/// <summary>
 /// 构造方法
 /// </summary>
 public MySqlQueryModelVisitor()
 {
     this.queryPartsAggregator = new MySqlQueryPartsAggregator();
     this.parameterAggregator = new MySqlParameterAggregator();
 }
 /// <summary>
 /// 构造方法
 /// </summary>
 public MySqlQueryModelVisitor()
 {
     this.queryPartsAggregator = new MySqlQueryPartsAggregator();
     this.parameters = new List<object>();
 }