By Grant Allen, Mike Owens
Outside of the area of firm computing, there's one database that permits a big diversity of software program and to flex relational database features, with no the bags and value of conventional database administration structures. That database is SQLite—an embeddable database with an amazingly small footprint, but capable of deal with databases of large measurement. SQLite comes outfitted with an array of strong gains to be had via a number of programming and improvement environments. it's supported by means of languages resembling C, Java, Perl, Hypertext Preprocessor, Python, Ruby, TCL, and extra.
The Definitive advisor to SQLite, moment Edition is dedicated to accomplish assurance of the newest model of this robust database. It deals a radical assessment of SQLite’s features and APIs. The e-book additionally makes use of SQLite because the foundation for supporting newbies make their first foray into database improvement. in just a little while you'll be writing courses as assorted as a server-side browser plug-in or the subsequent nice iPhone or Android software!
- Learn approximately SQLite extensions for C, Java, Perl, Hypertext Preprocessor, Python, Ruby, and Tcl.
- Get reliable insurance of SQLite internals.
- Explore constructing iOS (iPhone) and Android purposes with SQLite.
SQLite is the answer selected for millions of goods around the globe, from cell phones and GPS units to set-top containers and net browsers. you most likely use SQLite each day with out even knowing it!
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Additional resources for The Definitive Guide to SQLite (Expert's Voice in Open Source)
You specify a database’s encoding utilizing the encoding pragma, that are UTF-8, UTF-16, UTF-16le (little endian), and UTF-16be (big endian). eventually there's autovacuum, that you set with the auto_vacuum pragma. while a transaction deletes info from a database, SQLite’s default habit is to maintain the deleted pages round for recycling. The database dossier is still an identical dimension. To unfastened the pages, you want to explicitly factor a vacuum command to reclaim the unused area. The autovacuum characteristic reasons SQLite to immediately cut down the database dossier while information is deleted. this selection is frequently extra important in embedded purposes the place garage is a top rate. when you open a database—file or memory—it may be represented internally via an opaque sqlite3 connection deal with. This deal with represents a unmarried connection to a database. Connection items in extensions summary this deal with and occasionally enforce tools that correspond to API features that take the deal with as an issue. 128 CHAPTER five ■ SQLITE layout and ideas Executing ready Queries As acknowledged past, the ready question strategy is the particular technique wherein SQLite executes all SQL instructions. Executing a SQL command is a three-step method: • coaching: The parser, tokenizer, and code generator organize the SQL assertion through compiling it into VDBE byte code. within the C API, this is often played by way of the sqlite3_prepare_v2() functionality, which talks on to the compiler. The compiler creates a sqlite3_stmt deal with (statement deal with) that includes the byte code and all different assets had to execute the command and iterate over the end result set (if the command produces one). • Execution: The VDBE executes the byte code. Execution is a stepwise procedure. within the C API, each one step is initiated via sqlite3_step(), which factors the VDBE to step throughout the byte code. the 1st name to sqlite3_step() frequently acquires a lock of a few variety, which varies in accordance with what the command does (reads or writes). For decide upon statements, each one name to sqlite3_step() positions the assertion handle’s cursor at the subsequent row of the outcome set. for every row within the set, it returns SQLITE_ROW till it reaches the top, whereupon it returns SQLITE_DONE. For different SQL statements (insert, replace, delete, and so on), the 1st name to sqlite3_step() factors the VDBE to procedure the complete command. • Finalization: The VDBE closes the assertion and deallocates assets. within the C API, this can be played through sqlite3_finalize(), which factors the VDBE to terminate this system, releasing assets and shutting the assertion deal with. every one step—preparation, execution, finalization—corresponds to a respective assertion deal with state—prepared, energetic, or finalized. ready implies that all useful assets were allotted and the assertion is able to be performed, yet not anything has been begun. No lock has been bought, nor will a lock be got until eventually the 1st name to sqlite3_step(). The energetic nation begins with the 1st name to sqlite3_step(). At that time, the assertion is within the strategy of being performed, and a few form of lock is in play.