sql server support

src/main/java/com/alibaba/druid/sql/dialect/sqlserver/ast/SQLServerObject.java

@@ -2,6 +2,6 @@ package com.alibaba.druid.sql.dialect.sqlserver.ast;
 
 import com.alibaba.druid.sql.dialect.transact.ast.TransactSQLObject;
 
-public interface SqlServerObject extends TransactSQLObject {
+public interface SQLServerObject extends TransactSQLObject {
 
 }

src/main/java/com/alibaba/druid/sql/dialect/sqlserver/ast/SQLServerSelect.java

@@ -0,0 +1,6 @@
+package com.alibaba.druid.sql.dialect.sqlserver.ast;
+
+
+public class SQLServerSelect {
+
+}

src/main/java/com/alibaba/druid/sql/dialect/transact/ast/TransactSQLObjectImpl.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 1999-2011 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.druid.sql.dialect.transact.ast;
+
+import com.alibaba.druid.sql.ast.SQLObjectImpl;
+import com.alibaba.druid.sql.dialect.oracle.visitor.OracleASTVisitor;
+import com.alibaba.druid.sql.visitor.SQLASTVisitor;
+
+public abstract class TransactSQLObjectImpl extends SQLObjectImpl implements TransactSQLObject {
+
+    private static final long serialVersionUID = 1L;
+
+    public TransactSQLObjectImpl(){
+
+    }
+
+    @Override
+    protected void accept0(SQLASTVisitor visitor) {
+        this.accept0((OracleASTVisitor) visitor);
+    }
+
+    public abstract void accept0(OracleASTVisitor visitor);
+}

src/main/java/com/alibaba/druid/sql/dialect/transact/ast/TransactSQLSelect.java

@@ -0,0 +1,6 @@
+package com.alibaba.druid.sql.dialect.transact.ast;
+
+
+public class TransactSQLSelect {
+
+}