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CHAPTER 13 ■ DATABASE SUPPORT 295 A Quick Summary This chapter has given a rather brief introduction to making Python programs interact with relational databases. It’s brief because, if you master Python and SQL, the coupling between the two, in the form of the Python DB API, is quite easy to master. Here are some of the concepts covered in this chapter: The Python DB API. A simple, standardized interface that database wrapper modules should conform to, to make it easier to write programs that will work with several different databases. Connections. A connection object represents the communication link with the SQL database. From it, you can get individual cursors, using the cursor method. You also use the connection object to commit or roll back transactions. After you’re done with the database, the connection can be closed. Cursors. A cursor is used to execute queries and to examine the results. Resulting rows can be retrieved one by one, or many (or all) at once. Types and Special Values. The DB API specifies the names of a set of constructors and special values. The constructors deal with date and time objects, as well as binary data objects. The special values represent the types of the relational database, such as STRING, NUMBER, and DATETIME. SQLite. A small, embedded SQL database, whose Python wrapper is called pysqlite. It’s fast and simple to use, and does not require a separate server to be set up. New Functions in This Chapter Function connect(...) Description Connect to a database and return a connection object a a. The parameters to the connect function are database dependent. What Now? Persistence and database handling is an important part of many, if not most, big program systems. Another component shared by a great number of such systems is dealt with in the next chapter . . .
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