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//-----------------------------------------------------------------------------
// Copyright (c) 2016, 2019, Oracle and/or its affiliates. All rights reserved.
//
// Portions Copyright 2007-2015, Anthony Tuininga. All rights reserved.
//
// Portions Copyright 2001-2007, Computronix (Canada) Ltd., Edmonton, Alberta,
// Canada. All rights reserved.
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// cxoCursor.c
// Definition of the Python type Cursor.
//-----------------------------------------------------------------------------
#include "cxoModule.h"
//-----------------------------------------------------------------------------
// functions for the Python type "Cursor"
//-----------------------------------------------------------------------------
static void cxoCursor_free(cxoCursor*);
static PyObject *cxoCursor_getIter(cxoCursor*);
static PyObject *cxoCursor_getNext(cxoCursor*);
static PyObject *cxoCursor_close(cxoCursor*, PyObject*);
static PyObject *cxoCursor_callFunc(cxoCursor*, PyObject*, PyObject*);
static PyObject *cxoCursor_callProc(cxoCursor*, PyObject*, PyObject*);
static PyObject *cxoCursor_execute(cxoCursor*, PyObject*, PyObject*);
static PyObject *cxoCursor_executeMany(cxoCursor*, PyObject*, PyObject*);
static PyObject *cxoCursor_executeManyPrepared(cxoCursor*, PyObject*);
static PyObject *cxoCursor_fetchOne(cxoCursor*, PyObject*);
static PyObject *cxoCursor_fetchMany(cxoCursor*, PyObject*, PyObject*);
static PyObject *cxoCursor_fetchAll(cxoCursor*, PyObject*);
static PyObject *cxoCursor_fetchRaw(cxoCursor*, PyObject*, PyObject*);
static PyObject *cxoCursor_parse(cxoCursor*, PyObject*);
static PyObject *cxoCursor_prepare(cxoCursor*, PyObject*);
static PyObject *cxoCursor_scroll(cxoCursor*, PyObject*, PyObject*);
static PyObject *cxoCursor_setInputSizes(cxoCursor*, PyObject*, PyObject*);
static PyObject *cxoCursor_setOutputSize(cxoCursor*, PyObject*);
static PyObject *cxoCursor_var(cxoCursor*, PyObject*, PyObject*);
static PyObject *cxoCursor_arrayVar(cxoCursor*, PyObject*);
static PyObject *cxoCursor_bindNames(cxoCursor*, PyObject*);
static PyObject *cxoCursor_getDescription(cxoCursor*, void*);
static PyObject *cxoCursor_new(PyTypeObject*, PyObject*, PyObject*);
static int cxoCursor_init(cxoCursor*, PyObject*, PyObject*);
static PyObject *cxoCursor_repr(cxoCursor*);
static PyObject* cxoCursor_getBatchErrors(cxoCursor*);
static PyObject *cxoCursor_getArrayDMLRowCounts(cxoCursor*);
static PyObject *cxoCursor_getImplicitResults(cxoCursor*);
static PyObject *cxoCursor_contextManagerEnter(cxoCursor*, PyObject*);
static PyObject *cxoCursor_contextManagerExit(cxoCursor*, PyObject*);
static int cxoCursor_performDefine(cxoCursor*, uint32_t);
//-----------------------------------------------------------------------------
// declaration of methods for Python type "Cursor"
//-----------------------------------------------------------------------------
static PyMethodDef cxoCursorMethods[] = {
{ "execute", (PyCFunction) cxoCursor_execute,
METH_VARARGS | METH_KEYWORDS },
{ "fetchall", (PyCFunction) cxoCursor_fetchAll, METH_NOARGS },
{ "fetchone", (PyCFunction) cxoCursor_fetchOne, METH_NOARGS },
{ "fetchmany", (PyCFunction) cxoCursor_fetchMany,
METH_VARARGS | METH_KEYWORDS },
{ "fetchraw", (PyCFunction) cxoCursor_fetchRaw,
METH_VARARGS | METH_KEYWORDS },
{ "prepare", (PyCFunction) cxoCursor_prepare, METH_VARARGS },
{ "parse", (PyCFunction) cxoCursor_parse, METH_O },
{ "setinputsizes", (PyCFunction) cxoCursor_setInputSizes,
METH_VARARGS | METH_KEYWORDS },
{ "executemany", (PyCFunction) cxoCursor_executeMany,
METH_VARARGS | METH_KEYWORDS },
{ "callproc", (PyCFunction) cxoCursor_callProc,
METH_VARARGS | METH_KEYWORDS },
{ "callfunc", (PyCFunction) cxoCursor_callFunc,
METH_VARARGS | METH_KEYWORDS },
{ "executemanyprepared", (PyCFunction) cxoCursor_executeManyPrepared,
METH_VARARGS },
{ "setoutputsize", (PyCFunction) cxoCursor_setOutputSize, METH_VARARGS },
{ "scroll", (PyCFunction) cxoCursor_scroll, METH_VARARGS | METH_KEYWORDS },
{ "var", (PyCFunction) cxoCursor_var, METH_VARARGS | METH_KEYWORDS },
{ "arrayvar", (PyCFunction) cxoCursor_arrayVar, METH_VARARGS },
{ "bindnames", (PyCFunction) cxoCursor_bindNames, METH_NOARGS },
{ "close", (PyCFunction) cxoCursor_close, METH_NOARGS },
{ "getbatcherrors", (PyCFunction) cxoCursor_getBatchErrors, METH_NOARGS },
{ "getarraydmlrowcounts", (PyCFunction) cxoCursor_getArrayDMLRowCounts,
METH_NOARGS },
{ "getimplicitresults", (PyCFunction) cxoCursor_getImplicitResults,
METH_NOARGS },
{ "__enter__", (PyCFunction) cxoCursor_contextManagerEnter, METH_NOARGS },
{ "__exit__", (PyCFunction) cxoCursor_contextManagerExit, METH_VARARGS },
{ NULL, NULL }
};
//-----------------------------------------------------------------------------
// declaration of members for Python type "Cursor"
//-----------------------------------------------------------------------------
static PyMemberDef cxoCursorMembers[] = {
{ "arraysize", T_UINT, offsetof(cxoCursor, arraySize), 0 },
{ "bindarraysize", T_UINT, offsetof(cxoCursor, bindArraySize), 0 },
{ "rowcount", T_ULONGLONG, offsetof(cxoCursor, rowCount), READONLY },
{ "statement", T_OBJECT, offsetof(cxoCursor, statement), READONLY },
{ "connection", T_OBJECT_EX, offsetof(cxoCursor, connection), READONLY },
{ "rowfactory", T_OBJECT, offsetof(cxoCursor, rowFactory), 0 },
{ "bindvars", T_OBJECT, offsetof(cxoCursor, bindVariables), READONLY },
{ "fetchvars", T_OBJECT, offsetof(cxoCursor, fetchVariables), READONLY },
{ "inputtypehandler", T_OBJECT, offsetof(cxoCursor, inputTypeHandler),
0 },
{ "outputtypehandler", T_OBJECT, offsetof(cxoCursor, outputTypeHandler),
0 },
{ "scrollable", T_BOOL, offsetof(cxoCursor, isScrollable), 0 },
{ NULL }
};
//-----------------------------------------------------------------------------
// declaration of calculated members for Python type "Connection"
//-----------------------------------------------------------------------------
static PyGetSetDef cxoCursorCalcMembers[] = {
{ "description", (getter) cxoCursor_getDescription, 0, 0, 0 },
{ NULL }
};
//-----------------------------------------------------------------------------
// declaration of Python type "Cursor"
//-----------------------------------------------------------------------------
PyTypeObject cxoPyTypeCursor = {
PyVarObject_HEAD_INIT(NULL, 0)
"cx_Oracle.Cursor", // tp_name
sizeof(cxoCursor), // tp_basicsize
0, // tp_itemsize
(destructor) cxoCursor_free, // tp_dealloc
0, // tp_print
0, // tp_getattr
0, // tp_setattr
0, // tp_compare
(reprfunc) cxoCursor_repr, // tp_repr
0, // tp_as_number
0, // tp_as_sequence
0, // tp_as_mapping
0, // tp_hash
0, // tp_call
0, // tp_str
0, // tp_getattro
0, // tp_setattro
0, // tp_as_buffer
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE,
// tp_flags
0, // tp_doc
0, // tp_traverse
0, // tp_clear
0, // tp_richcompare
0, // tp_weaklistoffset
(getiterfunc) cxoCursor_getIter, // tp_iter
(iternextfunc) cxoCursor_getNext, // tp_iternext
cxoCursorMethods, // tp_methods
cxoCursorMembers, // tp_members
cxoCursorCalcMembers, // tp_getset
0, // tp_base
0, // tp_dict
0, // tp_descr_get
0, // tp_descr_set
0, // tp_dictoffset
(initproc) cxoCursor_init, // tp_init
0, // tp_alloc
cxoCursor_new, // tp_new
0, // tp_free
0, // tp_is_gc
0 // tp_bases
};
//-----------------------------------------------------------------------------
// cxoCursor_new()
// Create a new cursor object.
//-----------------------------------------------------------------------------
static PyObject *cxoCursor_new(PyTypeObject *type, PyObject *args,
PyObject *keywordArgs)
{
return type->tp_alloc(type, 0);
}
//-----------------------------------------------------------------------------
// cxoCursor_init()
// Create a new cursor object.
//-----------------------------------------------------------------------------
static int cxoCursor_init(cxoCursor *cursor, PyObject *args,
PyObject *keywordArgs)
{
static char *keywordList[] = { "connection", "scrollable", NULL };
cxoConnection *connection;
PyObject *scrollableObj;
// parse arguments
scrollableObj = NULL;
if (!PyArg_ParseTupleAndKeywords(args, keywordArgs, "O!|O", keywordList,
&cxoPyTypeConnection, &connection, &scrollableObj))
return -1;
if (cxoUtils_getBooleanValue(scrollableObj, 0, &cursor->isScrollable) < 0)
return -1;
// initialize members
Py_INCREF(connection);
cursor->connection = connection;
cursor->arraySize = 100;
cursor->fetchArraySize = 100;
cursor->bindArraySize = 1;
cursor->isOpen = 1;
return 0;
}
//-----------------------------------------------------------------------------
// cxoCursor_repr()
// Return a string representation of the cursor.
//-----------------------------------------------------------------------------
static PyObject *cxoCursor_repr(cxoCursor *cursor)
{
PyObject *connectionRepr, *module, *name, *result;
connectionRepr = PyObject_Repr((PyObject*) cursor->connection);
if (!connectionRepr)
return NULL;
if (cxoUtils_getModuleAndName(Py_TYPE(cursor), &module, &name) < 0) {
Py_DECREF(connectionRepr);
return NULL;
}
result = cxoUtils_formatString("<%s.%s on %s>",
PyTuple_Pack(3, module, name, connectionRepr));
Py_DECREF(module);
Py_DECREF(name);
Py_DECREF(connectionRepr);
return result;
}
//-----------------------------------------------------------------------------
// cxoCursor_free()
// Deallocate the cursor.
//-----------------------------------------------------------------------------
static void cxoCursor_free(cxoCursor *cursor)
{
Py_CLEAR(cursor->statement);
Py_CLEAR(cursor->statementTag);
Py_CLEAR(cursor->bindVariables);
Py_CLEAR(cursor->fetchVariables);
if (cursor->handle) {
dpiStmt_release(cursor->handle);
cursor->handle = NULL;
}
Py_CLEAR(cursor->connection);
Py_CLEAR(cursor->rowFactory);
Py_CLEAR(cursor->inputTypeHandler);
Py_CLEAR(cursor->outputTypeHandler);
Py_TYPE(cursor)->tp_free((PyObject*) cursor);
}
//-----------------------------------------------------------------------------
// cxoCursor_isOpen()
// Determines if the cursor object is open. Since the same cursor can be
// used to execute multiple statements, simply checking for the DPI statement
// handle is insufficient.
//-----------------------------------------------------------------------------
static int cxoCursor_isOpen(cxoCursor *cursor)
{
if (!cursor->isOpen) {
cxoError_raiseFromString(cxoInterfaceErrorException, "not open");
return -1;
}
return cxoConnection_isConnected(cursor->connection);
}
//-----------------------------------------------------------------------------
// cxoCursor_verifyFetch()
// Verify that fetching may happen from this cursor.
//-----------------------------------------------------------------------------
static int cxoCursor_verifyFetch(cxoCursor *cursor)
{
uint32_t numQueryColumns;
// make sure the cursor is open
if (cxoCursor_isOpen(cursor) < 0)
return -1;
// fixup REF cursor, if applicable
if (cursor->fixupRefCursor) {
cursor->fetchArraySize = cursor->arraySize;
if (dpiStmt_setFetchArraySize(cursor->handle,
cursor->fetchArraySize) < 0)
return cxoError_raiseAndReturnInt();
if (dpiStmt_getNumQueryColumns(cursor->handle, &numQueryColumns) < 0)
return cxoError_raiseAndReturnInt();
if (cxoCursor_performDefine(cursor, numQueryColumns) < 0)
return cxoError_raiseAndReturnInt();
cursor->fixupRefCursor = 0;
}
// make sure the cursor is for a query
if (!cursor->fetchVariables) {
cxoError_raiseFromString(cxoInterfaceErrorException, "not a query");
return -1;
}
return 0;
}
//-----------------------------------------------------------------------------
// cxoCursor_fetchRow()
// Fetch a single row from the cursor. Internally the number of rows left in
// the buffer is managed in order to minimize calls to Py_BEGIN_ALLOW_THREADS
// and Py_END_ALLOW_THREADS which have a significant overhead.
//-----------------------------------------------------------------------------
static int cxoCursor_fetchRow(cxoCursor *cursor, int *found,
uint32_t *bufferRowIndex)
{
int status;
// if the number of rows in the fetch buffer is zero and there are more
// rows to fetch, call DPI with threading enabled in order to perform any
// fetch requiring a network round trip
if (cursor->numRowsInFetchBuffer == 0 && cursor->moreRowsToFetch) {
Py_BEGIN_ALLOW_THREADS
status = dpiStmt_fetchRows(cursor->handle, cursor->fetchArraySize,
&cursor->fetchBufferRowIndex, &cursor->numRowsInFetchBuffer,
&cursor->moreRowsToFetch);
Py_END_ALLOW_THREADS
if (status < 0)
return cxoError_raiseAndReturnInt();
}
// keep track of where we are in the fetch buffer
if (cursor->numRowsInFetchBuffer == 0)
*found = 0;
else {
*found = 1;
*bufferRowIndex = cursor->fetchBufferRowIndex++;
cursor->numRowsInFetchBuffer--;
}
return 0;
}
//-----------------------------------------------------------------------------
// cxoCursor_performDefine()
// Perform the defines for the cursor. At this point it is assumed that the
// statement being executed is in fact a query.
//-----------------------------------------------------------------------------
static int cxoCursor_performDefine(cxoCursor *cursor, uint32_t numQueryColumns)
{
PyObject *outputTypeHandler, *result;
cxoObjectType *objectType;
cxoVarType *varType;
dpiQueryInfo queryInfo;
uint32_t pos, size;
cxoVar *var;
// initialize fetching variables; these are used to reduce the number of
// times that Py_BEGIN_ALLOW_THREADS/Py_END_ALLOW_THREADS is called as
// there is a significant amount of overhead in making these calls
cursor->numRowsInFetchBuffer = 0;
cursor->moreRowsToFetch = 1;
// if fetch variables already exist, nothing more to do (we are executing
// the same statement and therefore all defines have already been
// performed)
if (cursor->fetchVariables)
return 0;
// create a list corresponding to the number of items
cursor->fetchVariables = PyList_New(numQueryColumns);
if (!cursor->fetchVariables)
return -1;
// create a variable for each of the query columns
cursor->fetchArraySize = cursor->arraySize;
for (pos = 1; pos <= numQueryColumns; pos++) {
// get query information for the column position
if (dpiStmt_getQueryInfo(cursor->handle, pos, &queryInfo) < 0)
return cxoError_raiseAndReturnInt();
if (queryInfo.typeInfo.sizeInChars)
size = queryInfo.typeInfo.sizeInChars;
else size = queryInfo.typeInfo.clientSizeInBytes;
// determine object type, if applicable
objectType = NULL;
if (queryInfo.typeInfo.objectType) {
objectType = cxoObjectType_new(cursor->connection,
queryInfo.typeInfo.objectType);
if (!objectType)
return -1;
}
// determine the default type
varType = cxoVarType_fromDataTypeInfo(&queryInfo.typeInfo);
if (!varType)
return -1;
// see if an output type handler should be used
var = NULL;
outputTypeHandler = NULL;
if (cursor->outputTypeHandler && cursor->outputTypeHandler != Py_None)
outputTypeHandler = cursor->outputTypeHandler;
else if (cursor->connection->outputTypeHandler &&
cursor->connection->outputTypeHandler != Py_None)
outputTypeHandler = cursor->connection->outputTypeHandler;
// if using an output type handler, None implies default behavior
if (outputTypeHandler) {
result = PyObject_CallFunction(outputTypeHandler, "Os#Oiii",
cursor, queryInfo.name, queryInfo.nameLength,
varType->pythonType, size, queryInfo.typeInfo.precision,
queryInfo.typeInfo.scale);
if (!result) {
Py_XDECREF(objectType);
return -1;
} else if (result == Py_None)
Py_DECREF(result);
else if (!cxoVar_check(result)) {
Py_DECREF(result);
Py_XDECREF(objectType);
PyErr_SetString(PyExc_TypeError,
"expecting variable from output type handler");
return -1;
} else {
var = (cxoVar*) result;
if (var->allocatedElements < cursor->fetchArraySize) {
Py_DECREF(result);
Py_XDECREF(objectType);
PyErr_SetString(PyExc_TypeError,
"expecting variable with array size large "
"enough for fetch");
return -1;
}
}
}
// if no variable created yet, use the database metadata
if (!var) {
var = cxoVar_new(cursor, cursor->fetchArraySize, varType, size, 0,
objectType);
if (!var) {
Py_XDECREF(objectType);
return -1;
}
}
// add the variable to the fetch variables and perform define
Py_XDECREF(objectType);
PyList_SET_ITEM(cursor->fetchVariables, pos - 1, (PyObject *) var);
if (dpiStmt_define(cursor->handle, pos, var->handle) < 0)
return cxoError_raiseAndReturnInt();
}
return 0;
}
//-----------------------------------------------------------------------------
// cxoCursor_itemDescription()
// Return a tuple describing the item at the given position.
//-----------------------------------------------------------------------------
static PyObject *cxoCursor_itemDescription(cxoCursor *cursor, uint32_t pos)
{
cxoVarType *varType;
int displaySize, index;
dpiQueryInfo queryInfo;
PyObject *tuple, *temp;
// get information about the column position
if (dpiStmt_getQueryInfo(cursor->handle, pos, &queryInfo) < 0)
return NULL;
varType = cxoVarType_fromDataTypeInfo(&queryInfo.typeInfo);
if (!varType)
return NULL;
// set display size based on data type
switch (queryInfo.typeInfo.oracleTypeNum) {
case DPI_ORACLE_TYPE_VARCHAR:
case DPI_ORACLE_TYPE_NVARCHAR:
case DPI_ORACLE_TYPE_CHAR:
case DPI_ORACLE_TYPE_NCHAR:
case DPI_ORACLE_TYPE_ROWID:
displaySize = (int) queryInfo.typeInfo.sizeInChars;
break;
case DPI_ORACLE_TYPE_RAW:
displaySize = (int) queryInfo.typeInfo.clientSizeInBytes;
break;
case DPI_ORACLE_TYPE_NATIVE_FLOAT:
case DPI_ORACLE_TYPE_NATIVE_DOUBLE:
case DPI_ORACLE_TYPE_NATIVE_INT:
case DPI_ORACLE_TYPE_NUMBER:
if (queryInfo.typeInfo.precision) {
displaySize = queryInfo.typeInfo.precision + 1;
if (queryInfo.typeInfo.scale > 0)
displaySize += queryInfo.typeInfo.scale + 1;
}
else displaySize = 127;
break;
case DPI_ORACLE_TYPE_DATE:
case DPI_ORACLE_TYPE_TIMESTAMP:
displaySize = 23;
break;
default:
displaySize = 0;
}
// create the tuple and populate it
tuple = PyTuple_New(7);
if (!tuple)
return NULL;
// set each of the items in the tuple
PyTuple_SET_ITEM(tuple, 0, cxoPyString_fromEncodedString(queryInfo.name,
queryInfo.nameLength, cursor->connection->encodingInfo.encoding,
NULL));
Py_INCREF(varType->pythonType);
PyTuple_SET_ITEM(tuple, 1, (PyObject*) varType->pythonType);
if (displaySize)
PyTuple_SET_ITEM(tuple, 2, PyInt_FromLong(displaySize));
else {
Py_INCREF(Py_None);
PyTuple_SET_ITEM(tuple, 2, Py_None);
}
if (queryInfo.typeInfo.clientSizeInBytes)
PyTuple_SET_ITEM(tuple, 3,
PyInt_FromLong(queryInfo.typeInfo.clientSizeInBytes));
else {
Py_INCREF(Py_None);
PyTuple_SET_ITEM(tuple, 3, Py_None);
}
if (queryInfo.typeInfo.precision || queryInfo.typeInfo.scale ||
queryInfo.typeInfo.fsPrecision) {
PyTuple_SET_ITEM(tuple, 4,
PyInt_FromLong(queryInfo.typeInfo.precision));
PyTuple_SET_ITEM(tuple, 5,
PyInt_FromLong(queryInfo.typeInfo.scale +
queryInfo.typeInfo.fsPrecision));
} else {
Py_INCREF(Py_None);
PyTuple_SET_ITEM(tuple, 4, Py_None);
Py_INCREF(Py_None);
PyTuple_SET_ITEM(tuple, 5, Py_None);
}
PyTuple_SET_ITEM(tuple, 6, PyInt_FromLong(queryInfo.nullOk != 0));
// make sure the tuple is ok
for (index = 0; index < 7; index++) {
temp = PyTuple_GET_ITEM(tuple, index);
if (!temp) {
Py_DECREF(tuple);
return NULL;
} else if (temp == Py_None)
Py_INCREF(temp);
}
return tuple;
}
//-----------------------------------------------------------------------------
// cxoCursor_getDescription()
// Return a list of 7-tuples consisting of the description of the define
// variables.
//-----------------------------------------------------------------------------
static PyObject *cxoCursor_getDescription(cxoCursor *cursor, void *unused)
{
uint32_t numQueryColumns, i;
PyObject *results, *tuple;
// make sure the cursor is open
if (cxoCursor_isOpen(cursor) < 0)
return NULL;
// determine the number of query columns; if not a query return None
if (!cursor->handle)
Py_RETURN_NONE;
if (dpiStmt_getNumQueryColumns(cursor->handle, &numQueryColumns) < 0)
return cxoError_raiseAndReturnNull();
if (numQueryColumns == 0)
Py_RETURN_NONE;
// create a list of the required length
results = PyList_New(numQueryColumns);
if (!results)
return NULL;
// create tuples corresponding to the select-items
for (i = 0; i < numQueryColumns; i++) {
tuple = cxoCursor_itemDescription(cursor, i + 1);
if (!tuple) {
Py_DECREF(results);
return NULL;
}
PyList_SET_ITEM(results, i, tuple);
}
return results;
}
//-----------------------------------------------------------------------------
// cxoCursor_close()
// Close the cursor. Any action taken on this cursor from this point forward
// results in an exception being raised.
//-----------------------------------------------------------------------------
static PyObject *cxoCursor_close(cxoCursor *cursor, PyObject *args)
{
if (cxoCursor_isOpen(cursor) < 0)
return NULL;
Py_CLEAR(cursor->bindVariables);
Py_CLEAR(cursor->fetchVariables);
if (cursor->handle) {
if (dpiStmt_close(cursor->handle, NULL, 0) < 0)
return cxoError_raiseAndReturnNull();
dpiStmt_release(cursor->handle);
cursor->handle = NULL;
}
cursor->isOpen = 0;
Py_RETURN_NONE;
}
//-----------------------------------------------------------------------------
// cxoCursor_setBindVariableHelper()
// Helper for setting a bind variable.
//-----------------------------------------------------------------------------
static int cxoCursor_setBindVariableHelper(cxoCursor *cursor,
unsigned numElements, unsigned arrayPos, PyObject *value,
cxoVar *origVar, cxoVar **newVar, int deferTypeAssignment)
{
cxoVar *varToSet;
int isValueVar;
// initialization
*newVar = NULL;
isValueVar = cxoVar_check(value);
// handle case where variable is already bound, either from a prior
// execution or a call to setinputsizes()
if (origVar) {
// if the value is a variable object, rebind it if necessary
if (isValueVar) {
if ( (PyObject*) origVar != value) {
Py_INCREF(value);
*newVar = (cxoVar*) value;
}
// otherwise, attempt to set the value, but if this fails, simply
// ignore the original bind variable and create a new one; this is
// intended for cases where the type changes between executions of a
// statement or where setinputsizes() has been called with the wrong
// type (as mandated by the DB API)
} else {
varToSet = origVar;
// first check to see if the variable transform is for None (which
// can happen if all of the values in a previous invocation of
// executemany() were None) and there is now a value; in this case,
// discard the original variable and have a new one created
if (origVar->type->transformNum == CXO_TRANSFORM_NONE &&
value != Py_None) {
origVar = NULL;
varToSet = NULL;
// otherwise, if the number of elements has changed, create a new
// variable this is only necessary for executemany() since
// execute() always passes a value of 1 for the number of elements
} else if (numElements > origVar->allocatedElements) {
*newVar = cxoVar_new(cursor, numElements, origVar->type,
origVar->size, origVar->isArray, origVar->objectType);
if (!*newVar)
return -1;
varToSet = *newVar;
}
// attempt to set the value
if (varToSet && cxoVar_setValue(varToSet, arrayPos, value) < 0) {
// executemany() should simply fail after the first element
if (arrayPos > 0)
return -1;
// clear the exception and try to create a new variable
PyErr_Clear();
Py_CLEAR(*newVar);
origVar = NULL;
}
}
}
// if no original variable used, create a new one
if (!origVar) {
// if the value is a variable object, bind it directly
if (isValueVar) {
Py_INCREF(value);
*newVar = (cxoVar*) value;
// otherwise, create a new variable, unless the value is None and
// we wish to defer type assignment
} else if (value != Py_None || !deferTypeAssignment) {
*newVar = cxoVar_newByValue(cursor, value, numElements);
if (!*newVar)
return -1;
if (cxoVar_setValue(*newVar, arrayPos, value) < 0) {
Py_CLEAR(*newVar);
return -1;
}
}
}
return 0;
}
//-----------------------------------------------------------------------------
// cxoCursor_setBindVariables()
// Create or set bind variables.
//-----------------------------------------------------------------------------
int cxoCursor_setBindVariables(cxoCursor *cursor, PyObject *parameters,
unsigned numElements, unsigned arrayPos, int deferTypeAssignment)
{
uint32_t i, origBoundByPos, origNumParams, boundByPos, numParams;
PyObject *key, *value, *origVar;
cxoVar *newVar;
Py_ssize_t pos, temp;
// make sure positional and named binds are not being intermixed
origNumParams = numParams = 0;
boundByPos = PySequence_Check(parameters);
if (boundByPos) {
temp = PySequence_Size(parameters);
if (temp < 0)
return -1;
numParams = (uint32_t) temp;
}
if (cursor->bindVariables) {
origBoundByPos = PyList_Check(cursor->bindVariables);
if (boundByPos != origBoundByPos) {
cxoError_raiseFromString(cxoProgrammingErrorException,
"positional and named binds cannot be intermixed");
return -1;
}
if (origBoundByPos)
origNumParams = (uint32_t) PyList_GET_SIZE(cursor->bindVariables);
// otherwise, create the list or dictionary if needed
} else {
if (boundByPos)
cursor->bindVariables = PyList_New(numParams);
else cursor->bindVariables = PyDict_New();
if (!cursor->bindVariables)
return -1;
origNumParams = 0;
}
// handle positional binds
if (boundByPos) {
for (i = 0; i < numParams; i++) {
value = PySequence_GetItem(parameters, i);
if (!value)
return -1;
Py_DECREF(value);
if (i < origNumParams) {
origVar = PyList_GET_ITEM(cursor->bindVariables, i);
if (origVar == Py_None)
origVar = NULL;
} else origVar = NULL;
if (cxoCursor_setBindVariableHelper(cursor, numElements, arrayPos,
value, (cxoVar*) origVar, &newVar,
deferTypeAssignment) < 0)
return -1;
if (newVar) {
if (i < (uint32_t) PyList_GET_SIZE(cursor->bindVariables)) {
if (PyList_SetItem(cursor->bindVariables, i,
(PyObject*) newVar) < 0) {
Py_DECREF(newVar);
return -1;
}
} else {
if (PyList_Append(cursor->bindVariables,
(PyObject*) newVar) < 0) {
Py_DECREF(newVar);
return -1;
}
Py_DECREF(newVar);
}
}
}
// handle named binds
} else {
pos = 0;
while (PyDict_Next(parameters, &pos, &key, &value)) {
origVar = PyDict_GetItem(cursor->bindVariables, key);
if (cxoCursor_setBindVariableHelper(cursor, numElements, arrayPos,
value, (cxoVar*) origVar, &newVar,
deferTypeAssignment) < 0)
return -1;
if (newVar) {
if (PyDict_SetItem(cursor->bindVariables, key,
(PyObject*) newVar) < 0) {
Py_DECREF(newVar);
return -1;
}
Py_DECREF(newVar);
}
}
}
return 0;
}
//-----------------------------------------------------------------------------
// cxoCursor_performBind()
// Perform the binds on the cursor.
//-----------------------------------------------------------------------------
int cxoCursor_performBind(cxoCursor *cursor)
{
PyObject *key, *var;
Py_ssize_t pos;
int i;
// ensure that input sizes are reset
// this is done before binding is attempted so that if binding fails and
// a new statement is prepared, the bind variables will be reset and
// spurious errors will not occur
cursor->setInputSizes = 0;
// set values and perform binds for all bind variables
if (cursor->bindVariables) {
if (PyDict_Check(cursor->bindVariables)) {
pos = 0;
while (PyDict_Next(cursor->bindVariables, &pos, &key, &var)) {
if (cxoVar_bind((cxoVar*) var, cursor, key, 0) < 0)
return -1;
}
} else {
for (i = 0; i < PyList_GET_SIZE(cursor->bindVariables); i++) {
var = PyList_GET_ITEM(cursor->bindVariables, i);
if (var != Py_None) {
if (cxoVar_bind((cxoVar*) var, cursor, NULL,
i + 1) < 0)
return -1;
}
}
}
}
return 0;
}
//-----------------------------------------------------------------------------
// cxoCursor_createRow()
// Create an object for the row. The object created is a tuple unless a row
// factory function has been defined in which case it is the result of the
// row factory function called with the argument tuple that would otherwise be
// returned.
//-----------------------------------------------------------------------------
static PyObject *cxoCursor_createRow(cxoCursor *cursor, uint32_t pos)
{
PyObject *tuple, *item, *result;
Py_ssize_t numItems, i;
cxoVar *var;
// bump row count as a new row has been found
cursor->rowCount++;
// create a new tuple
numItems = PyList_GET_SIZE(cursor->fetchVariables);
tuple = PyTuple_New(numItems);
if (!tuple)
return NULL;
// acquire the value for each item
for (i = 0; i < numItems; i++) {
var = (cxoVar*) PyList_GET_ITEM(cursor->fetchVariables, i);
item = cxoVar_getSingleValue(var, var->data, pos);
if (!item) {
Py_DECREF(tuple);
return NULL;
}
PyTuple_SET_ITEM(tuple, i, item);
}
// if a row factory is defined, call it
if (cursor->rowFactory && cursor->rowFactory != Py_None) {
result = PyObject_CallObject(cursor->rowFactory, tuple);
Py_DECREF(tuple);
return result;
}
return tuple;
}
//-----------------------------------------------------------------------------
// cxoCursor_internalPrepare()
// Internal method for preparing a statement for execution.
//-----------------------------------------------------------------------------
static int cxoCursor_internalPrepare(cxoCursor *cursor, PyObject *statement,
PyObject *statementTag)
{
cxoBuffer statementBuffer, tagBuffer;
int status;
// make sure we don't get a situation where nothing is to be executed
if (statement == Py_None && !cursor->statement) {
cxoError_raiseFromString(cxoProgrammingErrorException,
"no statement specified and no prior statement prepared");
return -1;
}
// nothing to do if the statement is identical to the one already stored
// but go ahead and prepare anyway for create, alter and drop statments
if (statement == Py_None || statement == cursor->statement) {
if (cursor->handle && !cursor->stmtInfo.isDDL)
return 0;
statement = cursor->statement;
}
// keep track of the statement
Py_XDECREF(cursor->statement);
Py_INCREF(statement);
cursor->statement = statement;
// keep track of the tag
Py_XDECREF(cursor->statementTag);
Py_XINCREF(statementTag);
cursor->statementTag = statementTag;
// clear fetch and bind variables if applicable
Py_CLEAR(cursor->fetchVariables);
if (!cursor->setInputSizes)
Py_CLEAR(cursor->bindVariables);
// prepare statement
if (cxoBuffer_fromObject(&statementBuffer, statement,
cursor->connection->encodingInfo.encoding) < 0)
return -1;
if (cxoBuffer_fromObject(&tagBuffer, statementTag,
cursor->connection->encodingInfo.encoding) < 0) {
cxoBuffer_clear(&statementBuffer);
return -1;
}
Py_BEGIN_ALLOW_THREADS
if (cursor->handle)
dpiStmt_release(cursor->handle);
status = dpiConn_prepareStmt(cursor->connection->handle,
cursor->isScrollable, (const char*) statementBuffer.ptr,
statementBuffer.size, (const char*) tagBuffer.ptr, tagBuffer.size,
&cursor->handle);
Py_END_ALLOW_THREADS
cxoBuffer_clear(&statementBuffer);
cxoBuffer_clear(&tagBuffer);
if (status < 0)
return cxoError_raiseAndReturnInt();
// get statement information
if (dpiStmt_getInfo(cursor->handle, &cursor->stmtInfo) < 0)
return cxoError_raiseAndReturnInt();
// set the fetch array size, if applicable
if (cursor->stmtInfo.statementType == DPI_STMT_TYPE_SELECT) {
if (dpiStmt_setFetchArraySize(cursor->handle, cursor->arraySize) < 0)
return cxoError_raiseAndReturnInt();
}
// clear row factory, if applicable
Py_CLEAR(cursor->rowFactory);
return 0;
}
//-----------------------------------------------------------------------------
// cxoCursor_parse()
// Parse the statement without executing it. This also retrieves information
// about the select list for select statements.
//-----------------------------------------------------------------------------
static PyObject *cxoCursor_parse(cxoCursor *cursor, PyObject *statement)
{
uint32_t mode, numQueryColumns;
dpiStmtInfo stmtInfo;
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