Question About Data Access To SQL Compact DB / Server

Jul 8, 2007

I am used to work with relational SQL Server databases in other editions and am fairly new to SQL compact. I have installed the compact edition and successfully opened a connection and worked with DB objects in the Compact edition, using Server Management Studio.

I have 2-3 questions:
- Are there any means / drivers / data access installations that would allow me to connect to a SQL Compact database using the data access means that I am used to in other editions of SQL Server? In other words, can I install a data-access "converter" that would know how to talk to the SQL Compact databases over the usual TCP/1434 protocol (or any other port)? I am looking for this feature in order to connect to the SQL Compact the same way I connect to any other relational database. Right now, I am using Toad for SQL Server and it would be nice if I could connect to a SQL Compact.

- With other (non-Compact) editions, I can create an alias to a SQL Server and then specify the means to connect to the server. Can I create an alias to a SQL Compact database/server? I tried but unsuccessfully. This relates to my previous question- If I could create an alias, then I could (I imagine) connect to the Compact databases/server the same way I connect to any relational database using the alias.

- Are there any tutorials for people who are used to working with other (non-Compact) editions that are starting to work with Compact? Any BOL sections that explain the differences between other editions and Compact, from a management-tools/connectivity standpoint? I found some literature; wondering if there's something more detailed out there.

Thank you in advance.

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------------------------------------------------------------------------------
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-----------------------------------------------------------------------------

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From Newbie to Newbie,



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'Microsoft ActiveX Data Objects 2.8 Library

'Microsoft ADO Ext.2.8 for DDL and Security

'Microsoft Jet and Replication Objects 2.6 Library

--------------------------------------------------------

Imports System.IO

Imports System.IO.File





Code Snippet

'BACKUP DATABASE

Public Shared Sub Restart()

End Sub



'You have to have a BackUps folder included into your release!

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Dim z As String
Dim g As String
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End Try



MsgBox("Backup completed succesfully.")
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End If
End Sub






Code Snippet

'RESTORE DATABASE

Private Sub RestoreDB_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles

RestoreDB.Click
Dim Filename As String
Dim Restart1 As New RestoreRestart
Dim overwrite As Boolean
overwrite = True
Dim xi As String


With OpenFileDialog1
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If .ShowDialog() = Windows.Forms.DialogResult.OK Then
Filename = .FileName



'Strips restored database from the timestamp
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End If
End With


'Notify user
MsgBox("Data restored successfully")


Restart()
If Restart1.ShowDialog = Windows.Forms.DialogResult.OK Then
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End If
End Sub








Code Snippet

'CREATE NEW DATABASE

Private Sub CreateNewDB_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles

CreateNewDB.Click
Dim L As New DatabaseEraseWarning
Dim Cat As ADOX.Catalog
Cat = New ADOX.Catalog
Dim Restart2 As New NewDBRestart
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If L.ShowDialog() = Windows.Forms.DialogResult.Cancel Then
Exit Sub
Else
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End If
End If
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Dim col1 As ADOX.Column = New ADOX.Column
Dim col2 As ADOX.Column = New ADOX.Column
Dim col3 As ADOX.Column = New ADOX.Column
Dim col4 As ADOX.Column = New ADOX.Column
Dim col5 As ADOX.Column = New ADOX.Column
Dim col6 As ADOX.Column = New ADOX.Column
Dim col7 As ADOX.Column = New ADOX.Column
Dim col8 As ADOX.Column = New ADOX.Column

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Tablename = New ADOX.Table



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OLEDB:Engine Type=5")


'Open the Catalog
Cat.ActiveConnection = Cn



'Create the table (you can name it anyway you want)
Tablename.Name = "Table1"


'Taylor according to your need - add so many column as you need. Watch for the DataType!
col.Name = "ID"
col.Type = ADOX.DataTypeEnum.adInteger
col1.Name = "MA"
col1.Type = ADOX.DataTypeEnum.adInteger
col1.Attributes = ADOX.ColumnAttributesEnum.adColNullable
col2.Name = "FName"
col2.Type = ADOX.DataTypeEnum.adVarWChar
col2.Attributes = ADOX.ColumnAttributesEnum.adColNullable
col3.Name = "LName"
col3.Type = ADOX.DataTypeEnum.adVarWChar
col3.Attributes = ADOX.ColumnAttributesEnum.adColNullable
col4.Name = "DOB"
col4.Type = ADOX.DataTypeEnum.adDate
col4.Attributes = ADOX.ColumnAttributesEnum.adColNullable
col5.Name = "Gender"
col5.Type = ADOX.DataTypeEnum.adVarWChar
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col6.Type = ADOX.DataTypeEnum.adVarWChar
col6.Attributes = ADOX.ColumnAttributesEnum.adColNullable
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col7.Type = ADOX.DataTypeEnum.adVarWChar
col7.Attributes = ADOX.ColumnAttributesEnum.adColNullable
col8.Name = "Notes"
col8.Type = ADOX.DataTypeEnum.adVarWChar
col8.Attributes = ADOX.ColumnAttributesEnum.adColNullable



Tablename.Keys.Append("PrimaryKey", ADOX.KeyTypeEnum.adKeyPrimary, "ID")


'You have to append all your columns you have created above
Tablename.Columns.Append(col)
Tablename.Columns.Append(col1)
Tablename.Columns.Append(col2)
Tablename.Columns.Append(col3)
Tablename.Columns.Append(col4)
Tablename.Columns.Append(col5)
Tablename.Columns.Append(col6)
Tablename.Columns.Append(col7)
Tablename.Columns.Append(col8)



'Append the newly created table to the Tables Collection
Cat.Tables.Append(Tablename)



'User notification )
MsgBox("A new empty database was created successfully")


'clean up objects
Tablename = Nothing
Cat = Nothing
Cn.Close()
Cn = Nothing


'Restart application
If Restart2.ShowDialog() = Windows.Forms.DialogResult.OK Then
Application.Restart()
End If

End Sub








Code Snippet



'COMPACT DATABASE

Private Sub CompactDB_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles

CompactDB.Click
Dim JRO As JRO.JetEngine
JRO = New JRO.JetEngine


'The first source is the original, the second is the compacted database under an other name.
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FilesVSoftAppMissNewAppDB.mdb; Jet OLEDB:Engine Type=5", "Provider=Microsoft.Jet.OLEDB.4.0;

Data Source=C:Program FilesVSoftAppMissNewAppDBComp.mdb; JetOLEDB:Engine Type=5")


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File.Delete("C:Program FilesVSoftAppMissNewAppDB.mdb")


'Compacted database is renamed to the original databas's neme.
Rename("C:Program FilesVSoftAppMissNewAppDBComp.mdb", "C:Program FilesVSoftAppMissNewAppDB.mdb")


'User notification
MsgBox("The database was compacted successfully")

End Sub

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How can I tell if the System.Data.SqlServerCe assembly I am referencing is meant for Desktop use as opposed to Compact development? We are using NUnit as our testing framework and I get the following error when I attempt to execute nunit-console on my test fixture referencing SqlServerCe:

System.IO.FileLoadException : Could not load file or assembly 'System.Data.SqlServerCe, Version=9.0.242.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040) ---->

System.IO.FileLoadException : Could not load file or assembly 'System.Data.SqlServerCe, Version=3.0.3600.0, Culture=neutral, PublicKeyToken=3be235df1c8d2ad3, Retargetable=Yes' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)


The unit tests run fine from inside of Visual Studio using the Resharper Unit Test Runner...

Matt

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