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TROUBLE UPDATING DataGrid cells back to the database

I'm having trouble updating individual datagrid cells.

Have two tables car_master (columns include Car_ID, YEAR,VEHICLE) and
car_detail (columns include Car_ID,PRICE,MI LEAGE,and BODY);both tables have a
FK relationship on CAR_ID

so the oracledataadapt er1 select statement(Comma ndText) is:

select car_master.car_ id,
car_master.year ,car_master.veh icle,car_detail .car_id AS EXPR1,
car_detail.pric e,car_detail.mi leage,car_detai l.body,car_deta il.body FROM
car_master,car_ detail where car_master.car_ id=car_detail.c ar_id;
*************** **
the Foreign Key relationship I used:
alter table car_detail add constraint detailFK(CAR_ID ) references
car_master(CAR_ ID);

*************** *************
The c# DataGrid updatecommand code:

TextBox tb;

string key = dgDTMgmt.DataKe ys[e.Item.ItemInde x].ToString();
//Year column
tb = (TextBox)e.Item .Cells[1].Controls[0];
string stYr = tb.Text.Trim(). ToString();
int.Parse(stYr) ;

//Vehicle column
tb = (TextBox)e.Item .Cells[2].Controls[0];
string stVhcle = tb.Text.Trim(). ToUpper();

TextBox price = (TextBox)e.Item .FindControl("t xtPrice");

string stPrice = price.Text;
//decimal pr = Convert.ToDecim al(stPrice);
//string stPriceVal = pr.ToString();

//Mile column
tb = (TextBox)e.Item .Cells[5].Controls[0];
string dMile = tb.Text;

//Body column
tb = (TextBox)e.Item .Cells[6].Controls[0];
string strBody = tb.Text.Trim(). ToUpper();

string sql = "update car_detail set PRICE ='" + stPrice + "',MILEAGE= '" +
dMile + "',BODY= '" + strBody + "' where car_id = " + key;

if (oracleConnecti on1.State == ConnectionState .Closed)
oracleConnectio n1.Open();
OracleCommand cmd = new OracleCommand(s ql,oracleConnec tion1);
cmd.ExecuteNonQ uery();
catch (Exception ex)

String sql2 = "update car_master set YEAR = '" + stYr + "',VEHICLE= '" +
stVhcle + "' where car_id = " + key;

if (oracleConnecti on1.State == ConnectionState .Closed)
oracleConnectio n1.Open();

OracleCommand cmd2 = new OracleCommand(s ql2,oracleConne ction1);
cmd2.ExecuteNon Query();
catch (Exception ex)

if (oracleConnecti on1.State==Conn ectionState.Ope n)
//DataGrid Non-Editable Mode
DataGrid1.EditI temIndex = -1;
oracleDataAdapt er1.Fill(dsCarL ist1);
DataGrid1.DataB ind();
oracleConnectio n1.Close();


*************** ***********
I'm having trouble updating just the price column. The only way to update
the price column is if the user edits several columns and then the price
column updates.

I want the user to be able to update a single column at a time and not have
to update multiple columns at the same time.

I don't know what I'm doing wrong. I'm thinking that my select commandtext
statement is the problem.

Any suggestions would be greatly appreciated.

If there are better ways of updating individual datagrid cells back to the
database, please provide some c# code examples.



Nov 19 '05 #1
0 1635

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