类定义（仿照LINQ）小ORM类

 public class MYORM
    {
        public String MysqlStr = "";
        
        public MYORM()
        {
            this.MysqlStr = "Select * from Userinfo where ";

        }
        public MYORM(String SQLStr)
        {
            if (SQLStr.ToString().Length > 0)
            {
                this.MysqlStr = this.MysqlStr + SQLStr;
            }
            else
            {
                this.MysqlStr =   "Select * from Userinfo where ";
        
            }
          
        }

        public MYORM ORM_On (String Where)
        {
            this.MysqlStr = this.MysqlStr+ Where;

            return new MYORM(MysqlStr);

        }

        public MYORM ORM_AND(String Where)
        {
            this.MysqlStr = this.MysqlStr + Where;

            return new MYORM(MysqlStr);

        }

        public MYORM  And (String Where)
        {
            this.MysqlStr = this.MysqlStr + Where;

            return new MYORM(MysqlStr);

        }

    }