Description
If the network connection is lost and then re-connected during an ODBC session using version 17.00.0004 the next query will throw an "Attempted to read or write protected memory" exception which cannot be caught. Version 16.00.00 throws exception "The connection has been disabled (or lost). ERROR [08S01] server closed the connection unexpectedly" which can be caught and acted upon which is the desired behavior.
Example Visual Studio 2022 .NET 8 Windows Forms Visual Basic code which demonstrates this issue:
Try
Dim cs As New Odbc.OdbcConnectionStringBuilder
cs.Clear()
cs.Driver = "PostgreSQL Unicode(x64)"
cs.Add("Database", "database")
cs.Add("Servername", "host")
cs.Add("UID", "user")
cs.Add("PWD", "password")
Dim c As Odbc.OdbcConnection = New Odbc.OdbcConnection With {.ConnectionString = cs.ConnectionString}
c.Open()
Dim sql As Odbc.OdbcCommand = c.CreateCommand
sql.CommandType = CommandType.Text
sql.CommandText = "SELECT count(*) FROM anytable"
sql.ExecuteScalar()
MsgBox("psqlODBC exception test: disconnect then re-connect network")
sql.ExecuteScalar() ' unhandled exception here
Catch ex As Exception
MsgBox(ex.ToString)
End Try
Exception text:
System.AccessViolationException
HResult=0x80004003
Message=Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
Source=
StackTrace:
[Managed to Native Transition]
System.Data.Odbc.dll!System.Data.Odbc.OdbcConnectionHandle.ReleaseHandle() Unknown
System.Private.CoreLib.dll!System.Runtime.InteropServices.SafeHandle.InternalRelease(bool disposeOrFinalizeOperation) Unknown
System.Private.CoreLib.dll!System.Runtime.InteropServices.SafeHandle.Dispose() Unknown
System.Data.Odbc.dll!System.Data.Odbc.OdbcConnection.Close() Unknown
System.Data.Odbc.dll!System.Data.Odbc.OdbcConnection.ConnectionIsAlive(System.Exception innerException) Unknown
System.Data.Odbc.dll!System.Data.Odbc.OdbcConnection.HandleErrorNoThrow(System.Data.Odbc.OdbcHandle hrHandle, System.Data.Odbc.ODBC32.SQLRETURN retcode) Unknown
System.Data.Odbc.dll!System.Data.Odbc.OdbcConnection.HandleError(System.Data.Odbc.OdbcHandle hrHandle, System.Data.Odbc.ODBC32.SQLRETURN retcode) Unknown
System.Data.Odbc.dll!System.Data.Odbc.OdbcCommand.ExecuteReaderObject(System.Data.CommandBehavior behavior, string method, bool needReader, object[] methodArguments, System.Data.Odbc.ODBC32.SQL_API odbcApiMethod) Unknown
System.Data.Odbc.dll!System.Data.Odbc.OdbcCommand.ExecuteReaderObject(System.Data.CommandBehavior behavior, string method, bool needReader) Unknown
System.Data.Odbc.dll!System.Data.Odbc.OdbcCommand.ExecuteScalar() Unknown
psqlodbc_17_0004_exception.dll!psqlodbc_17_0004_exception.Form1.Form1_Load(Object sender, System.EventArgs e) Line 43 Basic