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2209 lines (1915 loc) · 73.8 KB
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//-----------------------------------------------------------------------------
// Copyright 2016, 2017, 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.
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// Cursor.c
// Definition of the Python type OracleCursor.
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// structure for the Python type "Cursor"
//-----------------------------------------------------------------------------
typedef struct {
PyObject_HEAD
dpiStmt *handle;
dpiStmtInfo stmtInfo;
udt_Connection *connection;
PyObject *statement;
PyObject *statementTag;
PyObject *bindVariables;
PyObject *fetchVariables;
PyObject *rowFactory;
PyObject *inputTypeHandler;
PyObject *outputTypeHandler;
uint32_t arraySize;
uint32_t bindArraySize;
uint32_t fetchArraySize;
int setInputSizes;
int outputSize;
int outputSizeColumn;
uint64_t rowCount;
uint32_t fetchBufferRowIndex;
uint32_t numRowsInFetchBuffer;
int moreRowsToFetch;
int isScrollable;
int fixupRefCursor;
int isOpen;
} udt_Cursor;
//-----------------------------------------------------------------------------
// dependent function defintions
//-----------------------------------------------------------------------------
static void Cursor_Free(udt_Cursor*);
//-----------------------------------------------------------------------------
// functions for the Python type "Cursor"
//-----------------------------------------------------------------------------
static PyObject *Cursor_GetIter(udt_Cursor*);
static PyObject *Cursor_GetNext(udt_Cursor*);
static PyObject *Cursor_Close(udt_Cursor*, PyObject*);
static PyObject *Cursor_CallFunc(udt_Cursor*, PyObject*, PyObject*);
static PyObject *Cursor_CallProc(udt_Cursor*, PyObject*, PyObject*);
static PyObject *Cursor_Execute(udt_Cursor*, PyObject*, PyObject*);
static PyObject *Cursor_ExecuteMany(udt_Cursor*, PyObject*, PyObject*);
static PyObject *Cursor_ExecuteManyPrepared(udt_Cursor*, PyObject*);
static PyObject *Cursor_FetchOne(udt_Cursor*, PyObject*);
static PyObject *Cursor_FetchMany(udt_Cursor*, PyObject*, PyObject*);
static PyObject *Cursor_FetchAll(udt_Cursor*, PyObject*);
static PyObject *Cursor_FetchRaw(udt_Cursor*, PyObject*, PyObject*);
static PyObject *Cursor_Parse(udt_Cursor*, PyObject*);
static PyObject *Cursor_Prepare(udt_Cursor*, PyObject*);
static PyObject *Cursor_Scroll(udt_Cursor*, PyObject*, PyObject*);
static PyObject *Cursor_SetInputSizes(udt_Cursor*, PyObject*, PyObject*);
static PyObject *Cursor_SetOutputSize(udt_Cursor*, PyObject*);
static PyObject *Cursor_Var(udt_Cursor*, PyObject*, PyObject*);
static PyObject *Cursor_ArrayVar(udt_Cursor*, PyObject*);
static PyObject *Cursor_BindNames(udt_Cursor*, PyObject*);
static PyObject *Cursor_GetDescription(udt_Cursor*, void*);
static PyObject *Cursor_New(PyTypeObject*, PyObject*, PyObject*);
static int Cursor_Init(udt_Cursor*, PyObject*, PyObject*);
static PyObject *Cursor_Repr(udt_Cursor*);
static PyObject* Cursor_GetBatchErrors(udt_Cursor*);
static PyObject *Cursor_GetArrayDMLRowCounts(udt_Cursor*);
static PyObject *Cursor_GetImplicitResults(udt_Cursor*);
static int Cursor_PerformDefine(udt_Cursor*, uint32_t);
static int Cursor_GetVarData(udt_Cursor*);
//-----------------------------------------------------------------------------
// declaration of methods for Python type "Cursor"
//-----------------------------------------------------------------------------
static PyMethodDef g_CursorMethods[] = {
{ "execute", (PyCFunction) Cursor_Execute, METH_VARARGS | METH_KEYWORDS },
{ "fetchall", (PyCFunction) Cursor_FetchAll, METH_NOARGS },
{ "fetchone", (PyCFunction) Cursor_FetchOne, METH_NOARGS },
{ "fetchmany", (PyCFunction) Cursor_FetchMany,
METH_VARARGS | METH_KEYWORDS },
{ "fetchraw", (PyCFunction) Cursor_FetchRaw,
METH_VARARGS | METH_KEYWORDS },
{ "prepare", (PyCFunction) Cursor_Prepare, METH_VARARGS },
{ "parse", (PyCFunction) Cursor_Parse, METH_VARARGS },
{ "setinputsizes", (PyCFunction) Cursor_SetInputSizes,
METH_VARARGS | METH_KEYWORDS },
{ "executemany", (PyCFunction) Cursor_ExecuteMany,
METH_VARARGS | METH_KEYWORDS },
{ "callproc", (PyCFunction) Cursor_CallProc,
METH_VARARGS | METH_KEYWORDS },
{ "callfunc", (PyCFunction) Cursor_CallFunc,
METH_VARARGS | METH_KEYWORDS },
{ "executemanyprepared", (PyCFunction) Cursor_ExecuteManyPrepared,
METH_VARARGS },
{ "setoutputsize", (PyCFunction) Cursor_SetOutputSize, METH_VARARGS },
{ "scroll", (PyCFunction) Cursor_Scroll, METH_VARARGS | METH_KEYWORDS },
{ "var", (PyCFunction) Cursor_Var, METH_VARARGS | METH_KEYWORDS },
{ "arrayvar", (PyCFunction) Cursor_ArrayVar, METH_VARARGS },
{ "bindnames", (PyCFunction) Cursor_BindNames, METH_NOARGS },
{ "close", (PyCFunction) Cursor_Close, METH_NOARGS },
{ "getbatcherrors", (PyCFunction) Cursor_GetBatchErrors, METH_NOARGS },
{ "getarraydmlrowcounts", (PyCFunction) Cursor_GetArrayDMLRowCounts,
METH_NOARGS },
{ "getimplicitresults", (PyCFunction) Cursor_GetImplicitResults,
METH_NOARGS },
{ NULL, NULL }
};
//-----------------------------------------------------------------------------
// declaration of members for Python type "Cursor"
//-----------------------------------------------------------------------------
static PyMemberDef g_CursorMembers[] = {
{ "arraysize", T_UINT, offsetof(udt_Cursor, arraySize), 0 },
{ "bindarraysize", T_UINT, offsetof(udt_Cursor, bindArraySize), 0 },
{ "rowcount", T_ULONGLONG, offsetof(udt_Cursor, rowCount), READONLY },
{ "statement", T_OBJECT, offsetof(udt_Cursor, statement), READONLY },
{ "connection", T_OBJECT_EX, offsetof(udt_Cursor, connection), READONLY },
{ "rowfactory", T_OBJECT, offsetof(udt_Cursor, rowFactory), 0 },
{ "bindvars", T_OBJECT, offsetof(udt_Cursor, bindVariables), READONLY },
{ "fetchvars", T_OBJECT, offsetof(udt_Cursor, fetchVariables), READONLY },
{ "inputtypehandler", T_OBJECT, offsetof(udt_Cursor, inputTypeHandler),
0 },
{ "outputtypehandler", T_OBJECT, offsetof(udt_Cursor, outputTypeHandler),
0 },
{ "scrollable", T_BOOL, offsetof(udt_Cursor, isScrollable), 0 },
{ NULL }
};
//-----------------------------------------------------------------------------
// declaration of calculated members for Python type "Connection"
//-----------------------------------------------------------------------------
static PyGetSetDef g_CursorCalcMembers[] = {
{ "description", (getter) Cursor_GetDescription, 0, 0, 0 },
{ NULL }
};
//-----------------------------------------------------------------------------
// declaration of Python type "Cursor"
//-----------------------------------------------------------------------------
static PyTypeObject g_CursorType = {
PyVarObject_HEAD_INIT(NULL, 0)
"cx_Oracle.Cursor", // tp_name
sizeof(udt_Cursor), // tp_basicsize
0, // tp_itemsize
(destructor) Cursor_Free, // tp_dealloc
0, // tp_print
0, // tp_getattr
0, // tp_setattr
0, // tp_compare
(reprfunc) Cursor_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) Cursor_GetIter, // tp_iter
(iternextfunc) Cursor_GetNext, // tp_iternext
g_CursorMethods, // tp_methods
g_CursorMembers, // tp_members
g_CursorCalcMembers, // tp_getset
0, // tp_base
0, // tp_dict
0, // tp_descr_get
0, // tp_descr_set
0, // tp_dictoffset
(initproc) Cursor_Init, // tp_init
0, // tp_alloc
Cursor_New, // tp_new
0, // tp_free
0, // tp_is_gc
0 // tp_bases
};
#include "Variable.c"
//-----------------------------------------------------------------------------
// Cursor_New()
// Create a new cursor object.
//-----------------------------------------------------------------------------
static PyObject *Cursor_New(PyTypeObject *type, PyObject *args,
PyObject *keywordArgs)
{
return type->tp_alloc(type, 0);
}
//-----------------------------------------------------------------------------
// Cursor_Init()
// Create a new cursor object.
//-----------------------------------------------------------------------------
static int Cursor_Init(udt_Cursor *self, PyObject *args, PyObject *keywordArgs)
{
static char *keywordList[] = { "connection", "scrollable", NULL };
udt_Connection *connection;
PyObject *scrollableObj;
// parse arguments
scrollableObj = NULL;
if (!PyArg_ParseTupleAndKeywords(args, keywordArgs, "O!|O", keywordList,
&g_ConnectionType, &connection, &scrollableObj))
return -1;
if (GetBooleanValue(scrollableObj, 0, &self->isScrollable) < 0)
return -1;
// initialize members
Py_INCREF(connection);
self->connection = connection;
self->arraySize = 100;
self->fetchArraySize = 100;
self->bindArraySize = 1;
self->outputSize = -1;
self->outputSizeColumn = -1;
self->isOpen = 1;
return 0;
}
//-----------------------------------------------------------------------------
// Cursor_Repr()
// Return a string representation of the cursor.
//-----------------------------------------------------------------------------
static PyObject *Cursor_Repr(udt_Cursor *cursor)
{
PyObject *connectionRepr, *module, *name, *result, *format, *formatArgs;
format = cxString_FromAscii("<%s.%s on %s>");
if (!format)
return NULL;
connectionRepr = PyObject_Repr((PyObject*) cursor->connection);
if (!connectionRepr) {
Py_DECREF(format);
return NULL;
}
if (GetModuleAndName(Py_TYPE(cursor), &module, &name) < 0) {
Py_DECREF(format);
Py_DECREF(connectionRepr);
return NULL;
}
formatArgs = PyTuple_Pack(3, module, name, connectionRepr);
Py_DECREF(module);
Py_DECREF(name);
Py_DECREF(connectionRepr);
if (!formatArgs) {
Py_DECREF(format);
return NULL;
}
result = cxString_Format(format, formatArgs);
Py_DECREF(format);
Py_DECREF(formatArgs);
return result;
}
//-----------------------------------------------------------------------------
// Cursor_Free()
// Deallocate the cursor.
//-----------------------------------------------------------------------------
static void Cursor_Free(udt_Cursor *self)
{
Py_CLEAR(self->statement);
Py_CLEAR(self->statementTag);
Py_CLEAR(self->bindVariables);
Py_CLEAR(self->fetchVariables);
if (self->handle) {
dpiStmt_release(self->handle);
self->handle = NULL;
}
Py_CLEAR(self->connection);
Py_CLEAR(self->rowFactory);
Py_CLEAR(self->inputTypeHandler);
Py_CLEAR(self->outputTypeHandler);
Py_TYPE(self)->tp_free((PyObject*) self);
}
//-----------------------------------------------------------------------------
// Cursor_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 Cursor_IsOpen(udt_Cursor *self)
{
if (!self->isOpen) {
PyErr_SetString(g_InterfaceErrorException, "not open");
return -1;
}
return Connection_IsConnected(self->connection);
}
//-----------------------------------------------------------------------------
// Cursor_VerifyFetch()
// Verify that fetching may happen from this cursor.
//-----------------------------------------------------------------------------
static int Cursor_VerifyFetch(udt_Cursor *self)
{
uint32_t numQueryColumns;
// make sure the cursor is open
if (Cursor_IsOpen(self) < 0)
return -1;
// fixup REF cursor, if applicable
if (self->fixupRefCursor) {
if (dpiStmt_getNumQueryColumns(self->handle, &numQueryColumns) < 0)
return Error_RaiseAndReturnInt();
if (Cursor_PerformDefine(self, numQueryColumns) < 0)
return Error_RaiseAndReturnInt();
self->fixupRefCursor = 0;
}
// make sure the cursor is for a query
if (!self->fetchVariables) {
PyErr_SetString(g_InterfaceErrorException, "not a query");
return -1;
}
return 0;
}
//-----------------------------------------------------------------------------
// Cursor_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 Cursor_FetchRow(udt_Cursor *self, 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 (self->numRowsInFetchBuffer == 0 && self->moreRowsToFetch) {
Py_BEGIN_ALLOW_THREADS
status = dpiStmt_fetchRows(self->handle, self->fetchArraySize,
&self->fetchBufferRowIndex, &self->numRowsInFetchBuffer,
&self->moreRowsToFetch);
Py_END_ALLOW_THREADS
if (status < 0)
return Error_RaiseAndReturnInt();
}
// keep track of where we are in the fetch buffer
if (self->numRowsInFetchBuffer == 0)
*found = 0;
else {
*found = 1;
*bufferRowIndex = self->fetchBufferRowIndex++;
self->numRowsInFetchBuffer--;
}
return 0;
}
//-----------------------------------------------------------------------------
// Cursor_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 Cursor_PerformDefine(udt_Cursor *self, uint32_t numQueryColumns)
{
PyObject *outputTypeHandler, *result;
udt_ObjectType *objectType;
udt_VariableType *varType;
dpiQueryInfo queryInfo;
uint32_t pos, size;
udt_Variable *var;
// create a list corresponding to the number of items
self->fetchVariables = PyList_New(numQueryColumns);
if (!self->fetchVariables)
return -1;
// 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
self->numRowsInFetchBuffer = 0;
self->moreRowsToFetch = 1;
// create a variable for each of the query columns
self->fetchArraySize = self->arraySize;
for (pos = 1; pos <= numQueryColumns; pos++) {
// get query information for the column position
if (dpiStmt_getQueryInfo(self->handle, pos, &queryInfo) < 0)
return Error_RaiseAndReturnInt();
if (queryInfo.sizeInChars)
size = queryInfo.sizeInChars;
else size = queryInfo.clientSizeInBytes;
// determine object type, if applicable
objectType = NULL;
if (queryInfo.objectType) {
objectType = ObjectType_New(self->connection,
queryInfo.objectType);
if (!objectType)
return -1;
}
// if setoutputsize() called, use its value instead
if (self->outputSize >= 0) {
if (self->outputSizeColumn < 0 ||
(int) pos == self->outputSizeColumn)
size = self->outputSize;
}
// determine the default type
varType = VarType_FromQueryInfo(&queryInfo);
if (!varType)
return -1;
// see if an output type handler should be used
var = NULL;
outputTypeHandler = NULL;
if (self->outputTypeHandler && self->outputTypeHandler != Py_None)
outputTypeHandler = self->outputTypeHandler;
else if (self->connection->outputTypeHandler &&
self->connection->outputTypeHandler != Py_None)
outputTypeHandler = self->connection->outputTypeHandler;
// if using an output type handler, None implies default behavior
if (outputTypeHandler) {
result = PyObject_CallFunction(outputTypeHandler, "Os#Oiii",
self, queryInfo.name, queryInfo.nameLength,
varType->pythonType, size, queryInfo.precision,
queryInfo.scale);
if (!result) {
Py_XDECREF(objectType);
return -1;
} else if (result == Py_None)
Py_DECREF(result);
else if (!Variable_Check(result)) {
Py_DECREF(result);
Py_XDECREF(objectType);
PyErr_SetString(PyExc_TypeError,
"expecting variable from output type handler");
return -1;
} else {
var = (udt_Variable*) result;
if (var->allocatedElements < self->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 = Variable_New(self, self->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(self->fetchVariables, pos - 1, (PyObject *) var);
if (dpiStmt_define(self->handle, pos, var->handle) < 0)
return Error_RaiseAndReturnInt();
}
return 0;
}
//-----------------------------------------------------------------------------
// Cursor_ItemDescription()
// Return a tuple describing the item at the given position.
//-----------------------------------------------------------------------------
static PyObject *Cursor_ItemDescription(udt_Cursor *self, uint32_t pos)
{
udt_VariableType *varType;
int displaySize, index;
dpiQueryInfo queryInfo;
PyObject *tuple, *temp;
// get information about the column position
if (dpiStmt_getQueryInfo(self->handle, pos, &queryInfo) < 0)
return NULL;
varType = VarType_FromQueryInfo(&queryInfo);
if (!varType)
return NULL;
// set display size based on data type
switch (queryInfo.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.sizeInChars;
break;
case DPI_ORACLE_TYPE_RAW:
displaySize = (int) queryInfo.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.precision) {
displaySize = queryInfo.precision + 1;
if (queryInfo.scale > 0)
displaySize += queryInfo.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, cxString_FromEncodedString(queryInfo.name,
queryInfo.nameLength, self->connection->encodingInfo.encoding));
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.clientSizeInBytes)
PyTuple_SET_ITEM(tuple, 3,
PyInt_FromLong(queryInfo.clientSizeInBytes));
else {
Py_INCREF(Py_None);
PyTuple_SET_ITEM(tuple, 3, Py_None);
}
if (queryInfo.precision || queryInfo.scale) {
PyTuple_SET_ITEM(tuple, 4, PyInt_FromLong(queryInfo.precision));
PyTuple_SET_ITEM(tuple, 5, PyInt_FromLong(queryInfo.scale));
} 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;
}
//-----------------------------------------------------------------------------
// Cursor_GetDescription()
// Return a list of 7-tuples consisting of the description of the define
// variables.
//-----------------------------------------------------------------------------
static PyObject *Cursor_GetDescription(udt_Cursor *self, void *unused)
{
uint32_t numQueryColumns, i;
PyObject *results, *tuple;
// make sure the cursor is open
if (Cursor_IsOpen(self) < 0)
return NULL;
// determine the number of query columns; if not a query return None
if (!self->handle)
Py_RETURN_NONE;
if (dpiStmt_getNumQueryColumns(self->handle, &numQueryColumns) < 0)
return Error_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 = Cursor_ItemDescription(self, i + 1);
if (!tuple) {
Py_DECREF(results);
return NULL;
}
PyList_SET_ITEM(results, i, tuple);
}
return results;
}
//-----------------------------------------------------------------------------
// Cursor_Close()
// Close the cursor. Any action taken on this cursor from this point forward
// results in an exception being raised.
//-----------------------------------------------------------------------------
static PyObject *Cursor_Close(udt_Cursor *self, PyObject *args)
{
if (Cursor_IsOpen(self) < 0)
return NULL;
Py_CLEAR(self->bindVariables);
Py_CLEAR(self->fetchVariables);
if (self->handle) {
if (dpiStmt_close(self->handle, NULL, 0) < 0)
return Error_RaiseAndReturnNull();
dpiStmt_release(self->handle);
self->handle = NULL;
}
self->isOpen = 0;
Py_RETURN_NONE;
}
//-----------------------------------------------------------------------------
// Cursor_SetBindVariableHelper()
// Helper for setting a bind variable.
//-----------------------------------------------------------------------------
static int Cursor_SetBindVariableHelper(udt_Cursor *self, unsigned numElements,
unsigned arrayPos, PyObject *value, udt_Variable *origVar,
udt_Variable **newVar, int deferTypeAssignment)
{
int isValueVar;
// initialization
*newVar = NULL;
isValueVar = Variable_Check(value);
// handle case where variable is already bound
if (origVar) {
// if the value is a variable object, rebind it if necessary
if (isValueVar) {
if ( (PyObject*) origVar != value) {
Py_INCREF(value);
*newVar = (udt_Variable*) value;
}
// 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 = Variable_New(self, numElements, origVar->type,
origVar->size, origVar->isArray, origVar->objectType);
if (!*newVar)
return -1;
if (Variable_SetValue(*newVar, arrayPos, value) < 0) {
Py_CLEAR(*newVar);
return -1;
}
// otherwise, attempt to set the value
} else if (Variable_SetValue(origVar, 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();
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 = (udt_Variable*) 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 = Variable_NewByValue(self, value, numElements);
if (!*newVar)
return -1;
if (Variable_SetValue(*newVar, arrayPos, value) < 0) {
Py_CLEAR(*newVar);
return -1;
}
}
}
return 0;
}
//-----------------------------------------------------------------------------
// Cursor_SetBindVariables()
// Create or set bind variables.
//-----------------------------------------------------------------------------
static int Cursor_SetBindVariables(udt_Cursor *self, PyObject *parameters,
unsigned numElements, unsigned arrayPos, int deferTypeAssignment)
{
uint32_t i, origBoundByPos, origNumParams, boundByPos, numParams;
PyObject *key, *value, *origVar;
udt_Variable *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 (self->bindVariables) {
origBoundByPos = PyList_Check(self->bindVariables);
if (boundByPos != origBoundByPos) {
PyErr_SetString(g_ProgrammingErrorException,
"positional and named binds cannot be intermixed");
return -1;
}
if (origBoundByPos)
origNumParams = (uint32_t) PyList_GET_SIZE(self->bindVariables);
// otherwise, create the list or dictionary if needed
} else {
if (boundByPos)
self->bindVariables = PyList_New(numParams);
else self->bindVariables = PyDict_New();
if (!self->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(self->bindVariables, i);
if (origVar == Py_None)
origVar = NULL;
} else origVar = NULL;
if (Cursor_SetBindVariableHelper(self, numElements, arrayPos,
value, (udt_Variable*) origVar, &newVar,
deferTypeAssignment) < 0)
return -1;
if (newVar) {
if (i < PyList_GET_SIZE(self->bindVariables)) {
if (PyList_SetItem(self->bindVariables, i,
(PyObject*) newVar) < 0) {
Py_DECREF(newVar);
return -1;
}
} else {
if (PyList_Append(self->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(self->bindVariables, key);
if (Cursor_SetBindVariableHelper(self, numElements, arrayPos,
value, (udt_Variable*) origVar, &newVar,
deferTypeAssignment) < 0)
return -1;
if (newVar) {
if (PyDict_SetItem(self->bindVariables, key,
(PyObject*) newVar) < 0) {
Py_DECREF(newVar);
return -1;
}
Py_DECREF(newVar);
}
}
}
return 0;
}
//-----------------------------------------------------------------------------
// Cursor_PerformBind()
// Perform the binds on the cursor.
//-----------------------------------------------------------------------------
static int Cursor_PerformBind(udt_Cursor *self)
{
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
self->setInputSizes = 0;
// set values and perform binds for all bind variables
if (self->bindVariables) {
if (PyDict_Check(self->bindVariables)) {
pos = 0;
while (PyDict_Next(self->bindVariables, &pos, &key, &var)) {
if (Variable_Bind((udt_Variable*) var, self, key, 0) < 0)
return -1;
}
} else {
for (i = 0; i < PyList_GET_SIZE(self->bindVariables); i++) {
var = PyList_GET_ITEM(self->bindVariables, i);
if (var != Py_None) {
if (Variable_Bind((udt_Variable*) var, self, NULL,
i + 1) < 0)
return -1;
}
}
}
}
return 0;
}
//-----------------------------------------------------------------------------
// Cursor_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 *Cursor_CreateRow(udt_Cursor *self, uint32_t pos)
{
PyObject *tuple, *item, *result;
Py_ssize_t numItems, i;
udt_Variable *var;
// bump row count as a new row has been found
self->rowCount++;
// create a new tuple
numItems = PyList_GET_SIZE(self->fetchVariables);
tuple = PyTuple_New(numItems);
if (!tuple)
return NULL;
// acquire the value for each item
for (i = 0; i < numItems; i++) {
var = (udt_Variable*) PyList_GET_ITEM(self->fetchVariables, i);
item = Variable_GetSingleValue(var, pos);
if (!item) {
Py_DECREF(tuple);
return NULL;
}
PyTuple_SET_ITEM(tuple, i, item);
}
// if a row factory is defined, call it
if (self->rowFactory && self->rowFactory != Py_None) {
result = PyObject_CallObject(self->rowFactory, tuple);
Py_DECREF(tuple);
return result;
}
return tuple;
}
//-----------------------------------------------------------------------------
// Cursor_InternalPrepare()
// Internal method for preparing a statement for execution.
//-----------------------------------------------------------------------------
static int Cursor_InternalPrepare(udt_Cursor *self, PyObject *statement,
PyObject *statementTag)
{
udt_Buffer statementBuffer, tagBuffer;
int status;
// make sure we don't get a situation where nothing is to be executed
if (statement == Py_None && !self->statement) {
PyErr_SetString(g_ProgrammingErrorException,
"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 == self->statement) {
if (self->handle && !self->stmtInfo.isDDL)
return 0;
statement = self->statement;
}
// keep track of the statement
Py_XDECREF(self->statement);
Py_INCREF(statement);
self->statement = statement;
// keep track of the tag
Py_XDECREF(self->statementTag);
Py_XINCREF(statementTag);
self->statementTag = statementTag;
// clear fetch and bind variables if applicable
Py_CLEAR(self->fetchVariables);
if (!self->setInputSizes)
Py_CLEAR(self->bindVariables);
// prepare statement
if (cxBuffer_FromObject(&statementBuffer, statement,
self->connection->encodingInfo.encoding) < 0)
return -1;
if (cxBuffer_FromObject(&tagBuffer, statementTag,
self->connection->encodingInfo.encoding) < 0) {
cxBuffer_Clear(&statementBuffer);
return -1;
}
Py_BEGIN_ALLOW_THREADS
if (self->handle)
dpiStmt_release(self->handle);
status = dpiConn_prepareStmt(self->connection->handle, self->isScrollable,
(const char*) statementBuffer.ptr, statementBuffer.size,
(const char*) tagBuffer.ptr, tagBuffer.size, &self->handle);
Py_END_ALLOW_THREADS
cxBuffer_Clear(&statementBuffer);
cxBuffer_Clear(&tagBuffer);
if (status < 0)
return Error_RaiseAndReturnInt();
// get statement information
if (dpiStmt_getInfo(self->handle, &self->stmtInfo) < 0)
return Error_RaiseAndReturnInt();
// set the fetch array size
if (dpiStmt_setFetchArraySize(self->handle, self->arraySize) < 0)
return Error_RaiseAndReturnInt();
// clear row factory, if applicable
Py_CLEAR(self->rowFactory);
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