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util/sql.lua

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util/sql.lua @ 5494:9916f0a2d178

mod_storage_sql2 (temporary name), sql.lib, util.sql: New SQL API supporting cross-module connection sharing, transactions and Things - a work in progress
author Matthew Wild <mwild1@gmail.com>
date Thu, 18 Apr 2013 11:13:40 +0100
child 5739:2e9ad9cb206f
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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32
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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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48
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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.__affected; end;
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181 rowcount = function(self) return self.__rowcount; end;
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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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202 assert(stmt:execute(...));
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203 return setmetatable({ __affected = stmt:affected(), __rowcount = stmt:rowcount() }, result_mt);
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204 end
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205 engine.insert = engine.execute_update;
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206 engine.select = engine.execute_query;
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207 engine.delete = engine.execute_update;
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208 engine.update = engine.execute_update;
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209 function engine:_transaction(func, ...)
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diff changeset
210 if not self.conn then
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211 local a,b = self:connect();
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212 if not a then return a,b; end
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213 end
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214 --assert(not self.__transaction, "Recursive transactions not allowed");
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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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217 self.__transaction = true;
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218 local success, a, b, c = xpcall(f, debug_traceback);
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219 self.__transaction = nil;
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220 if success then
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221 log("debug", "SQL transaction success [%s]", tostring(func));
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222 local ok, err = self.conn:commit();
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223 if not ok then return ok, err; end -- commit failed
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224 return success, a, b, c;
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225 else
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226 log("debug", "SQL transaction failure [%s]: %s", tostring(func), a);
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227 if self.conn then self.conn:rollback(); end
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228 return success, a;
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229 end
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230 end
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231 function engine:transaction(...)
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232 local a,b = self:_transaction(...);
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233 if not a then
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234 local conn = self.conn;
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235 if not conn or not conn:ping() then
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236 self.conn = nil;
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diff changeset
237 a,b = self:_transaction(...);
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238 end
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239 end
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240 return a,b;
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241 end
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242 function engine:_create_index(index)
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243 local sql = "CREATE INDEX `"..index.name.."` ON `"..index.table.."` (";
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diff changeset
244 for i=1,#index do
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245 sql = sql.."`"..index[i].."`";
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diff changeset
246 if i ~= #index then sql = sql..", "; end
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diff changeset
247 end
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diff changeset
248 sql = sql..");"
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diff changeset
249 if self.params.driver == "PostgreSQL" then
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250 sql = sql:gsub("`", "\"");
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diff changeset
251 elseif self.params.driver == "MySQL" then
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252 sql = sql:gsub("`([,)])", "`(20)%1");
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253 end
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diff changeset
254 --print(sql);
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255 return self:execute(sql);
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diff changeset
256 end
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diff changeset
257 function engine:_create_table(table)
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diff changeset
258 local sql = "CREATE TABLE `"..table.name.."` (";
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diff changeset
259 for i,col in ipairs(table.c) do
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diff changeset
260 sql = sql.."`"..col.name.."` "..col.type;
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diff changeset
261 if col.nullable == false then sql = sql.." NOT NULL"; end
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parents:
diff changeset
262 if i ~= #table.c then sql = sql..", "; end
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parents:
diff changeset
263 end
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parents:
diff changeset
264 sql = sql.. ");"
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parents:
diff changeset
265 if self.params.driver == "PostgreSQL" then
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parents:
diff changeset
266 sql = sql:gsub("`", "\"");
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parents:
diff changeset
267 end
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parents:
diff changeset
268 local success,err = self:execute(sql);
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parents:
diff changeset
269 if not success then return success,err; end
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parents:
diff changeset
270 for i,v in ipairs(table.__table__) do
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diff changeset
271 if is_index(v) then
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diff changeset
272 self:_create_index(v);
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diff changeset
273 end
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diff changeset
274 end
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diff changeset
275 return success;
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diff changeset
276 end
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diff changeset
277 local engine_mt = { __index = engine };
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diff changeset
278
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diff changeset
279 local function db2uri(params)
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diff changeset
280 return build_url{
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diff changeset
281 scheme = params.driver,
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diff changeset
282 user = params.username,
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diff changeset
283 password = params.password,
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diff changeset
284 host = params.host,
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diff changeset
285 port = params.port,
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diff changeset
286 path = params.database,
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diff changeset
287 };
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diff changeset
288 end
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diff changeset
289 local engine_cache = {}; -- TODO make weak valued
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diff changeset
290 function create_engine(self, params)
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diff changeset
291 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
292 if not engine_cache[url] then
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diff changeset
293 local engine = setmetatable({ url = url, params = params }, engine_mt);
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diff changeset
294 engine_cache[url] = engine;
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diff changeset
295 end
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diff changeset
296 return engine_cache[url];
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diff changeset
297 end
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parents:
diff changeset
298
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parents:
diff changeset
299
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diff changeset
300 --[[Users = Table {
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diff changeset
301 name="users";
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>
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302 Column { name="user_id", type=String(), primary_key=true };
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303 };
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304 print(Users)
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305 print(Users.c.user_id)]]
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306
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307 --local engine = create_engine('postgresql://scott:tiger@localhost:5432/mydatabase');
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308 --[[local engine = create_engine{ driver = "SQLite3", database = "./alchemy.sqlite" };
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309
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310 local i = 0;
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311 for row in assert(engine:execute("select * from sqlite_master")):rows(true) do
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312 i = i+1;
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313 print(i);
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314 for k,v in pairs(row) do
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315 print("",k,v);
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316 end
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317 end
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318 print("---")
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319
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320 Prosody = Table {
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321 name="prosody";
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322 Column { name="host", type="TEXT", nullable=false };
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323 Column { name="user", type="TEXT", nullable=false };
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324 Column { name="store", type="TEXT", nullable=false };
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325 Column { name="key", type="TEXT", nullable=false };
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326 Column { name="type", type="TEXT", nullable=false };
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327 Column { name="value", type="TEXT", nullable=false };
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328 Index { name="prosody_index", "host", "user", "store", "key" };
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329 };
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330 --print(Prosody);
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331 assert(engine:transaction(function()
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332 assert(Prosody:create(engine));
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333 end));
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334
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335 for row in assert(engine:execute("select user from prosody")):rows(true) do
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336 print("username:", row['username'])
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337 end
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338 --result.close();]]
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339
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340 return _M;