1# The author disclaims copyright to this source code.  In place of
2# a legal notice, here is a blessing:
3#
4#    May you do good and not evil.
5#    May you find forgiveness for yourself and forgive others.
6#    May you share freely, never taking more than you give.
7#
8#***********************************************************************
9#
10# Tests to make sure that values returned by changes() and total_changes()
11# are updated properly, especially inside triggers
12#
13# Note 1: changes() remains constant within a statement and only updates
14#         once the statement is finished (triggers count as part of
15#         statement).
16# Note 2: changes() is changed within the context of a trigger much like
17#         last_insert_rowid() (see lastinsert.test), but is restored once
18#         the trigger exits.
19# Note 3: changes() is not changed by a change to a view (since everything
20#         is done within instead of trigger context).
21#
22
23set testdir [file dirname $argv0]
24source $testdir/tester.tcl
25
26# ----------------------------------------------------------------------------
27# 1.x - basic tests (no triggers)
28
29# changes() set properly after insert
30do_test laststmtchanges-1.1 {
31    catchsql {
32        create table t0 (x);
33        insert into t0 values (1);
34        insert into t0 values (1);
35        insert into t0 values (2);
36        insert into t0 values (2);
37        insert into t0 values (1);
38        insert into t0 values (1);
39        insert into t0 values (1);
40        insert into t0 values (2);
41        select changes(), total_changes();
42    }
43} {0 {1 8}}
44
45# changes() set properly after update
46do_test laststmtchanges-1.2 {
47    catchsql {
48        update t0 set x=3 where x=1;
49        select changes(), total_changes();
50    }
51} {0 {5 13}}
52
53# changes() unchanged within an update statement
54do_test laststmtchanges-1.3 {
55    catchsql {
56        update t0 set x=x+changes() where x=3;
57        select count() from t0 where x=8;
58    }
59} {0 5}
60
61# changes() set properly after update on table where no rows changed
62do_test laststmtchanges-1.4 {
63    catchsql {
64        update t0 set x=77 where x=88;
65        select changes();
66    }
67} {0 0}
68
69# changes() set properly after delete from table
70do_test laststmtchanges-1.5 {
71    catchsql {
72        delete from t0 where x=2;
73        select changes();
74    }
75} {0 3}
76
77# ----------------------------------------------------------------------------
78# 2.x - tests with after insert trigger
79
80# changes() changed properly after insert into table containing after trigger
81do_test laststmtchanges-2.1 {
82    set ::tc [db total_changes]
83    catchsql {
84        create table t1 (k integer primary key);
85        create table t2 (k integer primary key, v1, v2);
86        create trigger r1 after insert on t1 for each row begin
87            insert into t2 values (NULL, changes(), NULL);
88            update t0 set x=x;
89            update t2 set v2=changes();
90        end;
91        insert into t1 values (77);
92        select changes();
93    }
94} {0 1}
95
96# changes() unchanged upon entry into after insert trigger
97do_test laststmtchanges-2.2 {
98    catchsql {
99        select v1 from t2;
100    }
101} {0 3}
102
103# changes() changed properly by update within context of after insert trigger
104do_test laststmtchanges-2.3 {
105    catchsql {
106        select v2 from t2;
107    }
108} {0 5}
109
110# Total changes caused by firing the trigger above:
111#
112#   1 from "insert into t1 values(77)" +
113#   1 from "insert into t2 values (NULL, changes(), NULL);" +
114#   5 from "update t0 set x=x;" +
115#   1 from "update t2 set v2=changes();"
116#
117do_test laststmtchanges-2.4 {
118  expr [db total_changes] - $::tc
119} {8}
120
121# ----------------------------------------------------------------------------
122# 3.x - tests with after update trigger
123
124# changes() changed properly after update into table containing after trigger
125do_test laststmtchanges-3.1 {
126    catchsql {
127        drop trigger r1;
128        delete from t2; delete from t2;
129        create trigger r1 after update on t1 for each row begin
130            insert into t2 values (NULL, changes(), NULL);
131            delete from t0 where oid=1 or oid=2;
132            update t2 set v2=changes();
133        end;
134        update t1 set k=k;
135        select changes();
136    }
137} {0 1}
138
139# changes() unchanged upon entry into after update trigger
140do_test laststmtchanges-3.2 {
141    catchsql {
142        select v1 from t2;
143    }
144} {0 0}
145
146# changes() changed properly by delete within context of after update trigger
147do_test laststmtchanges-3.3 {
148    catchsql {
149        select v2 from t2;
150    }
151} {0 2}
152
153# ----------------------------------------------------------------------------
154# 4.x - tests with before delete trigger
155
156# changes() changed properly on delete from table containing before trigger
157do_test laststmtchanges-4.1 {
158    catchsql {
159        drop trigger r1;
160        delete from t2; delete from t2;
161        create trigger r1 before delete on t1 for each row begin
162            insert into t2 values (NULL, changes(), NULL);
163            insert into t0 values (5);
164            update t2 set v2=changes();
165        end;
166        delete from t1;
167        select changes();
168    }
169} {0 1}
170
171# changes() unchanged upon entry into before delete trigger
172do_test laststmtchanges-4.2 {
173    catchsql {
174        select v1 from t2;
175    }
176} {0 0}
177
178# changes() changed properly by insert within context of before delete trigger
179do_test laststmtchanges-4.3 {
180    catchsql {
181        select v2 from t2;
182    }
183} {0 1}
184
185# ----------------------------------------------------------------------------
186# 5.x - complex tests with temporary tables and nested instead of triggers
187
188do_test laststmtchanges-5.1 {
189    catchsql {
190        drop table t0; drop table t1; drop table t2;
191        create temp table t0(x);
192        create temp table t1 (k integer primary key);
193        create temp table t2 (k integer primary key);
194        create temp view v1 as select * from t1;
195        create temp view v2 as select * from t2;
196        create temp table n1 (k integer primary key, n);
197        create temp table n2 (k integer primary key, n);
198        insert into t0 values (1);
199        insert into t0 values (2);
200        insert into t0 values (1);
201        insert into t0 values (1);
202        insert into t0 values (1);
203        insert into t0 values (2);
204        insert into t0 values (2);
205        insert into t0 values (1);
206        create temp trigger r1 instead of insert on v1 for each row begin
207            insert into n1 values (NULL, changes());
208            update t0 set x=x*10 where x=1;
209            insert into n1 values (NULL, changes());
210            insert into t1 values (NEW.k);
211            insert into n1 values (NULL, changes());
212            update t0 set x=x*10 where x=0;
213            insert into v2 values (100+NEW.k);
214            insert into n1 values (NULL, changes());
215        end;
216        create temp trigger r2 instead of insert on v2 for each row begin
217            insert into n2 values (NULL, changes());
218            insert into t2 values (1000+NEW.k);
219            insert into n2 values (NULL, changes());
220            update t0 set x=x*100 where x=0;
221            insert into n2 values (NULL, changes());
222            delete from t0 where x=2;
223            insert into n2 values (NULL, changes());
224        end;
225        insert into t1 values (77);
226        select changes();
227    }
228} {0 1}
229
230do_test laststmtchanges-5.2 {
231    catchsql {
232        delete from t1 where k=88;
233        select changes();
234    }
235} {0 0}
236
237do_test laststmtchanges-5.3 {
238    catchsql {
239        insert into v1 values (5);
240        select changes();
241    }
242} {0 0}
243
244do_test laststmtchanges-5.4 {
245    catchsql {
246        select n from n1;
247    }
248} {0 {0 5 1 0}}
249
250do_test laststmtchanges-5.5 {
251    catchsql {
252        select n from n2;
253    }
254} {0 {0 1 0 3}}
255
256finish_test
257
258