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我有两个数据表 Table_1 和 Table_2。我的代码有什么问题？我不能在 Table_2 中添加 Table_1 的库存总和？

当我更新一次时，我有一个正确的输出。

http://tinypic.com/view.php?pic=1632bs&s=5

当我再次按下更新按钮时，它只更新第一行，如下图所示：

http://tinypic.com/r/350p6hd/5

private void txtid_TextChanged(object sender, EventArgs e)
    {
        SqlConnection csq = new SqlConnection("workstation id=;initial catalog=iridadb; integrated security=SSPI");

        SqlDataAdapter dsaq = new SqlDataAdapter();
        DataSet dsq = new DataSet();

        dsaq.SelectCommand = new SqlCommand("Select * from Table_1 where left(id, " + txtid.Text.Length + ") = '" + txtid.Text + "' order by ItemID ASC", csq);
        dsq.Clear();

        dsaq.Fill(dsq);

        dataGridView1.DataSource = dsq.Tables[0];
        dataGridView1.AllowUserToAddRows = false;

        bindDataGridView2();
    }

    public void bindDataGridView2()
    {

        SqlConnection csq = new SqlConnection("workstation id=;initial catalog=iridadb; integrated security=SSPI");

        SqlDataAdapter dsaq = new SqlDataAdapter();
        DataSet dsq = new DataSet();

        dsaq.SelectCommand = new SqlCommand("Select * from Table_2 ", csq);
        dsq.Clear();

        dsaq.Fill(dsq);

        dataGridView2.DataSource = dsq.Tables[0];
        dataGridView2.AllowUserToAddRows = false;

    }

    private void btnUpdate_Click(object sender, EventArgs e)
    {
        for (int i = 0; i <= dataGridView1.Rows.Count - 1; i++)
        {
            if (!dataGridView1.Rows[i].IsNewRow)
            {


                SqlConnection connan = new SqlConnection("DATA SOURCE=;initial catalog=iridadb; integrated security=SSPI");
                SqlDataAdapter danan = new SqlDataAdapter();
                danan.UpdateCommand = new SqlCommand("UPDATE  Table_2 SET Stock  = @Stock  WHERE itemID = @itemID", connan);
                danan.UpdateCommand.Parameters.Add("@itemID", SqlDbType.VarChar).Value = Convert.ToString(dataGridView1.Rows[i].Cells[1].Value).ToString();

                danan.UpdateCommand.Parameters.Add("@Stock", SqlDbType.VarChar).Value = (Double.Parse(dataGridView1.Rows[i].Cells[2].Value.ToString()) + Double.Parse(dataGridView2.Rows[i].Cells[1].Value.ToString())).ToString();



                connan.Open();
                danan.UpdateCommand.ExecuteNonQuery();
                connan.Close();

                bindDataGridView2();


            }
        }
    }
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1 回答 1

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检查总和的计算：

(Double.Parse(dataGridView1.Rows[i].Cells[2].Value.ToString()) + Double.Parse(dataGridView2.Rows[i].Cells[1].Value.ToString())).ToString();

您计算具有相同rowindex但按 itemID 更新数据库的行总和

在循环索引时，i = 2它会计算 Stock(where itemID = 03) + Stock(where itemID = 02) -> 作为第 02 项的 Stock 不更新它始终保持在 100。这就是为什么第 03 项股票将始终为 100 + 1

因为数据库中已经有总库存，所以使用这样的查询

UPDATE  Table_2 SET 
Stock = CAST(
        CAST(Stock AS DECIMAL(19,4)) + CAST(@Stock AS DECIMAL(19,4)) 
        AS VARCHAR(MAX)) 
WHERE itemID = @itemID"

并仅从datagridview1

danan.UpdateCommand.Parameters.Add("@itemID", SqlDbType.VarChar).Value = Convert.ToString(dataGridView1.Rows[i].Cells[1].Value).ToString();

// 
danan.UpdateCommand.Parameters.Add("@Stock", SqlDbType.VarChar).Value = (Double.Parse(dataGridView1.Rows[i].Cells[2].Value.ToString())

PS 抱歉，但当您将Double/的值存储Decimal为VARCHAR... 时，看起来真的很奇怪？

于 2013-08-24T05:12:30.317 回答