com.ziclix.python.sql
Class PyCursor

java.lang.Object
  extended by org.python.core.PyObject
      extended by com.ziclix.python.sql.PyCursor
All Implemented Interfaces:
WarningListener, Serializable, ClassDictInit, ContextManager
Direct Known Subclasses:
PyExtendedCursor

public class PyCursor
extends PyObject
implements ClassDictInit, WarningListener, ContextManager

These objects represent a database cursor, which is used to manage the context of a fetch operation.

Version:
$Revision: 6784 $
Author:
brian zimmer, last revised by $Author: zyasoft $
See Also:
Serialized Form

Nested Class Summary
 
Nested classes/interfaces inherited from class org.python.core.PyObject
PyObject.ConversionException
 
Field Summary
 
Fields inherited from class org.python.core.PyObject
TYPE
 
Method Summary
 void __del__()
          Delete the cursor.
 PyObject __enter__()
           
 PyObject __enter__(ThreadState ts)
           
 boolean __exit__(PyObject type, PyObject value, PyObject traceback)
           
 boolean __exit__(ThreadState ts, PyException exception)
           
 PyObject __findattr_ex__(String name)
          Gets the value of the attribute name.
 PyObject __iter__()
          Returns an iteratable object.
 PyObject __iternext__()
          Return the next element of the sequence that this is an iterator for.
 void __setattr__(String name, PyObject value)
          Sets the attribute name to value.
 void callproc(PyObject name, PyObject params, PyObject bindings, PyObject maxRows)
          This method is optional since not all databases provide stored procedures.
static void classDictInit(PyObject dict)
          Initializes the object's namespace.
 void close()
          Close the cursor now (rather than whenever __del__ is called).
 void execute(PyObject sql, PyObject params, PyObject bindings, PyObject maxRows)
          Prepare and execute a database operation (query or command).
 void executemany(PyObject sql, PyObject params, PyObject bindings, PyObject maxRows)
          Prepare a database operation (query or command) and then execute it against all parameter sequences or mappings found in the sequence seq_of_parameters.
 PyObject fetchall()
          Fetch all (remaining) rows of a query result, returning them as a sequence of sequences (e.g. a list of tuples).
 PyObject fetchmany(int size)
          Fetch the next set of rows of a query result, returning a sequence of sequences (e.g. a list of tuples).
 PyObject fetchone()
          Fetch the next row of a query result set, returning a single sequence, or None when no more data is available.
 DataHandler getDataHandler()
          Return the currently bound DataHandler.
static boolean hasParams(PyObject params)
          Method hasParams
static boolean isSeq(PyObject object)
          Method isSeq
static boolean isSeqSeq(PyObject object)
          Method isSeqSeq
 PyObject next()
          Returns the next row from the currently executing SQL statement using the same semantics as .fetchone().
 PyObject nextset()
          Move the result pointer to the next set if available.
 PyStatement prepare(PyObject sql)
          Prepare a sql statement for later execution.
 void scroll(int value, String mode)
          Scroll the cursor in the result set to a new position according to mode.
 String toString()
          String representation of the object.
 void warning(WarningEvent event)
          Adds a warning to the tuple and will follow the chain as necessary.
 
Methods inherited from class org.python.core.PyObject
__abs__, __add__, __and__, __call__, __call__, __call__, __call__, __call__, __call__, __call__, __call__, __call__, __call__, __call__, __call__, __call__, __call__, __call__, __call__, __cmp__, __coerce__, __coerce_ex__, __complex__, __contains__, __delattr__, __delattr__, __delete__, __delitem__, __delitem__, __delslice__, __delslice__, __dir__, __div__, __divmod__, __eq__, __findattr__, __findattr__, __finditem__, __finditem__, __finditem__, __float__, __floordiv__, __ge__, __get__, __getattr__, __getattr__, __getitem__, __getitem__, __getnewargs__, __getslice__, __getslice__, __gt__, __hash__, __hex__, __iadd__, __iand__, __idiv__, __idivmod__, __ifloordiv__, __ilshift__, __imod__, __imul__, __index__, __int__, __invert__, __ior__, __ipow__, __irshift__, __isub__, __itruediv__, __ixor__, __le__, __len__, __long__, __lshift__, __lt__, __mod__, __mul__, __ne__, __neg__, __nonzero__, __not__, __oct__, __or__, __pos__, __pow__, __pow__, __radd__, __rand__, __rdiv__, __rdivmod__, __reduce__, __reduce_ex__, __reduce_ex__, __repr__, __rfloordiv__, __rlshift__, __rmod__, __rmul__, __ror__, __rpow__, __rrshift__, __rshift__, __rsub__, __rtruediv__, __rxor__, __set__, __setattr__, __setitem__, __setitem__, __setitem__, __setslice__, __setslice__, __str__, __sub__, __tojava__, __truediv__, __unicode__, __xor__, _add, _and, _callextra, _cmp, _div, _divmod, _doget, _doget, _doset, _eq, _floordiv, _ge, _gt, _iadd, _iand, _idiv, _idivmod, _ifloordiv, _ilshift, _imod, _imul, _in, _ior, _ipow, _irshift, _is, _isnot, _isub, _itruediv, _ixor, _jcall, _jcallexc, _jthrow, _le, _lshift, _lt, _mod, _mul, _ne, _notin, _or, _pow, _rshift, _sub, _truediv, _xor, asDouble, asIndex, asIndex, asInt, asInt, asIterable, asLong, asLong, asName, asName, asString, asString, asStringOrNull, asStringOrNull, delDict, delType, dispatch__init__, equals, fastGetClass, fastGetDict, getDict, getType, hashCode, implementsDescrDelete, implementsDescrSet, invoke, invoke, invoke, invoke, invoke, invoke, isCallable, isDataDescr, isIndex, isMappingType, isNumberType, isSequenceType, noAttributeError, readonlyAttributeError, setDict, setType
 
Methods inherited from class java.lang.Object
getClass, notify, notifyAll, wait, wait, wait
 

Method Detail

toString

public String toString()
String representation of the object.

Overrides:
toString in class PyObject
Returns:
a string representation of the object.

__setattr__

public void __setattr__(String name,
                        PyObject value)
Sets the attribute name to value.

Overrides:
__setattr__ in class PyObject
Parameters:
name -
value -
See Also:
PyObject.__setattr__(PyString, PyObject)

__findattr_ex__

public PyObject __findattr_ex__(String name)
Gets the value of the attribute name.

Overrides:
__findattr_ex__ in class PyObject
Parameters:
name -
Returns:
the attribute for the given name

classDictInit

public static void classDictInit(PyObject dict)
Initializes the object's namespace.

Parameters:
dict -

__del__

public void __del__()
Delete the cursor.


close

public void 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.


__iter__

public PyObject __iter__()
Returns an iteratable object.

Overrides:
__iter__ in class PyObject
Returns:
PyObject
Since:
Jython 2.2, DB API 2.0+

next

public PyObject next()
Returns the next row from the currently executing SQL statement using the same semantics as .fetchone(). A StopIteration exception is raised when the result set is exhausted for Python versions 2.2 and later.

Returns:
PyObject
Since:
Jython 2.2, DB API 2.0+

__iternext__

public PyObject __iternext__()
Return the next element of the sequence that this is an iterator for. Returns null when the end of the sequence is reached.

Overrides:
__iternext__ in class PyObject
Returns:
PyObject
Since:
Jython 2.2

getDataHandler

public DataHandler getDataHandler()
Return the currently bound DataHandler.

Returns:
DataHandler

callproc

public void callproc(PyObject name,
                     PyObject params,
                     PyObject bindings,
                     PyObject maxRows)
This method is optional since not all databases provide stored procedures. Call a stored database procedure with the given name. The sequence of parameters must contain one entry for each argument that the procedure expects. The result of the call is returned as modified copy of the input sequence. Input parameters are left untouched, output and input/output parameters replaced with possibly new values. The procedure may also provide a result set as output. This must then be made available through the standard fetchXXX() methods.

Parameters:
name -
params -
bindings -
maxRows -

executemany

public void executemany(PyObject sql,
                        PyObject params,
                        PyObject bindings,
                        PyObject maxRows)
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.

Parameters:
sql -
params -
bindings -
maxRows -

execute

public void execute(PyObject sql,
                    PyObject params,
                    PyObject bindings,
                    PyObject maxRows)
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). 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 deprecated: executemany() should be used instead. Return values are not defined.

Parameters:
sql - sql string or prepared statement
params - params for a prepared statement
bindings - dictionary of (param index : SQLType binding)
maxRows - integer value of max rows

fetchone

public PyObject fetchone()
Fetch the next row of a query result set, returning a single sequence, or None when no more data is available. An Error (or subclass) exception is raised if the previous call to executeXXX() did not produce any result set or no call was issued yet.

Returns:
a single sequence from the result set, or None when no more data is available

fetchall

public PyObject 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 executeXXX() did not produce any result set or no call was issued yet.

Returns:
a sequence of sequences from the result set, or an empty sequence when no more data is available

fetchmany

public PyObject fetchmany(int size)
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 executeXXX() 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.

Parameters:
size -
Returns:
a sequence of sequences from the result set, or an empty sequence when no more data is available

nextset

public PyObject nextset()
Move the result pointer to the next set if available.

Returns:
true if more sets exist, else None

prepare

public PyStatement prepare(PyObject sql)
Prepare a sql statement for later execution.

Parameters:
sql - The sql string to be prepared.
Returns:
A prepared statement usable with .executeXXX()

scroll

public void scroll(int value,
                   String mode)
Scroll the cursor in the result set to a new position according to mode. If mode is 'relative' (default), value is taken as offset to the current position in the result set, if set to 'absolute', value states an absolute target position. An IndexError should be raised in case a scroll operation would leave the result set. In this case, the cursor position is left undefined (ideal would be to not move the cursor at all). Note: This method should use native scrollable cursors, if available, or revert to an emulation for forward-only scrollable cursors. The method may raise NotSupportedErrors to signal that a specific operation is not supported by the database (e.g. backward scrolling).

Parameters:
value -
mode -

warning

public void warning(WarningEvent event)
Adds a warning to the tuple and will follow the chain as necessary.

Specified by:
warning in interface WarningListener
Parameters:
event -

isSeq

public static boolean isSeq(PyObject object)
Method isSeq

Parameters:
object -
Returns:
true for any PyList, PyTuple or java.util.List

hasParams

public static boolean hasParams(PyObject params)
Method hasParams

Parameters:
params -
Returns:
boolean

isSeqSeq

public static boolean isSeqSeq(PyObject object)
Method isSeqSeq

Parameters:
object -
Returns:
true is a sequence of sequences

__enter__

public PyObject __enter__(ThreadState ts)
Specified by:
__enter__ in interface ContextManager

__enter__

public PyObject __enter__()

__exit__

public boolean __exit__(ThreadState ts,
                        PyException exception)
Specified by:
__exit__ in interface ContextManager

__exit__

public boolean __exit__(PyObject type,
                        PyObject value,
                        PyObject traceback)


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