added multi-session sys table tests

Author: aleks-f

Data/SQLite/src/SQLiteStatementImpl.cpp

@@ -88,7 +88,6 @@ void SQLiteStatementImpl::compileImpl()
 			if (SQLITE_OK != sqlite3_exec(_pDB, "delete from sys.dual where 1 <> 1;", 0, 0, 0))
 				throw ExecutionException("Error updating system database.");
 		}
-
 		_bindBegin = bindings().begin();
 	}
 

Data/SQLite/testsuite/src/SQLiteTest.cpp

@@ -2560,18 +2560,41 @@ void SQLiteTest::testReconnect()
 void SQLiteTest::testSystemTable()
 {
 	Session session (Poco::Data::SQLite::Connector::KEY, "dummy.db");
+	int cntFile = 0;
+	session << "DROP TABLE IF EXISTS Test", now;
+	session << "CREATE TABLE Test (Test INTEGER)", now;
+	session << "INSERT INTO Test VALUES (1)", now;
+	session << "SELECT count(*) FROM Test", into(cntFile), now;
+	assert (1 == cntFile);
 
-	int cnt = -1;
-	session << "SELECT count(*) FROM sys.dual", into(cnt), now;
-	assert (0 == cnt);
+	int cntMem = -1;
+	session << "SELECT count(*) FROM sys.dual", into(cntMem), now;
+	assert (0 == cntMem);
 
 	session << "INSERT INTO sys.dual VALUES ('test')", now;
-	session << "SELECT count(*) FROM sys.dual", into(cnt), now;
-	assert (1 == cnt);
+	session << "SELECT count(*) FROM sys.dual", into(cntMem), now;
+	assert (1 == cntMem);
+
+	// connect another session
+	Session session2(Poco::Data::SQLite::Connector::KEY, "dummy.db");
+	// verify it has it's own sys table
+	session2 << "SELECT count(*) FROM sys.dual", into(cntMem), now;
+	assert (0 == cntMem);
+	// verify it shares the file table
+	session2 << "SELECT count(*) FROM Test", into(cntFile), now;
+	assert (1 == cntFile);
+	session2 << "INSERT INTO sys.dual VALUES ('test')", now;
+	session2 << "SELECT count(*) FROM sys.dual", into(cntMem), now;
+	assert (1 == cntMem);
 
 	session << "DELETE FROM sys.dual", now;
-	session << "SELECT count(*) FROM sys.dual", into(cnt), now;
-	assert (0 == cnt);
+	session << "SELECT count(*) FROM sys.dual", into(cntMem), now;
+	assert (0 == cntMem);
+	session2 << "SELECT count(*) FROM sys.dual", into(cntMem), now;
+	assert (1 == cntMem);
+	session2 << "DELETE FROM sys.dual", now;
+	session2 << "SELECT count(*) FROM sys.dual", into(cntMem), now;
+	assert (0 == cntMem);
 
 	try
 	{