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Handling Exceptions and Events

In This Chapter

DataBlade API Event Types

Event-Handling Mechanisms

Invoking a Callback

Registering a Callback

Enabling and Disabling a Callback

Retrieving a Callback Function

Using Default Behavior

Default Behavior in a C UDR (Server)

Default Behavior in Client LIBMI Applications

Callback Functions

Declaring a Callback Function

Return Value of a Callback Function

MI_PROC_CALLBACK Modifier (Windows)

Callback-Function Parameters

Writing a Callback Function

Restrictions on Content

Event Information

Database Server Exceptions

Understanding Database Server Exceptions

Warnings and Errors

Status Variables

Providing Exception Handling

Exceptions in a C UDR (Server)

Exceptions in a Client LIBMI Application (Client)

Returning Error Information to the Caller

Defining a User-Defined Error Structure

Implementing the Callback

Handling Multiple Exceptions

Raising an Exception

Specifying the Connection

Specifying the Message

State-Transition Events

Understanding State-Transition Events

Beginning a Transaction

Ending a Session (Server)

Providing State-Transition Handling

State Transitions in a C UDR (Server)

State Transitions in a Client LIBMI Application

Client LIBMI Errors

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