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sqlite3 Module
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For example, if you call sqlite3register_converter('decimal', decimal Decimal), then you can have values in queries converted to Decimal objects by writing queries such as 'select price as "price [decimal]" from stocks'
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register_adapter(type, func)
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Registers an adapter function for a Python type type that is used when storing values of that type in the datatype func is a function that accepts an instance of type type as input and returns a int, float, UTF-8 encoded byte string, Unicode string, or buffer as a result For example, if you wanted to store Decimal objects, you might use sqlite3register_adapter(decimalDecimal,float)
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complete_statement(s)
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Returns True if the string s represents one or more complete SQL statements separated by semicolonsThis might be useful if writing an interactive program that reads queries from the user
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enable_callback_tracebacks(flag)
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Determines the handling of exceptions in user-defined callback functions such as converters and adapters By default, exceptions are ignored If flag is set to True, traceback messages will be printed on sysstderr
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The Connection object c returned by the connect() function supports the standard operations described in the Database API In addition, the following methods specific to the sqlite3 module are provided
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ccreate_function(name, num_params, func)
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Creates a user-defined function that can be used in SQL statements name is a string containing the name of the function, num_params is an integer giving the number of parameters, and func is a Python function that provides the implementation Here is a simple example:
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def toupper(s): return supper() ccreate_function("toupper",1,toupper) # Sample use in a query cexecute("select toupper(name),foo,bar from sometable")
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Although a Python function is being defined, the parameters and inputs of this function should only be int, float, str, unicode, buffer, or None
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ccreate_aggregate(name, num_params, aggregate_class)
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Creates a user-defined aggregation function for use in SQL statements name is a string containing the name of the function, and num_params is an integer giving the number of input parameters aggregate_class is a class that implements the aggregation operation This class must support initialization with no arguments and implements a step(params) method that accepts the same number of parameters as given in num_params and a finalize() method that returns the final result Here is a simple example:
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class Averager(object): def _ _init_ _(self): selftotal = 00 selfcount = 0
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def step(self,value): selftotal += value selfcount += 1 def finalize(self): return selftotal / selfcount ccreate_aggregate("myavg",1,Averager) # Sample use in a query cexecute("select myavg(num) from sometable")
Aggregation works by making repeated calls to the step() method with input values and then calling finalize() to obtain the final value
ccreate_collation(name, func)
Registers a user-defined collation function for use in SQL statements name is a string containing the name of the collation function, and func is a function that accepts two inputs and returns -1, 0, 1 depending on whether or not the first input is below, equal to, or above the second inputYou use the user-defined function using a SQL expression such as "select * from table order by colname collate name"
cexecute(sql [, params])
A shortcut method that creates a cursor object using ccursor() and executes the cursor s execute() method with SQL statements in sql with the parameters in params
cexecutemany(sql [, params])
A shortcut method that creates a cursor object using ccursor() and executes the cursor s executemany() method with SQL statements in sql with the parameters in params
cexecutescript(sql)
A shortcut method that creates a cursor object using ccursor() and executes the cursor s executescript() method with SQL statements in sql
cinterrupt()
Aborts any currently executing queries on the connectionThis is meant to be called from a separate thread
citerdump()
Returns an iterator that dumps the entire database contents to a series of SQL statements that could be executed to recreate the databaseThis could be useful if exporting the database elsewhere or if you need to dump the contents of an in-memory database to a file for later restoration
cset_authorizer(auth_callback)
Registers an authorization callback function that gets executed on every access to a column of data in the databaseThe callback function must take five arguments as auth_callback(code, arg1, arg2, dbname, innername)The value returned by this callback is one of SQLITE_OK if access is allowed, SQLITE_DENY if the SQL statement should fail with an error, or SQLITE_IGNORE if the column should be ignored by treating it as a Null valueThe first argument code is an integer action code arg1 and