Adding Delayed Durability to commit API(#1310)

Author: dbrownems

src/main/java/com/microsoft/sqlserver/jdbc/SQLServerConnection.java

@@ -3351,14 +3351,33 @@ final byte[] getTransactionDescriptor() {
 
     @Override
     public void commit() throws SQLServerException {
+        commit(false);
+    }
+    
+    /**
+     * Makes all changes made since the previous
+     * commit/rollback permanent and releases any database locks
+     * currently held by this <code>Connection</code> object.
+     * This method should be
+     * used only when auto-commit mode has been disabled.
+     * 
+     * @param delayedDurability flag to indicate whether the commit will occur with delayed durability on.
+     * @throws SQLServerException Exception if a database access error occurs,
+     */
+    public void commit(boolean delayedDurability) throws SQLServerException {
         loggerExternal.entering(loggingClassName, "commit");
         if (loggerExternal.isLoggable(Level.FINER) && Util.isActivityTraceOn()) {
             loggerExternal.finer(toString() + " ActivityId: " + ActivityCorrelator.getNext().toString());
         }
 
         checkClosed();
         if (!databaseAutoCommitMode)
-            connectionCommand("IF @@TRANCOUNT > 0 COMMIT TRAN", "Connection.commit");
+        {
+            if (!delayedDurability)
+                connectionCommand("IF @@TRANCOUNT > 0 COMMIT TRAN", "Connection.commit");
+            else
+                connectionCommand("IF @@TRANCOUNT > 0 COMMIT TRAN WITH ( DELAYED_DURABILITY =  ON )", "Connection.commit");
+        }
         loggerExternal.exiting(loggingClassName, "commit");
     }