index_mt);
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72 end
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73
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74 function table_mt:__tostring()
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75 local s = { 'name="'..self.__table__.name..'"' }
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76 for i,col in ipairs(self.__table__) do
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77 s[#s+1] = tostring(col);
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78 end
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79 return 'Table{ '..t_concat(s, ", ")..' }'
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80 end
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81 table_mt.__index = {};
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82 function table_mt.__index:create(engine)
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83 return engine:_create_table(self);
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84 end
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85 function table_mt:__call(...)
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86 -- TODO
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87 end
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88 function column_mt:__tostring()
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89 return 'Column{ name="'..self.name..'", type="'..self.type..'" }'
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90 end
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91 function index_mt:__tostring()
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92 local s = 'Index{ name="'..self.name..'"';
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93 for i=1,#self do s = s..', "'..self[i]:gsub("[\\\"]", "\\%1")..'"'; end
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94 return s..' }';
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95 -- return 'Index{ name="'..self.name..'", type="'..self.type..'" }'
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96 end
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97 --
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98
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99 local function urldecode(s) return s and (s:gsub("%%(%x%x)", function (c) return s_char(tonumber(c,16)); end)); end
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100 local function parse_url(url)
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101 local scheme, secondpart, database = url:match("^([%w%+]+)://([^/]*)/?(.*)");
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102 assert(scheme, "Invalid URL format");
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103 local username, password, host, port;
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104 local authpart, hostpart = secondpart:match("([^@]+)@([^@+])");
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105 if not authpart then hostpart = secondpart; end
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106 if authpart then
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107 username, password = authpart:match("([^:]*):(.*)");
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108 username = username or authpart;
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109 password = password and urldecode(password);
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110 end
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111 if hostpart then
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112 host, port = hostpart:match("([^:]*):(.*)");
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113 host = host or hostpart;
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114 port = port and assert(tonumber(port), "Invalid URL format");
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115 end
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116 return {
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117 scheme = scheme:lower();
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118 username = username; password = password;
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119 host = host; port = port;
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120 database = #database > 0 and database or nil;
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121 };
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122 end
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123
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124 --[[local session = {};
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125
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126 function session.query(...)
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127 local rets = {...};
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128 local query = setmetatable({ __rets = rets, __filters }, query_mt);
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129 return query;
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130 end
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131 --
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132
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133 local function db2uri(params)
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134 return build_url{
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135 scheme = params.driver,
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136 user = params.username,
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137 password = params.password,
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138 host = params.host,
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139 port = params.port,
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140 path = params.database,
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141 };
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142 end]]
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143
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144 local engine = {};
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145 function engine:connect()
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146 if self.conn then return true; end
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147
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148 local params = self.params;
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149 assert(params.driver, "no driver")
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150 local dbh, err = DBI.Connect(
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151 params.driver, params.database,
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152 params.username, params.password,
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153 params.host, params.port
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154 );
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155 if not dbh then return nil, err; end
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156 dbh:autocommit(false); -- don't commit automatically
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157 self.conn = dbh;
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158 self.prepared = {};
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159 return true;
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160 end
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161 function engine:execute(sql, ...)
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162 local success, err = self:connect();
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163 if not success then return success, err; end
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164 local prepared = self.prepared;
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165
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166 local stmt = prepared[sql];
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167 if not stmt then
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168 local err;
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169 stmt, err = self.conn:prepare(sql);
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170 if not stmt then return stmt, err; end
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171 prepared[sql] = stmt;
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172 end
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173
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174 local success, err = stmt:execute(...);
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175 if not success then return success, err; end
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176 return stmt;
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177 end
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178
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179 local result_mt = { __index = {
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180 affected = function(self) return self.__stmt:affected(); end;
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181 rowcount = function(self) return self.__stmt:rowcount(); end;
5494
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182 } };
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183
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184 function engine:execute_query(sql, ...)
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185 if self.params.driver == "PostgreSQL" then
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186 sql = sql:gsub("`", "\"");
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187 end
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188 local stmt = assert(self.conn:prepare(sql));
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189 assert(stmt:execute(...));
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190 return stmt:rows();
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191 end
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192 function engine:execute_update(sql, ...)
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193 if self.params.driver == "PostgreSQL" then
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194 sql = sql:gsub("`", "\"");
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195 end
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196 local prepared = self.prepared;
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197 local stmt = prepared[sql];
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198 if not stmt then
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199 stmt = assert(self.conn:prepare(sql));
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200 prepared[sql] = stmt;
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201 end
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diff changeset
202 assert(stmt:execute(...));
5744
253dfea0e3f6 util.sql: Do lazy fetching of affected/rowcount
Kim Alvefur <zash@zash.se>
parents: 5743
diff changeset
203 return setmetatable({ __stmt = stmt }, result_mt);
5494
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204 end
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diff changeset
205 engine.insert = engine.execute_update;
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diff changeset
206 engine.select = engine.execute_query;
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diff changeset
207 engine.delete = engine.execute_update;
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diff changeset
208 engine.update = engine.execute_update;
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diff changeset
209 function engine:_transaction(func, ...)
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parents:
diff changeset
210 if not self.conn then
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diff changeset
211 local a,b = self:connect();
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diff changeset
212 if not a then return a,b; end
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parents:
diff changeset
213 end
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214 --assert(not self.__transaction, "Recursive transactions not allowed");
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diff changeset
215 local args, n_args = {...}, select("#", ...);
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216 local function f() return func(unpack(args, 1, n_args)); end
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parents:
diff changeset
217 self.__transaction = true;
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diff changeset
218 local success, a, b, c = xpcall(f, debug_traceback);
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diff changeset
219 self.__transaction = nil;
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diff changeset
220 if success then
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parents:
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221 log("debug", "SQL transaction success [%s]", tostring(func));
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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222 local ok, err = self.conn:commit();
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parents:
diff changeset
223 if not ok then return ok, err; end -- commit failed
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
224 return success, a, b, c;
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diff changeset
225 else
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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226 log("debug", "SQL transaction failure [%s]: %s", tostring(func), a);
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diff changeset
227 if self.conn then self.conn:rollback(); end
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parents:
diff changeset
228 return success, a;
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diff changeset
229 end
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230 end
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parents:
diff changeset
231 function engine:transaction(...)
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232 local a,b = self:_transaction(...);
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diff changeset
233 if not a then
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diff changeset
234 local conn = self.conn;
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parents:
diff changeset
235 if not conn or not conn:ping() then
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parents:
diff changeset
236 self.conn = nil;
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parents:
diff changeset
237 a,b = self:_transaction(...);
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diff changeset
238 end
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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diff changeset
239 end
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parents:
diff changeset
240 return a,b;
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diff changeset
241 end
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
242 function engine:_create_index(index)
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diff changeset
243 local sql = "CREATE INDEX `"..index.name.."` ON `"..index.table.."` (";
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
244 for i=1,#index do
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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diff changeset
245 sql = sql.."`"..index[i].."`";
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
246 if i ~= #index then sql = sql..", "; end
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
247 end
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parents:
diff changeset
248 sql = sql..");"
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parents:
diff changeset
249 if self.params.driver == "PostgreSQL" then
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parents:
diff changeset
250 sql = sql:gsub("`", "\"");
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
251 elseif self.params.driver == "MySQL" then
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
252 sql = sql:gsub("`([,)])", "`(20)%1");
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parents:
diff changeset
253 end
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parents:
diff changeset
254 --print(sql);
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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diff changeset
255 return self:execute(sql);
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parents:
diff changeset
256 end
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
257 function engine:_create_table(table)
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
258 local sql = "CREATE TABLE `"..table.name.."` (";
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
259 for i,col in ipairs(table.c) do
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
260 sql = sql.."`"..col.name.."` "..col.type;
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
261 if col.nullable == false then sql = sql.." NOT NULL"; end
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
262 if i ~= #table.c then sql = sql..", "; end
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
263 end
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
264 sql = sql.. ");"
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
265 if self.params.driver == "PostgreSQL" then
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
266 sql = sql:gsub("`", "\"");
5739
2e9ad9cb206f util.sql: Set charset and collation for MySQL when creating tables
Kim Alvefur <zash@zash.se>
parents: 5494
diff changeset
267 elseif self.params.driver == "MySQL" then
2e9ad9cb206f util.sql: Set charset and collation for MySQL when creating tables
Kim Alvefur <zash@zash.se>
parents: 5494
diff changeset
268 sql = sql:gsub(";$", " CHARACTER SET 'utf8' COLLATE 'utf8_bin';");
5494
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parents:
diff changeset
269 end
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
270 local success,err = self:execute(sql);
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
271 if not success then return success,err; end
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
272 for i,v in ipairs(table.__table__) do
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
273 if is_index(v) then
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
274 self:_create_index(v);
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parents:
diff changeset
275 end
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parents:
diff changeset
276 end
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
277 return success;
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
278 end
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
279 local engine_mt = { __index = engine };
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
280
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
281 local function db2uri(params)
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
282 return build_url{
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
283 scheme = params.driver,
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
284 user = params.username,
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
285 password = params.password,
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
286 host = params.host,
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
287 port = params.port,
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
288 path = params.database,
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
289 };
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
290 end
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parents:
diff changeset
291 local engine_cache = {}; -- TODO make weak valued
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
292 function create_engine(self, params)
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
293 local url = db2uri(params);
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
294 if not engine_cache[url] then
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
295 local engine = setmetatable({ url = url, params = params }, engine_mt);
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
296 engine_cache[url] = engine;
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
297 end
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
298 return engine_cache[url];
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
299 end
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
300
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
Matthew Wild <mwild1@gmail.com>
parents:
diff changeset
301
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
diff changeset
302 --[[Users = Table {
9916f0a2d178 mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
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parents:
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303 name="users";
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304 Column { name="user_id", type=String(), primary_key=true };
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305 };
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306 print(Users)
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307 print(Users.c.user_id)]]
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308
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309 --local engine = create_engine('postgresql://scott:tiger@localhost:5432/mydatabase');
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310 --[[local engine = create_engine{ driver = "SQLite3", database = "./alchemy.sqlite" };
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311
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312 local i = 0;
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313 for row in assert(engine:execute("select * from sqlite_master")):rows(true) do
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314 i = i+1;
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315 print(i);
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316 for k,v in pairs(row) do
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317 print("",k,v);
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318 end
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319 end
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320 print("---")
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321
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322 Prosody = Table {
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323 name="prosody";
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324 Column { name="host", type="TEXT", nullable=false };
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325 Column { name="user", type="TEXT", nullable=false };
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326 Column { name="store", type="TEXT", nullable=false };
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327 Column { name="key", type="TEXT", nullable=false };
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328 Column { name="type", type="TEXT", nullable=false };
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329 Column { name="value", type="TEXT", nullable=false };
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330 Index { name="prosody_index", "host", "user", "store", "key" };
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331 };
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332 --print(Prosody);
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333 assert(engine:transaction(function()
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334 assert(Prosody:create(engine));
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335 end));
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336
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337 for row in assert(engine:execute("select user from prosody")):rows(true) do
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338 print("username:", row['username'])
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339 end
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340 --result.close();]]
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341
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342 return _M;