SQLite

# 2016 November 18
#
# 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.
#
#***********************************************************************
# This file implements regression tests for SQLite library. The focus
# of this file is the sqlite3_snapshot_xxx() APIs.
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl
ifcapable !snapshot {finish_test; return}
set testprefix snapshot2

# This test does not work with the inmemory_journal permutation. The reason
# is that each connection opened as part of this permutation executes
# "PRAGMA journal_mode=memory", which fails if the database is in wal mode
# and there are one or more existing connections.
if {[permutation]=="inmemory_journal"} {
  finish_test
  return
}

#-------------------------------------------------------------------------
# Check that it is not possible to obtain a snapshot immediately after
# a wal mode database with an empty wal file is opened. But it is after
# the file has been written, even by some other connection.
#
do_execsql_test 1.0 {
  PRAGMA journal_mode = wal;
  CREATE TABLE t1(a, b, c);
  INSERT INTO t1 VALUES(1, 2, 3);
  INSERT INTO t1 VALUES(4, 5, 6);
} {wal}

db close
do_test 1.1.1 { list [file exists test.db] [file exists test.db-wal] } {1 0}

sqlite3 db test.db
do_execsql_test 1.1.2 { SELECT * FROM t1 } {1 2 3 4 5 6}

do_test 1.1.3 {
  execsql BEGIN
  list [catch { sqlite3_snapshot_get_blob db main } msg] $msg
} {1 SQLITE_ERROR}
execsql COMMIT

do_test 1.1.4 {
  execsql { INSERT INTO t1 VALUES(7, 8, 9) }
  execsql BEGIN
  string length [sqlite3_snapshot_get_blob db main]
} 48
execsql COMMIT

db close
do_test 1.2.1 { list [file exists test.db] [file exists test.db-wal] } {1 0}

sqlite3 db test.db
do_execsql_test 1.2.2 { SELECT * FROM t1 } {1 2 3 4 5 6 7 8 9}

do_test 1.2.3 {
  execsql BEGIN
  list [catch { sqlite3_snapshot_get_blob db main } msg] $msg
} {1 SQLITE_ERROR}
execsql COMMIT

do_test 1.2.4 {
  sqlite3 db2 test.db
  execsql { INSERT INTO t1 VALUES(10, 11, 12) } db2
  execsql BEGIN
  string length [sqlite3_snapshot_get_blob db main]
} 48
execsql COMMIT
db2 close


finish_test