prosody
e748d29b18d6
plugins/storage/sqlbasic.lib.lua

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plugins/storage/sqlbasic.lib.lua @ 3913:e748d29b18d6

mod_pubsub: Fix capabilities table from some debugging
author Matthew Wild <mwild1@gmail.com>
date Tue, 21 Dec 2010 03:30:18 +0000
parent 2678:c5882e2e12b5
child 5021:85b2689dbcfe
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2678
c5882e2e12b5 mod_storage, plus a bit of SQL and XML.
Waqas Hussain <waqas20@gmail.com>
parents:
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1
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2 -- Basic SQL driver
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3 -- This driver stores data as simple key-values
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4
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5 local ser = require "util.serialization".serialize;
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6 local deser = function(data)
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7 module:log("debug", "deser: %s", tostring(data));
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8 if not data then return nil; end
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9 local f = loadstring("return "..data);
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10 if not f then return nil; end
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11 setfenv(f, {});
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12 local s, d = pcall(f);
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13 if not s then return nil; end
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14 return d;
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15 end;
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16
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17 local driver = {};
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18 driver.__index = driver;
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19
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20 driver.item_table = "item";
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21 driver.list_table = "list";
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22
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23 function driver:prepare(sql)
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24 module:log("debug", "query: %s", sql);
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25 local err;
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26 if not self.sqlcache then self.sqlcache = {}; end
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27 local r = self.sqlcache[sql];
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28 if r then return r; end
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29 r, err = self.connection:prepare(sql);
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30 if not r then error("Unable to prepare SQL statement: "..err); end
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31 self.sqlcache[sql] = r;
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32 return r;
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33 end
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34
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35 function driver:load(username, host, datastore)
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36 local select = self:prepare("select data from "..self.item_table.." where username=? and host=? and datastore=?");
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37 select:execute(username, host, datastore);
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38 local row = select:fetch();
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39 return row and deser(row[1]) or nil;
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40 end
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41
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42 function driver:store(username, host, datastore, data)
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43 if not data or next(data) == nil then
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44 local delete = self:prepare("delete from "..self.item_table.." where username=? and host=? and datastore=?");
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45 delete:execute(username, host, datastore);
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46 return true;
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47 else
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48 local d = self:load(username, host, datastore);
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49 if d then -- update
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50 local update = self:prepare("update "..self.item_table.." set data=? where username=? and host=? and datastore=?");
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51 return update:execute(ser(data), username, host, datastore);
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52 else -- insert
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53 local insert = self:prepare("insert into "..self.item_table.." values (?, ?, ?, ?)");
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54 return insert:execute(username, host, datastore, ser(data));
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55 end
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56 end
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Waqas Hussain <waqas20@gmail.com>
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57 end
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58
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59 function driver:list_append(username, host, datastore, data)
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60 if not data then return; end
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61 local insert = self:prepare("insert into "..self.list_table.." values (?, ?, ?, ?)");
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62 return insert:execute(username, host, datastore, ser(data));
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63 end
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64
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65 function driver:list_store(username, host, datastore, data)
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66 -- remove existing data
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67 local delete = self:prepare("delete from "..self.list_table.." where username=? and host=? and datastore=?");
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68 delete:execute(username, host, datastore);
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69 if data and next(data) ~= nil then
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70 -- add data
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71 for _, d in ipairs(data) do
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72 self:list_append(username, host, datastore, ser(d));
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73 end
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74 end
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75 return true;
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76 end
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77
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78 function driver:list_load(username, host, datastore)
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79 local select = self:prepare("select data from "..self.list_table.." where username=? and host=? and datastore=?");
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80 select:execute(username, host, datastore);
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81 local r = {};
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82 for row in select:rows() do
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83 table.insert(r, deser(row[1]));
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84 end
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85 return r;
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86 end
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87
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88 local _M = {};
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89 function _M.new(dbtype, dbname, ...)
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90 local d = {};
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91 setmetatable(d, driver);
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92 local dbh = get_database(dbtype, dbname, ...);
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93 --d:set_connection(dbh);
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94 d.connection = dbh;
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95 return d;
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96 end
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97 return _M;