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第一个ADO.NET连接SQl server数据库

2024-08-01 05:11:41   222人阅读

ado.net连接sql server2008本机数据库

1.只连接数据库，然后做简单查询

1  using (SqlConnection conn = new SqlConnection("Data Source=127.0.0.1; Initial Catalog=MyTest;User ID=sa;Password=123456"))2             {3                 conn.Open();4                 using (SqlCommand cmd = conn.CreateCommand())5                 {6                     long i = (long)cmd.ExecuteScalar();//bigint→long7                     MessageBox.Show(i.ToString());8                 }9             }

 

2.能完成一般的数据库连接，实现增删改查基本功能

 1 using System.Windows.Controls; 2 using System.Windows.Data; 3 using System.Windows.Documents; 4 using System.Windows.Input; 5 using System.Windows.Media; 6 using System.Windows.Media.Imaging; 7 using System.Windows.Navigation; 8 using System.Windows.Shapes; 9 using System.Data.SqlClient;10 11 namespace ADONET基础12 {13     /// <summary>14     /// MainWindow.xaml 的交互逻辑15     /// </summary>16     public partial class MainWindow : Window17     {18         public MainWindow()19         {20             InitializeComponent();21         }22 23         private void button1_Click(object sender, RoutedEventArgs e)24         {25             //IDisposible26             //using(类型 d = new ....)27             //{.....................}28 29             //SqlConnection为建立和数据库连接的对象30             //using (SqlConnection conn = new SqlConnection(31             //    "Data Source=127.0.0.1; Initial Catalog=MyTest;User ID=sa;Password=123456"))32             //{33             //    conn.Open();//打开连接34             //    //通过连接创建一个向数据库发命令（Command）的对象SqlCommand35             //    using (SqlCommand cmd = conn.CreateCommand())36             //    {37             //        //CommandText为要执行的SQL语句38 39             //        cmd.CommandText = "Insert into T_Student(Name,Age) values(‘元芳‘,2100)";40             //        cmd.ExecuteNonQuery();//执行41             //    }                42             //}43 44             //ExecuteNonQuery一般用来执行Update、Delete、Insert语句45 46             using (SqlConnection conn = new SqlConnection("Data Source=127.0.0.1; Initial Catalog=MyTest;User ID=sa;Password=123456"))47             {48                 conn.Open();49                 using (SqlCommand cmd = conn.CreateCommand())50                 {51                     //cmd.CommandText = "select count(*) from T_Student where Age<100";52                     //int i =  (int)cmd.ExecuteScalar();53                     //MessageBox.Show(i+"条数据");54 55                     //cmd.CommandText = "select ‘aaa‘";56                     ////ExecuteScalar一般用来执行有且只有一行一列返回值的SQL语句57                     //string s = (string)cmd.ExecuteScalar();58                     //MessageBox.Show(s);59 60                     //获得自增字段的值61                     //cmd.CommandText = "insert into T_Student(Name,Age) values(‘aaa‘,123) ;select @@identity";62                    // cmd.CommandText = "insert into T_Student(Name,Age) output inserted.Id values(‘aaa‘,123) ";63                     long i = (long)cmd.ExecuteScalar();//bigint→long64                     MessageBox.Show(i.ToString());65                 }66             }67 68             //MessageBox.Show("执行完成");69         }70     }71 }
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第一个ADO.NET连接SQl server数据库


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