The SQL Anywhere .NET provider supports tracing using the .NET tracing feature. Note that tracing is not supported on Windows Mobile.
By default, tracing is disabled. To enable tracing, specify the trace source in your application's configuration file.
The following is an example of a configuration file:
<?xml version="1.0" encoding="utf-8" ?> <configuration> <system.diagnostics> <sources> <source name="iAnywhere.Data.SQLAnywhere" switchName="SASourceSwitch" switchType="System.Diagnostics.SourceSwitch"> <listeners> <add name="ConsoleListener" type="System.Diagnostics.ConsoleTraceListener"/> <add name="EventListener" type="System.Diagnostics.EventLogTraceListener" initializeData="MyEventLog"/> <add name="TraceLogListener" type="System.Diagnostics.TextWriterTraceListener" initializeData="myTrace.log" traceOutputOptions="ProcessId, ThreadId, Timestamp"/> <remove name="Default"/> </listeners> </source> </sources> <switches> <add name="SASourceSwitch" value="All"/> <add name="SATraceAllSwitch" value="1" /> <add name="SATraceExceptionSwitch" value="1" /> <add name="SATraceFunctionSwitch" value="1" /> <add name="SATracePoolingSwitch" value="1" /> <add name="SATracePropertySwitch" value="1" /> </switches> </system.diagnostics> </configuration>
There are four types of trace listeners referenced in the configuration file shown above.
ConsoleTraceListener Tracing or debugging output is directed to either the standard output or the standard error stream. When using Microsoft Visual Studio, output appears in the Output window.
DefaultTraceListener This listener is automatically added to the Debug.Listeners and Trace.Listeners collections using the name "Default". Tracing or debugging output is directed to either the standard output or the standard error stream. When using Microsoft Visual Studio, output appears in the Output window. To avoid duplication of output produced by the ConsoleTraceListener, this listener is removed.
EventLogTraceListener Tracing or debugging output is directed to an EventLog identified in the initializeData option. In the example, the event log is named MyEventLog. Writing to the system event log requires administrator privileges and is not a recommended method for debugging applications.
TextWriterTraceListener Tracing or debugging output is directed to a TextWriter which writes the stream to the file identified in the initializeData option.
To disable tracing to any of the trace listeners described above, remove the corresponding add entry under <listeners>.
The trace configuration information is placed in the application's project folder in the App.config file. If the file does not exist, it can be created and added to the project using Visual Studio by choosing Add » New Item and selecting Application Configuration File.
The traceOutputOptions can be specified for any listener and include the following:
Callstack Write the call stack, which is represented by the return value of the Environment.StackTrace property.
DateTime Write the date and time.
LogicalOperationStack Write the logical operation stack, which is represented by the return value of the CorrelationManager.LogicalOperationStack property.
None Do not write any elements.
ProcessId Write the process identity, which is represented by the return value of the Process.Id property.
ThreadId Write the thread identity, which is represented by the return value of the Thread.ManagedThreadId property for the current thread.
Timestamp Write the timestamp, which is represented by the return value of the System.Diagnostics.Stopwatch.GetTimeStamp method.
The example configuration file, shown earlier, specifies trace output options for the TextWriterTraceListener only.
You can limit what is traced by setting specific trace options. By default the trace option settings are all 0. The trace options that can be set include the following:
SATraceAllSwitch All the trace options are enabled. You do not need to set any other options since they are all selected. You cannot disable individual options if you choose this option. For example, the following will not disable exception tracing.
<add name="SATraceAllSwitch" value="1" /> <add name="SATraceExceptionSwitch" value="0" />
SATraceExceptionSwitch All exceptions are logged. Trace messages have the following form.
<Type|ERR> message='message_text'[ nativeError=error_number]
The nativeError=error_number text will only be displayed if there is an SAException object.
SATraceFunctionSwitch All function scope entry/exits are logged. Trace messages have any of the following forms.
enter_nnn <sa.class_name.method_name|API> [object_id#][parameter_names] leave_nnn
The nnn is an integer representing the scope nesting level 1, 2, 3, ... The optional parameter_names is a list of parameter names separated by spaces.
SATracePoolingSwitch All connection pooling is logged. Trace messages have any of the following forms.
<sa.ConnectionPool.AllocateConnection|CPOOL> connectionString='connection_text' <sa.ConnectionPool.RemoveConnection|CPOOL> connectionString='connection_text' <sa.ConnectionPool.ReturnConnection|CPOOL> connectionString='connection_text' <sa.ConnectionPool.ReuseConnection|CPOOL> connectionString='connection_text'
SATracePropertySwitch All property setting and retrieval is logged. Trace messages have any of the following forms.
<sa.class_name.get_property_name|API> object_id# <sa.class_name.set_property_name|API> object_id#
For more information, see "Tracing Data Access" at http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnadonet/html/tracingdataaccess.asp.
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