ado.not--更改精简练习

Posted 2020-07-31 右掱写爱

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 using System.Data.SqlClient;
 7 
 8 namespace _06_22
 9 {
10     class Program
11     {
12         static void Main(string[] args)
13         {
14 
15             //练习题： 
16 
17             #region  显示全部
18             //1、Car表数据查出显示
19             SqlConnection coon = new SqlConnection("server=.;database=Data0425;user=sa;pwd=123;");
20             SqlCommand com = coon.CreateCommand();
21 
22             com.CommandText = "select * from car";
23             coon.Open();
24             SqlDataReader a1 = com.ExecuteReader();
25             if (a1.HasRows)
26             {
27                 while (a1.Read())
28                 {
29                     Console.WriteLine("编号：" + a1["Code"] + " 品牌：" + a1["name"] + " 油耗：" + a1["oil"] + " 马力：" + a1["powers"] + " 排量：" + a1["exhaust"] + " 价格:" + a1["price"]);
30                 }
31             }
32 
33             coon.Close();
34             #endregion
35 
36             //2、请输入要查的汽车名称：
37             //    请输入要查的汽车油耗：
38             //    请输入要查的汽车马力：
39             //名称：宝马
40             //油耗：8
41             //马力：1
42 
43 
44 
45             for (; ; )
46             {
47                 Console.Write("请输入要查的汽车名称：");
48                 string cname = Console.ReadLine();
49                 Console.Write("请输入要查的汽车油耗：");
50                 string coil = Console.ReadLine();
51                 Console.Write(" 请输入要查的汽车马力：");
52                 string cpowers = Console.ReadLine();        //输入查询内容
53 
54 
55                     com.CommandText = "select * from car where name like @cname and oil like @coil and powers like @cpowers ";
56 
57                     com.Parameters.Clear();
58                     com.Parameters.Add("@cname", "%" + cname + "%");
59                     com.Parameters.Add("@coil", "%" + coil + "%");
60                     com.Parameters.Add("@cpowers", "%" + cpowers + "%");
61 
62                     coon.Open();
63                     SqlDataReader c1 = com.ExecuteReader();
64                     if (c1.HasRows)
65                     {
66                         while (c1.Read())
67                         {
68                             Console.WriteLine("编号：" + c1["Code"] + " 品牌：" + c1["name"] + " 油耗：" + c1["oil"] + " 马力：" + c1["powers"] + " 排量：" + c1["exhaust"] + " 价格:" + c1["price"]);
69                         }
70                         Console.Write("是否结束？[y/n]");
71                         string js = Console.ReadLine();
72                         if (js == "y")
73                         { break; }
74                     }
75                     else
76                     { Console.WriteLine("查无此项！！！重新输入！！"); }
77                     coon.Close();
78          
79 
80 
81 
82 
83             }
84             Console.ReadLine();
85         }
86     }
87 }