[top] / zope / rdb / interfaces / IDBICursor
DB API ICursor interface
description
(Attribute)
This read-only attribute is a sequence of 7-item sequences. Each of these sequences contains information describing one result column: (name, type_code, display_size, internal_size, precision, scale, null_ok). This attribute will be None for operations that do not return rows or if the cursor has not had an operation invoked via the executeZZZ() method yet.
The type_code can be interpreted by comparing it to the Type Objects specified in the section below.
arraysize
(Attribute)
This read/write attribute specifies the number of rows to fetch at a time with fetchmany(). It defaults to 1 meaning to fetch a single row at a time.
Implementations must observe this value with respect to the fetchmany() method, but are free to interact with the database a single row at a time. It may also be used in the implementation of executemany().
* = required
fetchall()
Fetch all (remaining) rows of a query result, returning them as a sequence of sequences (e.g. a list of tuples). Note that the cursor's arraysize attribute can affect the performance of this operation.
An Error (or subclass) exception is raised if the previous call to executeZZZ() did not produce any result set or no call was issued yet.
execute(operation, parameters=None)
Prepare and execute a database operation (query or command). Parameters may be provided as sequence or mapping and will be bound to variables in the operation. Variables are specified in a database-specific notation (see the module's paramstyle attribute for details). [5]
A reference to the operation will be retained by the cursor. If the same operation object is passed in again, then the cursor can optimize its behavior. This is most effective for algorithms where the same operation is used, but different parameters are bound to it (many times).
For maximum efficiency when reusing an operation, it is best to use the setinputsizes() method to specify the parameter types and sizes ahead of time. It is legal for a parameter to not match the predefined information; the implementation should compensate, possibly with a loss of efficiency.
The parameters may also be specified as list of tuples to e.g. insert multiple rows in a single operation, but this kind of usage is depreciated: executemany() should be used instead.
Return values are not defined.
executemany(operation, seq_of_parameters)
Prepare a database operation (query or command) and then execute it against all parameter sequences or mappings found in the sequence seq_of_parameters.
Modules are free to implement this method using multiple calls to the execute() method or by using array operations to have the database process the sequence as a whole in one call.
The same comments as for execute() also apply accordingly to this method.
Return values are not defined.
fetchone()
Fetch the next row of a query result set, returning a single sequence, or None when no more data is available. [6]
An Error (or subclass) exception is raised if the previous call to executeZZZ() did not produce any result set or no call was issued yet.
close()
Close the cursor now (rather than whenever __del__ is called). The cursor will be unusable from this point forward; an Error (or subclass) exception will be raised if any operation is attempted with the cursor.
fetchmany(size=<zope.interface.interface.Attribute object at 0x40e4a66c>)
Fetch the next set of rows of a query result, returning a sequence of sequences (e.g. a list of tuples). An empty sequence is returned when no more rows are available.
The number of rows to fetch per call is specified by the parameter. If it is not given, the cursor's arraysize determines the number of rows to be fetched. The method should try to fetch as many rows as indicated by the size parameter. If this is not possible due to the specified number of rows not being available, fewer rows may be returned.
An Error (or subclass) exception is raised if the previous call to executeZZZ() did not produce any result set or no call was issued yet.
Note there are performance considerations involved with the size parameter. For optimal performance, it is usually best to use the arraysize attribute. If the size parameter is used, then it is best for it to retain the same value from one fetchmany() call to the next.
There are no specific adapters registered for this interface.
There are no extended adapters registered for this interface.
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