| 1 | var db = require("../utils/database"); |
| 2 | |
| 3 | /* |
| 4 | * Structure: |
| 5 | * id: problem number (int) |
| 6 | * uid: user id (int) |
| 7 | * vid: variant id (int) |
| 8 | * added: timestamp |
| 9 | * instructions: text |
| 10 | * solution: text |
| 11 | */ |
| 12 | |
| 13 | const ProblemModel = |
| 14 | { |
| 15 | create: function(uid, vid, fen, instructions, solution, cb) |
| 16 | { |
| 17 | db.serialize(function() { |
| 18 | const insertQuery = |
| 19 | "INSERT INTO Problems (added, uid, vid, fen, instructions, solution) " + |
| 20 | "VALUES (" + Date.now() + "," + uid + "," + vid + ",'" + fen + "',?,?)"; |
| 21 | db.run(insertQuery, [instructions, solution], err => { |
| 22 | if (!!err) |
| 23 | return cb(err); |
| 24 | db.get("SELECT last_insert_rowid() AS rowid", cb); |
| 25 | }); |
| 26 | }); |
| 27 | }, |
| 28 | |
| 29 | getOne: function(id, callback) |
| 30 | { |
| 31 | db.serialize(function() { |
| 32 | const query = |
| 33 | "SELECT * " + |
| 34 | "FROM Problems " + |
| 35 | "WHERE id = " + id; |
| 36 | db.get(query, callback); |
| 37 | }); |
| 38 | }, |
| 39 | |
| 40 | fetchN: function(vid, uid, type, directionStr, lastDt, MaxNbProblems, callback) |
| 41 | { |
| 42 | db.serialize(function() { |
| 43 | let typeLine = ""; |
| 44 | if (uid > 0) |
| 45 | typeLine = "AND uid " + (type=="others" ? "!=" : "=") + " " + uid; |
| 46 | const query = |
| 47 | "SELECT * FROM Problems " + |
| 48 | "WHERE vid = " + vid + |
| 49 | " AND added " + directionStr + " " + lastDt + " " + typeLine + " " + |
| 50 | "ORDER BY added " + (directionStr=="<" ? "DESC " : "") + |
| 51 | "LIMIT " + MaxNbProblems; |
| 52 | db.all(query, callback); |
| 53 | }); |
| 54 | }, |
| 55 | |
| 56 | // TODO: update fails (but insert is OK) |
| 57 | update: function(id, uid, fen, instructions, solution, cb) |
| 58 | { |
| 59 | db.serialize(function() { |
| 60 | const query = |
| 61 | "UPDATE Problems SET " + |
| 62 | "fen = '" + fen + "', " + |
| 63 | "instructions = ?, " + |
| 64 | "solution = ? " + |
| 65 | "WHERE id = " + id + " AND uid = " + uid; |
| 66 | db.run(query, [instructions,solution], cb); |
| 67 | }); |
| 68 | }, |
| 69 | |
| 70 | remove: function(id, uid) |
| 71 | { |
| 72 | db.serialize(function() { |
| 73 | const query = |
| 74 | "DELETE FROM Problems " + |
| 75 | "WHERE id = " + id + " AND uid = " + uid; |
| 76 | db.run(query); |
| 77 | }); |
| 78 | }, |
| 79 | } |
| 80 | |
| 81 | module.exports = ProblemModel; |