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SQLite training in Houston TX on 2019-11-05 (details)
Part of the 2019 Tcl Conference

Artifact 64006c84c1c616657e237c7ad6532b765611cf64:


# 2009 August 17
#
# 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.
#
#***********************************************************************
#
# Check that reading the database schema from within an active transaction
# does not establish a SHARED lock on the database file if one is not
# already held (or, more accurately, that the SHARED lock is released after
# reading the database schema).
#

set testdir [file dirname $argv0]
source $testdir/tester.tcl

do_test lock7-1.1 {
  execsql { CREATE TABLE t1(a, b) }
  db close

  sqlite3 db1 test.db
  sqlite3 db2 test.db

  db1 eval {BEGIN}
  db2 eval {BEGIN}
} {}

do_test lock7-1.2 {
  execsql { PRAGMA lock_status } db1
} {main unlocked temp closed}
do_test lock7-1.3 {
  execsql { PRAGMA lock_status } db2
} {main unlocked temp closed}

do_test lock7-1.4 {
  catchsql { INSERT INTO t1 VALUES(1, 1) } db1
} {0 {}}
do_test lock7-1.5 {
  catchsql { INSERT INTO t1 VALUES(2, 2) } db2
} {1 {database is locked}}

do_test lock7-1.6 {
  execsql { PRAGMA lock_status } db1
} {main reserved temp closed}
do_test lock7-1.7 {
  execsql { PRAGMA lock_status } db2
} {main unlocked temp closed}

do_test lock7-1.8 {
  execsql { COMMIT } db1
} {}

db1 close
db2 close

finish_test