Question

我使用相同的按钮＆＃34; Save＆＃34;更新名为AnalysisExperiments的表，并将数据插入名为＆＃34; Analysis＆＃34;的表中。但更新无效。这是代码：

 #region Insert Data into Analysis Table
        if (checkIfRepeatedJobNumber(tbJobNumber.Text.Trim()))
        {
            MessageBox.Show("Job Number is already exist.", "Repeated Data");
            return;
        }

        string query = "insert into Analysis (ID, WellName, EstimatedStartDate, SOWComments, ProgressComments, Field, FocalPoint, StudyCompleted, Company, ReservoirPressure, ReservoirTemp, SelectedSamples) " +
            "values (@ID, @WellName, @SamplingDate, @SOWComments, @ProgressComments, @Field, @FocalPoint, @StudyCompleted, @Company, @ReservoirPressure, @ReservoirTemp, @SelectedSamples)";
        OleDbCommand cmd = new OleDbCommand(query, conn);
        cmd.Parameters.AddWithValue("@ID", tbJobNumber.Text);
        cmd.Parameters.AddWithValue("@WellName", tbWellName.Text);
        cmd.Parameters.AddWithValue("@SamplingDate", dtpSamplingDate.Text);
        cmd.Parameters.AddWithValue("@SOWComments", tbSOW_Comments.Text);
        cmd.Parameters.AddWithValue("@ProgressComments", tbProgressComments.Text);
        cmd.Parameters.AddWithValue("@Field", tbFieldName.Text);
        cmd.Parameters.AddWithValue("@FocalPoint", tbFocalName.Text);
        if (radYes.Checked)
            cmd.Parameters.AddWithValue("@StudyCompleted", "Yes");
        else
            cmd.Parameters.AddWithValue("@StudyCompleted", "No");

        cmd.Parameters.AddWithValue("@Company", tbCompany.Text);
        cmd.Parameters.AddWithValue("@ReservoirPressure", tbReservoirPressure.Text);
        cmd.Parameters.AddWithValue("@ReservoirTemp", tbReservoirTemp.Text);
        cmd.Parameters.AddWithValue("@@SelectedSamples", tbSelectedSamples.Text);


        try
        {
            conn.Open();
            int j = cmd.ExecuteNonQuery();
            if (j == 1)
            {
                MessageBox.Show("Done");
                this.Close();
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
        finally
        {
            conn.Close();
        }
        #endregion

        #region update analysis Exp but still no working

        #region Update database
        try
        { int k = 0;
            OleDbDataAdapter da;
            da = new OleDbDataAdapter("select* from [AnalysisExperiments]", conn);
            string ExpQuery = "update AnalysisExperiments set SampleNumber = @SampleNumber, Status = @Status where ID = '" + tbJobNumber.Text + "' and Experiment = '";

            foreach (DataGridViewRow row in dgvExperiments.Rows)
            {
                ExpQuery += row.Cells["Experiment"].Value.ToString() + "'";
                OleDbCommand updateCommand = new OleDbCommand(ExpQuery, conn);
                updateCommand.Parameters.Add("@SampleNumber", OleDbType.VarWChar);
                MessageBox.Show(row.Cells["SampleNumber"].Value.ToString() + " | " + row.Cells["Status"].Value.ToString() + " | " + row.Cells["Experiment"].Value.ToString());
                updateCommand.Parameters["@SampleNumber"].Value = row.Cells["SampleNumber"].Value.ToString();
                updateCommand.Parameters.Add("@Status", OleDbType.Boolean);
                updateCommand.Parameters["@Status"].Value = row.Cells["Status"].Value;
                da.UpdateCommand = updateCommand;

                conn.Open();
                k = da.UpdateCommand.ExecuteNonQuery();
                conn.Close();
            }

            if (k == 1)
                MessageBox.Show("Done");
            else
            {
                MessageBox.Show("Nothing Updated!");
            }
        }
        catch(Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
        #endregion

        #endregion

知道编译器跳过更新区域中的循环。

Answer 1

在第二个循环中，查询语法变为无效，因为+ =将前一个文本与新文本连接

Dim newQuery = ExQuery + row.Cells["Experiment"].Value.ToString() + "'";

然后将新字符串用于ExecuteNonQuery。

这种方法仍有许多问题。您应该使用不同的方法分隔此代码，并将参数也用于最后一个值

Answer 2

您是否尝试调试foreach行以查看 dgvExperiments 中是否有任何行，以及它们的类型（或子类型） DataGridViewRow ？

使用一个按钮插入和更新不同的数据库表

2 个答案: