dataadapter Update problem

Question

5.00/5 (1 vote)

See more:

iv'e got an assignment witch requires me to update the northwind database , iv'e done every thing like the tutorials say as follows
i fill The DataTable Using The DataAdapter.Fill(table);
i build the Delete,Insert,Update Commands using CommangBuilder

SqlDataAdapter adapter = new SqlDataAdapter(selectStr, conn);
        SqlCommandBuilder builder = new SqlCommandBuilder(adapter); 
        adapter.DeleteCommand = builder.GetDeleteCommand(true);
        adapter.UpdateCommand = builder.GetUpdateCommand(true);
        adapter.InsertCommand = builder.GetInsertCommand(true);
        adapter.Fill(employees_table);

i also set a primary key for the table :

DataColumn[] employees_keys = new DataColumn[2];
employees_keys[0] = employees.Columns["EmployeeID"];
employees_table.PrimaryKey = employees_keys;

now iv'e attempted to delete and add a row :

//accepts an employee object and creates a new new row with the appropriate values for 
// an employee table row 
DataRow row = ConvertEmployeeToRow(employeeToAdd);
employee_table.Rows.Add(row);`

and deleting a row :

DataRow row = employees.Rows.Find(employeeToDismiss.ID);
employees.Rows.Remove(row);

i should also point out that iv'e attempted to use row.SetAdded() and row.Delete()
any ways at the end when i try to update the database

int k = employees_adapter.Update(employees_table);

on added rows sometimes k get valued , on remove never , and in either case nothing really gets updated at all in the data base it self .
any insight of what i'm doing wrong would be most appreciated.

Posted 2-Jul-11 15:44pm

eranotz50

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

mpathfinder · Answer 1 · 2011-07-03T02:41:00

To add a row to a DataTable try using NewRow() method of your "employees" DataTable and then assign new values columns of this new row

Remove method of DataTable does'n delete a row . it just remove a row from DataTable . try using Delete() method of datatable .

the pseudo code could be something like :

// Adding a row<br />
DataRow row = employees.NewRow();<br />
row["someField1"] = someText1 ;<br />
row["someField2"] = someText2<br />
employees.Rows.Add(row);<br />
<br />
// Deleteing a row<br />
employees.Rows.Find(employeeToDismiss.ID).Delete();<br />
<br />
int k = employees_adapter.Update(employees_table);