C# SqlDataAdapter.Update或SqlCommandBuilder不工作
我有一个带有datagrid的表单,它由sqlserver数据库中的数据填充。datagrid填充得很好,但是我很难将用户所做的更改发回sql数据库中的表。我的表格编号如下:C# SqlDataAdapter.Update或SqlCommandBuilder不工作,c#,sql-server,winforms,datagrid,sqldataadapter,C#,Sql Server,Winforms,Datagrid,Sqldataadapter,我有一个带有datagrid的表单,它由sqlserver数据库中的数据填充。datagrid填充得很好,但是我很难将用户所做的更改发回sql数据库中的表。我的表格编号如下: public partial class frmTimesheet : Form { private DataTable tableTS = new DataTable(); private SqlDataAdapter adapter = new SqlDataAdapter(); private
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);
}
}
}
没有异常发生,当我逐步解决这个问题时,似乎是SqlCommandBuilder没有基于gien SELECT命令生成INSERT/UPDATE/DELETE命令
有人能看出我做错了什么吗
我缺少什么?您需要在更新时设置而不是选择命令
:
SqlDataAdapter adapter = new SqlDataAdapter();
SqlCommandBuilder sqlBld = new SqlCommandBuilder(adapter)
adapter.UpdateCommand = sqlBld.GetUpdateCommand() ;
这个问题很老,但提供的答案by@AnuragRanjhan需要纠正。 您不需要写这行:
adapter.UpdateCommand = sqlBld.GetUpdateCommand() ;
足够写下:
SqlDataAdapter adapter = new SqlDataAdapter();
SqlCommandBuilder sqlBld = new SqlCommandBuilder(adapter)
//remove the next line
//adapter.UpdateCommand = sqlBld.GetUpdateCommand() ;
Sql更新/插入/删除命令是基于此行自动生成的
SqlCommandBuilder sqlBld = new SqlCommandBuilder(adapter)
您可以通过执行以下行找到生成的更新sql:
sqlBld.GetUpdateCommand().CommandText;
参见示例
OP所说的问题可以通过查看客户端在
Sql Server Profiler
中发送的Sql语句来检查。请查看我的答案好吗?您可以删除第三行adapter.UpdateCommand=sqlBld.GetUpdateCommand()代码>好心的,你能回顾一下我的答案吗。