Oracle 5.0 Reference Manual page 1944

the MySQL Enterprise Monitor server to monitor. The parameter
the data to MySQL Enterprise Monitor, in seconds.
20.2.5.14.2. Building Custom Listeners
To build custom listeners that work with the MySQL Connector/Net Trace Source, it is necessary to
understand the key methods used, and the event data formats used.
The main method involved in passing trace messages is the
This has the prototype:
public void TraceEvent(
TraceEventType eventType,
int id,
string format,
params Object[] args
)
This trace source method will process the list of attached listeners and call the listener's
TraceListener.TraceEvent
method is as follows:
public virtual void TraceEvent(
TraceEventCache eventCache,
string source,
TraceEventType eventType,
int id,
string format,
params Object[] args
)
The first three parameters are used in the standard as
contain MySQL-specific trace information. Each of these parameters is now discussed in more detail.
int id
This is a MySQL-specific identifier. It identifies the MySQL event type that has occurred, resulting in a
trace message being generated. This value is defined by the
contained in the MySQL Connector/Net code:
public enum MySqlTraceEventType : int
{
ConnectionOpened = 1,
ConnectionClosed,
QueryOpened,
ResultOpened,
ResultClosed,
QueryClosed,
StatementPrepared,
StatementExecuted,
StatementClosed,
NonQuery,
UsageAdvisorWarning,
Warning,
Error
}
The MySQL event type also determines the contents passed using the parameter
args. The nature of the
string format
This is the format string that contains zero or more format items, which correspond to objects in the
args array. This would be used by a listener such as
the output device.
Connector/Net Programming
method. The prototype for the
parameters are described in further detail in the following material.
args
1924
postInterval
TraceSource.TraceEvent
TraceListener.TraceEvent
defined by Microsoft. The last three parameters
MySqlTraceEventType
ConsoleTraceListener
is how often to post
method.
public enum
params Object[]
to write a message to