aboutsummaryrefslogtreecommitdiff
path: root/odb/database.txx
blob: a46b8b018958d32c8a9f3afe3941b0cd687b550b (plain)
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
// file      : odb/database.txx
// copyright : Copyright (c) 2009-2013 Code Synthesis Tools CC
// license   : GNU GPL v2; see accompanying LICENSE file

#include <odb/section.hxx>
#include <odb/exceptions.hxx>
#include <odb/no-op-cache-traits.hxx>
#include <odb/pointer-traits.hxx>

namespace odb
{
  template <typename T>
  result<T> database::
  query (const odb::query<T>& q, bool cache)
  {
    // T is always object_type. We also don't need to check for transaction
    // here; object_traits::query () does this.
    //
    result<T> r (query_<T, id_common>::call (*this, q));

    if (cache)
      r.cache ();

    return r;
  }

  // Implementations (i.e., the *_() functions).
  //
  template <typename T, database_id DB>
  typename object_traits<T>::id_type database::
  persist_ (T& obj)
  {
    // T can be const T while object_type will always be T.
    //
    typedef typename object_traits<T>::object_type object_type;
    typedef object_traits_impl<object_type, DB> object_traits;

    object_traits::persist (*this, obj);

    typename object_traits::reference_cache_traits::position_type p (
      object_traits::reference_cache_traits::insert (
        *this, reference_cache_type<T>::convert (obj)));

    object_traits::reference_cache_traits::persist (p);

    return object_traits::id (obj);
  }

  template <typename T, database_id DB>
  typename object_traits<T>::id_type database::
  persist_ (const typename object_traits<T>::pointer_type& pobj)
  {
    // T can be const T while object_type will always be T.
    //
    typedef typename object_traits<T>::object_type object_type;
    typedef typename object_traits<T>::pointer_type pointer_type;

    typedef object_traits_impl<object_type, DB> object_traits;

    T& obj (pointer_traits<pointer_type>::get_ref (pobj));
    object_traits::persist (*this, obj);

    // Get the canonical object pointer and insert it into object cache.
    //
    typename object_traits::pointer_cache_traits::position_type p (
      object_traits::pointer_cache_traits::insert (
        *this, pointer_cache_type<pointer_type>::convert (pobj)));

    object_traits::pointer_cache_traits::persist (p);

    return object_traits::id (obj);
  }

  template <typename T, bool = object_traits<T>::auto_id> struct persist_type;
  template <typename T> struct persist_type<T, true> {typedef T type;};
  template <typename T> struct persist_type<T, false> {typedef const T type;};

  template <typename I, typename T, database_id DB>
  void database::
  persist_ (I b, I e, bool cont, details::meta::no /*ptr*/)
  {
    // T can be const T while object_type will always be T.
    //
    typedef typename object_traits<T>::object_type object_type;
    typedef object_traits_impl<object_type, DB> object_traits;

    multiple_exceptions mex (typeid (object_already_persistent));
    try
    {
      while (b != e && (cont || mex.empty ()))
      {
        std::size_t n (0);
        T* a[object_traits::batch]; // T instead of persist_type for cache.

        for (; b != e && n < object_traits::batch; ++n)
        {
          // Compiler error pointing here? Perhaps the passed range is
          // of const objects?
          //
          typename persist_type<object_type>::type* p (&(*b++));

          a[n] = const_cast<T*> (p);
        }

        // Compiler error pointing here? Perhaps the object or the
        // database does not support bulk operations?
        //
        object_traits::persist (
          *this,
          const_cast<typename persist_type<object_type>::type**> (a),
          n,
          mex);

        if (mex.fatal ())
          break;

        for (std::size_t i (0); i < n; ++i)
        {
          if (mex[i] != 0) // Don't cache objects that have failed.
            continue;

          mex.current (i); // Set position in case the below code throws.

          typename object_traits::reference_cache_traits::position_type p (
            object_traits::reference_cache_traits::insert (
              *this, reference_cache_type<T>::convert (*a[i])));

          object_traits::reference_cache_traits::persist (p);
        }

        mex.delta (n);
      }
    }
    catch (const odb::exception& ex)
    {
      mex.insert (ex, true);
    }

    if (!mex.empty ())
    {
      mex.prepare ();
      throw mex;
    }
  }

  template <typename P>
  struct pointer_copy
  {
    const P* ref;
    P copy;

    void assign (const P& p) {ref = &p;}
    template <typename P1> void assign (const P1& p1)
    {
      // The passed pointer should be the same or implicit-convertible
      // to the object pointer. This way we make sure the object pointer
      // does not assume ownership of the passed object.
      //
      const P& p (p1);

      copy = p;
      ref = &copy;
    }
  };

  template <typename I, typename T, database_id DB>
  void database::
  persist_ (I b, I e, bool cont, details::meta::yes /*ptr*/)
  {
    // T can be const T while object_type will always be T.
    //
    typedef typename object_traits<T>::object_type object_type;
    typedef typename object_traits<T>::pointer_type pointer_type;

    typedef object_traits_impl<object_type, DB> object_traits;

    multiple_exceptions mex (typeid (object_already_persistent));
    try
    {
      while (b != e && (cont || mex.empty ()))
      {
        std::size_t n (0);
        typename persist_type<object_type>::type* a[object_traits::batch];
        pointer_copy<pointer_type> p[object_traits::batch];

        for (; b != e && n < object_traits::batch; ++n)
        {
          p[n].assign (*b++);
          a[n] = &pointer_traits<pointer_type>::get_ref (*p[n].ref);
        }

        // Compiler error pointing here? Perhaps the object or the
        // database does not support bulk operations?
        //
        object_traits::persist (*this, a, n, mex);

        if (mex.fatal ())
          break;

        for (std::size_t i (0); i < n; ++i)
        {
          if (mex[i] != 0) // Don't cache objects that have failed.
            continue;

          mex.current (i); // Set position in case the below code throws.

          // Get the canonical object pointer and insert it into object cache.
          //
          typename object_traits::pointer_cache_traits::position_type pos (
            object_traits::pointer_cache_traits::insert (
              *this, pointer_cache_type<pointer_type>::convert (*p[i].ref)));

          object_traits::pointer_cache_traits::persist (pos);
        }

        mex.delta (n);
      }
    }
    catch (const odb::exception& ex)
    {
      mex.insert (ex, true);
    }

    if (!mex.empty ())
    {
      mex.prepare ();
      throw mex;
    }
  }

  template <typename T, database_id DB>
  typename object_traits<T>::pointer_type database::
  load_ (const typename object_traits<T>::id_type& id)
  {
    // T is always object_type.
    //
    typedef typename object_traits<T>::pointer_type pointer_type;

    pointer_type r (find_<T, DB> (id));

    if (pointer_traits<pointer_type>::null_ptr (r))
      throw object_not_persistent ();

    return r;
  }

  template <typename T, database_id DB>
  void database::
  load_ (const typename object_traits<T>::id_type& id, T& obj)
  {
    if (!find_<T, DB> (id, obj))
      throw object_not_persistent ();
  }

  template <typename T, database_id DB>
  void database::
  load_ (T& obj, section& s)
  {
    connection_type& c (transaction::current ().connection ());

    // T is always object_type.
    //
    if (object_traits_impl<T, DB>::load (c, obj, s))
      s.reset (true, false); // Loaded, unchanged.
    else
      throw section_not_in_object ();
  }

  template <typename T, database_id DB>
  void database::
  reload_ (T& obj)
  {
    // T should be object_type (cannot be const). We also don't need to
    // check for transaction here; object_traits::reload () does this.
    //
    if (!object_traits_impl<T, DB>::reload (*this, obj))
      throw object_not_persistent ();
  }

  template <typename I, database_id DB>
  void database::
  update_ (I b, I e, bool cont)
  {
    // Sun CC with non-standard STL does not have iterator_traits.
    //
#ifndef _RWSTD_NO_CLASS_PARTIAL_SPEC
    typedef typename std::iterator_traits<I>::value_type value_type;
#else
    // Assume iterator is just a pointer.
    //
    typedef typename object_pointer_traits<I>::object_type value_type;
#endif

    // object_pointer_traits<T>::object_type can be const.
    //
    typedef object_pointer_traits<value_type> opt;

    typedef
    typename object_traits<typename opt::object_type>::object_type
    object_type;

    typedef object_traits_impl<object_type, DB> object_traits;

    multiple_exceptions mex (typeid (object_not_persistent));
    try
    {
      while (b != e && (cont || mex.empty ()))
      {
        std::size_t n (0);
        const object_type* a[object_traits::batch];

        for (; b != e && n < object_traits::batch; ++n)
          a[n] = &opt::get_ref (*b++);

        // Compiler error pointing here? Perhaps the object or the
        // database does not support bulk operations?
        //
        object_traits::update (*this, a, n, mex);

        if (mex.fatal ())
          break;

        mex.delta (n);
      }
    }
    catch (const odb::exception& ex)
    {
      mex.insert (ex, true);
    }

    if (!mex.empty ())
    {
      mex.prepare ();
      throw mex;
    }
  }

  template <typename T, database_id DB>
  void database::
  update_ (const T& obj, const section& s)
  {
    if (!s.loaded ())
      throw section_not_loaded ();

    transaction& t (transaction::current ());

    // T is always object_type.
    //
    if (object_traits_impl<T, DB>::update (t.connection (), obj, s))
    {
      if (s.changed ())
        s.reset (true, false, &t); // Clear the change flag.
    }
    else
      throw section_not_in_object ();
  }

  template <typename I, typename T, database_id DB>
  void database::
  erase_id_ (I b, I e, bool cont)
  {
    // T is explicitly specified by the caller, so assume it is object type.
    //
    typedef T object_type;
    typedef object_traits_impl<object_type, DB> object_traits;
    typedef typename object_traits::id_type id_type;

    multiple_exceptions mex (typeid (object_not_persistent));
    try
    {
      while (b != e && (cont || mex.empty ()))
      {
        std::size_t n (0);
        const id_type* a[object_traits::batch];

        for (; b != e && n < object_traits::batch; ++n)
          // Compiler error pointing here? Perhaps the object id type
          // and the range element type don't match?
          //
          a[n] = &(*b++);

        // Compiler error pointing here? Perhaps the object or the
        // database does not support bulk operations?
        //
        object_traits::erase (*this, a, n, mex);

        if (mex.fatal ())
          break;

        mex.delta (n);
      }
    }
    catch (const odb::exception& ex)
    {
      mex.insert (ex, true);
    }

    if (!mex.empty ())
    {
      mex.prepare ();
      throw mex;
    }
  }

  template <typename I, database_id DB>
  void database::
  erase_object_ (I b, I e, bool cont)
  {
    // Sun CC with non-standard STL does not have iterator_traits.
    //
#ifndef _RWSTD_NO_CLASS_PARTIAL_SPEC
    typedef typename std::iterator_traits<I>::value_type value_type;
#else
    // Assume iterator is just a pointer.
    //
    typedef typename object_pointer_traits<I>::object_type value_type;
#endif

    // object_pointer_traits<T>::object_type can be const.
    //
    typedef object_pointer_traits<value_type> opt;

    typedef
    typename object_traits<typename opt::object_type>::object_type
    object_type;

    typedef object_traits_impl<object_type, DB> object_traits;

    multiple_exceptions mex (typeid (object_not_persistent));
    try
    {
      while (b != e && (cont || mex.empty ()))
      {
        std::size_t n (0);
        const object_type* a[object_traits::batch];

        for (; b != e && n < object_traits::batch; ++n)
          a[n] = &opt::get_ref (*b++);

        // Compiler error pointing here? Perhaps the object or the
        // database does not support bulk operations?
        //
        object_traits::erase (*this, a, n, mex);

        if (mex.fatal ())
          break;

        mex.delta (n);
      }
    }
    catch (const odb::exception& ex)
    {
      mex.insert (ex, true);
    }

    if (!mex.empty ())
    {
      mex.prepare ();
      throw mex;
    }
  }

  template <typename T, database_id DB>
  struct database::query_<T, DB, class_object>
  {
    template <typename Q>
    static result<T>
    call (database& db, const Q& q)
    {
      return object_traits_impl<T, DB>::query (db, q);
    }
  };

  template <typename T, database_id DB>
  struct database::query_<T, DB, class_view>
  {
    template <typename Q>
    static result<T>
    call (database& db, const Q& q)
    {
      return view_traits_impl<T, DB>::query (db, q);
    }
  };
}