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//-----------------------------------------------------------------------------
// Copyright (c) 2016, 2020, 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"
//-----------------------------------------------------------------------------
// 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;
int isScrollable;
// parse arguments
scrollableObj = NULL;
if (!PyArg_ParseTupleAndKeywords(args, keywordArgs, "O!|O", keywordList,
&cxoPyTypeConnection, &connection, &scrollableObj))
return -1;
if (cxoUtils_getBooleanValue(scrollableObj, 0, &isScrollable) < 0)
return -1;
cursor->isScrollable = (char) isScrollable;
// initialize members
Py_INCREF(connection);
cursor->connection = connection;
cursor->arraySize = 100;
cursor->fetchArraySize = 100;
cursor->prefetchRows = DPI_DEFAULT_PREFETCH_ROWS;
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_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;
cxoTransformNum transformNum;
cxoObjectType *objectType;
dpiQueryInfo queryInfo;
uint32_t pos, size;
cxoDbType *dbType;
char message[120];
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 types to use
transformNum =
cxoTransform_getNumFromDataTypeInfo(&queryInfo.typeInfo);
if (transformNum == CXO_TRANSFORM_UNSUPPORTED) {
snprintf(message, sizeof(message), "Oracle type %d not supported.",
queryInfo.typeInfo.oracleTypeNum);
cxoError_raiseFromString(cxoNotSupportedErrorException, message);
return -1;
}
dbType = cxoDbType_fromTransformNum(transformNum);
if (!dbType)
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, (Py_ssize_t) queryInfo.nameLength,
dbType, 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, transformNum,
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_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_itemDescription()
// Return a tuple describing the item at the given position.
//-----------------------------------------------------------------------------
static PyObject *cxoCursor_itemDescription(cxoCursor *cursor, uint32_t pos)
{
int displaySize, index;
dpiQueryInfo queryInfo;
PyObject *tuple, *temp;
cxoDbType *dbType;
// get information about the column position
if (dpiStmt_getQueryInfo(cursor->handle, pos, &queryInfo) < 0)
return NULL;
dbType = cxoDbType_fromDataTypeInfo(&queryInfo.typeInfo);
if (!dbType)
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, PyUnicode_Decode(queryInfo.name,
queryInfo.nameLength, cursor->connection->encodingInfo.encoding,
NULL));
Py_INCREF(dbType);
PyTuple_SET_ITEM(tuple, 1, (PyObject*) dbType);
if (displaySize)
PyTuple_SET_ITEM(tuple, 2, PyLong_FromLong(displaySize));
else {
Py_INCREF(Py_None);
PyTuple_SET_ITEM(tuple, 2, Py_None);
}
if (queryInfo.typeInfo.clientSizeInBytes)
PyTuple_SET_ITEM(tuple, 3,
PyLong_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,
PyLong_FromLong(queryInfo.typeInfo.precision));
PyTuple_SET_ITEM(tuple, 5,
PyLong_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, PyLong_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_getLastRowid()
// Return the rowid of the last modified row if applicable. If no row was
// modified the value None is returned.
//-----------------------------------------------------------------------------
static PyObject *cxoCursor_getLastRowid(cxoCursor *cursor, void *unused)
{
uint32_t rowidStrLength;
const char *rowidStr;
dpiRowid *rowid;
// make sure the cursor is open
if (cxoCursor_isOpen(cursor) < 0)
return NULL;
// get the value, if applicable
if (cursor->handle) {
if (dpiStmt_getLastRowid(cursor->handle, &rowid) < 0)
return cxoError_raiseAndReturnNull();
if (rowid) {
if (dpiRowid_getStringValue(rowid, &rowidStr, &rowidStrLength) < 0)
return cxoError_raiseAndReturnNull();
return PyUnicode_Decode(rowidStr, rowidStrLength,
cursor->connection->encodingInfo.encoding, NULL);
}
}
Py_RETURN_NONE;
}
//-----------------------------------------------------------------------------
// cxoCursor_getOciAttr()
// Return the value of the OCI attribute. This is intended to be used for
// testing attributes which are not currently exposed directly and should only
// be used for that purpose.
//-----------------------------------------------------------------------------
static PyObject *cxoCursor_getOciAttr(cxoCursor *cursor, PyObject *args,
PyObject *keywordArgs)
{
static char *keywordList[] = { "attr_num", "attr_type", NULL };
unsigned attrNum, attrType;
uint32_t valueLength;
dpiDataBuffer value;
// validate parameters
if (!PyArg_ParseTupleAndKeywords(args, keywordArgs, "II", keywordList,
&attrNum, &attrType))
return NULL;
if (cxoCursor_isOpen(cursor) < 0)
return NULL;
// get value and convert it to the appropriate Python value
if (dpiStmt_getOciAttr(cursor->handle, attrNum, &value, &valueLength) < 0)
return cxoError_raiseAndReturnNull();
return cxoUtils_convertOciAttrToPythonValue(attrType, &value, valueLength,
cursor->connection->encodingInfo.encoding);
}
//-----------------------------------------------------------------------------
// cxoCursor_getPrefetchRows()
// Return an integer providing the number of rows that are prefetched by the
// Oracle Client library.
//-----------------------------------------------------------------------------
static PyObject *cxoCursor_getPrefetchRows(cxoCursor *cursor, void *unused)
{
if (cxoCursor_isOpen(cursor) < 0)
return NULL;
return PyLong_FromUnsignedLong(cursor->prefetchRows);
}
//-----------------------------------------------------------------------------
// 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->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->transformNum, 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;
}
// 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();
}
// set number of rows to prefetch on execute, if applicable
if (cursor->prefetchRows != DPI_DEFAULT_PREFETCH_ROWS) {
if (dpiStmt_setPrefetchRows(cursor->handle, cursor->prefetchRows) < 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;
int status;
// make sure the cursor is open
if (cxoCursor_isOpen(cursor) < 0)
return NULL;
// prepare the statement and get statement information
if (cxoCursor_internalPrepare(cursor, statement, NULL) < 0)
return NULL;
if (dpiStmt_getInfo(cursor->handle, &stmtInfo) < 0)
return cxoError_raiseAndReturnNull();
// parse the statement
if (stmtInfo.isQuery)
mode = DPI_MODE_EXEC_DESCRIBE_ONLY;
else mode = DPI_MODE_EXEC_PARSE_ONLY;
Py_BEGIN_ALLOW_THREADS
status = dpiStmt_execute(cursor->handle, mode, &numQueryColumns);
Py_END_ALLOW_THREADS
if (status < 0)
return cxoError_raiseAndReturnNull();
Py_RETURN_NONE;
}
//-----------------------------------------------------------------------------
// cxoCursor_prepare()
// Prepare the statement for execution.
//-----------------------------------------------------------------------------
static PyObject *cxoCursor_prepare(cxoCursor *cursor, PyObject *args)
{
PyObject *statement, *statementTag;
// statement text and optional tag is expected
statementTag = NULL;
if (!PyArg_ParseTuple(args, "O|O", &statement, &statementTag))
return NULL;
// make sure the cursor is open
if (cxoCursor_isOpen(cursor) < 0)
return NULL;
// prepare the statement
if (cxoCursor_internalPrepare(cursor, statement, statementTag) < 0)
return NULL;
Py_RETURN_NONE;
}
//-----------------------------------------------------------------------------
// cxoCursor_callCalculateSize()
// Calculate the size of the statement that is to be executed.
//-----------------------------------------------------------------------------
static int cxoCursor_callCalculateSize(PyObject *name,
cxoVar *returnValue, PyObject *listOfArguments,
PyObject *keywordArguments, int *size)
{
Py_ssize_t numPositionalArgs, numKeywordArgs;
// set base size without any arguments
*size = 17;
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