271 lines
7.8 KiB
Plaintext
271 lines
7.8 KiB
Plaintext
# The author disclaims copyright to this source code. In place of
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# a legal notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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#
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#***********************************************************************
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#
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# Tests to make sure that values returned by changes() and total_changes()
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# are updated properly, especially inside triggers
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#
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# Note 1: changes() remains constant within a statement and only updates
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# once the statement is finished (triggers count as part of
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# statement).
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# Note 2: changes() is changed within the context of a trigger much like
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# last_insert_rowid() (see lastinsert.test), but is restored once
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# the trigger exits.
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# Note 3: changes() is not changed by a change to a view (since everything
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# is done within instead of trigger context).
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#
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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# ----------------------------------------------------------------------------
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# 1.x - basic tests (no triggers)
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# changes() set properly after insert
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do_test laststmtchanges-1.1 {
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catchsql {
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create table t0 (x);
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insert into t0 values (1);
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insert into t0 values (1);
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insert into t0 values (2);
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insert into t0 values (2);
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insert into t0 values (1);
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insert into t0 values (1);
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insert into t0 values (1);
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insert into t0 values (2);
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select changes(), total_changes();
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}
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} {0 {1 8}}
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# changes() set properly after update
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do_test laststmtchanges-1.2 {
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catchsql {
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update t0 set x=3 where x=1;
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select changes(), total_changes();
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}
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} {0 {5 13}}
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# changes() unchanged within an update statement
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do_test laststmtchanges-1.3 {
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catchsql {
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update t0 set x=x+changes() where x=3;
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select count() from t0 where x=8;
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}
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} {0 5}
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# changes() set properly after update on table where no rows changed
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do_test laststmtchanges-1.4 {
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catchsql {
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update t0 set x=77 where x=88;
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select changes();
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}
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} {0 0}
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# changes() set properly after delete from table
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do_test laststmtchanges-1.5 {
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catchsql {
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delete from t0 where x=2;
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select changes();
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}
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} {0 3}
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# All remaining tests involve triggers. Skip them if triggers are not
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# supported in this build.
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#
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ifcapable {!trigger} {
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finish_test
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return
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}
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# ----------------------------------------------------------------------------
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# 2.x - tests with after insert trigger
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# changes() changed properly after insert into table containing after trigger
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do_test laststmtchanges-2.1 {
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set ::tc [db total_changes]
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catchsql {
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create table t1 (k integer primary key);
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create table t2 (k integer primary key, v1, v2);
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create trigger r1 after insert on t1 for each row begin
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insert into t2 values (NULL, changes(), NULL);
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update t0 set x=x;
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update t2 set v2=changes();
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end;
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insert into t1 values (77);
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select changes();
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}
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} {0 1}
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# changes() unchanged upon entry into after insert trigger
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do_test laststmtchanges-2.2 {
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catchsql {
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select v1 from t2;
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}
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} {0 3}
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# changes() changed properly by update within context of after insert trigger
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do_test laststmtchanges-2.3 {
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catchsql {
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select v2 from t2;
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}
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} {0 5}
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# Total changes caused by firing the trigger above:
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#
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# 1 from "insert into t1 values(77)" +
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# 1 from "insert into t2 values (NULL, changes(), NULL);" +
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# 5 from "update t0 set x=x;" +
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# 1 from "update t2 set v2=changes();"
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#
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do_test laststmtchanges-2.4 {
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expr [db total_changes] - $::tc
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} {8}
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# ----------------------------------------------------------------------------
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# 3.x - tests with after update trigger
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# changes() changed properly after update into table containing after trigger
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do_test laststmtchanges-3.1 {
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catchsql {
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drop trigger r1;
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delete from t2; delete from t2;
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create trigger r1 after update on t1 for each row begin
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insert into t2 values (NULL, changes(), NULL);
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delete from t0 where oid=1 or oid=2;
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update t2 set v2=changes();
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end;
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update t1 set k=k;
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select changes();
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}
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} {0 1}
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# changes() unchanged upon entry into after update trigger
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do_test laststmtchanges-3.2 {
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catchsql {
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select v1 from t2;
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}
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} {0 0}
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# changes() changed properly by delete within context of after update trigger
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do_test laststmtchanges-3.3 {
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catchsql {
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select v2 from t2;
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}
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} {0 2}
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# ----------------------------------------------------------------------------
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# 4.x - tests with before delete trigger
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# changes() changed properly on delete from table containing before trigger
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do_test laststmtchanges-4.1 {
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catchsql {
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drop trigger r1;
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delete from t2; delete from t2;
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create trigger r1 before delete on t1 for each row begin
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insert into t2 values (NULL, changes(), NULL);
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insert into t0 values (5);
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update t2 set v2=changes();
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end;
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delete from t1;
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select changes();
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}
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} {0 1}
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# changes() unchanged upon entry into before delete trigger
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do_test laststmtchanges-4.2 {
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catchsql {
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select v1 from t2;
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}
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} {0 0}
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# changes() changed properly by insert within context of before delete trigger
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do_test laststmtchanges-4.3 {
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catchsql {
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select v2 from t2;
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}
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} {0 1}
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# ----------------------------------------------------------------------------
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# 5.x - complex tests with temporary tables and nested instead of triggers
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# These tests cannot run if the library does not have view support enabled.
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ifcapable view&&tempdb {
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do_test laststmtchanges-5.1 {
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catchsql {
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drop table t0; drop table t1; drop table t2;
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create temp table t0(x);
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create temp table t1 (k integer primary key);
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create temp table t2 (k integer primary key);
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create temp view v1 as select * from t1;
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create temp view v2 as select * from t2;
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create temp table n1 (k integer primary key, n);
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create temp table n2 (k integer primary key, n);
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insert into t0 values (1);
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insert into t0 values (2);
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insert into t0 values (1);
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insert into t0 values (1);
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insert into t0 values (1);
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insert into t0 values (2);
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insert into t0 values (2);
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insert into t0 values (1);
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create temp trigger r1 instead of insert on v1 for each row begin
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insert into n1 values (NULL, changes());
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update t0 set x=x*10 where x=1;
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insert into n1 values (NULL, changes());
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insert into t1 values (NEW.k);
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insert into n1 values (NULL, changes());
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update t0 set x=x*10 where x=0;
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insert into v2 values (100+NEW.k);
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insert into n1 values (NULL, changes());
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end;
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create temp trigger r2 instead of insert on v2 for each row begin
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insert into n2 values (NULL, changes());
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insert into t2 values (1000+NEW.k);
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insert into n2 values (NULL, changes());
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update t0 set x=x*100 where x=0;
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insert into n2 values (NULL, changes());
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delete from t0 where x=2;
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insert into n2 values (NULL, changes());
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end;
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insert into t1 values (77);
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select changes();
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}
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} {0 1}
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do_test laststmtchanges-5.2 {
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catchsql {
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delete from t1 where k=88;
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select changes();
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}
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} {0 0}
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do_test laststmtchanges-5.3 {
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catchsql {
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insert into v1 values (5);
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select changes();
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}
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} {0 0}
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do_test laststmtchanges-5.4 {
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catchsql {
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select n from n1;
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}
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} {0 {0 5 1 0}}
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do_test laststmtchanges-5.5 {
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catchsql {
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select n from n2;
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}
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} {0 {0 1 0 3}}
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} ;# ifcapable view
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finish_test
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