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he MySQL server is well known for its lightweight and high-performance features, but did you know it can also be used as an embedded database for your enterprise applications This chapter explains the concepts of embedded applications and how to use the MySQL C API for creating your own embedded MySQL applications. I ll introduce you to the techniques for compiling the embedded server and writing applications for both Linux and Windows.
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Numerous applications have been built using lightweight database systems as internal data storage. If you use Microsoft Windows as your primary desktop operating system, the chances are you have seen or used at least one application that uses the Microsoft Access database engine. Even if the application doesn t advertise the use of Access, you can usually tell with just a cursory peek at the installation directory. Some embedded applications use existing database systems on the host computer (like Access) while others use dedicated installations of larger database systems. Less obvious are those applications that include database systems compiled into the software itself.
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What Is an Embedded System
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An embedded system is a system that is contained within another system. Simply put, the embedded system is a slave to the host system. The purpose of the embedded system is to provide some functionality that the host system requires. This could be communication mechanisms, data storage and retrieval, or even graphical user displays. Embedded systems have traditionally been thought of as dedicated hardware or electronics. For example, an automated teller machine (ATM) is an embedded system that contains dedicated hardware. Today, embedded systems include not only dedicated hardware but also dedicated software systems. Unlike embedded hardware that is difficult or impossible to modify, embedded software is often modified to work in the specific environment. Embedded hardware and software share the quality of being self-contained and providing some service to the host system. Embedded software systems are not typically the same applications as you see and use on a daily basis. Some, like those that use the embedded MySQL library, are adaptations of existing functionality rebuilt in order to work more efficiently inside another software system. However, unlike its stand-alone server version, the embedded MySQL server is designed to operate at a programmatic level. That is, the calls to the server are done via a programming language and
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CHAPTER 6 EMBEDDED MYSQL
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not as ad hoc queries. Methods are exposed in the embedded server to take ad hoc queries as parameters and to initiate the server to execute them. This means that the embedded MySQL server can only be accessed via another application. However, as you will see in the next few sections, embedded software can exist in a number of applications ranging in their level of integration from a closed programmatic-only access to a fully functional system that is hidden by the host application. Let s first look at the most common types of embedded systems.
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Types of Embedded Systems
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There are many types of embedded systems. They can be difficult to classify because of the unique nature of their use. However, embedded systems generally fall into one (or more) of these categories: Real-time: A system that is used in installations that require a response and action within a given threshold on the part of the host system. The feature most common to this set of systems is timing. The execution time of every command process must be minimized to achieve the goals of the system. Often these systems are required to perform within events that occur externally rather than any internal processing speed. An example of a real-time system would be a router or a telecommunications switch. Reactive: A system that responds solely to external events. These events tend to be recurring and cyclic in nature, but may also be in the form of user input (interactive systems are reactive systems). Reactive systems are designed to always be available for operation. Timing is usually secondary and limited only by the frequency of the cyclic operations. An example of a reactive system would be a safety monitoring system designed to page or alert service personnel when certain events or thresholds occur. Process control: A system designed to control other systems. These systems tend to be those designed to monitor and control hardware devices such as robots and processing machinery. These systems are typically programmed to repeat a series of actions and generally do not vary from their intended programming or respond to external events or the threshold of status variables or conditions. An example of a process control system is the robot used on an automotive assembly line that assembles a specific component of the automobile. Critical: A system that is used in installations that have a high cost factor such as safety, medical, or aviation. These systems are designed so that they cannot fail (or should never fail). Often these systems include variants of the embedded systems described earlier. An example of a critical system would include medical systems such as a respirator or artificial circulatory system.
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