"Too many SQL variables" error in django witih sqlite3


Question

I'm getting this error using sqlite3 in django:

Exception Value: too many SQL variables

And I think the answer to it is this, from http://www.sqlite.org/limits.html:

Many SQL programmers are familiar with using a question mark ("?") as a host parameter. SQLite also supports named host parameters prefaced by ":", "$", or "@" and numbered host parameters of the form "?123".

To prevent excessive memory allocations, the maximum value of a host parameter number is SQLITE_MAX_VARIABLE_NUMBER, which defaults to 999."

However, there's a remaining oddity that I don't understand, which is that the same query runs fine from a django shell session (launched with python manage.py shell), but not when the call is made from my views.py.

These are the lines of code that are causing the error:

vals = Company.objects.filter(id__in=comp_ids).values('id', 'name').order_by('name')
names_map = SortedDict(vals)

where comp_ids is a set containing 1038 integer elements.

The exact same query, with an even greater no. of comp_ids (3800+) runs fine in the django shell (launched with python manage.py shell) - the dictionary gets created, and I could iterate through it.

I've tried breaking up comp_ids into sets of e.g. [:996] (that seemed to be the limit before it barfed) i.e. filter(id__in=comp_ids[:996]), then the rest in the next iteration, which would be consistent with the "no. of host parameters" explanation.

But why would it work in the django shell but not from views.py?

EDIT: Some more information: Entering the query into the sqlite shell (manage.py dbshell) returns the full set of results with no errors, same as in the django shell (manage.py shell).

Here are the exact list of parameters (1039 elements) and the query, if you'd like to know the details:

params

(2, 3, 4, 2053, 6, 7, 2732, 10, 3737, 13, 2063, 2064, 17, 18, 21, 2393, 2052, 29, 30, 32, 2456, 35, 36, 38, 40, 2396, 42, 2731, 45, 46, 2095, 3343, 49, 2098, 2252, 53, 54, 58, 59, 2058, 62, 63, 64, 66, 67, 72, 2123, 3426, 3344, 79, 80, 81, 85, 2134, 87, 91, 92, 95, 98, 2747, 2149, 102, 104, 106, 2155, 109, 110, 3773, 2455, 2165, 118, 122, 2171, 2172, 127, 134, 135, 137, 138, 2187, 2413, 145, 148, 2414, 2198, 2199, 152, 153, 154, 2204, 157, 2210, 163, 2417, 169, 170, 2219, 172, 173, 3279, 2077, 179, 180, 181, 2230, 2231, 184, 186, 187, 2237, 190, 191, 2240, 2241, 3787, 2245, 2246, 2247, 2248, 2249, 2251, 204, 205, 207, 208, 209, 210, 213, 214, 2263, 2265, 3450, 222, 2273, 2274, 2275, 228, 2277, 2811, 231, 234, 2283, 2284, 238, 240, 243, 248, 250, 2299, 2300, 254, 2303, 2305, 258, 2307, 2308, 2309, 2310, 2311, 2312, 2313, 267, 269, 2318, 271, 2320, 2321, 2322, 2323, 2325, 278, 2327, 280, 282, 283, 285, 286, 287, 290, 2342, 295, 298, 2347, 2348, 2349, 2350, 2351, 304, 2353, 307, 309, 312, 318, 320, 321, 323, 326, 327, 328, 332, 333, 334, 2385, 338, 2387, 2388, 2389, 2390, 2391, 2392, 345, 2394, 347, 348, 350, 352, 354, 355, 356, 357, 359, 360, 2410, 364, 365, 366, 2415, 2416, 369, 2451, 373, 2422, 375, 377, 2426, 2428, 2429, 2430, 2432, 2433, 387, 2454, 391, 2441, 2443, 398, 399, 400, 401, 2553, 403, 404, 405, 406, 407, 408, 409, 410, 411, 413, 2462, 3628, 418, 2459, 420, 2469, 2470, 2472, 425, 427, 2476, 2461, 2483, 2485, 440, 441, 2490, 443, 444, 445, 446, 2496, 2497, 2499, 2501, 2502, 455, 2504, 2505, 459, 460, 2466, 2510, 463, 465, 466, 467, 469, 470, 2519, 2520, 2468, 474, 2529, 2531, 484, 486, 487, 488, 490, 491, 493, 2542, 2543, 2544, 497, 498, 499, 500, 2549, 502, 2551, 504, 505, 2554, 2555, 2556, 509, 2558, 511, 2560, 2562, 2475, 2564, 517, 2566, 2567, 2568, 2569, 523, 2572, 526, 527, 529, 536, 538, 539, 2588, 2589, 2590, 2596, 550, 552, 556, 2605, 2607, 2608, 2612, 565, 566, 567, 568, 580, 2634, 587, 2636, 2638, 2639, 2270, 595, 598, 2489, 605, 606, 609, 610, 2407, 615, 618, 619, 620, 2669, 2670, 2493, 2672, 2152, 628, 629, 630, 2680, 2682, 2684, 640, 641, 642, 2691, 645, 648, 650, 2699, 2700, 2701, 2702, 2703, 2705, 659, 2708, 661, 2712, 667, 2718, 2719, 2720, 2721, 2723, 2724, 2725, 2728, 681, 2730, 2614, 684, 2733, 2735, 2736, 689, 2739, 2741, 2746, 699, 701, 706, 707, 2757, 2759, 2760, 2508, 2763, 2766, 721, 2771, 725, 730, 2511, 732, 2170, 734, 2343, 743, 749, 2798, 2799, 752, 753, 2515, 756, 2078, 2807, 2808, 2412, 763, 2813, 766, 769, 2818, 2821, 2822, 779, 2861, 2833, 2834, 2835, 2836, 2837, 790, 802, 2852, 2854, 2856, 2550, 810, 2860, 813, 2862, 2863, 817, 2869, 2870, 2871, 824, 826, 2876, 829, 830, 2882, 836, 2885, 2886, 3574, 2890, 2892, 2893, 847, 2896, 2872, 2899, 2902, 2546, 2909, 2256, 2912, 2913, 870, 2920, 2921, 2922, 876, 2930, 887, 2937, 3903, 892, 893, 894, 895, 896, 897, 898, 899, 900, 901, 903, 904, 905, 906, 907, 908, 909, 910, 911, 2884, 2970, 927, 2977, 2978, 2979, 2980, 2981, 2545, 941, 942, 2205, 948, 949, 950, 951, 952, 953, 954, 955, 956, 957, 958, 959, 960, 961, 962, 963, 964, 965, 3014, 967, 968, 969, 970, 971, 3234, 2552, 980, 981, 982, 983, 985, 2895, 3038, 995, 996, 998, 2897, 2538, 2761, 3051, 1012, 1013, 3062, 3063, 3066, 2559, 3073, 1027, 1028, 1029, 1030, 2421, 3080, 1036, 1038, 1039, 1040, 1041, 3092, 3246, 3853, 1050, 3099, 1057, 3109, 3112, 1067, 1068, 1073, 1074, 1075, 1076, 1078, 1081, 2491, 1086, 2229, 1088, 1089, 1090, 1091, 1092, 1093, 1095, 1096, 1097, 1098, 1099, 1100, 1101, 1102, 1103, 1104, 1105, 1106, 1107, 1108, 1109, 1110, 1111, 1112, 3161, 1119, 3170, 2235, 3174, 3176, 3177, 1132, 1133, 1134, 1135, 1136, 3186, 1141, 3192, 3193, 3194, 3195, 3197, 3198, 2425, 1152, 1155, 1156, 3205, 2924, 3214, 1168, 1169, 1171, 1172, 1173, 1174, 1175, 1176, 3225, 1178, 3230, 1186, 1189, 1193, 1194, 1195, 1196, 3245, 1198, 1199, 1200, 1202, 2541, 3273, 1210, 3259, 1213, 1225, 1226, 1228, 1230, 2253, 3280, 3281, 1234, 1235, 1238, 1243, 1244, 1248, 1249, 3298, 3299, 1253, 3302, 2257, 3304, 3305, 3306, 3308, 1262, 2838, 3315, 3317, 3381, 1277, 1278, 3327, 3331, 3332, 1285, 2945, 1288, 1289, 1292, 1295, 1296, 1298, 3347, 3348, 3349, 1302, 3351, 3352, 3353, 1306, 1307, 3356, 1312, 3364, 1320, 3370, 3371, 3372, 3374, 3375, 1328, 3377, 3378, 3380, 1333, 1334, 3388, 3390, 3296, 3394, 3395, 2227, 1350, 2615, 1357, 1361, 1362, 3411, 3412, 3413, 1368, 2276, 1371, 1372, 3105, 1378, 2228, 3428, 3430, 3433, 1400, 1402, 1404, 3453, 3455, 3808, 1409, 3458, 3459, 1412, 1414, 1416, 1417, 1418, 1419, 1420, 2093, 3470, 1437, 3486, 1439, 2571, 3491, 3492, 3493, 1446, 2435, 1454, 1463, 3663, 3523, 1477, 1478, 1479, 1480, 1481, 1482, 3531, 1484, 1488, 1489, 1490, 3540, 1494, 1495, 1496, 3546, 3547, 2298, 1510, 1512, 3666, 1520, 1523, 2302, 1526, 1527, 3584, 1539, 1540, 1542, 1543, 1548, 1549, 3393, 1554, 1555, 1560, 1561, 3079, 1565, 2507, 3616, 3617, 1570, 3619, 3620, 3621, 3622, 1575, 3624, 2817, 3629, 3630, 1583, 1590, 1591, 1592, 2996, 3643, 3645, 2997, 3649, 2781, 3653, 3655, 1608, 3657, 2317, 1618, 3667, 1620, 3669, 1625, 2319, 3002, 2782, 1633, 1634, 3199, 3691, 3346, 3688, 1650, 1656, 3007, 3709, 3008, 1666, 2616, 3009, 2668, 2306, 3723, 3010, 2238, 1681, 1682, 1683, 1687, 3012, 3738, 2671, 1693, 3013, 1697, 1698, 2548, 3749, 3755, 3757, 3758, 2333, 1714, 1718, 3770, 3018, 1729, 3778, 3783, 1739, 1744, 3793, 1746, 1752, 1753, 1755, 3741, 3707, 1771, 1774, 2514, 1779, 2494, 3831, 1788, 2346, 3029, 3840, 3182, 2689, 1802, 1803, 2690, 1811, 1815, 1817, 3011, 2352, 1827, 2467, 1832, 3881, 1839, 1840, 2107, 1848, 1849, 2698, 2653, 1855, 1857, 1864, 1867, 1872, 1873, 3923, 1878, 1882, 1889, 3354, 1903, 1904, 2366, 1915, 1920, 1921, 1927, 1928, 1930, 1931, 3133, 1943, 1947, 1957, 1958, 1959, 1964, 1967, 1968, 1976, 2809, 3612, 1987, 1988, 1989, 3745, 1994, 2000, 2003, 2382, 2008, 3613, 2021, 2022, 3410, 3464, 2033, 2034, 2037, 2038, 2729, 2044)

query

'SELECT "screen_company"."id", "screen_company"."name" FROM "screen_company" WHERE "screen_company"."id" IN (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?) ORDER BY "screen_company"."name" ASC'

(Incidentally, you don't need to use pdb for that - django very helpfully displays the backtrace in the browser (in render_to_response()?) when an error occurs, with a full list of the local variables at each step, so you can see the full query there.)

I had, however, previously tried stepping into the django code with pdb, and found the error was actually originating from python's pysqlite2.dbapi2 (or sqlite3.dbapi2) module, at line 200 of django/db/backends/sqlite3/base.py:

return Database.Cursor.execute(self, query, params)

(which was also in the helpful backtrace shown in the error page), where Database is an alias for either pysqlite2.dbapi2, or sqlite3.dbapi2, depending on your python version.

But I thought that was too far down the call stack to keep debugging (for now), so decided to stop, and started thinking about workarounds and googling for answers instead. :)

1
40
8/19/2011 4:31:48 PM

Googling this error message brought me here so adding my solution.

In my case this error was caused by line:

Event.objects.all().delete()

Probably Django was trying to "DELETE WHERE id IN (?,?,?,..." and list of ids was to long.

Performance was not an issue for me so i solved this by:

while Event.objects.count():
    ids = Event.objects.values_list('pk', flat=True)[:100]
    Event.objects.filter(pk__in = ids).delete()
17
8/12/2013 7:20:37 AM

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