void BuildSql(string field_type, MemberNode memberNode, ValueNode valueNode, ExpressionType op)
 {
     if(valueNode.Value == null)
     {
         ResolveNullValue(memberNode, op);
     }
     else
     {
         _builder.QueryByField(field_type/*memberNode.TableName*/, memberNode.TableName, memberNode.FieldName, _operationDictionary[op], valueNode.Value);
     }
 }
 void BuildSql(ValueNode valueNode, MemberNode memberNode, ExpressionType op)
 {
     BuildSql(memberNode, valueNode, op);
 }