Remove useless case in CommandRemote and detect internal errors in GeneratedKeysMode

h2/src/main/org/h2/command/CommandRemote.java

@@ -216,9 +216,6 @@ public class CommandRemote implements CommandInterface {
                         int mode = GeneratedKeysMode.valueOf(generatedKeysRequest);
                         transfer.writeInt(mode);
                         switch (mode) {
-                        case GeneratedKeysMode.NONE:
-                            readGeneratedKeys = false;
-                            break;
                         case GeneratedKeysMode.COLUMN_NUMBERS: {
                             int[] keys = (int[]) generatedKeysRequest;
                             transfer.writeInt(keys.length);

h2/src/main/org/h2/engine/GeneratedKeysMode.java

@@ -5,6 +5,9 @@
  */
 package org.h2.engine;
 
+import org.h2.api.ErrorCode;
+import org.h2.message.DbException;
+
 /**
  * Modes of generated keys' gathering.
  */
@@ -54,7 +57,8 @@ public final class GeneratedKeysMode {
         if (generatedKeysRequest instanceof String[]) {
             return COLUMN_NAMES;
         }
-        return NONE;
+        throw DbException.get(ErrorCode.INVALID_VALUE_2,
+                generatedKeysRequest == null ? "null" : generatedKeysRequest.toString());
     }
 
     private GeneratedKeysMode() {