Question

我正在上课报告和课程计划，我想要完成的目标（到目前为止没有运气）是将数据从类Program和方法SaveRep（）发送到类Report方法Save（）并将其保存在此方法中。

如果问题制定得很糟，我很抱歉，我真的很抱歉，请帮忙。感谢

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Configuration;
using System.Data.SqlClient;

namespace Application
{
 class Program
 {
    static void Main(string[] args)
    {            
        //call method SaveRep
    }

    public void SaveRep(...)
    {
       int RepID = 1;
       string Data1 = "SomeData1"
       string Data2 = "SomeData2"

       //This method should send the data above to method Save() in Report class
       //data to this method will be provided from another method.
    }        
  }

  public class Report
  {
    private static int _repID;
    public int RepID
    {
        get { return _repID; }
        set { _repID = value; }
    }

    private static string _data1;       
    public string Data1
    {
        get { return _data1; }
        set { _data1 = value; }
    }

    private static string __data2;
    public string Data1
    {
        get { return _data2; }
        set { _data2 = value; }
    }

    public void Save()
    {
        string strConnectionString = (@"server=(local)\sqlexpress;Integrated Security=True;database=DataBase");

        SqlConnection connection = new SqlConnection(strConnectionString);
        connection.Open();

        // This method should save  all data (RepID,Data1,Data2)
        // to the DB, provided to her by SaveRep method from Program class.
        // Properties are columns from a database
    }
  }
}

Answer 1

    string connectionString = ....; //adjust your connection string

    string queryString = "INSERT INTO ....;"; //Adjust your query
    using (SqlConnection connection = new SqlConnection(
               connectionString))
    {
        using( SqlCommand command = new SqlCommand(
            queryString, connection))
        {
        connection.Open();
        command .ExecuteNonQuery();
       }
    }

Answer 2

public void Save()
{
  string yourConnString="Replace with Your Database ConnectionString";
  using(SqlConnection connection = new SqlConnection(yourConnString))
  {    
     string sqlStatement = "INSERT Table1(Data1) VALUES(@Data1)";
     using(SqlCommand cmd = new SqlCommand(sqlStatement, connection))
     {
        cmd.CommandType = CommandType.Text;
        cmd.Parameters.AddWithValue("@Data1",Data1);
       //add more parameters as needed  and update insert query

        try
        {
           connection.Open();
           cmd.ExecuteNonQuery();
        }
        catch(Exception ex)
        {
          //log error
        }    
     }
  }
 }

假设您的Data1是您的列名称。更新sqlStatement以获得相关列。

现在在SaveRep，您可以将其称为

 public void SaveRep()
 {
   Report objReport=new Report();
   objReport.Data1="Something somethinng";
   objReport.Save();
 }

Answer 3

前面的发言者没有注意到的一件小事是，你的Report课程严重受损。为什么在变量上使用static个关键字？不要那样做！好吧，除非你知道它做了什么，在这里我感觉你没有。将您的报告类更新为：

public class Report
{
    public int RepID {get;set;}
    public string Data1 {get;set;}
    public string Data2 {get;set;}

    public void Save()
    {
        // what others said
    }
}

＆＃39;静态＆＃39;在原始代码中，所有te变量都是全局/共享的。这意味着，如果您使用new创建500个报表对象，则它们将具有相同的ID，Data1和Data2。对这500个对象中的任何一个进行任何更改都会导致所有对象发生更改。但它会产生误导，对象不会改变。他们只会拥有相同的数据。看着＆＃34; ID＆＃34;字段，我认为您更希望单独的对象具有单独的数据以用于单独的记录。

将对象保存到数据库c＃

3 个答案: