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CHAPTER 6 EMBEDDED MYSQL
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Connecting to and establishing a server instance Disconnecting from the server Shutting down the server using a controlled (safe) mechanism Manipulating server startup options Handling errors Generating DBUG trace files Issuing queries and retrieving the results Managing data Accessing the (near) full feature set of the MySQL server This last point is one of the most significant differences between the stand-alone server and the embedded server. The embedded server does not use the full authentication mechanism and is disabled by default. This is one of the reasons an embedded MySQL system could be challenging to secure (see the later section Security Concerns for more details). However, you can turn on the authentication using the configuration option --with-embedded-privilege-control and recompile the embedded server. Other than that, the server behaves nearly identically to the stand-alone server with respect to features and capabilities. What is really cool is that since the embedded library uses the same access methods as the stand-alone server, all of the databases and tables you create using the stand-alone server can be used with the embedded server. This allows you to create the tables and test them using the stand-alone server, then move them to the embedded system later. Although it is possible to have both access the same data directory, it is strictly discouraged and can result in loss of data and unpredictable behavior (you should never share data directories among MySQL server instances). Does this mean you can have a stand-alone server executing on the same machine as an embedded server Not only yes, but how many embedded servers would you like As long as the embedded server instances aren t using the same data directory, you can have several running at the same time. It should be noted that the data each manages is separate from the data the others manage no data is shared. I tried this out on my own system and it works. I ve a 5.0.22 (Generally Available) GA embedded application running right alongside my 5.1.9-beta stand-alone server. I didn t have to stop or even interrupt the stand-alone to interact with the embedded server. How cool is that
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Note MySQL AB acknowledged at the 2006 MySQL Users Conference that the embedded server included in version 5.1 was not working properly. However, the 5.0 source code has working embedded server code. All of the examples in this chapter are based on the 5.0.22 GA release of the server source code. I suspect by the time you read this, MySQL AB will have fixed the problems with 5.1. The examples in this chapter should be compatible with future releases of the 5.1 source code.
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CHAPTER 6 EMBEDDED MYSQL
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Methods of Embedding MySQL
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There are many types of embedded applications. Embedded database applications typically fall into one of three categories. They are either partially hidden behind another interface (server embedding), part of a dedicated set of hardware and software isolated from the network (platform embedding), or a system that wraps or contains the database server (deep embedding). The following sections describe each of these types with respect to embedding the MySQL system.
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Server embedding is a system that is built with a stand-alone installation of the MySQL server. Instead of making MySQL available to anyone on the system or network, the server-level embedded system hides the MySQL server by turning off external (network) access. Thus, this form of an embedded MySQL system is simply a stand-alone server that has had its network access (TCP/IP) turned off. However, this type of embedded MySQL system has the advantage that the server can be maintained using locally installed (and properly configured) client applications. So rather than having to load data using external applications, the system integrators, administrators, and developers can use the normal set of administration and development tools to maintain the embedded MySQL server. One example of a server-level embedded MySQL system is the LeapTrack software produced by LeapFrog (www.leapfrogschoolhouse.com/do/findsolution detailPage=overview&name= ReadingPro). MySQL reports that LeapFrog chose MySQL for its cross-platform support, allowing them to offer their product on a variety of platforms without changing the core database capabilities. Until then, LeapFrog had been using different proprietary database solutions for their various platforms.
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