题目：
一、数据显示：
二、功能操作：
“请输入您要继续的操作（输入数字1为新增，输入数字2为修改，输入数字3为删除）：”，输入其它内容提示输入有误，并回到上面继续等待用户操作。
三、新增：
当用户输入1并回车后，按照顺序让用户分别输入：学生编号，学生姓名，性别，生日，专业等内容。
每次输入都需要做以下判断，如果输入不正确，则提示输入有误，并让用户重新输入，当每一项输入正确后才可以继续下一项的输入；
1、学生编号不允许重复
2、学生姓名不能为空
3、性别只能输入男/女，并自动转换为true/false
4、生日格式是否是正确
5、专业需要用户输入中文，如：当用户输入“商务英语”或“英语”，自动查到“Z001”专业编号，如果查不到则提示“没有此专业，请重新输入。”
当以上内容全部填写完毕并无误后，将此学生信息打印显示出来，并询问用户“以上为新增学生的信息，是否确定添加？（Y/N）：”，当用户输入Y确定添加后，才进行添加，如果添加成功，则将控制台程序清空，并刷新显示最新的Student表数据，在底部提示”添加成功”，并继续回到“第2步”等待用户继续操作。
四、修改：
当用户输入2并回车时，提示用户输入需要更改的学生编号，如果有此学生，那么除学生编号外，其余的内容全部进行修改。
已查询到的学生信息，请进行以下修改：
每次修改后都需要与新增时一样的判断，当全部内容都修改完毕后，将修改后的学生信息打印显示出来，并询问“以上为修改后的学生信息，是否确定修改？（Y/N）：”，当用户输入Y并回车才真正确定修改，并提示修改是否成功，如果修改成功，则清空控制台内容，刷新显示最新的Student表数据，并提示修改成功，继续回到“二”等待用户继续操作。
五、删除：
当用户输入3并回车时，提示用户输入需要删除的学生编号，如果有此学生，那么将此学生的信息展示出来，并提示“是否要删除此学生的信息？（Y/N)”，当用户输入Y确定删除后，才进行删除，并提示删除是否成功，如果删除成功，则清空控制台内容，刷新显示最新的Student表数据，并提示删除成功，继续回到“二”等待用户继续操作。
答案：
1.建表
1 create database ADOkaoshi 2 go 3 use ADOkaoshi 4 go 5 create table Student 6 ( 7 Code nvarchar(50) primary key not null, 8 Name nvarchar(50) not null, 9 Sex bit not null, 10 Birthday datetime not null, 11 SubjectCode nvarchar(50) 12 ) 13 create table Ssubject 14 ( 15 SubjectCode nvarchar(50) primary key not null, 16 SubjectName nvarchar(50) not null 17 ) 18 insert into Ssubject values(‘Z001‘,‘商务英语‘) 19 insert into Ssubject values(‘Z002‘,‘软件工程‘) 20 insert into Ssubject values(‘Z003‘,‘旅游‘) 21 insert into Ssubject values(‘Z004‘,‘工商管理‘) 22 go 23 insert into Student values(‘S001‘,‘张三‘,1,‘1994-1-12‘,‘Z001‘) 24 insert into Student values(‘S002‘,‘李四‘,1,‘1995-2-22‘,‘Z002‘) 25 insert into Student values(‘S003‘,‘王五‘,1,‘1996-8-28‘,‘Z002‘) 26 insert into Student values(‘S004‘,‘小花‘,0,‘1997-3-6‘,‘Z003‘) 27 go 28 select * from Ssubject 29 select * from Student 30
2.建立数据模型
1 public class student
2 {
3 private string _Code;
4
5 public string Code
6 {
7 get { return _Code; }
8 set { _Code = value; }
9 }
10 private string _Name;
11
12 public string Name
13 {
14 get { return _Name; }
15 set { _Name = value; }
16 }
17 private bool _Sex;
18
19 public bool Sex
20 {
21 get { return _Sex; }
22 set { _Sex = value; }
23 }
24 private DateTime _Birthday;
25
26 public DateTime Birthday
27 {
28 get { return _Birthday; }
29 set { _Birthday = value; }
30 }
31 private string _SubjectCode;
32
33 public string SubjectCode
34 {
35 get { return _SubjectCode; }
36 set { _SubjectCode = value; }
37 }
38
39 public string Subjectname
40 {
41 get
42 {
43 string sub = "";
44 SqlConnection conn = new SqlConnection("server=.;database=ADOkaoshi;user=sa;pwd=123;");
45 SqlCommand com = conn.CreateCommand();
46 com.CommandText = "select * from Ssubject where SubjectCode = @Subjectcode";
47 com.Parameters.Clear();
48 com.Parameters.Add("@Subjectcode",_SubjectCode);
49 conn.Open();
50 SqlDataReader data = com.ExecuteReader();
51 if(data.HasRows)
52 {
53 data.Read();
54 sub = data["SubjectName"].ToString();
55 }
56 conn.Close();
57 return sub;
58 }
59 }
60 }
3.写数据访问方法
1 public class studentway
2 {
3 SqlConnection conn = null;
4 SqlCommand com = null;
5 public studentway()
6 {
7 conn = new SqlConnection("server=.;database=ADOkaoshi;user=sa;pwd=123;");
8 com = conn.CreateCommand();
9 }
10 /// <summary>
11 /// 查询表
12 /// </summary>
13 /// <returns></returns>
14 public List<student> chaxun()
15 {
16 List<student> list = new List<student>();
17 com.CommandText = "select * from Student";
18 conn.Open();
19 SqlDataReader data = com.ExecuteReader();
20 if (data.HasRows)
21 {
22 while (data.Read())
23 {
24 student stu = new student();
25 stu.Code = data["Code"].ToString();
26 stu.Name = data["Name"].ToString();
27 stu.Sex = Convert.ToBoolean(data["Sex"]);
28 stu.Birthday = Convert.ToDateTime(data["Birthday"]);
29 stu.SubjectCode = data["SubjectCode"].ToString();
30 list.Add(stu);
31 }
32 }
33 conn.Close();
34 return list;
35 }
36 /// <summary>
37 /// 查询
38 /// </summary>
39 /// <returns></returns>
40 public List<student> chaxun1(string code)
41 {
42 List<student> list = new List<student>();
43 com.CommandText = "select * from Student where Code = @code";
44 com.Parameters.Clear();
45 com.Parameters.Add("@code",code);
46 conn.Open();
47 SqlDataReader data = com.ExecuteReader();
48 if (data.HasRows)
49 {
50 while (data.Read())
51 {
52 student stu = new student();
53 stu.Code = data["Code"].ToString();
54 stu.Name = data["Name"].ToString();
55 stu.Sex = Convert.ToBoolean(data["Sex"]);
56 stu.Birthday = Convert.ToDateTime(data["Birthday"]);
57 stu.SubjectCode = data["SubjectCode"].ToString();
58 list.Add(stu);
59 }
60 }
61 conn.Close();
62 return list;
63 }
64 /// <summary>
65 /// 修改
66 /// </summary>
67 /// <param name="code">编号</param>
68 /// <param name="name">名字</param>
69 /// <param name="sex">性别</param>
70 /// <param name="birthday">生日</param>
71 /// <param name="subjectcode">课程号</param>
72 public void xiugai(string code, string name, bool sex, DateTime birthday, string subjectcode)
73 {
74 com.CommandText = "update student set Name = @Name,Sex = @Sex,Birthday = @Birthday,SubjectCode = @SubjectCode where Code = @Code";
75 com.Parameters.Clear();
76 com.Parameters.Add("@Code", code);
77 com.Parameters.Add("@Name", name);
78 com.Parameters.Add("@Sex", sex);
79 com.Parameters.Add("@Birthday", birthday);
80 com.Parameters.Add("@SubjectCode", subjectcode);
81 conn.Open();
82 com.ExecuteNonQuery();
83 conn.Close();
84 }
85 /// <summary>
86 /// 添加
87 /// </summary>
88 /// <param name="code">学号</param>
89 /// <param name="name">名字</param>
90 /// <param name="sex">性别</param>
91 /// <param name="birthday">生日</param>
92 /// <param name="subjectcode">课程号</param>
93 public void tianjia(string code, string name, bool sex, DateTime birthday, string subjectcode)
94 {
95 com.CommandText = "insert into Student values(@Code,@Name,@Sex,@Birthday,@SubjectCode)";
96 com.Parameters.Clear();
97 com.Parameters.Add("@Code", code);
98 com.Parameters.Add("@Name", name);
99 com.Parameters.Add("@Sex", sex);
100 com.Parameters.Add("@Birthday", birthday);
101 com.Parameters.Add("@SubjectCode", subjectcode);
102 conn.Open();
103 com.ExecuteNonQuery();
104 conn.Close();
105 }
106 /// <summary>
107 /// 删除
108 /// </summary>
109 /// <param name="code">学号</param>
110 public void shanchu(string code)
111 {
112 com.CommandText = "delete from Student where Code = @Code";
113 com.Parameters.Clear();
114 com.Parameters.Add("@Code", code);
115 conn.Open();
116 com.ExecuteNonQuery();
117 conn.Close();
118 }
119 }
4.打印的方法
1 class dayin
2 {
3 /// <summary>
4 /// 打印全部
5 /// </summary>
6 public void dayin1()
7 {
8 List<student> list = new studentway().chaxun();
9 Console.WriteLine("编号" + " " + "姓名" + " " + "性别" + " " + "年龄" + " " + "生日" + " " + "专业");
10 foreach (student a in list)
11 {
12 string sex = (a.Sex) ? "男" : "女";
13 Console.WriteLine(a.Code + " " + a.Name + " " + sex + " " + (DateTime.Now.Year - a.Birthday.Year) + " " + (a.Birthday.ToString("yyyy年MM月dd日")) + " " + a.Subjectname);
14 }
15 }
16 /// <summary>
17 /// 打印用户输入的数据
18 /// </summary>
19 /// <param name="Code"></param>
20 /// <param name="Name"></param>
21 /// <param name="Sex"></param>
22 /// <param name="Birthday"></param>
23 /// <param name="Subjectname"></param>
24 public void dayin2(string Code,string Name,bool Sex,DateTime Birthday,string Subjectname)
25 {
26 Console.WriteLine("编号" + " " + "姓名" + " " + "性别" + " " + "年龄" + " " + "生日" + " " + "专业");
27 string sex = (Sex) ? "男" : "女";
28 Console.WriteLine(Code + " " + Name + " " + sex + " " + (DateTime.Now.Year - Birthday.Year) + " " + (Birthday.ToString("yyyy年MM月dd日")) + " " + Subjectname);
29 }
30 }
31 }
5.定义的变量
1 class shuxing
2 {
3 public string code;
4 public string name;
5 public bool sex;
6 public DateTime birthday;
7 public string subjectname;
8 public string subjectcode;
9 }
6.Main函数中的代码
1 //1.数据显示
2 dayin aa = new dayin();
3 aa.dayin1();
4 //2.用户输入
5 for (; ; )
6 {
7 string shuru = "";
8 for (; ; )
9 {
10 Console.Write("请输入您要继续的操作（输入数字1为新增，输入数字2为修改，输入数字3为删除）:");
11 shuru = Console.ReadLine();
12 if (shuru == "1" || shuru == "2" || shuru == "3")
13 {
14 break;
15 }
16 else
17 {
18 Console.WriteLine("您的输入有误，请重新输入！");
19 }
20 }
21 //3.新增
22 #region
23 if (shuru == "1")
24 {
25 for (; ; )
26 {
27 shuxing bb = new shuxing();
28 for (; ; )
29 {
30 Console.Write("请输入学生编号：");
31 bb.code = Console.ReadLine();
32 List<student> list = new studentway().chaxun1(bb.code);
33 if (list.Count != 0)
34 {
35 Console.WriteLine("该学生已存在，请重新输入！");
36 }
37 else
38 {
39 break;
40 }
41 }
42 for (; ; )
43 {
44 Console.Write("请输入学生姓名：");
45 bb.name = Console.ReadLine();
46 if (bb.name == "")
47 {
48 Console.WriteLine("学生姓名不能为空，请重新输入！");
49 }
50 else
51 {
52 break;
53 }
54 }
55 for (; ; )
56 {
57 Console.Write("请输入学生性别：");
58 string a1 = Console.ReadLine();
59 if (a1 == "男")
60 {
61 bb.sex = true;
62 break;
63 }
64 else if (a1 == "女")
65 {
66 bb.sex = false;
67 break;
68 }
69 else
70 {
71 Console.WriteLine("输入错误请重新输入！");
72 }
73 }
74 for (; ; )
75 {
76 try
77 {
78 Console.Write("请输入学生生日（XXXX-XX-XX）：");
79 bb.birthday = Convert.ToDateTime(Console.ReadLine());
80 break;
81 }
82 catch
83 {
84 Console.WriteLine("输入错误请重新输入！");
85 }
86 }
87 for (; ; )
88 {
89 Console.Write("请输入学生课程名称：");
90 bb.subjectname = Console.ReadLine();
91 SqlConnection conn = new SqlConnection("server=.;database=ADOkaoshi;user=sa;pwd=123;");
92 SqlCommand com = conn.CreateCommand();
93 com.CommandText = "select * from Ssubject where SubjectName like @subject";
94 com.Parameters.Clear();
95 com.Parameters.Add("@subject", "%" + bb.subjectname + "%");
96 conn.Open();
97 SqlDataReader a2 = com.ExecuteReader();
98 if (a2.HasRows)
99 {
100 a2.Read();
101 bb.subjectcode = a2["SubjectCode"].ToString();
102 break;
103 }
104 else
105 {
106 Console.WriteLine("不存在这门课程，请重新输入！");
107 }
108 }
109
110 studentway stuway = new studentway();
111 dayin dayinX = new dayin();
112 dayinX.dayin2(bb.code, bb.name, bb.sex, bb.birthday, bb.subjectname);
113 Console.Write("您是否要添加本条数据（Y/N）：");
114 string panduan = Console.ReadLine();
115 if (panduan == "Y")
116 {
117 stuway.tianjia(bb.code, bb.name, bb.sex, bb.birthday, bb.subjectcode);
118 Console.Clear();
119 dayinX.dayin1();
120 Console.WriteLine("添加成功！");
121 break;
122 }
123 else
124 {
125 Console.WriteLine("请重新输入信息！");
126 }
127
128 }
129 }
130 #endregion
131
132 //4.修改
133 #region
134 else if (shuru == "2")
135 {
136 for (; ; )
137 {
138 shuxing bb = new shuxing();
139 for (; ; )
140 {
141 Console.Write("请输入学生编号：");
142 bb.code = Console.ReadLine();
143 List<student> list = new studentway().chaxun1(bb.code);
144 if (list.Count != 0)
145 {
146 break;
147 }
148 else
149 {
150 Console.WriteLine("该学生不存在，请重新输入！");
151 }
152 }
153 for (; ; )
154 {
155 Console.Write("请输入修改后的学生姓名：");
156 bb.name = Console.ReadLine();
157 if (bb.name == "")
158 {
159 Console.WriteLine("学生姓名不能为空，请重新输入！");
160 }
161 else
162 {
163 break;
164 }
165 }
166 for (; ; )
167 {
168 Console.Write("请输入修改后的学生性别：");
169 string a1 = Console.ReadLine();
170 if (a1 == "男")
171 {
172 bb.sex = true;
173 break;
174 }
175 else if (a1 == "女")
176 {
177 bb.sex = false;
178 break;
179 }
180 else
181 {
182 Console.WriteLine("输入错误请重新输入！");
183 }
184 }
185 for (; ; )
186 {
187 try
188 {
189 Console.Write("请输入修改后的学生生日（XXXX-XX-XX）：");
190 bb.birthday = Convert.ToDateTime(Console.ReadLine());
191 break;
192 }
193 catch
194 {
195 Console.WriteLine("输入错误请重新输入！");
196 }
197 }
198 for (; ; )
199 {
200 Console.Write("请输入修改后的学生课程名称：");
201 bb.subjectname = Console.ReadLine();
202 SqlConnection conn = new SqlConnection("server=.;database=ADOkaoshi;user=sa;pwd=123;");
203 SqlCommand com = conn.CreateCommand();
204 com.CommandText = "select * from Ssubject where SubjectName like @subject";
205 com.Parameters.Clear();
206 com.Parameters.Add("@subject", "%" + bb.subjectname + "%");
207 conn.Open();
208 SqlDataReader a2 = com.ExecuteReader();
209 if (a2.HasRows)
210 {
211 a2.Read();
212 bb.subjectcode = a2["SubjectCode"].ToString();
213 break;
214 }
215 else
216 {
217 Console.WriteLine("不存在这门课程，请重新输入！");
218 }
219 }
220 studentway stuway = new studentway();
221 dayin dayinX = new dayin();
222 dayinX.dayin2(bb.code, bb.name, bb.sex, bb.birthday, bb.subjectname);
223 Console.Write("您是否要修改为本条数据（Y/N）：");
224 string panduan = Console.ReadLine();
225 if (panduan == "Y")
226 {
227 stuway.xiugai(bb.code, bb.name, bb.sex, bb.birthday, bb.subjectcode);
228 Console.Clear();
229 dayinX.dayin1();
230 Console.WriteLine("修改成功！");
231 break;
232 }
233 else
234 {
235 Console.WriteLine("请重新输入信息！");
236 }
237 }
238 }
239 #endregion
240
241 //5.删除
242 #region
243 else if (shuru == "3")
244 {
245 for (; ; )
246 {
247 shuxing bb = new shuxing();
248 for (; ; )
249 {
250 Console.Write("请输入学生编号：");
251 bb.code = Console.ReadLine();
252 List<student> list = new studentway().chaxun1(bb.code);
253 if (list.Count != 0)
254 {
255 break;
256 }
257 else
258 {
259 Console.WriteLine("该学生不存在，请重新输入！");
260 }
261 }
262 studentway stuway = new studentway();
263 dayin dayinX = new dayin();
264 Console.Write("您是否要删除编号为" + bb.code + "的数据（Y/N）：");
265 string panduan = Console.ReadLine();
266 if (panduan == "Y")
267 {
268 stuway.shanchu(bb.code);
269 Console.Clear();
270 dayinX.dayin1();
271 Console.WriteLine("删除成功！");
272 break;
273 }
274 else
275 {
276 Console.WriteLine("请重新输入信息！");
277 }
278 }
279 }
280 #endregion
281 }
时间： 2024-10-12 12:50:44