Question

我编写了具有id，年份和状态的代码。状态是一个梳子盒，它有4个项目，当我尝试运行这个代码时，它一直告诉我由于UPDATE语句中的Syntax错误而失败，你能给我一些想法吗？

private void button3_Click(object sender, EventArgs e)
{
    try
    {
        conn.ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;" +
            @"Data source= C:\crt_db.accdb";

        conn.Open();
        String year = dateTimePicker1.Text.ToString();
        String status = comboBox2.Text.ToString();
        String z =EPID.Text.ToString();

        String my_querry = "update crtRenewald set Year='" + year + "',Status='" + status+ "' where EPID=" + z + "";                
        OleDbCommand cmd1 = new OleDbCommand(my_querry, conn);
        cmd1.ExecuteNonQuery();

        MessageBox.Show("Status updated");
    }
    catch (Exception ex)
    {
        MessageBox.Show("Failed due to" + ex.Message);
    }
    finally
    {
        conn.Close();
    }

Answer 1

我认为UPDATE查询字符串中的引号不正确。尝试将其更改为：

String my_querry = "update crtRenewald set Year='" + year + "',Status='" + status + "' where EPID='" + z + "'";

Answer 2

试试这段代码，对您有所帮助： -

我根据你的sql syntex使用参数化查询。

     conn.ConnectionString = @"Provider=Microsoft.ACE.OLEDB.12.0;" +@"Data source= C:\crt_db.accdb";

     conn.Open();

    using (OleDbCommand cmd = conn.CreateCommand())
    {
        OleDbCommand scmd = new OleDbCommand("UPDATE crtRenewald SET Year=@Year, Status=@Status where @EPID=EPID", conn);
        scmd.Parameters.AddWithValue("Year", dateTimePicker1.Text.ToString());
        scmd.Parameters.AddWithValue("Status", comboBox2.Text.ToString());
        scmd.Parameters.AddWithValue("EPID", EPID.Text.ToString());

        scmd.ExecuteNonQuery();
     }

     conn.Close();

我的c＃更新代码出了什么问题？

2 个答案: