反射生成SQL语句

 public static int Reg(Model ml)
         {
             bool b = true;
             Visit vt = new Visit();
             StringBuilder builder = new StringBuilder("insert into UsersTable (");
             Type type = ml.GetType();
             PropertyInfo[] per = type.GetProperties();
             List<SqlParameter> sqlpar = new List<SqlParameter>();
             for (int i = ; i < per.Length; i++)
             {
                 if (!per[i].Name.Equals("Uid") ||!string.IsNullOrEmpty(per[i].GetValue(ml, null).ToString()))
                 {
                     if (i == per.Length - )
                     {
                         if (b == true)
                         {
                             builder.Append(per[i].Name + ")values(");
                             sqlpar.Add(new SqlParameter("@" + per[i].Name, per[i].GetValue(ml, null)));
                             i = ;
                             b = false;
                         }
                         else
                         {
                             builder.Append("@" + per[i].Name + ")");
                         }
                     }
                     else
                     {
                         if (b == true)
                         {
                             builder.Append(per[i].Name + ",");
                             sqlpar.Add(new SqlParameter("@" + per[i].Name, per[i].GetValue(ml, null)));
                         }
                         else
                         {
                             builder.Append("@"+per[i].Name + ",");
                         }
                     }
                 }
             }
             return vt.ExecuteNonQuery(builder.ToString(), sqlpar.ToArray());
         }

SQL插入

 //查询
         public static DataSet Login(Model ml)
         {
             Visit vt = new Visit();
             Type type = ml.GetType();
             PropertyInfo[] per = type.GetProperties();
             List<SqlParameter> sqlpar = new List<SqlParameter>();
             StringBuilder builder = new StringBuilder("select Uid from UsersTable where ");
             for (int i = ; i < per.Length; i++)
             {
                 if (per[i].GetValue(ml, null)!=null&& !per[i].Name.Equals("Uid"))
                 {
                     builder.Append(per[i].Name + "=@" + per[i].Name+" and ");
                     sqlpar.Add(new SqlParameter("@"+per[i].Name,per[i].GetValue(ml,null)));
                 }

             }
             string sqlStr = builder.ToString().Substring(, builder.ToString().LastIndexOf("and"));
             return vt.SqlDataAdapter(sqlStr, sqlpar.ToArray());
         }

SQL查询

 public static bool upDate(Model ml)
         {
             Visit vt = new Visit();
             StringBuilder sbuilder = new StringBuilder("Update UsersTable set ");

             Type ModelType = ml.GetType();
             PropertyInfo[] ProPer = ModelType.GetProperties();
             List<SqlParameter> sqlpara = new List<SqlParameter>();

             foreach (PropertyInfo item in ProPer)
             {
                 if (!string.IsNullOrEmpty(item.GetValue(ml,null).ToString())&& !item.Name.Equals("Uid"))
                 {
                     sbuilder.Append(item.Name + "=@" + item.Name+",");
                     sqlpara.Add(new SqlParameter("@" + item.Name, item.GetValue(ml, null)));
                 }
             }
             string str = sbuilder.ToString().Trim(',');
             str += " where Uid=@Uid";
             sqlpara.Add(new SqlParameter("@Uid", ml.Uid));
             return vt.ExecuteNonQuery(str, sqlpara.ToArray()) > ;

         }

SQL更新