I have a dynamically created dataset, created thusly:
DataTable dtTime = new DataTable("times");
DataColumn [] dtColumns = new DataColumn[7];
dtColumns[0] = new DataColumn("id", System.Type.GetType("System.String"));
dtColumns[0].AutoIncrement = true;
dtColumns[0].AutoIncrementSeed = 1;
dtColumns[1] = new DataColumn("date",
System.Type.GetType("System.String"));
dtColumns[2] = new DataColumn("proj",
System.Type.GetType("System.String"));
dtColumns[3] = new DataColumn("name",
System.Type.GetType("System.String"));
dtColumns[4] = new DataColumn("desc",
System.Type.GetType("System.String"));
dtColumns[5] = new DataColumn("time",
System.Type.GetType("System.String"));
dtColumns[6] = new DataColumn("saved",
System.Type.GetType("System.Boolean"));
dtTime.Columns.AddRange(dtColumns);
dtTime.PrimaryKey = new DataColumn [] { dtColumns[0] };
this._TimeSheets.Tables.Add(dtTime);
The first column is an autoincrementing ID field, and is also set to be
the primary key.
Later on in my code, in an attempt to either add a new record (row) or
update an existing row, I'm using the following code:
oTask = oFrm.Task;
object [] newRow = new object[7];
if(oTask.TaskID == 0)
{
// add a new row
newRow[0] = null;
}
else
{
// should update already existing row
newRow[0] = oTask.TaskID;
}
newRow[1] = oTask.TaskDate;
newRow[2] = oTask.TaskProject;
newRow[3] = oTask.TaskName;
newRow[4] = oTask.TaskDescription;
newRow[5] = oTask.TaskTime;
newRow[6] = oTask.TaskReported;
this._TimeSheets.Tables["times"].LoadDataRow(newRow, true);
However, on the LoadDataRow call, I'm getting the following exception:
An unhandled exception of type 'System.Data.ConstraintException' occurred
in system.data.dll
Additional information: Column 'id' is constrained to be unique. Value
'1' is already present.
Well of course the id already has a value of '1', I want to update this
row, which is what the LoadDataRow is supposed to do. If it find the row,
based on the primary key, it updates it. Otherwise is inserts a new row.
So why would I be getting this error?? And how can I overcome it??
Thanx! 1 7392
I guess I found my own answer... dunno why this happens, but if I change
the line:
this._TimeSheets.Tables["times"].LoadDataRow(newRow, true);
to
this._TimeSheets.Tables["times"].BeginLoadData();
this._TimeSheets.Tables["times"].AcceptChanges();
this._TimeSheets.Tables["times"].LoadDataRow(newRow, true);
this._TimeSheets.Tables["times"].EndLoadData();
it works as expected... "'Curiouser and curiouser', said Alice..."
On Wed, 19 Oct 2005 09:27:59 -0700, JSheble <js***********@logicor.com>
wrote: I have a dynamically created dataset, created thusly:
DataTable dtTime = new DataTable("times"); DataColumn [] dtColumns = new DataColumn[7]; dtColumns[0] = new DataColumn("id", System.Type.GetType("System.String")); dtColumns[0].AutoIncrement = true; dtColumns[0].AutoIncrementSeed = 1; dtColumns[1] = new DataColumn("date", System.Type.GetType("System.String")); dtColumns[2] = new DataColumn("proj", System.Type.GetType("System.String")); dtColumns[3] = new DataColumn("name", System.Type.GetType("System.String")); dtColumns[4] = new DataColumn("desc", System.Type.GetType("System.String")); dtColumns[5] = new DataColumn("time", System.Type.GetType("System.String")); dtColumns[6] = new DataColumn("saved", System.Type.GetType("System.Boolean")); dtTime.Columns.AddRange(dtColumns); dtTime.PrimaryKey = new DataColumn [] { dtColumns[0] }; this._TimeSheets.Tables.Add(dtTime);
The first column is an autoincrementing ID field, and is also set to be the primary key.
Later on in my code, in an attempt to either add a new record (row) or update an existing row, I'm using the following code:
oTask = oFrm.Task; object [] newRow = new object[7];
if(oTask.TaskID == 0) { // add a new row newRow[0] = null; } else { // should update already existing row newRow[0] = oTask.TaskID; }
newRow[1] = oTask.TaskDate; newRow[2] = oTask.TaskProject; newRow[3] = oTask.TaskName; newRow[4] = oTask.TaskDescription; newRow[5] = oTask.TaskTime; newRow[6] = oTask.TaskReported;
this._TimeSheets.Tables["times"].LoadDataRow(newRow, true);
However, on the LoadDataRow call, I'm getting the following exception:
An unhandled exception of type 'System.Data.ConstraintException' occurred in system.data.dll
Additional information: Column 'id' is constrained to be unique. Value '1' is already present.
Well of course the id already has a value of '1', I want to update this row, which is what the LoadDataRow is supposed to do. If it find the row, based on the primary key, it updates it. Otherwise is inserts a new row. So why would I be getting this error?? And how can I overcome it??
Thanx!
--
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