dapper利用DynamicParameters构建动态参数查询

var age=23;var name="张";          
StringBuilder condition = new StringBuilder();
            condition.Append("where 1=1");
            DynamicParameters p = new DynamicParameters();

            if (age>0)
            {
                condition.Append(" AND Age>@age");

                p.Add("@age", age, System.Data.DbType.String);//对于Add方法，第一个参数可以不带@前缀，源代码里有subString(1),就给处理了
            }


            if (!string.IsNullOrWhiteSpace(name))//
            {
                condition.Append(" AND ChineseName like @name");
                p.Add("@name", "%"+name+"%", System.Data.DbType.String);//对于like语句，源代码的有bug还是故意不处理? 这里必须拼接%
            }
            using (var conn = ConnectionFactory.GetOpenConnection())
           {
             var result=  conn.GetList<T>(conditions,parameters);
            
           }

static string Clean(string name)
        {
            if (!string.IsNullOrEmpty(name))
            {
                switch (name[0])
                {
                    case ‘@‘:
                    case ‘:‘:
                    case ‘?‘:
                        return name.Substring(1);
                }
            }
            return name;
        }