| 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 | exports.create = function(vname, fen, instructions, solution) |
| 14 | { |
| 15 | db.serialize(function() { |
| 16 | db.get("SELECT id FROM Variants WHERE name = '" + vname + "'", (err,variant) => { |
| 17 | db.run( |
| 18 | "INSERT INTO Problems (added, vid, fen, instructions, solution) VALUES " + |
| 19 | "(" + |
| 20 | Date.now() + "," + |
| 21 | variant.id + "," + |
| 22 | fen + "," + |
| 23 | instructions + "," + |
| 24 | solution + |
| 25 | ")"); |
| 26 | }); |
| 27 | }); |
| 28 | } |
| 29 | |
| 30 | exports.getById = function(id, callback) |
| 31 | { |
| 32 | db.serialize(function() { |
| 33 | db.get( |
| 34 | "SELECT * FROM Problems " + |
| 35 | "WHERE id ='" + id + "'", |
| 36 | callback); |
| 37 | }); |
| 38 | } |
| 39 | |
| 40 | exports.fetchN = function(vname, directionStr, lastDt, MaxNbProblems, callback) |
| 41 | { |
| 42 | db.serialize(function() { |
| 43 | db.all( |
| 44 | "SELECT * FROM Problems " + |
| 45 | "WHERE vid = (SELECT id FROM Variants WHERE name = '" + vname + "') " + |
| 46 | " AND added " + directionStr + " " + lastDt + " " + |
| 47 | "ORDER BY added " + (directionStr=="<" ? "DESC " : "") + |
| 48 | "LIMIT " + MaxNbProblems, |
| 49 | callback); |
| 50 | }); |
| 51 | } |
| 52 | |
| 53 | exports.update = function(id, uid, fen, instructions, solution) |
| 54 | { |
| 55 | db.serialize(function() { |
| 56 | db.run( |
| 57 | "UPDATE Problems " + |
| 58 | "fen = " + fen + ", " + |
| 59 | "instructions = " + instructions + ", " + |
| 60 | "solution = " + solution + " " + |
| 61 | "WHERE id = " + id + " AND uid = " + uid); |
| 62 | }); |
| 63 | } |
| 64 | |
| 65 | exports.remove = function(id, uid) |
| 66 | { |
| 67 | db.serialize(function() { |
| 68 | db.run( |
| 69 | "DELETE FROM Problems " + |
| 70 | "WHERE id = " + id + " AND uid = " + uid); |
| 71 | }); |
| 72 | } |