# 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 value returned by last_statement_change_count() # (LSCC) is updated properly, especially inside triggers # # Note 1: LSCC remains constant within a statement and only updates once # the statement is finished (triggers count as part of statement) # Note 2: LSCC 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: LSCC 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) # LSCC 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 last_statement_change_count(); } } {0 1} # LSCC set properly after update do_test laststmtchanges-1.2 { catchsql { update t0 set x=3 where x=1; select last_statement_change_count(); } } {0 5} # LSCC unchanged within an update statement do_test laststmtchanges-1.3 { catchsql { update t0 set x=x+last_statement_change_count() where x=3; select count() from t0 where x=8; } } {0 5} # LSCC 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 last_statement_change_count(); } } {0 0} # LSCC set properly after delete from table do_test laststmtchanges-1.5 { catchsql { delete from t0 where x=2; select last_statement_change_count(); } } {0 3} # ---------------------------------------------------------------------------- # 2.x - tests with after insert trigger # LSCC changed properly after insert into table containing after trigger do_test laststmtchanges-2.1 { 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, last_statement_change_count(), NULL); update t0 set x=x; update t2 set v2=last_statement_change_count(); end; insert into t1 values (77); select last_statement_change_count(); } } {0 1} # LSCC unchanged upon entry into after insert trigger do_test laststmtchanges-2.2 { catchsql { select v1 from t2; } } {0 3} # LSCC changed properly by update within context of after insert trigger do_test laststmtchanges-2.3 { catchsql { select v2 from t2; } } {0 5} # ---------------------------------------------------------------------------- # 3.x - tests with after update trigger # LSCC 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, last_statement_change_count(), NULL); delete from t0 where oid=1 or oid=2; update t2 set v2=last_statement_change_count(); end; update t1 set k=k; select last_statement_change_count(); } } {0 1} # LSCC unchanged upon entry into after update trigger do_test laststmtchanges-3.2 { catchsql { select v1 from t2; } } {0 0} # LSCC 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 # LSCC 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, last_statement_change_count(), NULL); insert into t0 values (5); update t2 set v2=last_statement_change_count(); end; delete from t1; select last_statement_change_count(); } } {0 1} # LSCC unchanged upon entry into before delete trigger do_test laststmtchanges-4.2 { catchsql { select v1 from t2; } } {0 0} # LSCC 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 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, last_statement_change_count()); update t0 set x=x*10 where x=1; insert into n1 values (NULL, last_statement_change_count()); insert into t1 values (NEW.k); insert into n1 values (NULL, last_statement_change_count()); update t0 set x=x*10 where x=0; insert into v2 values (100+NEW.k); insert into n1 values (NULL, last_statement_change_count()); end; create temp trigger r2 instead of insert on v2 for each row begin insert into n2 values (NULL, last_statement_change_count()); insert into t2 values (1000+NEW.k); insert into n2 values (NULL, last_statement_change_count()); update t0 set x=x*100 where x=0; insert into n2 values (NULL, last_statement_change_count()); delete from t0 where x=2; insert into n2 values (NULL, last_statement_change_count()); end; insert into t1 values (77); select last_statement_change_count(); } } {0 1} do_test laststmtchanges-5.2 { catchsql { delete from t1 where k=88; select last_statement_change_count(); } } {0 0} do_test laststmtchanges-5.3 { catchsql { insert into v1 values (5); select last_statement_change_count(); } } {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}} finish_test