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+#
+# The author disclaims copyright to this source code. In place of
+# a legal notice, here is a blessing:
+#
+# May you do good and not evil.
+# May you find forgiveness for yourself and forgive others.
+# May you share freely, never taking more than you give.
+#
+#***********************************************************************
+#
+# Tests to make sure that values returned by changes() and total_changes()
+# are updated properly, especially inside triggers
+#
+# Note 1: changes() remains constant within a statement and only updates
+# once the statement is finished (triggers count as part of
+# statement).
+# Note 2: changes() is changed within the context of a trigger much like
+# last_insert_rowid() (see lastinsert.test), but is restored once
+# the trigger exits.
+# Note 3: changes() is not changed by a change to a view (since everything
+# is done within instead of trigger context).
+#
+# $Id: laststmtchanges.test,v 1.7 2008/10/27 13:59:34 danielk1977 Exp $
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+# ----------------------------------------------------------------------------
+# 1.x - basic tests (no triggers)
+
+# changes() set properly after insert
+do_test laststmtchanges-1.1 {
+ catchsql {
+ create table t0 (x);
+ insert into t0 values (1);
+ insert into t0 values (1);
+ insert into t0 values (2);
+ insert into t0 values (2);
+ insert into t0 values (1);
+ insert into t0 values (1);
+ insert into t0 values (1);
+ insert into t0 values (2);
+ select changes(), total_changes();
+ }
+} {0 {1 8}}
+
+# changes() set properly after update
+do_test laststmtchanges-1.2 {
+ catchsql {
+ update t0 set x=3 where x=1;
+ select changes(), total_changes();
+ }
+} {0 {5 13}}
+
+# There was some goofy change-counting logic in sqlite3_exec() that
+# appears to have been left over from SQLite version 2. This test
+# makes sure it has been removed.
+#
+do_test laststmtchanges-1.2.1 {
+ db cache flush
+ sqlite3_exec_printf db {update t0 set x=4 where x=3; select 1;} {}
+ execsql {select changes()}
+} {5}
+
+# changes() unchanged within an update statement
+do_test laststmtchanges-1.3 {
+ execsql {update t0 set x=3 where x=4}
+ catchsql {
+ update t0 set x=x+changes() where x=3;
+ select count() from t0 where x=8;
+ }
+} {0 5}
+
+# changes() set properly after update on table where no rows changed
+do_test laststmtchanges-1.4 {
+ catchsql {
+ update t0 set x=77 where x=88;
+ select changes();
+ }
+} {0 0}
+
+# changes() set properly after delete from table
+do_test laststmtchanges-1.5 {
+ catchsql {
+ delete from t0 where x=2;
+ select changes();
+ }
+} {0 3}
+
+# All remaining tests involve triggers. Skip them if triggers are not
+# supported in this build.
+#
+ifcapable {!trigger} {
+ finish_test
+ return
+}
+
+
+# ----------------------------------------------------------------------------
+# 2.x - tests with after insert trigger
+
+# changes() changed properly after insert into table containing after trigger
+do_test laststmtchanges-2.1 {
+ set ::tc [db total_changes]
+ catchsql {
+ create table t1 (k integer primary key);
+ create table t2 (k integer primary key, v1, v2);
+ create trigger r1 after insert on t1 for each row begin
+ insert into t2 values (NULL, changes(), NULL);
+ update t0 set x=x;
+ update t2 set v2=changes();
+ end;
+ insert into t1 values (77);
+ select changes();
+ }
+} {0 1}
+
+# changes() unchanged upon entry into after insert trigger
+do_test laststmtchanges-2.2 {
+ catchsql {
+ select v1 from t2;
+ }
+} {0 3}
+
+# changes() changed properly by update within context of after insert trigger
+do_test laststmtchanges-2.3 {
+ catchsql {
+ select v2 from t2;
+ }
+} {0 5}
+
+# Total changes caused by firing the trigger above:
+#
+# 1 from "insert into t1 values(77)" +
+# 1 from "insert into t2 values (NULL, changes(), NULL);" +
+# 5 from "update t0 set x=x;" +
+# 1 from "update t2 set v2=changes();"
+#
+do_test laststmtchanges-2.4 {
+ expr [db total_changes] - $::tc
+} {8}
+
+# ----------------------------------------------------------------------------
+# 3.x - tests with after update trigger
+
+# changes() changed properly after update into table containing after trigger
+do_test laststmtchanges-3.1 {
+ catchsql {
+ drop trigger r1;
+ delete from t2; delete from t2;
+ create trigger r1 after update on t1 for each row begin
+ insert into t2 values (NULL, changes(), NULL);
+ delete from t0 where oid=1 or oid=2;
+ update t2 set v2=changes();
+ end;
+ update t1 set k=k;
+ select changes();
+ }
+} {0 1}
+
+# changes() unchanged upon entry into after update trigger
+do_test laststmtchanges-3.2 {
+ catchsql {
+ select v1 from t2;
+ }
+} {0 0}
+
+# changes() changed properly by delete within context of after update trigger
+do_test laststmtchanges-3.3 {
+ catchsql {
+ select v2 from t2;
+ }
+} {0 2}
+
+# ----------------------------------------------------------------------------
+# 4.x - tests with before delete trigger
+
+# changes() changed properly on delete from table containing before trigger
+do_test laststmtchanges-4.1 {
+ catchsql {
+ drop trigger r1;
+ delete from t2; delete from t2;
+ create trigger r1 before delete on t1 for each row begin
+ insert into t2 values (NULL, changes(), NULL);
+ insert into t0 values (5);
+ update t2 set v2=changes();
+ end;
+ delete from t1;
+ select changes();
+ }
+} {0 1}
+
+# changes() unchanged upon entry into before delete trigger
+do_test laststmtchanges-4.2 {
+ catchsql {
+ select v1 from t2;
+ }
+} {0 0}
+
+# changes() changed properly by insert within context of before delete trigger
+do_test laststmtchanges-4.3 {
+ catchsql {
+ select v2 from t2;
+ }
+} {0 1}
+
+# ----------------------------------------------------------------------------
+# 5.x - complex tests with temporary tables and nested instead of triggers
+# These tests cannot run if the library does not have view support enabled.
+
+ifcapable view&&tempdb {
+
+do_test laststmtchanges-5.1 {
+ catchsql {
+ drop table t0; drop table t1; drop table t2;
+ create temp table t0(x);
+ create temp table t1 (k integer primary key);
+ create temp table t2 (k integer primary key);
+ create temp view v1 as select * from t1;
+ create temp view v2 as select * from t2;
+ create temp table n1 (k integer primary key, n);
+ create temp table n2 (k integer primary key, n);
+ insert into t0 values (1);
+ insert into t0 values (2);
+ insert into t0 values (1);
+ insert into t0 values (1);
+ insert into t0 values (1);
+ insert into t0 values (2);
+ insert into t0 values (2);
+ insert into t0 values (1);
+ create temp trigger r1 instead of insert on v1 for each row begin
+ insert into n1 values (NULL, changes());
+ update t0 set x=x*10 where x=1;
+ insert into n1 values (NULL, changes());
+ insert into t1 values (NEW.k);
+ insert into n1 values (NULL, changes());
+ update t0 set x=x*10 where x=0;
+ insert into v2 values (100+NEW.k);
+ insert into n1 values (NULL, changes());
+ end;
+ create temp trigger r2 instead of insert on v2 for each row begin
+ insert into n2 values (NULL, changes());
+ insert into t2 values (1000+NEW.k);
+ insert into n2 values (NULL, changes());
+ update t0 set x=x*100 where x=0;
+ insert into n2 values (NULL, changes());
+ delete from t0 where x=2;
+ insert into n2 values (NULL, changes());
+ end;
+ insert into t1 values (77);
+ select changes();
+ }
+} {0 1}
+
+do_test laststmtchanges-5.2 {
+ catchsql {
+ delete from t1 where k=88;
+ select changes();
+ }
+} {0 0}
+
+do_test laststmtchanges-5.3 {
+ catchsql {
+ insert into v1 values (5);
+ select changes();
+ }
+} {0 0}
+
+do_test laststmtchanges-5.4 {
+ catchsql {
+ select n from n1;
+ }
+} {0 {0 5 1 0}}
+
+do_test laststmtchanges-5.5 {
+ catchsql {
+ select n from n2;
+ }
+} {0 {0 1 0 3}}
+
+} ;# ifcapable view
+
+
+# ----------------------------------------------------------------------------
+# 6.x - Test "DELETE FROM <table>" in the absence of triggers
+#
+do_test laststmtchanges-6.1 {
+ execsql {
+ CREATE TABLE t3(a, b, c);
+ INSERT INTO t3 VALUES(1, 2, 3);
+ INSERT INTO t3 VALUES(4, 5, 6);
+ }
+} {}
+do_test laststmtchanges-6.2 {
+ execsql {
+ BEGIN;
+ DELETE FROM t3;
+ SELECT changes();
+ }
+} {2}
+do_test laststmtchanges-6.3 {
+ execsql {
+ ROLLBACK;
+ BEGIN;
+ DELETE FROM t3 WHERE a IS NOT NULL;
+ SELECT changes();
+ }
+} {2}
+do_test laststmtchanges-6.4 {
+ execsql {
+ ROLLBACK;
+ CREATE INDEX t3_i1 ON t3(a);
+ BEGIN;
+ DELETE FROM t3;
+ SELECT changes();
+ }
+} {2}
+do_test laststmtchanges-6.5 {
+ execsql { ROLLBACK }
+ set nTotalChange [execsql {SELECT total_changes()}]
+ expr 0
+} {0}
+do_test laststmtchanges-6.6 {
+ execsql {
+ SELECT total_changes();
+ DELETE FROM t3;
+ SELECT total_changes();
+ }
+} [list $nTotalChange [expr $nTotalChange+2]]
+
+finish_test
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