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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).
+#
+
+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
+
+finish_test