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# 2016 March 3
#
# 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.
#
#***********************************************************************
set testdir [file dirname $argv0]
source $testdir/tester.tcl
set testprefix tempdb2
db close
sqlite3 db ""
proc int2str {i} { string range [string repeat "$i." 450] 0 899 }
db func int2str int2str
#-------------------------------------------------------------------------
#
# 1.1: Write a big transaction to the db. One so large that it forces
# the file to be created and the cache flushed to disk on COMMIT.
#
# 1.2: Write a small transaction - one small enough that it remains in
# memory on COMMIT. All the pages of table [t1] are now dirty.
#
# 1.3: Delete the contents of [t1]. This moves all of its leaves to the
# free-list and causes the btree layer to call PagerDontWrite() on
# each of them.
#
# Then do a big update on table [t2]. So big that the former leaves
# of [t1] are forced out of the cache. Then roll back the transaction.
# If the PagerDontWrite() calls are honoured and the data is not written
# to disk, the update made in test 1.2 will be lost at this point. Or, if
# they are ignored (as they should be for temp databases), the update
# will be safely written out to disk before the cache entries are
# discarded.
#
do_execsql_test 1.1 {
PRAGMA page_size=1024;
PRAGMA cache_size=50;
BEGIN;
CREATE TABLE t1(a INTEGER PRIMARY KEY, b);
INSERT INTO t1 VALUES(1, int2str(1));
INSERT INTO t1 VALUES(2, int2str(1));
INSERT INTO t1 VALUES(3, int2str(1));
CREATE TABLE t2(a INTEGER PRIMARY KEY, b);
WITH c(x) AS ( VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<100 )
INSERT INTO t2 SELECT x, int2str(x) FROM c;
COMMIT;
PRAGMA lock_status;
} {main unlocked temp closed}
do_execsql_test 1.2 {
UPDATE t1 SET b=int2str(2);
SELECT b=int2str(2) FROM t1
} {1 1 1}
do_execsql_test 1.3 {
BEGIN;
DELETE FROM t1;
UPDATE t2 SET b=int2str(a+1);
ROLLBACK;
}
do_execsql_test 1.4 {
SELECT b=int2str(2) FROM t1
} {1 1 1}
finish_test
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