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 }
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