Question

刚刚处理的东西最近需要帮助我再次卡在这里....我正在使用datagrid从数据库中检索值，我想使用类似的数据网格更新数据库但不知怎的我有麻烦，任何人都可以指导我怎么做.....我的意思是当执行查询时，如果用户想要更新他/她可以在显示值的数据网格中执行的操作，则检索所选数据....

if (textBox1.Text != ""|| textBox1.Text==null)
        {
            textBox3.Enabled = false;
            dateTimePicker1.Enabled = false;
            dateTimePicker2.Enabled = false;
            String txt = textBox1.Text;
            dataGridView1.DataSource = null;
            dataGridView1.Rows.Clear();
            dataGridView1.Refresh();

            OleDbDataAdapter dAdapter = new OleDbDataAdapter("SELECT * FROM [BDetails] WHERE ([BranchCode] = '" + @txt + "')", connParam);
            OleDbCommandBuilder cBuilder = new OleDbCommandBuilder(dAdapter);


             dataTable = new DataTable();
            DataSet ds = new DataSet();

            dAdapter.Fill(dataTable);

            if (dataTable.Rows.Count > 0)
            {
                for (int i = 0; i < dataTable.Rows.Count; i++)
                {
                    dataGridView1.Rows.Add(dataTable.Rows[i][0], dataTable.Rows[i][1], dataTable.Rows[i][2], dataTable.Rows[i][3], dataTable.Rows[i][4], dataTable.Rows[i][5], dataTable.Rows[i][6], dataTable.Rows[i][7], dataTable.Rows[i][8], dataTable.Rows[i][11], dataTable.Rows[i][12]);

                }

            }// end inner if
            else
            {
                MessageBox.Show("No Record Found");
                textBox3.Enabled = true;
                dateTimePicker1.Enabled = true;
                dateTimePicker2.Enabled = true;
            }// end inner else


        }// end outer if
        else 
        {
            MessageBox.Show("Please Enter Branch Code");
            bookConn.Close();

        }// end outer else

我绝望的家伙帮助我

private void button8_Click（object sender，EventArgs e） { READDATA（）; // SaveData（）;

    }// end function

    void ReadData()
    {
        this.ds = new DataSet();
      //  string connString = "CONNICTION STRING GOES HERE";
        dAdapter = new OleDbDataAdapter("select * from BDetails", connParam);
        this.dAdapter.Fill(this.ds,"[BDetails]");
        this.ds.AcceptChanges();
        //set the table as the datasource for the grid in order to show that data in the grid
        this.dataGridView1.DataSource = ds.DefaultViewManager;
    }// end function

    void SaveData()
    {
        DataSet changes = this.ds.GetChanges();
        if (changes != null)
        {
            //Data has changes. 
            //use update method in the adapter. it should update your datasource
            int updatedRows = this.dAdapter.Update(changes);
            this.ds.AcceptChanges();
        }
    }// end function

Answer 1

Abeer。有很多方法可以处理数据，很多时候，开发人员偏好以这种或那种方式工作。从你的问题，我可以看到使用ADO.NET可能是新的，所以我建议你做一些关于使用.NET中的数据的阅读（DataTables，DataSet，DataGrids，DataAdapters，Data Binding，...等）< / p>

我认为（根据我的简短经验）从数据源读取和写入数据的最简单方法是使用DataAdapter将数据读入数据集，然后将数据集设置为用户的gridview的数据源可以编辑。要回写更改，只需在适配器中使用update方法。这是一个示例代码

DataSet ds;
OleDbDataAdapter dataAdapter;
void ReadData()
    {
        this.ds = new DataSet();
        string connString = "CONNICTION STRING GOES HERE";
        this.dataAdapter = new OleDbDataAdapter("QUERY GOES HERE", connString);
        this.dataAdapter.Fill(this.ds, "TABLE1");
        this.ds.AcceptChanges();
        //set the table as the datasource for the grid in order to show that data in the grid
        this.dataGridView1.DataSource = ds.DefaultViewManager;
    }

    void SaveData()
    {
        DataSet changes = this.ds.GetChanges();
        if (changes != null)
        {
            //Data has changes. 
            //use update method in the adapter. it should update your datasource
            int updatedRows = this.dataAdapter.Update(changes);
            this.ds.AcceptChanges();
        }
    }

请参阅以下内容，因为它提供了有关使用DataGrid控件的更长样本

http://www.codeproject.com/Articles/9986/Using-the-DataGrid-Control

有关DataTable，DataSet和DataGrids的一些介绍，请参阅

http://www.codeproject.com/Articles/6179/A-Practical-Guide-to-NET-DataTables-DataSets-and-D

在C＃中使用Datagrid更新数据库

1 个答案: