-
Notifications
You must be signed in to change notification settings - Fork 1
/
index.js
591 lines (573 loc) · 17.1 KB
/
index.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
var util = require("util");
var sqlite = require("sqlite-fts");
var events = require("events");
var async = require("async");
var _debug = true;
//TODO: Support for multiple sqlite DBs and using attach to queries
var primaryDB;
/// Helper to see if a variable is a callable function
var isFunction = function(func) {
return typeof(func) == 'function' && (!Function.prototype.call || typeof(func.call) == 'function');
}
var isObject = function(obj) {
return typeof(obj) == "object";
}
exports.connectToDB = function(path, cbDone) {
primaryDB = new sqlite.Database();
var self = this;
var ev = new events.EventEmitter();
primaryDB.open(path, function(err) {
if (err) {
ev.emit("error", err);
return;
}
//console.log("DB is open");
cbDone();
});
return ev;
}
/// Cursor for iterating results
var ModelCursor = function(model) {
this.model = model;
// Set our basic internals and create methods to set them
["query", "resultFields", "sort", "limit", "offset", "joins"].forEach(function(item) {
this["_" + item] = undefined;
// Check this so we're not resetting it constantly
if (!isFunction(ModelCursor.prototype[item])) {
ModelCursor.prototype[item] = function(value) {
this["_" + item] = value;
return this;
}
}
})
};
ModelCursor.prototype.each = function(cbEach, cbDone) {
//console.log("In each for " + this.model.name);
var self = this;
// Build our select query
var fields = (this._resultFields && this._resultFields.length > 0) ? this._resultFields.map(function(f) { return self.model.name + "." + f; }).join(",") : "*";
// We check which our our joins to include
this._joins = fields == "*" ? this.model.joins : this.model.joins.filter(function(join) {
self._resultFields.forEach(function(field) {
var ptIndex = field.indexOf(".");
if (ptIndex > 0 && join.name == field.substr(0, ptIndex)) {
return true;
}
return false;
});
});
var query = {rootTable:this.model.name, format:("SELECT " + fields + " FROM " + this.model.name), bindings:[]};
this._buildQuery(query);
if (_debug) {
console.log("Query: " + query.format);
console.log("Binds: " + query.bindings.toString());
}
//console.dir(this);
var ev = new events.EventEmitter();
if (_debug) {
var E = new Error();
console.log("[DEBUG] Query stack:"+ E.stack);
}
primaryDB.query(query.format, query.bindings, function(err, row) {
if (err) {
ev.emit("error", err);
return;
}
// All the rows done
if (row === undefined) {
cbDone.call(self);
return;
}
cbEach.call(self, new self.model.ModelEntry(row));
});
return ev;
};
ModelCursor.prototype.one = function(cbOne) {
var result;
// TODO: Some more error checking
return this.each(function(item) { result = item; }, function() {cbOne(result)});
}
ModelCursor.prototype.remove = function(entry, cbDone) {
if (entry) {
//TODO: impl the entry case
// Modify the query args based on the primary key of the entry
}
var query = {rootTable:this.model.name, format:("DELETE FROM " + this.model.name), bindings:[]};
this._buildQuery(query);
return this._basicQuery(query, cbDone);
};
ModelCursor.prototype.update = function(entry, cbDone) {
//TODO: impl
var query = {rootTable:this.model.name, format:("UPDATE " + this.model.name), bindings:[]};
query.format += " SET ";
var hasFirst = false
for (var k in entry._dirtyFields) {
if (!entry._dirtyFields.hasOwnProperty(k)) continue;
if (hasFirst) query.format += ","
query.format += k + "=?";
query.bindings.push(entry._dirtyFields[k]);
hasFirst = true;
}
if (!this._query) {
this._query = {};
this._query[entry.model.keys[0]] = entry.row[entry.model.keys[0]];
}
this._buildQuery(query);
return this._basicQuery(query, function() {
// Reset our dirty fields and carry on
this._dirtyFields = {};
cbDone();
});
};
//--
// cbDone(error, lastInsertedId)
//--
ModelCursor.prototype.insert = function(entry, cbDone) {
var query = {format:("INSERT INTO " + this.model.name), bindings:[]};
var columns = [];
var values = [];
for (var k in entry._dirtyFields) {
if (!entry._dirtyFields.hasOwnProperty(k)) continue;
columns.push(k);
values.push("?");
query.bindings.push(entry._dirtyFields[k]);
}
query.format += " (" + columns.map(function(k) { return "'" + k + "'";}).join(",") + ") VALUES (" + values.join(",") + ")"
var ev = this._basicQuery(query, function(err) {
// Reset the dirty fields and return the inserted id
this._dirtyFields = {};
primaryDB.execute("SELECT last_insert_rowid() AS last", function(err, rows) {
if (err) {
ev.emit("error", err);
return;
}
cbDone(undefined, rows[0].last);
});
});
return ev;
};
ModelCursor.prototype._basicQuery = function(query, cbDone) {
if (_debug) {
console.log("Query: " + query.format);
console.log("Binds: " + query.bindings.toString());
}
var ev = new events.EventEmitter();
primaryDB.execute(query.format, query.bindings, function(err, rows) {
if (err) {
if (_debug) console.error("[DEBUG] Error: " + err);
ev.emit("error", err);
return;
}
if (cbDone) cbDone();
});
return ev;
};
ModelCursor.prototype._buildQuery = function(query) {
// TODO: Only accepts 1 joined table right now
if (this._joins) this._joins.forEach(function(join) { join.func.build(query, join.alias); });
// The where clause
if (this._query && Object.keys(this._query).length > 0) query.format += " WHERE ";
var where = isFunction(this._query) ? this.query.build(query) : Ops.and(this._query).build(query);
if (this._sort) {
query.format += " ORDER BY ";
var hasFirst
for (var k in this._sort) {
if (this._sort.hasOwnProperty(k)) {
if (hasFirst) query.format += ","
query.format += this.model.name + "." + k + (this._sort[k] > 1 ? " ASC" : " DESC");
}
}
}
if (this._limit) {
query.format += " LIMIT "
if (this._offset) query.format += this._offset.toString() + ","
query.format += this._limit;
}
return query;
};
/// The model
var Model = function(name, spec) {
this.name = name;
this.spec = spec;
this.keys = [];
this.joins = [];
var self = this;
this.ModelEntry = function(row) {
this.model = self;
this.row = row;
this._dirtyFields = {};
}
this.ModelEntry.prototype.update = function(fields) {
for (var k in fields) {
if (fields.hasOwnProperty(k) && self.spec.hasOwnProperty(k)) {
this._dirtyFields[k] = fields[k];
} else {
if (_debug) console.log("[DEBUG] Unknown update field: " + k);
}
}
};
this.ModelEntry.prototype.remove = function(cbDone) {
var cursor = new ModelCursor(self);
cursor.remove(this, cbDone);
}
this.ModelEntry.prototype.insert = function(cbDone) {
var cursor = new ModelCursor(self);
cursor.insert(this, cbDone);
};
this.ModelEntry.prototype.save = function(cbDone) {
var entry = this;
async.forEach(self.joins, function(join, cb) {
if (join.func.preSave) join.func.preSave(entry, entry[join.alias], cb);
}, function(err) {
var cursor = new ModelCursor(self);
var func = entry.row === undefined ? "insert" : "update";
cursor[func](entry, function(err, id) {
async.forEach(self.joins, function(join, cb) {
if (join.func.postSave) {
join.func.postSave(entry, entry[join.alias], cb);
} else {
cb();
}
}, function() {
//console.log("HERE WE ARE (" + id + ")" + util.inspect(entry))
cbDone(err, id);
})
})
});
};
this.ModelEntry.prototype.toJSON = function() {
var simpleObject = {};
var self = this;
Object.keys(this.model.spec).forEach(function(k) {
if (self.row.hasOwnProperty(k)) simpleObject[k] = self.row[k];
});
return simpleObject;
};
function addBasicProp(key) {
Object.defineProperty(self.ModelEntry.prototype, key, {
get:function() {
if (this._dirtyFields.hasOwnProperty(key)) {
return this._dirtyFields[key];
} else {
return this.row[key];
}
},
set:function(value) {
this._dirtyFields[key] = value;
}
});
}
function addCallableProp(key) {
Object.defineProperty(self.ModelEntry.prototype, key, {
get:function() {
console.log("function get for " + key);
return spec[key].type(this, self);
}
})
}
for (var k in spec) {
if (!spec.hasOwnProperty(k)) continue;
//console.log("Adding " + k + " to ModelEntry");
// We call these indirectly due to the loop closure issue of javascript
if (spec[k].hasOwnProperty("primaryKey")) {
this.keys.push(k);
}
// This is getting gnarly
if (spec[k].hasOwnProperty("join")) {
this.joins.push({alias:k, func:spec[k].type});
} else if (spec[k].type && isFunction(spec[k].type)) {
addCallableProp(k);
} else {
addBasicProp(k);
}
}
// TODO: Process the spec into this.fields
}
Model.prototype.getSpecType = function(key) {
};
Model.prototype.count = function(cb) {
primaryDB.execute("SELECT COUNT(*) AS count FROM " + this.name, function(err, rows) {
if (err || !rows || rows.length < 1) {
cb(err || true);
}
cb(null, rows[0].count)
})
};
Model.prototype.find = function(expressions) {
var cursor = new ModelCursor(this);
cursor.query(expressions);
return cursor;
};
Model.prototype.update = function(entry, cbDone) {
var cursor = new ModelCursor(this);
cursor.update(entry, cbDone);
return cursor;
};
Model.prototype.new = function() {
var ret = new this.ModelEntry();
this.joins.forEach(function(join) {
ret[join.alias] = join.func.new();
});
return ret;
};
Model.prototype.remove = function(expression, cbDone) {
var cursor = new ModelCursor(this);
cursor.query(expression);
cursor.remove(null, cbDone);
};
Model.prototype.clear = function(cbDone) {
if (_debug) {
console.log("DELETE FROM " + this.name);
}
primaryDB.execute("DELETE FROM " + this.name, function(err, rows) {
cbDone(err);
});
};
Model.prototype.create = function(cbDone) {
var checkTableQuery = "SELECT name FROM sqlite_master WHERE type IN ('table','view') AND name NOT LIKE 'sqlite_%' UNION ALL SELECT name FROM sqlite_temp_master WHERE type IN ('table','view') ORDER BY 1";
var self = this;
primaryDB.execute(checkTableQuery, function(err, rows) {
if (rows.filter(function(row) { return row.name == self.name; }).length > 0) {
if (cbDone) cbDone();
return;
}
var fields = [];
for (var k in self.spec) {
if (!self.spec.hasOwnProperty(k)) continue;
//console.log("Creating key: " + k);
var specEntry = self.spec[k];
var field = {name:k};
if (typeof(specEntry) == "object" && specEntry.hasOwnProperty("type")) {
if (specEntry.hasOwnProperty("primaryKey")) field.primaryKey = specEntry.primaryKey;
if (specEntry.hasOwnProperty("autoIncrement")) field.autoIncrement = specEntry.autoIncrement;
specEntry = specEntry.type;
}
// Spec entries are either a direct function or an object with a create member, nothing else
if (isFunction(specEntry.create)) {
//console.log("Building the type");
specEntry.create(field);
fields.push(field);
}
}
var sql = "CREATE TABLE " + self.name + " (";
sql += fields.map(function(entry) {
return "'" + entry.name + "' " + entry.type + (entry.primaryKey ? " PRIMARY KEY" : "") + (entry.autoIncrement ? " AUTOINCREMENT" : "");
}).join(",");
sql += ")";
if (_debug) process.stderr.write(sql + "\n");
primaryDB.execute(sql, function(err, rows) {
if (cbDone) cbDone(err);
})
});
};
exports.Model = Model;
/// Core operations supported by the expression builder
//-- A basic comparison between a field and a value
function ComparisonOp(operator, value) {
this.operator = operator;
this.expression = value;
}
ComparisonOp.prototype.build = function(query) {
query.format += this.operator;
if (isFunction(this.expression)) {
this.expression.call(query);
} else {
query.format += this.expression;
}
};
//-- A basic boolean operation on a series of expressions
function BooleanOp(type, expressions) {
this.type = type;
this.expressions = expressions;
}
BooleanOp.prototype.build = function(query) {
var hasFirst = false;
for (var x in this.expressions) {
if (!this.expressions.hasOwnProperty(x)) continue;
if (hasFirst) query.format += " " + this.type + " ";
var expression = this.expressions[x];
if (isFunction(expression.build)) {
query.format += x;
expression.build.call(this.expressions[x], query);
} else {
if (x.indexOf(".") < 0) x = query.rootTable + "." + x;
query.format += x + " = ?";
query.bindings.push(expression);
}
hasFirst = true;
}
}
function InOp(values) {
this.values = values;
}
InOp.prototype.build = function(query) {
query.format += " IN (" + Array(this.values.length).join("?,").slice(0, -1) + ")";
query.bindings = query.bindings.concat(this.values);
};
Ops = {
gt:function(value) {
return new ComparisonOp(">", value);
},
gte:function(value) {
return new ComparisonOp(">=", value);
},
lt:function(value) {
return new ComparisonOp("<", value);
},
lte:function(value) {
return new ComparisonOp("<=", value);
},
ne:function(value) {
return new ComparisonOp("!=", value);
},
or:function(expressions) {
return new BooleanOp("OR", expressions);
},
and:function(expressions) {
return new BooleanOp("AND", expressions);
},
in:function(values) {
return new InOp(values);
}
};
exports.Ops = Ops;
/************************************************************************************
/ Joins are so awesome...
*/
var InnerJoin = function(entry, parentModel, childModel) {
this.entry = entry;
this.parentModel = parentModel;
this.childModel = childModel;
var self = this;
this.ProxyEntry = function(proxiedEntry) {
this.entry = proxiedEntry;
}
util.inherits(this.ProxyEntry, childModel.ModelEntry);
this.ProxyEntry.prototype.save = function(cbDone) {
console.log("*** Save it via proxy" + util.inspect(this, true, 3));
this.entry.save(function(err, lastInsertID){
if (err) {
cbDone(err);
return;
}
var joinTable = self.parentModel.name + "_" + self.childModel.name;
var query = "INSERT INTO " + joinTable + " (" + self.childModel.name + "_id," + self.parentModel.name + "_id) VALUES (?,?)";
console.log("Query:" + query);
console.log("Binds: " + [lastInsertID, self.entry.id]);
primaryDB.execute(query, [lastInsertID, self.entry.id], function(error, rows){
if (error) {
cbDone(error);
return;
}
cbDone();
})
})
};
}
InnerJoin.prototype.build = function(query) {
var joinTable = this.parentModel.name + "_" + this.childModel.name;
var key = joinTable + "." + this.childModel.name + "_id";
query.format += " INNER JOIN " + joinTable + " ON " + key + "=id";
};
InnerJoin.prototype.find = function(query) {
var joinTable = this.parentModel.name + "_" + this.childModel.name;
var key = joinTable + "." + this.parentModel.name + "_id";
if (isFunction(query)) {
var joinId = {};
joinId[key] = this.entry.id;
query = Ops.and([joinId].concat(query));
} else {
if (!query) query = {};
query[key] = this.entry.id;
}
return this.childModel.find.call(this.childModel, query).joins(this)
};
InnerJoin.prototype.new = function() {
return new this.ProxyEntry(this.childModel.new());
};
InnerJoin.prototype.create = function() {
console.log("should create a hasMany");
};
//-- Methods to use in your model to do relationships
exports.hasMany = function(model) {
return {
type:function(childModel) {
return function(entry, parentModel) {
return new InnerJoin(entry, parentModel, childModel);
}
}
};
}
exports.hasOne = function(model) {
if (!model || !model.spec) throw new Error("The child model is not fully defined.");
var primaryKey = undefined;
Object.keys(model.spec).forEach(function(key) {
if (model.spec[key].primaryKey) {
primaryKey = key;
}
});
if (!primaryKey) throw new Error("The child model did not have a primary key.");
var self = this;
return {
type:{
build:function(query, alias) {
query.format += " LEFT JOIN " + model.name + " AS " + alias + " ON " + query.rootTable + "._" + model.name + "_id = " + alias + "._id ";
},
create:function(field) {
field.name = "_" + model.name + "_id";
model.spec[primaryKey].type.create(field);
},
new:function() {
return model.new();
},
preSave:function(joinCursor, parentCursor, callback) {
parentCursor.save(function(err, id) {
// TODO: This is a bit of a hack, it forces it into the updated fields. Maybe consider a more complete mechanism
joinCursor._dirtyFields["_" + model.name + "_id"] = id;
callback();
})
}
},
join:true
};
}
/// Core supported types
Types = {
String:{
create:function(field) {
field.type = "text";
}
},
Date:{
create:function(field) {
field.type = "integer";
}
},
Number:{
create:function(field) {
field.type = "integer";
}
},
Text:{
create:function(field) {
field.type = "text";
}
},
PrimaryKey:function(type) {
return {
create:function(field) {
type.create(field);
field.type = field.type + " PRIMARY KEY";
}
};
},
AutoIncrement:function(type) {
return {
create:function(field) {
type.create(field);
field.type = field.type + " AUTOINCREMENT";
}
};
}
};
exports.Types = Types;