string connectionString = "Data Source=SC-201607131829;Initial Catalog=Animal;Integrated Security=True";
  SqlConnection conn;

 public DataTable doSelect()
    {

      string sql = "select * from detial";

      using (conn = new SqlConnection(connectionString))
      {

        conn.Open();

        SqlDataAdapter da = new SqlDataAdapter(sql, conn);

        DataSet ds = new DataSet();

        da.Fill(ds);  //填充DataSet

        return ds.Tables[0];

      }
    }

public bool doInsert(string name, string skin, string weight)
    {

      string sql = "insert into detial(name,skin,weight)values(@name,@skin,@weight)";

      SqlParameter[] newAnimal = {
         new SqlParameter("name",name),
         new SqlParameter("skin",skin),
         new SqlParameter("weight",skin)
      };

      using (conn = new SqlConnection(connectionString))
      {
        SqlCommand com = new SqlCommand(sql, conn);
        try
        {
          if (newAnimal != null)
          {
            foreach (SqlParameter parameter in newAnimal)
            {
              com.Parameters.Add(parameter);

            }
          }
          conn.Open();

          int influence = com.ExecuteNonQuery();

          if (influence > 0)
          {

            return true;
          }
          else
          {

            return false;
          }
        }
        catch (Exception exception)
        {
          return false;
        }
      }
    }

public bool doDelete(string name)
    {

      string sql = "delete from detial where name = @name";

      SqlParameter[] deleteParameter = { new SqlParameter("name", name) };

      using (conn = new SqlConnection(connectionString))
      {

        SqlCommand com = new SqlCommand(sql, conn);
        
        try
        {

          if (deleteParameter != null)
          {
            foreach (SqlParameter parameter in deleteParameter)
            {
              com.Parameters.Add(parameter);
            }
            
          }

          conn.Open();

          int influence = com.ExecuteNonQuery();

          if (influence > 0)
          {

            return true;
          }
          else
          {

            return false;
          }
        }
        catch (Exception exception)
        {
          return false;
        }
      }
    }

public bool doUpdate(string name , string skin) {

      string sql = "update detial set skin = @skin where name = @name";
      SqlParameter[] updateParameter = {
                    new SqlParameter("name",name),
                    new SqlParameter("skin",skin)
      };

      using (conn = new SqlConnection(connectionString)) {

        SqlCommand com = new SqlCommand(sql,conn);

          try {

            if (updateParameter != null) { 
              
              foreach(SqlParameter parameter in updateParameter){

                com.Parameters.Add(parameter);

              } 
            }

            conn.Open();

            int influence = com.ExecuteNonQuery();

            if (influence > 0)
            {

              return true;
            }
            else
            {

              return false;
            }
          
          }catch(Exception exception){

            return false;
          }
      }

    }