Ado.Net基础拾遗二：插入，更新，删除数据

插入数据

 1         public void InsertDataToSQL()

 2         {

 3             string conStr = ConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString;

 4             SqlConnection conn = new SqlConnection(conStr);

 5             conn.Open();

 6 

 7             SqlCommand cmd = new SqlCommand();

 8             cmd.Connection = conn;

 9             cmd.CommandText = "INSERT INTO CUSTOMERS(CustomerID,CompanyName,ContactName) Value('bille','XYZ COMMPANY','Bill Evjen')";

10 

11             //插入操作是通过  cmd.ExecuteNonQuery(); 方法实现的

12             cmd.ExecuteNonQuery();

13             conn.Close();

14         }

更新数据

 1         public int UpdateDataToSQL()

 2         {

 3             string conStr = ConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString;

 4             SqlConnection conn = new SqlConnection(conStr);

 5             conn.Open();

 6 

 7             SqlCommand cmd = new SqlCommand();

 8             cmd.Connection = conn;

 9             cmd.CommandText = "UPDATE Employees SET emp_bonus =1000 WHERE yrs_duty >=5";

10 

11             //cmd.ExecuteNonQuery() 返回更新受影响的记录数

12             int RecordsAffected = cmd.ExecuteNonQuery();

13             return RecordsAffected;

14         }

删除数据

 1         public int DeleteEmployee()

 2         {

 3             string conStr = ConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString;

 4             SqlConnection conn = new SqlConnection(conStr);

 5             conn.Open();

 6 

 7             SqlCommand cmd = new SqlCommand();

 8             cmd.Connection = conn;

 9             cmd.CommandText = "DELETE Employees WHERE LastName = 'Evjen'";

10                

11             //返回删除的记录数

12             int RecordsAffected = cmd.ExecuteNonQuery();

13             return RecordsAffected;

14         }