From 41a4ab7a19274d18e207e3ed0933e6058ff559f6 Mon Sep 17 00:00:00 2001 From: cantor Date: Wed, 27 Feb 2008 18:27:53 +0000 Subject: [PATCH] Allow reduction of isolation level via config. git-svn-id: https://svn.middleware.georgetown.edu/cpp-sp/trunk@2749 cb58f699-b61c-0410-a6fe-9272a202ed29 --- odbc-store/odbc-store.cpp | 22 +++++++++++++++++++--- 1 file changed, 19 insertions(+), 3 deletions(-) diff --git a/odbc-store/odbc-store.cpp b/odbc-store/odbc-store.cpp index 4c1ac89..45f684e 100644 --- a/odbc-store/odbc-store.cpp +++ b/odbc-store/odbc-store.cpp @@ -92,6 +92,7 @@ CREATE TABLE texts ( namespace { static const XMLCh cleanupInterval[] = UNICODE_LITERAL_15(c,l,e,a,n,u,p,I,n,t,e,r,v,a,l); + static const XMLCh isolationLevel[] = UNICODE_LITERAL_14(i,s,o,l,a,t,i,o,n,L,e,v,e,l); static const XMLCh ConnectionString[] = UNICODE_LITERAL_16(C,o,n,n,e,c,t,i,o,n,S,t,r,i,n,g); // RAII for ODBC handles @@ -185,6 +186,7 @@ namespace { SQLHENV m_henv; string m_connstring; + long m_isolation; }; StorageService* ODBCStorageServiceFactory(const DOMElement* const & e) @@ -253,7 +255,7 @@ namespace { }; ODBCStorageService::ODBCStorageService(const DOMElement* e) : m_log(Category::getInstance("XMLTooling.StorageService")), - m_cleanupInterval(900), shutdown_wait(NULL), cleanup_thread(NULL), shutdown(false), m_henv(SQL_NULL_HANDLE) + m_cleanupInterval(900), shutdown_wait(NULL), cleanup_thread(NULL), shutdown(false), m_henv(SQL_NULL_HANDLE), m_isolation(SQL_TXN_SERIALIZABLE) { #ifdef _DEBUG xmltooling::NDC ndc("ODBCStorageService"); @@ -265,6 +267,20 @@ ODBCStorageService::ODBCStorageService(const DOMElement* e) : m_log(Category::ge if (!m_cleanupInterval) m_cleanupInterval = 900; + auto_ptr_char iso(e ? e->getAttributeNS(NULL,isolationLevel) : NULL); + if (iso.get() && *iso.get()) { + if (!strcmp(iso.get(),"SERIALIZABLE")) + m_isolation = SQL_TXN_SERIALIZABLE; + else if (!strcmp(iso.get(),"REPEATABLE_READ")) + m_isolation = SQL_TXN_REPEATABLE_READ; + else if (!strcmp(iso.get(),"READ_COMMITTED")) + m_isolation = SQL_TXN_READ_COMMITTED; + else if (!strcmp(iso.get(),"READ_UNCOMMITTED")) + m_isolation = SQL_TXN_READ_UNCOMMITTED; + else + throw XMLToolingException("Unknown transaction isolationLevel property."); + } + if (m_henv == SQL_NULL_HANDLE) { // Enable connection pooling. SQLSetEnvAttr(SQL_NULL_HANDLE, SQL_ATTR_CONNECTION_POOLING, (void*)SQL_CP_ONE_PER_HENV, 0); @@ -357,9 +373,9 @@ SQLHDBC ODBCStorageService::getHDBC() throw IOException("ODBC StorageService failed to connect to database."); } - sr = SQLSetConnectAttr(handle, SQL_ATTR_TXN_ISOLATION, (SQLPOINTER)SQL_TXN_SERIALIZABLE, NULL); + sr = SQLSetConnectAttr(handle, SQL_ATTR_TXN_ISOLATION, (SQLPOINTER)m_isolation, NULL); if (!SQL_SUCCEEDED(sr)) - throw IOException("ODBC StorageService failed to enable transaction isolation."); + throw IOException("ODBC StorageService failed to set transaction isolation level."); return handle; } -- 2.1.4