如何将 C# 中的文本框值插入 Oracle 数据库

Question

好的，我对这一切都很陌生，正在努力在 Windows 窗体应用程序中插入 TextBox 值（用户输入）并将这些值存储到 Oracle 数据库表中。

C# 代码：

string oradb = "DATA SOURCE = larry.uopnet.plymouth.ac.uk:1521/orcl.fost.plymouth.ac.uk;PERSIST SECURITY INFO = True;USER ID = xxxxxxxxxx;password = xxxxxxxxx";

OracleConnection con = new OracleConnection(oradb);
con.Open();
OracleCommand cmd = new OracleCommand();
cmd.Connection = con;
cmd.CommandText = "Insert into USER.Client VALUES (txtBoxClientName, txtBoxClientCity, txtBoxClientCountry, txtBoxClientNumber, txtBoxClientURL, comboClientStatus)";

int rowsUpdated = cmd.ExecuteNonQuery();
if (rowsUpdated == 0)
    MessageBox.Show("Please fill in required fields");
else
    MessageBox.Show("Client has been added");
con.Dispose();

此错误出现在 int rowsUpdated = cmd.ExecuteNonQuery(); 行 - Oracle.DataAccess.dll 中出现 Oracle.DataAccess.Client.OracleException 类型的未处理异常

Oracle 中的触发代码：

create or replace TRIGGER trg_client_ClientID
BEFORE INSERT ON client FOR EACH ROW
BEGIN
  :NEW.ClientID := seq_client_ClientID.nextval;
END;

Answer 1

在添加 OracleException 和 ArgumentException 以及使用 Elkhan 的 Parameter 代码的帮助下，我设法修复了它 - 这是我修改后的工作代码：

    private void btnClientSave_Click(object sender, EventArgs e)
    {

        string oradb = "DATA SOURCE = larry.uopnet.plymouth.ac.uk:1521/orcl.fost.plymouth.ac.uk;PERSIST SECURITY INFO = True;USER ID = xxxxxxxxx;password = xxxxxxxx";
        string insertquery = "Insert into Client VALUES (:1, :2, :3, :4, :5, :6, :7)";


        OracleConnection con = new OracleConnection(oradb);
        con.Open();
        OracleCommand cmd = new OracleCommand();
        cmd.Connection = con;
        cmd.CommandText = insertquery;
        try
        {

            cmd.Parameters.Add(new OracleParameter("1", OracleDbType.Decimal, ParameterDirection.ReturnValue));
            cmd.Parameters.Add(new OracleParameter("2", OracleDbType.Varchar2, txtBoxClientName.Text, ParameterDirection.Input));
            cmd.Parameters.Add(new OracleParameter("3", OracleDbType.Varchar2, txtBoxClientCity.Text, ParameterDirection.Input));
            cmd.Parameters.Add(new OracleParameter("4", OracleDbType.Varchar2, txtBoxClientCountry.Text, ParameterDirection.Input));
            cmd.Parameters.Add(new OracleParameter("5", OracleDbType.Varchar2, txtBoxClientNumber.Text, ParameterDirection.Input));
            cmd.Parameters.Add(new OracleParameter("6", OracleDbType.Varchar2, txtBoxClientURL.Text, ParameterDirection.Input));
            cmd.Parameters.Add(new OracleParameter("7", OracleDbType.Varchar2, comboClientStatus.Text, ParameterDirection.Input));

            cmd.ExecuteNonQuery();

            MessageBox.Show("Client has been added");
            con.Close();
            Close();
        }
        catch (OracleException e1)
        {
            MessageBox.Show("Error: " + e1.Message);
        }
        catch (ArgumentException e2)
        {
            MessageBox.Show("Error: " + e2.Message);
        }
        finally
        {                
            cmd.Dispose();
            con.Dispose();
        }

Answer 2

像这样：

    cmd.CommandText = "Insert into USER.Client VALUES (:param_txtBoxClientName, :param_txtBoxClientCity, :param_txtBoxClientCountry, :param_txtBoxClientNumber, :param_txtBoxClientURL, :param_comboClientStatus)";

    cmd.Parameters.Add(new OracleParameter("param_txtBoxClientName", OracleDbType.Varchar2, txtBoxClientName.Text, ParameterDirection.Input));
    cmd.Parameters.Add(new OracleParameter("param_txtBoxClientCity", OracleDbType.Varchar2, txtBoxClientCity.Text, ParameterDirection.Input));
    cmd.Parameters.Add(new OracleParameter("param_txtBoxClientNumber", OracleDbType.Varchar2, txtBoxClientNumber.Text, ParameterDirection.Input));
    cmd.Parameters.Add(new OracleParameter("param_txtBoxClientURL", OracleDbType.Varchar2, txtBoxClientURL.Text, ParameterDirection.Input));