1: # 2010 September 20
2: #
3: # The author disclaims copyright to this source code. In place of
4: # a legal notice, here is a blessing:
5: #
6: # May you do good and not evil.
7: # May you find forgiveness for yourself and forgive others.
8: # May you share freely, never taking more than you give.
9: #
10: #***********************************************************************
11: #
12: # This file implements tests to verify that the "testable statements" in
13: # the lang_update.html document are correct.
14: #
15: set testdir [file dirname $argv0]
16: source $testdir/tester.tcl
17:
18: #--------------------
19: # Test organization:
20: #
21: # e_update-1.*: Test statements describing the workings of UPDATE statements.
22: #
23: # e_update-2.*: Test the restrictions on the UPDATE statement syntax that
24: # can be used within triggers.
25: #
26: # e_update-3.*: Test the special LIMIT/OFFSET and ORDER BY clauses that can
27: # be used with UPDATE when SQLite is compiled with
28: # SQLITE_ENABLE_UPDATE_DELETE_LIMIT.
29: #
30:
31: forcedelete test.db2
32:
33: do_execsql_test e_update-0.0 {
34: ATTACH 'test.db2' AS aux;
35: CREATE TABLE t1(a, b);
36: CREATE TABLE t2(a, b, c);
37: CREATE TABLE t3(a, b UNIQUE);
38: CREATE TABLE t6(x, y);
39: CREATE INDEX i1 ON t1(a);
40:
41: CREATE TEMP TABLE t4(x, y);
42: CREATE TEMP TABLE t6(x, y);
43:
44: CREATE TABLE aux.t1(a, b);
45: CREATE TABLE aux.t5(a, b);
46: } {}
47:
48: proc do_update_tests {args} {
49: uplevel do_select_tests $args
50: }
51:
52: # EVIDENCE-OF: R-62337-45828 -- syntax diagram update-stmt
53: #
54: do_update_tests e_update-0 {
55: 1 "UPDATE t1 SET a=10" {}
56: 2 "UPDATE t1 SET a=10, b=5" {}
57: 3 "UPDATE t1 SET a=10 WHERE b=5" {}
58: 4 "UPDATE t1 SET b=5,a=10 WHERE 1" {}
59: 5 "UPDATE main.t1 SET a=10" {}
60: 6 "UPDATE main.t1 SET a=10, b=5" {}
61: 7 "UPDATE main.t1 SET a=10 WHERE b=5" {}
62: 9 "UPDATE OR ROLLBACK t1 SET a=10" {}
63: 10 "UPDATE OR ROLLBACK t1 SET a=10, b=5" {}
64: 11 "UPDATE OR ROLLBACK t1 SET a=10 WHERE b=5" {}
65: 12 "UPDATE OR ROLLBACK t1 SET b=5,a=10 WHERE 1" {}
66: 13 "UPDATE OR ROLLBACK main.t1 SET a=10" {}
67: 14 "UPDATE OR ROLLBACK main.t1 SET a=10, b=5" {}
68: 15 "UPDATE OR ROLLBACK main.t1 SET a=10 WHERE b=5" {}
69: 16 "UPDATE OR ROLLBACK main.t1 SET b=5,a=10 WHERE 1" {}
70: 17 "UPDATE OR ABORT t1 SET a=10" {}
71: 18 "UPDATE OR ABORT t1 SET a=10, b=5" {}
72: 19 "UPDATE OR ABORT t1 SET a=10 WHERE b=5" {}
73: 20 "UPDATE OR ABORT t1 SET b=5,a=10 WHERE 1" {}
74: 21 "UPDATE OR ABORT main.t1 SET a=10" {}
75: 22 "UPDATE OR ABORT main.t1 SET a=10, b=5" {}
76: 23 "UPDATE OR ABORT main.t1 SET a=10 WHERE b=5" {}
77: 24 "UPDATE OR ABORT main.t1 SET b=5,a=10 WHERE 1" {}
78: 25 "UPDATE OR REPLACE t1 SET a=10" {}
79: 26 "UPDATE OR REPLACE t1 SET a=10, b=5" {}
80: 27 "UPDATE OR REPLACE t1 SET a=10 WHERE b=5" {}
81: 28 "UPDATE OR REPLACE t1 SET b=5,a=10 WHERE 1" {}
82: 29 "UPDATE OR REPLACE main.t1 SET a=10" {}
83: 30 "UPDATE OR REPLACE main.t1 SET a=10, b=5" {}
84: 31 "UPDATE OR REPLACE main.t1 SET a=10 WHERE b=5" {}
85: 32 "UPDATE OR REPLACE main.t1 SET b=5,a=10 WHERE 1" {}
86: 33 "UPDATE OR FAIL t1 SET a=10" {}
87: 34 "UPDATE OR FAIL t1 SET a=10, b=5" {}
88: 35 "UPDATE OR FAIL t1 SET a=10 WHERE b=5" {}
89: 36 "UPDATE OR FAIL t1 SET b=5,a=10 WHERE 1" {}
90: 37 "UPDATE OR FAIL main.t1 SET a=10" {}
91: 38 "UPDATE OR FAIL main.t1 SET a=10, b=5" {}
92: 39 "UPDATE OR FAIL main.t1 SET a=10 WHERE b=5" {}
93: 40 "UPDATE OR FAIL main.t1 SET b=5,a=10 WHERE 1" {}
94: 41 "UPDATE OR IGNORE t1 SET a=10" {}
95: 42 "UPDATE OR IGNORE t1 SET a=10, b=5" {}
96: 43 "UPDATE OR IGNORE t1 SET a=10 WHERE b=5" {}
97: 44 "UPDATE OR IGNORE t1 SET b=5,a=10 WHERE 1" {}
98: 45 "UPDATE OR IGNORE main.t1 SET a=10" {}
99: 46 "UPDATE OR IGNORE main.t1 SET a=10, b=5" {}
100: 47 "UPDATE OR IGNORE main.t1 SET a=10 WHERE b=5" {}
101: 48 "UPDATE OR IGNORE main.t1 SET b=5,a=10 WHERE 1" {}
102: }
103:
104: # EVIDENCE-OF: R-38515-45264 An UPDATE statement is used to modify a
105: # subset of the values stored in zero or more rows of the database table
106: # identified by the qualified-table-name specified as part of the UPDATE
107: # statement.
108: #
109: # Test cases e_update-1.1.1.* test the "identified by the
110: # qualified-table-name" part of the statement above. Tests
111: # e_update-1.1.2.* show that the "zero or more rows" part is
112: # accurate.
113: #
114: do_execsql_test e_update-1.1.0 {
115: INSERT INTO main.t1 VALUES(1, 'i');
116: INSERT INTO main.t1 VALUES(2, 'ii');
117: INSERT INTO main.t1 VALUES(3, 'iii');
118:
119: INSERT INTO aux.t1 VALUES(1, 'I');
120: INSERT INTO aux.t1 VALUES(2, 'II');
121: INSERT INTO aux.t1 VALUES(3, 'III');
122: } {}
123: do_update_tests e_update-1.1 {
124: 1.1 "UPDATE t1 SET a = a+1; SELECT * FROM t1" {2 i 3 ii 4 iii}
125: 1.2 "UPDATE main.t1 SET a = a+1; SELECT * FROM main.t1" {3 i 4 ii 5 iii}
126: 1.3 "UPDATE aux.t1 SET a = a+1; SELECT * FROM aux.t1" {2 I 3 II 4 III}
127:
128: 2.1 "UPDATE t1 SET a = a+1 WHERE a = 1; SELECT * FROM t1" {3 i 4 ii 5 iii}
129: 2.2 "UPDATE t1 SET a = a+1 WHERE a = 4; SELECT * FROM t1" {3 i 5 ii 5 iii}
130: }
131:
132: # EVIDENCE-OF: R-55869-30521 If the UPDATE statement does not have a
133: # WHERE clause, all rows in the table are modified by the UPDATE.
134: #
135: do_execsql_test e_update-1.2.0 {
136: DELETE FROM main.t1;
137: INSERT INTO main.t1 VALUES(1, 'i');
138: INSERT INTO main.t1 VALUES(2, 'ii');
139: INSERT INTO main.t1 VALUES(3, 'iii');
140: } {}
141: do_update_tests e_update-1.2 {
142: 1 "UPDATE t1 SET b = 'roman' ; SELECT * FROM t1"
143: {1 roman 2 roman 3 roman}
144:
145: 2 "UPDATE t1 SET a = 'greek' ; SELECT * FROM t1"
146: {greek roman greek roman greek roman}
147: }
148:
149: # EVIDENCE-OF: R-42117-40023 Otherwise, the UPDATE affects only those
150: # rows for which the result of evaluating the WHERE clause expression as
151: # a boolean expression is true.
152: #
153: do_execsql_test e_update-1.3.0 {
154: DELETE FROM main.t1;
155: INSERT INTO main.t1 VALUES(NULL, '');
156: INSERT INTO main.t1 VALUES(1, 'i');
157: INSERT INTO main.t1 VALUES(2, 'ii');
158: INSERT INTO main.t1 VALUES(3, 'iii');
159: } {}
160: do_update_tests e_update-1.3 {
161: 1 "UPDATE t1 SET b = 'roman' WHERE a<2 ; SELECT * FROM t1"
162: {{} {} 1 roman 2 ii 3 iii}
163:
164: 2 "UPDATE t1 SET b = 'egyptian' WHERE (a-3)/10.0 ; SELECT * FROM t1"
165: {{} {} 1 egyptian 2 egyptian 3 iii}
166:
167: 3 "UPDATE t1 SET b = 'macedonian' WHERE a; SELECT * FROM t1"
168: {{} {} 1 macedonian 2 macedonian 3 macedonian}
169:
170: 4 "UPDATE t1 SET b = 'lithuanian' WHERE a IS NULL; SELECT * FROM t1"
171: {{} lithuanian 1 macedonian 2 macedonian 3 macedonian}
172: }
173:
174: # EVIDENCE-OF: R-58129-20729 It is not an error if the WHERE clause does
175: # not evaluate to true for any row in the table - this just means that
176: # the UPDATE statement affects zero rows.
177: #
178: do_execsql_test e_update-1.4.0 {
179: DELETE FROM main.t1;
180: INSERT INTO main.t1 VALUES(NULL, '');
181: INSERT INTO main.t1 VALUES(1, 'i');
182: INSERT INTO main.t1 VALUES(2, 'ii');
183: INSERT INTO main.t1 VALUES(3, 'iii');
184: } {}
185: do_update_tests e_update-1.4 -query {
186: SELECT * FROM t1
187: } {
188: 1 "UPDATE t1 SET b = 'burmese' WHERE a=5" {{} {} 1 i 2 ii 3 iii}
189:
190: 2 "UPDATE t1 SET b = 'burmese' WHERE length(b)<1 AND a IS NOT NULL"
191: {{} {} 1 i 2 ii 3 iii}
192:
193: 3 "UPDATE t1 SET b = 'burmese' WHERE 0" {{} {} 1 i 2 ii 3 iii}
194:
195: 4 "UPDATE t1 SET b = 'burmese' WHERE (SELECT a FROM t1 WHERE rowid=1)"
196: {{} {} 1 i 2 ii 3 iii}
197: }
198:
199: # EVIDENCE-OF: R-40598-36595 For each affected row, the named columns
200: # are set to the values found by evaluating the corresponding scalar
201: # expressions.
202: #
203: # EVIDENCE-OF: R-40472-60438 Columns that do not appear in the list of
204: # assignments are left unmodified.
205: #
206: do_execsql_test e_update-1.5.0 {
207: INSERT INTO t2(rowid, a, b, c) VALUES(1, 3, 1, 4);
208: INSERT INTO t2(rowid, a, b, c) VALUES(2, 1, 5, 9);
209: INSERT INTO t2(rowid, a, b, c) VALUES(3, 2, 6, 5);
210: } {}
211: do_update_tests e_update-1.5 -query {
212: SELECT * FROM t2
213: } {
214: 1 "UPDATE t2 SET c = 1+1 WHERE a=2"
215: {3 1 4 1 5 9 2 6 2}
216:
217: 2 "UPDATE t2 SET b = 4/2, c=CAST((0.4*5) AS INTEGER) WHERE a<3"
218: {3 1 4 1 2 2 2 2 2}
219:
220: 3 "UPDATE t2 SET a = 1"
221: {1 1 4 1 2 2 1 2 2}
222:
223: 4 "UPDATE t2 SET b = (SELECT count(*)+2 FROM t2), c = 24/3+1 WHERE rowid=2"
224: {1 1 4 1 5 9 1 2 2}
225:
226: 5 "UPDATE t2 SET a = 3 WHERE c = 4"
227: {3 1 4 1 5 9 1 2 2}
228:
229: 6 "UPDATE t2 SET a = b WHERE rowid>2"
230: {3 1 4 1 5 9 2 2 2}
231:
232: 6 "UPDATE t2 SET b=6, c=5 WHERE a=b AND b=c"
233: {3 1 4 1 5 9 2 6 5}
234: }
235:
236: # EVIDENCE-OF: R-34751-18293 If a single column-name appears more than
237: # once in the list of assignment expressions, all but the rightmost
238: # occurrence is ignored.
239: #
240: do_update_tests e_update-1.6 -query {
241: SELECT * FROM t2
242: } {
243: 1 "UPDATE t2 SET c=5, c=6, c=7 WHERE rowid=1" {3 1 7 1 5 9 2 6 5}
244: 2 "UPDATE t2 SET c=7, c=6, c=5 WHERE rowid=1" {3 1 5 1 5 9 2 6 5}
245: 3 "UPDATE t2 SET c=5, b=6, c=7 WHERE rowid=1" {3 6 7 1 5 9 2 6 5}
246: }
247:
248: # EVIDENCE-OF: R-36239-04077 The scalar expressions may refer to columns
249: # of the row being updated.
250: #
251: # EVIDENCE-OF: R-04558-24451 In this case all scalar expressions are
252: # evaluated before any assignments are made.
253: #
254: do_execsql_test e_update-1.7.0 {
255: DELETE FROM t2;
256: INSERT INTO t2(rowid, a, b, c) VALUES(1, 3, 1, 4);
257: INSERT INTO t2(rowid, a, b, c) VALUES(2, 1, 5, 9);
258: INSERT INTO t2(rowid, a, b, c) VALUES(3, 2, 6, 5);
259: } {}
260: do_update_tests e_update-1.7 -query {
261: SELECT * FROM t2
262: } {
263: 1 "UPDATE t2 SET a=b+c" {5 1 4 14 5 9 11 6 5}
264: 2 "UPDATE t2 SET a=b, b=a" {1 5 4 5 14 9 6 11 5}
265: 3 "UPDATE t2 SET a=c||c, c=NULL" {44 5 {} 99 14 {} 55 11 {}}
266: }
267:
268: # EVIDENCE-OF: R-12619-24112 The optional conflict-clause allows the
269: # user to nominate a specific constraint conflict resolution algorithm
270: # to use during this one UPDATE command.
271: #
272: do_execsql_test e_update-1.8.0 {
273: DELETE FROM t3;
274: INSERT INTO t3 VALUES(1, 'one');
275: INSERT INTO t3 VALUES(2, 'two');
276: INSERT INTO t3 VALUES(3, 'three');
277: INSERT INTO t3 VALUES(4, 'four');
278: } {}
279: foreach {tn sql error ac data } {
280: 1 "UPDATE t3 SET b='one' WHERE a=3"
281: {column b is not unique} 1 {1 one 2 two 3 three 4 four}
282:
283: 2 "UPDATE OR REPLACE t3 SET b='one' WHERE a=3"
284: {} 1 {2 two 3 one 4 four}
285:
286: 3 "UPDATE OR FAIL t3 SET b='three'"
287: {column b is not unique} 1 {2 three 3 one 4 four}
288:
289: 4 "UPDATE OR IGNORE t3 SET b='three' WHERE a=3"
290: {} 1 {2 three 3 one 4 four}
291:
292: 5 "UPDATE OR ABORT t3 SET b='three' WHERE a=3"
293: {column b is not unique} 1 {2 three 3 one 4 four}
294:
295: 6 "BEGIN" {} 0 {2 three 3 one 4 four}
296:
297: 7 "UPDATE t3 SET b='three' WHERE a=3"
298: {column b is not unique} 0 {2 three 3 one 4 four}
299:
300: 8 "UPDATE OR ABORT t3 SET b='three' WHERE a=3"
301: {column b is not unique} 0 {2 three 3 one 4 four}
302:
303: 9 "UPDATE OR FAIL t3 SET b='two'"
304: {column b is not unique} 0 {2 two 3 one 4 four}
305:
306: 10 "UPDATE OR IGNORE t3 SET b='four' WHERE a=3"
307: {} 0 {2 two 3 one 4 four}
308:
309: 11 "UPDATE OR REPLACE t3 SET b='four' WHERE a=3"
310: {} 0 {2 two 3 four}
311:
312: 12 "UPDATE OR ROLLBACK t3 SET b='four'"
313: {column b is not unique} 1 {2 three 3 one 4 four}
314: } {
315: do_catchsql_test e_update-1.8.$tn.1 $sql [list [expr {$error!=""}] $error]
316: do_execsql_test e_update-1.8.$tn.2 {SELECT * FROM t3} [list {*}$data]
317: do_test e_update-1.8.$tn.3 {sqlite3_get_autocommit db} $ac
318: }
319:
320:
321:
322: # EVIDENCE-OF: R-12123-54095 The table-name specified as part of an
323: # UPDATE statement within a trigger body must be unqualified.
324: #
325: # EVIDENCE-OF: R-09690-36749 In other words, the database-name. prefix
326: # on the table name of the UPDATE is not allowed within triggers.
327: #
328: do_update_tests e_update-2.1 -error {
329: qualified table names are not allowed on INSERT, UPDATE, and DELETE statements within triggers
330: } {
331: 1 {
332: CREATE TRIGGER tr1 AFTER INSERT ON t1 BEGIN
333: UPDATE main.t2 SET a=1, b=2, c=3;
334: END;
335: } {}
336:
337: 2 {
338: CREATE TRIGGER tr1 BEFORE UPDATE ON t2 BEGIN
339: UPDATE aux.t1 SET a=1, b=2;
340: END;
341: } {}
342:
343: 3 {
344: CREATE TRIGGER tr1 AFTER DELETE ON t4 BEGIN
345: UPDATE main.t1 SET a=1, b=2;
346: END;
347: } {}
348: }
349:
350: # EVIDENCE-OF: R-06085-13761 Unless the table to which the trigger is
351: # attached is in the TEMP database, the table being updated by the
352: # trigger program must reside in the same database as it.
353: #
354: do_update_tests e_update-2.2 -error {
355: no such table: %s
356: } {
357: 1 {
358: CREATE TRIGGER tr1 AFTER INSERT ON t1 BEGIN
359: UPDATE t4 SET x=x+1;
360: END;
361: INSERT INTO t1 VALUES(1, 2);
362: } "main.t4"
363:
364: 2 {
365: CREATE TRIGGER aux.tr1 AFTER INSERT ON t5 BEGIN
366: UPDATE t4 SET x=x+1;
367: END;
368: INSERT INTO t5 VALUES(1, 2);
369: } "aux.t4"
370: }
371: do_execsql_test e_update-2.2.X {
372: DROP TRIGGER tr1;
373: DROP TRIGGER aux.tr1;
374: } {}
375:
376: # EVIDENCE-OF: R-29512-54644 If the table to which the trigger is
377: # attached is in the TEMP database, then the unqualified name of the
378: # table being updated is resolved in the same way as it is for a
379: # top-level statement (by searching first the TEMP database, then the
380: # main database, then any other databases in the order they were
381: # attached).
382: #
383: do_execsql_test e_update-2.3.0 {
384: SELECT 'main', tbl_name FROM main.sqlite_master WHERE type = 'table'
385: UNION ALL
386: SELECT 'temp', tbl_name FROM sqlite_temp_master WHERE type = 'table'
387: UNION ALL
388: SELECT 'aux', tbl_name FROM aux.sqlite_master WHERE type = 'table'
389: } [list {*}{
390: main t1
391: main t2
392: main t3
393: main t6
394: temp t4
395: temp t6
396: aux t1
397: aux t5
398: }]
399: do_execsql_test e_update-2.3.1 {
400: DELETE FROM main.t6;
401: DELETE FROM temp.t6;
402: INSERT INTO main.t6 VALUES(1, 2);
403: INSERT INTO temp.t6 VALUES(1, 2);
404:
405: CREATE TRIGGER temp.tr1 AFTER INSERT ON t4 BEGIN
406: UPDATE t6 SET x=x+1;
407: END;
408:
409: INSERT INTO t4 VALUES(1, 2);
410: SELECT * FROM main.t6;
411: SELECT * FROM temp.t6;
412: } {1 2 2 2}
413: do_execsql_test e_update-2.3.2 {
414: DELETE FROM main.t1;
415: DELETE FROM aux.t1;
416: INSERT INTO main.t1 VALUES(1, 2);
417: INSERT INTO aux.t1 VALUES(1, 2);
418:
419: CREATE TRIGGER temp.tr2 AFTER DELETE ON t4 BEGIN
420: UPDATE t1 SET a=a+1;
421: END;
422:
423: DELETE FROM t4;
424: SELECT * FROM main.t1;
425: SELECT * FROM aux.t1;
426: } {2 2 1 2}
427: do_execsql_test e_update-2.3.3 {
428: DELETE FROM aux.t5;
429: INSERT INTO aux.t5 VALUES(1, 2);
430:
431: INSERT INTO t4 VALUES('x', 'y');
432: CREATE TRIGGER temp.tr3 AFTER UPDATE ON t4 BEGIN
433: UPDATE t5 SET a=a+1;
434: END;
435:
436: UPDATE t4 SET x=10;
437: SELECT * FROM aux.t5;
438: } {2 2}
439:
440: # EVIDENCE-OF: R-19619-42762 The INDEXED BY and NOT INDEXED clauses are
441: # not allowed on UPDATE statements within triggers.
442: #
443: do_update_tests e_update-2.4 -error {
444: the %s %s clause is not allowed on UPDATE or DELETE statements within triggers
445: } {
446: 1 {
447: CREATE TRIGGER tr1 AFTER INSERT ON t2 BEGIN
448: UPDATE t1 INDEXED BY i1 SET a=a+1;
449: END;
450: } {INDEXED BY}
451:
452: 2 {
453: CREATE TRIGGER tr1 AFTER INSERT ON t2 BEGIN
454: UPDATE t1 NOT INDEXED SET a=a+1;
455: END;
456: } {NOT INDEXED}
457: }
458:
459: ifcapable update_delete_limit {
460:
461: # EVIDENCE-OF: R-57359-59558 The LIMIT and ORDER BY clauses for UPDATE
462: # are unsupported within triggers, regardless of the compilation options
463: # used to build SQLite.
464: #
465: do_update_tests e_update-2.5 -error {
466: near "%s": syntax error
467: } {
468: 1 {
469: CREATE TRIGGER tr1 AFTER INSERT ON t2 BEGIN
470: UPDATE t1 SET a=a+1 LIMIT 10;
471: END;
472: } {LIMIT}
473:
474: 2 {
475: CREATE TRIGGER tr1 AFTER INSERT ON t2 BEGIN
476: UPDATE t1 SET a=a+1 ORDER BY a LIMIT 10;
477: END;
478: } {ORDER}
479:
480: 3 {
481: CREATE TRIGGER tr1 AFTER INSERT ON t2 BEGIN
482: UPDATE t1 SET a=a+1 ORDER BY a LIMIT 10 OFFSET 2;
483: END;
484: } {ORDER}
485:
486: 4 {
487: CREATE TRIGGER tr1 AFTER INSERT ON t2 BEGIN
488: UPDATE t1 SET a=a+1 LIMIT 10 OFFSET 2;
489: END;
490: } {LIMIT}
491: }
492:
493: # EVIDENCE-OF: R-59581-44104 If SQLite is built with the
494: # SQLITE_ENABLE_UPDATE_DELETE_LIMIT compile-time option then the syntax
495: # of the UPDATE statement is extended with optional ORDER BY and LIMIT
496: # clauses
497: #
498: # EVIDENCE-OF: R-45169-39597 -- syntax diagram update-stmt-limited
499: #
500: do_update_tests e_update-3.0 {
501: 1 "UPDATE t1 SET a=b LIMIT 5" {}
502: 2 "UPDATE t1 SET a=b LIMIT 5-1 OFFSET 2+2" {}
503: 3 "UPDATE t1 SET a=b LIMIT 2+2, 16/4" {}
504: 4 "UPDATE t1 SET a=b ORDER BY a LIMIT 5" {}
505: 5 "UPDATE t1 SET a=b ORDER BY a LIMIT 5-1 OFFSET 2+2" {}
506: 6 "UPDATE t1 SET a=b ORDER BY a LIMIT 2+2, 16/4" {}
507: 7 "UPDATE t1 SET a=b WHERE a>2 LIMIT 5" {}
508: 8 "UPDATE t1 SET a=b WHERE a>2 LIMIT 5-1 OFFSET 2+2" {}
509: 9 "UPDATE t1 SET a=b WHERE a>2 LIMIT 2+2, 16/4" {}
510: 10 "UPDATE t1 SET a=b WHERE a>2 ORDER BY a LIMIT 5" {}
511: 11 "UPDATE t1 SET a=b WHERE a>2 ORDER BY a LIMIT 5-1 OFFSET 2+2" {}
512: 12 "UPDATE t1 SET a=b WHERE a>2 ORDER BY a LIMIT 2+2, 16/4" {}
513: }
514:
515: do_execsql_test e_update-3.1.0 {
516: CREATE TABLE t7(q, r, s);
517: INSERT INTO t7 VALUES(1, 'one', 'X');
518: INSERT INTO t7 VALUES(2, 'two', 'X');
519: INSERT INTO t7 VALUES(3, 'three', 'X');
520: INSERT INTO t7 VALUES(4, 'four', 'X');
521: INSERT INTO t7 VALUES(5, 'five', 'X');
522: INSERT INTO t7 VALUES(6, 'six', 'X');
523: INSERT INTO t7 VALUES(7, 'seven', 'X');
524: INSERT INTO t7 VALUES(8, 'eight', 'X');
525: INSERT INTO t7 VALUES(9, 'nine', 'X');
526: INSERT INTO t7 VALUES(10, 'ten', 'X');
527: } {}
528:
529: # EVIDENCE-OF: R-58862-44169 If an UPDATE statement has a LIMIT clause,
530: # the maximum number of rows that will be updated is found by evaluating
531: # the accompanying expression and casting it to an integer value.
532: #
533: do_update_tests e_update-3.1 -query { SELECT s FROM t7 } {
534: 1 "UPDATE t7 SET s = q LIMIT 5" {1 2 3 4 5 X X X X X}
535: 2 "UPDATE t7 SET s = r WHERE q>2 LIMIT 4" {1 2 three four five six X X X X}
536: 3 "UPDATE t7 SET s = q LIMIT 0" {1 2 three four five six X X X X}
537: }
538:
539: # EVIDENCE-OF: R-63582-45120 A negative value is interpreted as "no limit".
540: #
541: do_update_tests e_update-3.2 -query { SELECT s FROM t7 } {
542: 1 "UPDATE t7 SET s = q LIMIT -1" {1 2 3 4 5 6 7 8 9 10}
543: 2 "UPDATE t7 SET s = r WHERE q>4 LIMIT -1"
544: {1 2 3 4 five six seven eight nine ten}
545: 3 "UPDATE t7 SET s = 'X' LIMIT -1" {X X X X X X X X X X}
546: }
547:
548: # EVIDENCE-OF: R-18628-11938 If the LIMIT expression evaluates to
549: # non-negative value N and the UPDATE statement has an ORDER BY clause,
550: # then all rows that would be updated in the absence of the LIMIT clause
551: # are sorted according to the ORDER BY and the first N updated.
552: #
553: do_update_tests e_update-3.3 -query { SELECT s FROM t7 } {
554: 1 "UPDATE t7 SET s = q ORDER BY r LIMIT 3" {X X X 4 5 X X 8 X X}
555: 2 "UPDATE t7 SET s = r ORDER BY r DESC LIMIT 2" {X two three 4 5 X X 8 X X}
556: 3 "UPDATE t7 SET s = q ORDER BY q DESC LIMIT 5" {X two three 4 5 6 7 8 9 10}
557:
558: X "UPDATE t7 SET s = 'X'" {X X X X X X X X X X}
559: }
560:
561: # EVIDENCE-OF: R-30955-38324 If the UPDATE statement also has an OFFSET
562: # clause, then it is similarly evaluated and cast to an integer value.
563: # If the OFFSET expression evaluates to a non-negative value M, then the
564: # first M rows are skipped and the following N rows updated instead.
565: #
566: do_update_tests e_update-3.3 -query { SELECT s FROM t7 } {
567: 1 "UPDATE t7 SET s = q ORDER BY q LIMIT 3 OFFSET 2" {X X 3 4 5 X X X X X}
568: 2 "UPDATE t7 SET s = q ORDER BY q DESC LIMIT 2, 3 " {X X 3 4 5 6 7 8 X X}
569:
570: X "UPDATE t7 SET s = 'X'" {X X X X X X X X X X}
571: }
572:
573: # EVIDENCE-OF: R-19486-35828 If the UPDATE statement has no ORDER BY
574: # clause, then all rows that would be updated in the absence of the
575: # LIMIT clause are assembled in an arbitrary order before applying the
576: # LIMIT and OFFSET clauses to determine which are actually updated.
577: #
578: # In practice, "arbitrary order" is rowid order. This is also tested
579: # by e_update-3.2.* above.
580: #
581: do_update_tests e_update-3.4 -query { SELECT s FROM t7 } {
582: 1 "UPDATE t7 SET s = q LIMIT 4, 2" {X X X X 5 6 X X X X}
583: 2 "UPDATE t7 SET s = q LIMIT 2 OFFSET 7" {X X X X 5 6 X 8 9 X}
584: }
585:
586: # EVIDENCE-OF: R-10927-26133 The ORDER BY clause on an UPDATE statement
587: # is used only to determine which rows fall within the LIMIT. The order
588: # in which rows are modified is arbitrary and is not influenced by the
589: # ORDER BY clause.
590: #
591: do_execsql_test e_update-3.5.0 {
592: CREATE TABLE t8(x);
593: CREATE TRIGGER tr7 BEFORE UPDATE ON t7 BEGIN
594: INSERT INTO t8 VALUES(old.q);
595: END;
596: } {}
597: do_update_tests e_update-3.5 -query { SELECT x FROM t8 ; DELETE FROM t8 } {
598: 1 "UPDATE t7 SET s = q ORDER BY r LIMIT -1" {1 2 3 4 5 6 7 8 9 10}
599: 2 "UPDATE t7 SET s = q ORDER BY r ASC LIMIT -1" {1 2 3 4 5 6 7 8 9 10}
600: 3 "UPDATE t7 SET s = q ORDER BY r DESC LIMIT -1" {1 2 3 4 5 6 7 8 9 10}
601: 4 "UPDATE t7 SET s = q ORDER BY q DESC LIMIT 5" {6 7 8 9 10}
602: }
603:
604:
605: } ;# ifcapable update_delete_limit
606:
607: finish_test
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