content: /**
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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.wasp.jdbc.expression;
  
  import com.alibaba.wasp.jdbc.JdbcException;
  import com.alibaba.wasp.jdbc.value.Value;
  
  /**
   * The interface for client side (remote) and server side parameters.
   */
  public interface ParameterInterface {
  
      /**
       * Set the value of the parameter.
       *
       * @param value the new value
       * @param closeOld if the old value (if one is set) should be closed
       */
      void setValue(Value value, boolean closeOld);
  
      /**
       * Get the value of the parameter if set.
       *
       * @return the value or null
       */
      Value getParamValue();
  
      /**
       * Check if the value is set.
       *
       * @throws com.alibaba.wasp.jdbc.JdbcException if not set.
       */
      void checkSet() throws JdbcException;
  
      /**
       * Is the value of a parameter set.
       *
       * @return true if set
       */
      boolean isValueSet();
  
      /**
       * Get the expected data type of the parameter if no value is set, or the
       * data type of the value if one is set.
       *
       * @return the data type
       */
      int getType();
  
      /**
       * Get the expected precision of this parameter.
       *
       * @return the expected precision
       */
      long getPrecision();
  
      /**
       * Get the expected scale of this parameter.
       *
       * @return the expected scale
       */
      int getScale();
  
      /**
       * Check if this column is nullable.
       *
       * @return Column.NULLABLE_*
       */
      int getNullable();
  
  }
  