如何知道sql Update语句是成功执行还是失败？

Question

如何知道sql Update语句是成功执行还是失败？

我使用sql server 2005和C#asp.net.

我是否可以在C#中获取成功或失败的信息,而无需在旧的sql语句中添加一些sql代码？

Answer 1

您可以使用@@ ROWCOUNT来获取上次查询所影响的行数.例如,这可用于确定您的WHERE子句是否实际匹配某些内容.

UPDATE mytable SET
  field = 'SomeValue'
WHERE
  id = 1234

IF @@ROWCOUNT = 0
BEGIN
   --  No row with id=1234
END

Answer 2

您可以使用ExecuteNonQuery的返回值来检查更新是否成功.

SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString);
        SqlCommand cmd = new SqlCommand("sp_updateData", con);
        cmd.CommandType = CommandType.StoredProcedure;
        SqlParameter p1 = new SqlParameter("@id", SqlDbType.Int);
        p1.Value = 1;
        p1.Direction = ParameterDirection.Input;

        SqlParameter p2 = new SqlParameter("@name", SqlDbType.VarChar,50);
        p2.Value = "sls";
        p2.Direction = ParameterDirection.Input;

        cmd.Parameters.Add(p1);
        cmd.Parameters.Add(p2);

        try
        {
            con.Open();
            //count will be the number of rows updated. will be zero if no rows updated.
            int count = cmd.ExecuteNonQuery();
            if (count > 0)
            {
                Console.WriteLine("Update Success!!!");
            }
            else
            {
                Console.WriteLine("No Updates!!!");
            }
            Console.ReadLine();

        }
        catch (SqlException ex)
        {
            Console.WriteLine("Update Failed coz.. " + ex.Message);
        }
        finally
        {
            con.Close();
        }