kms访问数据库的方式(该篇只是作为个人笔记,不具有任何公共参考意图)

项目类型:winform

语言:C#

服务程序:webservice(webservice我本人也不了解,在下一章中会总结一下对它的概念的简单理解)

情景描述:简单创建一个窗体,实现学生信息(姓名、性别)的新增和查询

一、保存按钮下的事件:

 1  private void btnSave_Click(object sender, EventArgs e)
 2         {
 3             try
 4             { 
 5                 List<SqlPara> list = new List<SqlPara>();
 6                 list.Add(new SqlPara("stuName",txtName.Text));
 7                 list.Add(new SqlPara("stuSex",txtSex.Text));
 8                 SqlParasEntity sps = new SqlParasEntity(OperType.Execute, "AddStudentInfo", list);
 9                 int result = SqlHelper.ExecuteNoQuery(sps);
10                 if(result > 0)
11                 {
12                     MessageBox.Show("操作成功!");
13                     return;
14                 }
15             }   
16             catch(Exception ex)
17             {
18                 MessageBox.Show(ex.ToString());
19                 return;
20             }
21         }

二、创建方法中使用到的类(使用一个类库统一管理这些类型)

 1 //参数对象
 2     public class SqlPara
 3     {
 4         public string ParaName
 5         { get; set; }
 6         public object ParaValue
 7         { get; set; }
 8         public SqlPara(string n, object o)
 9         {
10             this.ParaName = n;
11             this.ParaValue = o;
12         }
13     }
14 
15 //表示数据库操作类型
16     public enum OperType
17     {
18         Query = 1,//查询
19 
20         Execute = 2//执行
21     }
22 
23 //实例化对象(构造函数的重载,实现不同数据库操作的对象实例化)
24     public class SqlParasEntity
25     {
26         public OperType OperType
27         { get; set; }
28         public string procedureName
29         { get; set; }
30         public List<SqlPara> ParaList
31         { get; set; }
32         public SqlParasEntity(OperType type, string proName, List<SqlPara> list)
33         {
34             OperType = type;
35             procedureName = proName;
36             ParaList = list;
37         }
38         public SqlParasEntity(OperType type,string proName)
39         {
40             OperType = type;
41             procedureName = proName;
42         }
43     }

 

三、第一大点中第九行的方法:int result = SqlHelper.ExecuteNoQuery(sps);

 1 namespace DAL
 2 {
 3     public class SqlHelper
 4     {
 5         private static int ver = 1;
 6         public static int ExecuteNoQuery(SqlParasEntity ent)
 7         {
 8             int flag = ExecuteNoQuery(ent, ver);
 9             return flag;
10         }
11         private static int ExecuteNoQuery(SqlParasEntity ent, int ver)
12         {
13             DataSet ds = new DataSet();
14             DataTable dt = new DataTable(ent.procedureName);
15             dt.Columns.Add("pname");
16             dt.Columns.Add("pvalue");
17             ds.Tables.Add(dt);
18             if (ent.ParaList == null)
19             {
20                 List<SqlPara> list = new List<SqlPara>();
21                 ent.ParaList = list;
22             }
23             foreach(var item in ent.ParaList)
24             {
25                 if (item.ParaValue.GetType() == typeof(DataTable))
26                 {
27                     DataTable table = (item.ParaValue as DataTable).Copy();
28                     table.TableName = item.ParaName;
29                     ds.Tables.Add(table);
30                 }
31                 else
32                 {
33                     dt.Rows.Add(item.ParaName,item.ParaValue);
34                 }
35             }
36             SqlResult result = new SqlResult();
37             JsonSerializerSettings settings = new JsonSerializerSettings();
38             settings.DateFormatString = "yyyy-MM-dd HH:mm:ss";
39             SqlParasTable data = new SqlParasTable(ent.OperType,ds);
40             string json = JsonConvert.SerializeObject(data,settings);
41             result = HttpHelper.HttpPost(string.Format("ver={0}&json={1}",ver,json));
42             if (result.State == 1)
43             {
44                 int count = 0;
45                 if (StringHelper.IsNumberId(result.Result))
46                 {
47                     count = Convert.ToInt32(result.Result);//这个为什么这样做
48                 }
49                 return count;
50             }
51             else
52             {
53                 throw new Exception("返回信息:\r\n" + result.Result.Replace("数据库访问异常:","").Replace("错误信息","").Trim());
54             }
55         }
56     }
57 }

 

四、第三大点中41行代码方法:result = HttpHelper.HttpPost(string.Format("ver={0}&json={1}",ver,json));

1、先创建使用到的类型,三大点中36,39行 

 

 1 public class SqlResult
 2     {
 3         /// <summary>
 4         /// sql执行返回状态:1成功,2失败
 5         /// </summary>
 6         public int State
 7         { get; set; }
 8 
 9         /// <summary>
10         /// 如果state是1,则返回结果集(DataSet);State=0,返回错误信息
11         /// </summary>
12         public string Result
13         { get; set; }
14     }
15 
16 
17 /// <summary>
18     /// 数据库操作提交参数
19     /// </summary>
20     public class SqlParasTable
21     {
22         public OperType OperType
23         { get; set; }
24 
25         /// <summary>
26         /// 参数集合,表类型
27         /// <para>第一个 table 是简单的数据类型,键值类型</para>
28         /// <para>第二 table 放表类型的参数(例如批量导入数据时)</para>
29         /// </summary>
30         public DataSet ParasDataSet
31         { get; set; }
32         public SqlParasTable(OperType type,DataSet ds)
33         {
34             OperType = type;
35             ParasDataSet = ds;
36         }
37     }

 

 

 

 2、三大点中41行方法:

 1 namespace DAL
 2 {
 3     class HttpHelper
 4     {
 5         public static string urlPage = "kms1.ashx";
 6        // static string domain = "http://192.168.2.139:8090/";
 7         static string domain = "http://localhost:28383/";
 8         public static SqlResult HttpPost(string data)
 9         {
10             string url = domain + urlPage;
11             SqlResult result = new SqlResult();
12             try
13             {
14                 string json = "";
15                 HttpWebRequest req = (HttpWebRequest)WebRequest.Create(url);
16                 req.Proxy = null;
17                 req.Method = "post";
18                 req.ContentType = "application/x-www-form-urlencoded";
19                 req.Timeout = 600000;
20 
21                 byte[] btbody = Encoding.UTF8.GetBytes(data);
22                 req.ContentLength = btbody.Length;
23                 using (Stream st = req.GetRequestStream())
24                 {
25                     st.Write(btbody, 0, btbody.Length);
26                     st.Close();
27                     st.Dispose();
28                 }
29                 WebResponse wr = req.GetResponse();
30                 using (StreamReader sr = new StreamReader(wr.GetResponseStream()))
31                 {
32                     json = sr.ReadToEnd();
33                     sr.Close();
34                     sr.Dispose();
35                 }
36                 wr.Close();
37                 result = JsonConvert.DeserializeObject<SqlResult>(json);
38             }
39             catch (WebException ex)
40             {
41                 result.State = 0;
42                 result.Result = "远程访问错误,\r\n" + ex.Message;
43             }
44             catch (Exception ex)
45             {
46                 result.State = 0;
47                 result.Result = ex.Message;
48             }
49             return result;
50         }
51     }
52 }

章结尾:上面的数据库访问失败了。公司项目代码是这样的逻辑,但我没有使用过webservice服务,想自己搭建然后访问,但是没有成功。

上面的内容供自己参考一下数据传输的设计理念,后面要掌握一下webservice服务,实现数据访问

查询的操作方式和上面基本一致,将数据库放回结果转换为自己想要的数据类型即可(DataSet)

 

posted @ 2019-04-29 08:50  EFLand  阅读(373)  评论(0编辑  收藏  举报