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A string containing the Unicode database version used (for example, '510')
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Note
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For further details about the Unicode character database, see http://wwwunicodeorg
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his chapter describes the programming interfaces that Python uses to interface with relational and hash table style databases Unlike other chapters that describe specific library modules, the material in this chapter partly applies to third-party extensions For example, if you want Python to interface with a MySQL or Oracle database, you would first have to download a third-party extension moduleThat module, in turn, would then follow the basic conventions described here
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Relational Database API Specification
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For accessing relational databases, the Python community has developed a standard known as the Python Database API Specification V20, or PEP 249 for short (the formal description can be found at http://wwwpythonorg/dev/peps/pep-249/) Specific database modules (eg, MySQL, Oracle, and so on) follow this specification, but may add even more featuresThis section covers the essential elements needed to use it for most applications At a high level, the database API defines a set of functions and objects for connecting to a database server, executing SQL queries, and obtaining results Two primary objects are used for this: a Connection object that manages the connection to the database and a Cursor object that is used to perform queries
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To connect to a database, every database module provides a module-level function connect(parameters)The exact parameters depend on the database but typically include information such as the data source name, user name, password, host name, and database nameTypically these are provided with keyword arguments dsn, user, password, host, and database, respectively So, a call to connect() might look like this:
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connect(dsn="hostname:DBNAME",user="michael",password="peekaboo")
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If successful, a Connection object is returned An instance c of Connection has the following methods:
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cclose()
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Closes the connection to the server
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Commits all pending transactions to the database If the database supports transactions, this must be called for any changes to take effect If the underlying database does not support transactions, this method does nothing
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Rolls back the database to the start of any pending transactionsThis method is sometimes used in databases that do not support transactions in order to undo any changes made to the database For example, if an exception occurred in code that was in the middle of updating a database, you might use this to undo changes made before the exception
ccursor()
Creates a new Cursor object that uses the connection A cursor is an object that you will use to execute SQL queries and obtain resultsThis is described in the next section
Cursors
In order to perform any operations on the database, you first create a connection c and then you call ccursor() method to create a Cursor object An instance cur of a Cursor has a number of standard methods and attributes that are used to execute queries:
curcallproc(procname [, parameters])
Calls a stored procedure with name procname parameters, which is a sequence of values that are used as the arguments to the procedureThe result of this function is a sequence with the same number of items as parametersThis sequence is a copy of parameters where the values of any output arguments have been replaced with their modified values after execution If a procedure also produces an output set, it can be read using the fetch*() methods described next
curclose()
Closes the cursor, preventing any further operations on it
curexecute(query [, parameters])
Executes a query or command query on the database query is a string containing the command (usually SQL), and parameters is either a sequence or mapping that is used to supply values to variables in the query string (this is described in the next section)
curexecutemany(query [, parametersequence])
Repeatedly executes a query or command query is a query string, and parametersquence is a sequence of parameters Each item in this sequence is a sequence or mapping object that you would have used with the execute() method shown earlier
curfetchone()
Returns the next row of the result set produced by execute() or executemany() The result is typically a list or tuple containing values for the different columns of the result None is returned if there are no more rows available An exception is raised if there is no pending result or if the previously executed operation didn t create a result set