SqlDataAdapter.Update或SqlCommandBuilder不工作

Question

我有一个带有datagrid的表单，其中填充了来自sqlserver数据库的数据。数据网格可以很好地填充，但我在将用户所做的更改发送回sql数据库中的表时遇到了问题。我的表单代码如下：

public partial class frmTimesheet : Form
{
    private DataTable tableTS = new DataTable();
    private SqlDataAdapter adapter = new SqlDataAdapter();
    private int currentTSID = 0;

    public frmTimesheet()
    {
        InitializeComponent();
    }

    private void frmTimesheet_Load(object sender, EventArgs e)
    {
        string strUser = cUser.currentUser;            
        cMyDate cD = new cMyDate(DateTime.Now.ToString());
        DateTime date = cD.GetDate();
        txtDate.Text = date.ToString();
        cboTSUser.DataSource = cUser.GetListOfUsers("active");
        cboTSUser.DisplayMember = "UserID";
        cboTSUser.Text = strUser;
        CheckForTimeSheet();
        PopulateTimeSheet();
    }

    private void CheckForTimeSheet()
    {
        string strUser = cboTSUser.Text;
        cMyDate cD = new cMyDate(txtDate.Text);
        DateTime date = cD.GetDate();
        int newTSID = cTimesheet.TimeSheetExists(strUser, date);
        if (newTSID != this.currentTSID)
        {
            tableTS.Clear();
            if (newTSID == 0)
            {
                MessageBox.Show("Create TimeSheet");
            }
            else
            {
                this.currentTSID = newTSID;
            }
        }
    }

    private void PopulateTimeSheet()
    {
        try
        {
            string sqlText = "SELECT EntryID, CaseNo, ChargeCode, StartTime, FinishTime, Units " +
                             "FROM tblTimesheetEntries " +
                             "WHERE TSID = " + this.currentTSID + ";";
            SqlConnection linkToDB = new SqlConnection(cConnectionString.BuildConnectionString());
            SqlCommand sqlCom = new SqlCommand(sqlText, linkToDB);
            SqlDataAdapter adapter = new SqlDataAdapter(sqlCom);
            adapter.SelectCommand = sqlCom;
            SqlCommandBuilder builder = new SqlCommandBuilder(adapter);
            adapter.Fill(tableTS);
            dataTimesheet.DataSource = tableTS;                
        }
        catch (Exception eX)
        {
            string eM = "Error Populating Timesheet";
            cError err = new cError(eX, eM);
            MessageBox.Show(eM + Environment.NewLine + eX.Message);
        }         
    }

    private void txtDate_Leave(object sender, EventArgs e)
    {
        CheckForTimeSheet();
        PopulateTimeSheet();            
    }

    private void cboTSUser_DropDownClosed(object sender, EventArgs e)
    {
        CheckForTimeSheet(); 
        PopulateTimeSheet();
    }

    private void dataTimesheet_CellValueChanged(object sender, DataGridViewCellEventArgs e)
    {
        try
        {   
            adapter.Update(tableTS);
        }
        catch (Exception eX)
        {
            string eM = "Error on frmTimesheet, dataTimesheet_CellValueChanged";
            cError err = new cError(eX, eM);
            MessageBox.Show(eM + Environment.NewLine + eX.Message);
        }
    }
}

没有发生异常，当我逐步执行时，问题似乎出在SqlCommandBuilder上，它没有基于给定的SELECT命令构建插入/更新/删除命令。

有没有人看到我做错了什么？

我遗漏了什么？

Answer 1

您需要在更新时设置UpdateCommand而不是SelectCommand：

 SqlDataAdapter adapter = new SqlDataAdapter();
 SqlCommandBuilder sqlBld = new SqlCommandBuilder(adapter)
 adapter.UpdateCommand = sqlBld.GetUpdateCommand() ;

Answer 2

Anurag Ranjhan这个问题很旧，但@Ranjhan提供的答案需要更正。

你不需要写这行：

   adapter.UpdateCommand = sqlBld.GetUpdateCommand() ;

足以写下：

   SqlDataAdapter adapter = new SqlDataAdapter();
   SqlCommandBuilder sqlBld = new SqlCommandBuilder(adapter)
   //remove the next line
   //adapter.UpdateCommand = sqlBld.GetUpdateCommand() ;

Sql update/insert/delete命令基于此行自动生成

 SqlCommandBuilder sqlBld = new SqlCommandBuilder(adapter)

您可以通过执行以下行来查找生成的更新sql：

 sqlBld.GetUpdateCommand().CommandText;

请参阅示例How To Update a SQL Server Database by Using the SqlDataAdapter Object in Visual C# .NET

OP所说的问题可以通过在SQl Server Profiler中查看客户端发送的Sql语句来检查。