# 2009 April 01
#
# 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.
#
#***********************************************************************
#
# $Id: shared6.test,v 1.1 2009/04/01 09:41:54 danielk1977 Exp $
set testdir [file dirname $argv0]
source $testdir/tester.tcl
ifcapable !shared_cache { finish_test ; return }
do_test shared7-1.1.1 {
execsql {
CREATE TABLE t1(a, b);
CREATE TABLE t2(c, d);
CREATE TABLE t3(e, f);
}
} {}
do_test shared7-1.1.2 {
set ::enable_shared_cache [sqlite3_enable_shared_cache 1]
sqlite3_enable_shared_cache
} {1}
do_test shared7-1.1.3 {
sqlite3 db1 test.db
sqlite3 db2 test.db
} {}
# Exclusive shared-cache locks. Test the following:
#
# 1.2.1: If [db1] has an exclusive lock, [db2] cannot read.
# 1.2.2: If [db1] has an exclusive lock, [db1] can read.
# 1.2.3: If [db1] has a non-exclusive write-lock, [db2] can read.
#
do_test shared7-1.2.1 {
execsql { SELECT * FROM t1 } db2 ;# Cache a compiled statement
execsql { BEGIN EXCLUSIVE } db1
catchsql { SELECT * FROM t1 } db2 ;# Execute the cached compiled statement
} {1 {database table is locked}}
do_test shared7-1.2.2 {
execsql { SELECT * FROM t1 } db1
} {}
do_test shared7-1.2.3 {
execsql {
COMMIT;
BEGIN;
INSERT INTO t2 VALUES(3, 4);
} db1
execsql { SELECT * FROM t1 } db2
} {}
do_test shared7-1.2.X {
execsql { COMMIT } db1
} {}
# Regular shared-cache locks. Verify the following:
#
# 1.3.1: If [db1] has a write-lock on t1, [db1] can read from t1.
# 1.3.2: If [db1] has a write-lock on t1, [db2] can read from t2.
# 1.3.3: If [db1] has a write-lock on t1, [db2] cannot read from t1.
# 1.3.4: If [db1] has a write-lock on t1, [db2] cannot write to t1.
# 1.3.5: If [db1] has a read-lock on t1, [db2] can read from t1.
# 1.3.6: If [db1] has a read-lock on t1, [db2] cannot write to t1.
#
do_test shared7-1.3.1 {
execsql {
BEGIN;
INSERT INTO t1 VALUES(1, 2);
} db1
execsql { SELECT * FROM t1 } db1
} {1 2}
do_test shared7-1.3.2 {
execsql { SELECT * FROM t2 } db2
} {3 4}
do_test shared7-1.3.3 {
catchsql { SELECT * FROM t1 } db2
} {1 {database table is locked: t1}}
do_test shared7-1.3.4 {
catchsql { INSERT INTO t2 VALUES(1, 2) } db2
} {1 {database table is locked}}
do_test shared7-1.3.5 {
execsql {
COMMIT;
BEGIN;
SELECT * FROM t1;
} db1
execsql { SELECT * FROM t1 } db2
} {1 2}
do_test shared7-1.3.5 {
catchsql { INSERT INTO t1 VALUES(5, 6) } db2
} {1 {database table is locked: t1}}
do_test shared7-1.3.X {
execsql { COMMIT } db1
} {}
# Read-uncommitted mode.
#
# For these tests, connection [db2] is in read-uncommitted mode.
#
# 1.4.1: If [db1] has a write-lock on t1, [db2] can still read from t1.
# 1.4.2: If [db1] has a write-lock on the db schema (sqlite_master table),
# [db2] cannot read from the schema.
# 1.4.3: If [db1] has a read-lock on t1, [db2] cannot write to t1.
#
do_test shared7-1.4.1 {
execsql { PRAGMA read_uncommitted = 1 } db2
execsql {
BEGIN;
INSERT INTO t1 VALUES(5, 6);
} db1
execsql { SELECT * FROM t1 } db2
} {1 2 5 6}
do_test shared7-1.4.2 {
execsql { CREATE TABLE t4(a, b) } db1
catchsql { SELECT * FROM t1 } db2
} {1 {database table is locked}}
do_test shared7-1.4.3 {
execsql {
COMMIT;
BEGIN;
SELECT * FROM t1;
} db1
catchsql { INSERT INTO t1 VALUES(7, 8) } db2
} {1 {database table is locked: t1}}
do_test shared7-1.X {
db1 close
db2 close
} {}
sqlite3_enable_shared_cache $::enable_shared_cache
finish_test