SqlCeResultSet
Sep 13, 2007
How can i get the current row index of SqlCeResultSet specially after calling Seek method?
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SQLCeResultSet + Filter
May 17, 2007Is there anyway to filter a existing SQLCEReusltSet?
Paging On SqlCeResultSet
Aug 17, 2007Hi
I am using SqlCeResult and i want to give paging on that and read in help that you can do paging on ResultSet so . I need code example so that i can understand how to implement this in resultSet.
Thanks & Regards
Vishal
Insert Identity Value With SqlCeResultSet
Aug 20, 2007Hi
I have a table with an identity column. This is set to increase by 1 and start on 1, and is the first column of the table.
When I insert a record into the resultset, I get an error stating that it can't be DbNull.
Th record is created from a resultset with the query "Select * from table", so the id should be included
But as I understand it, it should be increasing automatically, right? Becuase that's the behaviour of the normal sql Insert command. I have seen an article that just left the id column in the record alone before inserting it, but it didn't help me.
How can I sidestep this issue?
SQLCeResultset, Connections And Performance
Sep 25, 2007I am currently working with typed sqlceresultsets. I noticed that each resultset manages its own databaseconnection. I am considering to change this to a situation where I can reuse a databaseconnection on more than one sqlresultset.
Will this result in better performance? for example, when I have 2 updates for wicht I need 2 resultsets, wouldn't it be better to use 1 connection and transaction instead of each resultset creating/disposing its own? I would realy like to hear some oppinions. thanks!
Update Database Using Sqlceresultset
Aug 21, 2007Hi,
I have an updateable sqlceresultset, which i use to bind to a datagrid. The user can modify values in the grid. I wish to update these values in the database only when the user has finished making these changes and clicks "Accept" button. But with the sqlceresultset, it looks like with every modification in the grid, the resultset is updated and change is written to the sdf database file . Please suggest how to work around this.
Thanks
SqlCeResultSet Performance Vrs OLEDB
May 23, 2007Hi I have written an Windows Mobile Application that insert 1000 records on SQL Compact 3.1 but I am having performance issues. If I use SqlCeResultSet and SqlCeUpdatableRecord in C# tha insert take 7 seconds to complete. But if I write a C++ application that uses OLEDB it takes only 4 seconds.
How can I improve the performance of the C# application? Also I would like to know if there is any possibility to use the same OLEDB objects that I use in C++ in a C# application.
Thanks a lot
How To Update An SDF Database With A SqlCEResultSet
May 4, 2008I have created my connection correctly
if (_deviceConn.State == ConnectionState.Closed)
_deviceConn.Open();
_deviceCMD = new SqlCeCommand("UPDATE metar SET observation='"+ Value1 +"',lastupdate='"+ Value2 +"',Valid_Time='"+ Value3+"' WHERE aerodrome_oaci_code='"+ FilterValue +"'", _deviceConn);
int RecordsAffected = _deviceCMD.ExecuteNonQuery();
The code executes fine, in fact the recordsaffected returns 1, but Nothing happend on database side. Another thing is, when i run the project on release mode, a copy of the SDF file is there, so, which of the sdf files the project is actually updating?, cause im querying both (the one in my project source path and the one copied to release folder) and both have the same data witout any modification.
My Copy to output directory setting is = Copy if newer.
If i try this with query analizer works just fine.
Any ideas?
SqlCeResultSet - Problem After Deleting First Record
Oct 4, 2006
Hi,
I've noticed that after the first record from a ResultSet is deleted, HasRows property throws an exception like "The current row was deleted." Method ReadFirst() throws similar exception as well.
More details:
1. Create a ResultSet: ExecuteResultSet(ResultSetOptions.Updatable | ResultSetOptions.Scrollable | ResultSetOptions.Sensitive)
2. Let's say, there is no records in the resultset. Insert two new ones. Then call: ReadAbsolute(0); Delete(); HasRows; and the exception is thrown.
3. Then you can call ReadFirst() or Read with the same result.
4. Now call ReadAbsolute(0). It returns true. Call HasRows, ReadFirst() or Read() and you will get the exception each time.
I tried to explain this with the fact that Delete() doesn't change the current position of the ResultSet. But I don't see why that would mess the HasRows property or why after ReadAbsolute(0) retuns true, HasRows or ReadFirst() doesn't work.
Could anybody tell me what the problem is?
Thank you.
SQL Mobile - SQLCEResultSet - Fast Retreival
May 23, 2007Hi,
I am trying to develope a Pocket PC application using MS Visual Studio 2005 (C#)and the database is in the device (.sdf file).
Am trying to retreive a single row from a table containing around 10000 rows. I would like to know the fastest method to retreive the values.
whether it is faster to use an SQLDataAdapter to retreive the values to a dataset or datatable OR retreive the values to a SQLCEResultSet OR is there any other faster retreival method.
Please advice
Thanks,
Anujith
SqlCeResultSet - Problem After Deleting First Record
Oct 3, 2006Hi,
I've noticed that after the first record from a ResultSet is deleted, HasRows property throws an exception like "The current row was deleted." Method ReadFirst() throws similar exception as well.
More details:
1. Create a ResultSet: ExecuteResultSet(ResultSetOptions.Updatable | ResultSetOptions.Scrollable | ResultSetOptions.Sensitive)
2. Let's say, there is no records in the resultset. Insert two new ones. Then call: ReadAbsolute(0); Delete(); HasRows; and the exception is thrown.
3. Then you can call ReadFirst() or Read with the same result.
4. Now call ReadAbsolute(0). It returns true. Call HasRows, ReadFirst() or Read() and you will get the exception each time.
I tried to explain this with the fact that Delete() doesn't change the current position of the ResultSet. But I don't see why that would mess the HasRows property or why after ReadAbsolute(0) retuns true, HasRows or ReadFirst() doesn't work.
Could anybody tell me what the problem is?
Thank you.
Update TextBox Binding To SQLCeResultSet
Jan 31, 2008Hello,
I'm trying to develop a VB.NET (2005) form with just a ComBobox and a TextBox.
I bind a combobox with the SqlCeResultset (Scrollable | Updatable ). Do the same with the TextBox.
Combobox1.DataSource = rsResultSet
TextBox1.DataBindings.Add("Text", rsResultSet, "Obs")
This works (when I change the Combo item the textbox changes as well) but any changes to the textbox text do not reach the DB.If i change the Combobox item and back the old data is still there. If i look at the result
set it does appear as updateable.
How can I update the SqlCeResultset when I change the TextBox text?
Thanks
Obtain Sqlceresultset Table Schema With GetSchemaTable
May 4, 2006I have a SqlCeResult pointing to a table :
Public conexion As Data.SqlServerCe.SqlCeConnection = New Data.SqlServerCe.SqlCeConnection("Data Source=iPAQ File StoreGestionAlmacenN.sdf")
Public ComandoCargaProductos As Data.SqlServerCe.SqlCeCommand = conexion.CreateCommand
Public ResultSetProductos As Data.SqlServerCe.SqlCeResultSet
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load
conexion.Open()
'**********************************************************
'************Conexion con Tabla Productos******************
'ComandoCargaProductos.CommandText = "SELECT * from [Productos]"
ComandoCargaProductos.CommandType = Data.CommandType.TableDirect
ComandoCargaProductos.IndexName = "PK__Productos__0000000000000041"
ComandoCargaProductos.CommandText = "Productos"
ResultSetProductos = ComandoCargaProductos.ExecuteResultSet(Data.SqlServerCe.ResultSetOptions.Scrollable Or Data.SqlServerCe.ResultSetOptions.Updatable)
End Sub
And I want to obtain the schema of the table which my resultset is pointing
Dim tabla As Data.DataTable
tabla = Me.ResultSetProductos.GetSchemaTable
But the datatable that i obtain donīt seem to have the schema that i need, for example donīt have the primary keys i have define and also donīt have any constrains......
Does anybody know the problem?
Thanks for your help
SqlCeResultSet Looses Updatable Option If Query Has 2 Params
Feb 26, 2008i have result set from such query :
resultSetOptions = System.Data.SqlServerCe.ResultSetOptions.Scrollable | System.Data.SqlServerCe.ResultSetOptions.Updatable;
queryText =
SELECT agvb_id as ID
,agvb_cat_id as Category
,agv_brn_id as Brand
,agvb_brn_name as BrandName
,agv_brn_area as Area
,agv_brn_sku_qty as SkuQuantity
,agv_brn_qty as Quantity
,agv_orderliness as Orderliness
,agvb_importance as Importance
FROM AGENTS_VISITS_BRANDS
WHERE (AGENTS_VISITS_BRANDS.agvb_agv_id = @agv_id)
AND (AGENTS_VISITS_BRANDS.agvb_cat_id = @dad_id)
ORDER BY agvb_brn_name
if i open resultSet with such qury it looses its updatable option.
If i remove from where 1 param (no mater which) everything runs ok.
Unspecified Error When Inserting/updating Record Using SqlCeResultSet On Sql Compact
Nov 14, 2007Hi,
Inside a single transaction I'm inserting/updating multiple records into multiple tables, in this order:
table 1 record 1
table 2 record 1
table 3 record 1
table 1 record 2
table 2 record 1
table 1 record 3
table 2 record 3
table 3 record 3
Now I'm getting an unspecified error on a certain table:
Unspecified error [ 3,-1300704038,-1834095882,activitypointerBase,x lock (x blocks),PAG (idx): 1078 ]
From msdn I see that:
PAG (idx) means a lock on an index page.
x lock means an exclusive lock:
Indicates a data modification, such as an insert, an update, or a deletion. Ensures that multiple updates cannot be made to the same resource at the same time. (I assume that multiple updates within the SAME transaction can be made, only multiple updates from different transaction cannot be made, right?)
I cannot find any reference to this error message and don't know what the numbers mean. Maybe it relates to data that can be found in the sys.lock_information table like explained here, http://technet.microsoft.com/en-us/library/ms172932.aspx, but I'm not sure.
Furthermore, the sys.lock_information table is empty. I haven't been able to reproduce the problem myself. I only received an error log and the database to investigate it.
So, does anybody have an idea what this error message means and what I can do to troubleshoot this?
Thanks,
Jeffry
BindingSource ListChanged Does Not Fire For New Records In SqlCeResultSet With Sensitive Option
Nov 6, 2007I have an updateable and sensitive SqlCeResultSet that is bound to a DataGrid via a BindingSource. All updates to the resultset are programmatic. Changes to an existing record in the resultset are visible in the DataGrid and I am getting corresponding ListChanged events fired from the BindingSource. When I perform an database update independent of the resultset that changes resultset membership, I can peform a ReadLast and see the additional records; however the ListChanged event does not fire. Also, when I explicitly "create" a new record in the resultset I do not get a ListChanged event and in both cases the DataGrid does not display the records. Re-binding to the existing resultset does not appear to work either. Only when I create a new resultset and bind do the new or records display.
Using Compact Framework 2.0.
Any suggestions are appreciated.