1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Text;
5
6 namespace ConsoleApplication1
7 {
8 //实体类 (封装字段、属性)
9 public class Nation
10 {
11 private string code;
12
13 public string Code
14 {
15 get { return code; }
16 set { code = value; }
17 }
18
19 private string name;
20
21 public string Name
22 {
23 get { return name; }
24 set { name = value; }
25 }
26 }
27 }
实体类
1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Text;
5 using System.Data.SqlClient;
6
7 namespace ConsoleApplication1
8 {
9 //数据连接类：提供数据连接对象
10 public class DataConnection
11 {
12 private static string connstr = "server=.; database=mydb; user=sa; pwd=ray;";
13
14 public static SqlConnection Conn
15 {
16 get { return new SqlConnection(connstr);}
17 }
18 }
19 }
数据连接类
1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Text;
5 using System.Data.SqlClient;
6
7 namespace ConsoleApplication1
8 {
9 //数据访问类（实现增删改查操作）
10 class NationData
11 {
12 private SqlConnection _conn; //连接对象
13 private SqlCommand _cmd; //命令对象
14 private SqlDataReader _dr; //读取器对象
15
16 //构造方法，初始化成员（连接对象、命令对象）
17 public NationData()
18 {
19 _conn = DataConnection.Conn; //对连接对象进行初始化
20 _cmd = _conn.CreateCommand(); //对命令对象进行初始化
21 }
22
23 /// <summary>
24 /// 添加数据方法
25 /// </summary>
26 /// <param name="code">编号</param>
27 /// <param name="name">名称</param>
28 /// <returns>bool</returns>
29 public bool Add(string code, string name)
30 {
31 _cmd.CommandText = "insert into Nation values(@code,@name)";
32 _cmd.Parameters.Clear();
33 _cmd.Parameters.AddWithValue("@code", code);
34 _cmd.Parameters.AddWithValue("@name", name);
35
36 _conn.Open();
37 int n = _cmd.ExecuteNonQuery();
38 _conn.Close();
39
40 if (n > 0)
41 {
42 return true;
43 }
44 else
45 {
46 return false;
47 }
48 }
49
50 /// <summary>
51 /// 查询所有数据方法
52 /// </summary>
53 /// <returns>List<T></returns>
54 public List<Nation> Select()
55 {
56 _cmd.CommandText = "select *from Nation";
57 _conn.Open();
58 _dr = _cmd.ExecuteReader();
59
60 //定义一个空的集合
61 List<Nation> list=new List<Nation>();
62
63 if (_dr.HasRows)
64 {
65 while (_dr.Read())
66 {
67 //造一个Nation对象
68 Nation data = new Nation();
69 data.Code = _dr["Code"].ToString();
70 data.Name = _dr["Name"].ToString();
71
72 //扔到集合中
73 list.Add(data);
74 }
75 }
76 _conn.Close();
77 return list;
78 }
79
80 /// <summary>
81 /// 根据条件查询方法
82 /// </summary>
83 /// <param name="code">编号</param>
84 /// <returns>List<T></returns>
85 public List<Nation> Select(string code)
86 {
87 _cmd.CommandText = "select *from Nation where [email protected]";
88 _cmd.Parameters.Clear();
89 _cmd.Parameters.AddWithValue("@code",code);
90 _conn.Open();
91 _dr = _cmd.ExecuteReader();
92
93
94 //定义一个空的集合
95 List<Nation> list = new List<Nation>();
96
97 if (_dr.HasRows)
98 {
99 while (_dr.Read())
100 {
101 //造一个Nation对象
102 Nation data = new Nation();
103 data.Code = _dr["Code"].ToString();
104 data.Name = _dr["Name"].ToString();
105
106 //扔到集合中
107 list.Add(data);
108 }
109 }
110 _conn.Close();
111 return list;
112 }
113
114 /// <summary>
115 /// 删除数据方法
116 /// </summary>
117 /// <param name="code">编号</param>
118 /// <returns>bool</returns>
119 public bool Delete(string code)
120 {
121 _cmd.CommandText = "delete from Nation where [email protected]";
122 _cmd.Parameters.Clear();
123 _cmd.Parameters.AddWithValue("@code",code);
124
125 _conn.Open();
126 int n=_cmd.ExecuteNonQuery();
127 _conn.Close();
128
129 if ( n> 0)
130 {
131 return true;
132 }
133 else { return false; }
134 }
135
136 /// <summary>
137 /// 修改数据方法
138 /// </summary>
139 /// <param name="code">编号</param>
140 /// <param name="name">名称</param>
141 /// <returns>bool</returns>
142 public bool Update(string code,string name)
143 {
144 _cmd.CommandText = "update Nation set [email protected] where [email protected]";
145 _cmd.Parameters.Clear();
146 _cmd.Parameters.AddWithValue("@code",code);
147 _cmd.Parameters.AddWithValue("@name",name);
148
149 _conn.Open();
150 int n = _cmd.ExecuteNonQuery();
151 _conn.Close();
152
153 if (n > 0)
154 {
155 return true;
156 }
157 else { return false; }
158
159 }
160 }
161 }
数据访问类
1 using System;
2 using System.Collections.Generic;
3 using System.Linq;
4 using System.Text;
5
6 namespace ConsoleApplication1
7 {
8 class Program
9 {
10 static void Main(string[] args)
11 {
12 NationData data = new NationData();
13 while (true)
14 {
15 Console.WriteLine("请输入要对数据进行的操作（1：添加、2：修改、3：删除、4：查询）：");
16 string Operation = Convert.ToString(Console.ReadLine());
17 if (Operation == "1")
18 {
19 #region 添加数据
20 Console.Write("请输入要添加的编号：");
21 string code = Console.ReadLine();
22 Console.Write("请输入要添加的名称：");
23 string name = Console.ReadLine();
24
25 if (data.Add(code, name))
26 {
27 Console.WriteLine("添加成功，请按任意键刷新数据");
28 Console.ReadKey();
29 Console.Clear();
30
31 Console.WriteLine("=============刷新数据==============");
32 List<Nation> listSelect = data.Select();
33 foreach (Nation dataSelect in listSelect)
34 {
35 Console.WriteLine(dataSelect.Code + "\t" + dataSelect.Name);
36 }
37 }
38 else
39 {
40 Console.WriteLine("添加失败");
41 }
42 Console.ReadKey();
43 #endregion
44
45 break;
46 }
47 if (Operation == "2")
48 {
49 #region 修改数据
50 Console.Write("请输入要修改的编号：");
51 String codeUpdate = Console.ReadLine();
52 Console.Write("请输入修改后的名称：");
53 string nameUpdate = Console.ReadLine();
54
55 if (data.Update(codeUpdate, nameUpdate))
56 {
57 Console.WriteLine("修改成功，请按任意键刷新数据");
58 Console.ReadKey();
59 Console.Clear();
60
61 Console.WriteLine("==============刷新数据=============");
62 List<Nation> listSelect = data.Select();
63 foreach (Nation dataSelect in listSelect)
64 {
65 Console.WriteLine(dataSelect.Code + "\t" + dataSelect.Name);
66 }
67 }
68 else { Console.WriteLine("修改失败"); }
69 Console.ReadKey();
70 #endregion
71
72 break;
73 }
74 if (Operation == "3")
75 {
76 #region 删除数据
77 Console.WriteLine("请输入要删除数据的编号：");
78 string codeDelete = Console.ReadLine();
79
80 List<Nation> list = data.Select(codeDelete);
81 Console.WriteLine("这是你要删除的数据：");
82 foreach (Nation data1 in list)
83 {
84 Console.WriteLine(data1.Code + "\t" + data1.Name);
85 }
86 Console.WriteLine("确认删除这条数据么？（Y/N）");
87 string s = Console.ReadLine();
88 if (s == "Y")
89 {
90 if (data.Delete(codeDelete))
91 {
92 Console.WriteLine("删除成功，按任意键刷新数据");
93 Console.ReadKey();
94 Console.Clear();
95
96 Console.WriteLine("=============刷新数据==============");
97 List<Nation> listSelect = data.Select();
98 foreach (Nation dataSelect in listSelect)
99 {
100 Console.WriteLine(dataSelect.Code + "\t" + dataSelect.Name);
101 }
102 }
103 else { Console.WriteLine("删除失败"); }
104 }
105 else { Console.WriteLine("数据保留"); }
106 Console.ReadKey();
107 #endregion
108
109 break;
110 }
111
112 if (Operation == "4")
113 {
114 #region 条件查询数据
115 Console.Write("请输入要查询的编号：");
116 string code = Console.ReadLine();
117 List<Nation> list = data.Select(code);
118 foreach (Nation datass in list)
119 {
120 Console.WriteLine(datass.Code+"\t"+datass.Name);
121 }
122 Console.ReadKey();
123 #endregion
124
125 break;
126 }
127 else { Console.WriteLine("输入有误"); }
128 }
129 }
130 }
131 }
时间： 2024-10-16 01:23:20