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//-----------------------------------------------------------------------------
// Copyright (c) 2018, 2020, Oracle and/or its affiliates. All rights reserved.
//-----------------------------------------------------------------------------
//-----------------------------------------------------------------------------
// cxoTransform.c
// Defines routines used to transform Python objects to database values and
// database values to Python objects.
//-----------------------------------------------------------------------------
#include "cxoModule.h"
#include "datetime.h"
// PyPy compatibility
#ifndef PyDateTime_DELTA_GET_DAYS
#define PyDateTime_DELTA_GET_DAYS(x) ((x)->days)
#endif
#ifndef PyDateTime_DELTA_GET_SECONDS
#define PyDateTime_DELTA_GET_SECONDS(x) ((x)->seconds)
#endif
#ifndef PyDateTime_DELTA_GET_MICROSECONDS
#define PyDateTime_DELTA_GET_MICROSECONDS(x) ((x)->microseconds)
#endif
// forward declarations
static Py_ssize_t cxoTransform_calculateSize(PyObject *value,
cxoTransformNum transformNum);
static cxoTransformNum cxoTransform_getNumFromPythonType(PyTypeObject *type);
static PyObject *cxoTransform_toPythonFromJson(cxoConnection *connection,
dpiJsonNode *node, const char *encodingErrors);
//-----------------------------------------------------------------------------
// Types
//-----------------------------------------------------------------------------
typedef struct {
cxoTransformNum transformNum;
dpiOracleTypeNum oracleTypeNum;
dpiNativeTypeNum nativeTypeNum;
} cxoTransform;
//-----------------------------------------------------------------------------
// Globals
//-----------------------------------------------------------------------------
PyTypeObject *cxoPyTypeDate;
PyTypeObject *cxoPyTypeDateTime;
static PyTypeObject *cxoPyTypeDecimal;
static const cxoTransform cxoAllTransforms[] = {
{
CXO_TRANSFORM_NONE,
DPI_ORACLE_TYPE_VARCHAR,
DPI_NATIVE_TYPE_BYTES
},
{
CXO_TRANSFORM_BINARY,
DPI_ORACLE_TYPE_RAW,
DPI_NATIVE_TYPE_BYTES
},
{
CXO_TRANSFORM_BFILE,
DPI_ORACLE_TYPE_BFILE,
DPI_NATIVE_TYPE_LOB
},
{
CXO_TRANSFORM_BLOB,
DPI_ORACLE_TYPE_BLOB,
DPI_NATIVE_TYPE_LOB
},
{
CXO_TRANSFORM_BOOLEAN,
DPI_ORACLE_TYPE_BOOLEAN,
DPI_NATIVE_TYPE_BOOLEAN
},
{
CXO_TRANSFORM_CLOB,
DPI_ORACLE_TYPE_CLOB,
DPI_NATIVE_TYPE_LOB
},
{
CXO_TRANSFORM_CURSOR,
DPI_ORACLE_TYPE_STMT,
DPI_NATIVE_TYPE_STMT
},
{
CXO_TRANSFORM_DATE,
DPI_ORACLE_TYPE_DATE,
DPI_NATIVE_TYPE_TIMESTAMP
},
{
CXO_TRANSFORM_DATETIME,
DPI_ORACLE_TYPE_DATE,
DPI_NATIVE_TYPE_TIMESTAMP
},
{
CXO_TRANSFORM_DECIMAL,
DPI_ORACLE_TYPE_NUMBER,
DPI_NATIVE_TYPE_BYTES
},
{
CXO_TRANSFORM_FIXED_CHAR,
DPI_ORACLE_TYPE_CHAR,
DPI_NATIVE_TYPE_BYTES
},
{
CXO_TRANSFORM_FIXED_NCHAR,
DPI_ORACLE_TYPE_NCHAR,
DPI_NATIVE_TYPE_BYTES
},
{
CXO_TRANSFORM_FLOAT,
DPI_ORACLE_TYPE_NUMBER,
DPI_NATIVE_TYPE_BYTES
},
{
CXO_TRANSFORM_INT,
DPI_ORACLE_TYPE_NUMBER,
DPI_NATIVE_TYPE_BYTES
},
{
CXO_TRANSFORM_LONG_BINARY,
DPI_ORACLE_TYPE_LONG_RAW,
DPI_NATIVE_TYPE_BYTES
},
{
CXO_TRANSFORM_LONG_STRING,
DPI_ORACLE_TYPE_LONG_VARCHAR,
DPI_NATIVE_TYPE_BYTES
},
{
CXO_TRANSFORM_NATIVE_DOUBLE,
DPI_ORACLE_TYPE_NATIVE_DOUBLE,
DPI_NATIVE_TYPE_DOUBLE
},
{
CXO_TRANSFORM_NATIVE_FLOAT,
DPI_ORACLE_TYPE_NATIVE_FLOAT,
DPI_NATIVE_TYPE_FLOAT
},
{
CXO_TRANSFORM_NATIVE_INT,
DPI_ORACLE_TYPE_NATIVE_INT,
DPI_NATIVE_TYPE_INT64
},
{
CXO_TRANSFORM_NCLOB,
DPI_ORACLE_TYPE_NCLOB,
DPI_NATIVE_TYPE_LOB
},
{
CXO_TRANSFORM_NSTRING,
DPI_ORACLE_TYPE_NVARCHAR,
DPI_NATIVE_TYPE_BYTES
},
{
CXO_TRANSFORM_OBJECT,
DPI_ORACLE_TYPE_OBJECT,
DPI_NATIVE_TYPE_OBJECT
},
{
CXO_TRANSFORM_ROWID,
DPI_ORACLE_TYPE_ROWID,
DPI_NATIVE_TYPE_ROWID
},
{
CXO_TRANSFORM_STRING,
DPI_ORACLE_TYPE_VARCHAR,
DPI_NATIVE_TYPE_BYTES
},
{
CXO_TRANSFORM_TIMEDELTA,
DPI_ORACLE_TYPE_INTERVAL_DS,
DPI_NATIVE_TYPE_INTERVAL_DS
},
{
CXO_TRANSFORM_TIMESTAMP,
DPI_ORACLE_TYPE_TIMESTAMP,
DPI_NATIVE_TYPE_TIMESTAMP
},
{
CXO_TRANSFORM_TIMESTAMP_LTZ,
DPI_ORACLE_TYPE_TIMESTAMP_LTZ,
DPI_NATIVE_TYPE_TIMESTAMP
},
{
CXO_TRANSFORM_TIMESTAMP_TZ,
DPI_ORACLE_TYPE_TIMESTAMP_TZ,
DPI_NATIVE_TYPE_TIMESTAMP
},
{
CXO_TRANSFORM_JSON,
DPI_ORACLE_TYPE_JSON,
DPI_NATIVE_TYPE_JSON
}
};
//-----------------------------------------------------------------------------
// cxoTransform_calculateSize()
// Calculate the size to use with the specified transform and Python value.
// This function is only called by cxoTransform_getNumFromValue() and no
// attempt is made to verify the value further.
//-----------------------------------------------------------------------------
static Py_ssize_t cxoTransform_calculateSize(PyObject *value,
cxoTransformNum transformNum)
{
switch (transformNum) {
case CXO_TRANSFORM_NONE:
return 1;
case CXO_TRANSFORM_BINARY:
return PyBytes_GET_SIZE(value);
case CXO_TRANSFORM_NSTRING:
case CXO_TRANSFORM_STRING:
return PyUnicode_GET_LENGTH(value);
default:
break;
}
return 0;
}
//-----------------------------------------------------------------------------
// cxoTransform_dateFromTicks()
// Creates a date from ticks (number of seconds since Unix epoch).
//-----------------------------------------------------------------------------
PyObject *cxoTransform_dateFromTicks(PyObject *args)
{
return PyDate_FromTimestamp(args);
}
//-----------------------------------------------------------------------------
// cxoTransform_fromPython()
// Transforms a Python object into its corresponding database value.
//-----------------------------------------------------------------------------
int cxoTransform_fromPython(cxoTransformNum transformNum,
dpiNativeTypeNum *nativeTypeNum, PyObject *pyValue,
dpiDataBuffer *dbValue, cxoBuffer *buffer, const char *encoding,
const char *nencoding, cxoVar *var, uint32_t arrayPos)
{
cxoJsonBuffer jsonBuffer;
dpiIntervalDS *interval;
PyDateTime_Delta *delta;
int32_t deltaSeconds;
PyObject *tempValue;
cxoObject *obj;
cxoLob *lob;
int status;
switch (transformNum) {
case CXO_TRANSFORM_BOOLEAN:
dbValue->asBoolean = PyObject_IsTrue(pyValue);
if (PyErr_Occurred())
return -1;
return 0;
case CXO_TRANSFORM_BINARY:
case CXO_TRANSFORM_FIXED_CHAR:
case CXO_TRANSFORM_LONG_BINARY:
case CXO_TRANSFORM_LONG_STRING:
case CXO_TRANSFORM_STRING:
if (cxoBuffer_fromObject(buffer, pyValue, encoding) < 0)
return -1;
dbValue->asBytes.ptr = (char*) buffer->ptr;
dbValue->asBytes.length = buffer->size;
return 0;
case CXO_TRANSFORM_FIXED_NCHAR:
case CXO_TRANSFORM_NSTRING:
if (cxoBuffer_fromObject(buffer, pyValue, nencoding) < 0)
return -1;
dbValue->asBytes.ptr = (char*) buffer->ptr;
dbValue->asBytes.length = buffer->size;
return 0;
case CXO_TRANSFORM_BLOB:
case CXO_TRANSFORM_CLOB:
case CXO_TRANSFORM_NCLOB:
if (Py_TYPE(pyValue) == &cxoPyTypeLob) {
lob = (cxoLob*) pyValue;
if ((lob->dbType == cxoDbTypeBlob &&
transformNum != CXO_TRANSFORM_BLOB) ||
(lob->dbType == cxoDbTypeClob &&
transformNum != CXO_TRANSFORM_CLOB) ||
(lob->dbType == cxoDbTypeNclob &&
transformNum != CXO_TRANSFORM_NCLOB)) {
PyErr_SetString(PyExc_TypeError,
"LOB must be of the correct type");
return -1;
}
if (var) {
if (dpiVar_setFromLob(var->handle, arrayPos,
lob->handle) < 0)
return cxoError_raiseAndReturnInt();
} else dbValue->asLOB = lob->handle;
return 0;
}
if (transformNum == CXO_TRANSFORM_NCLOB)
encoding = nencoding;
if (cxoBuffer_fromObject(buffer, pyValue, encoding) < 0)
return -1;
if (var) {
Py_BEGIN_ALLOW_THREADS
status = dpiLob_setFromBytes(dbValue->asLOB, buffer->ptr,
buffer->size);
Py_END_ALLOW_THREADS
if (status < 0)
return cxoError_raiseAndReturnInt();
} else {
*nativeTypeNum = DPI_NATIVE_TYPE_BYTES;
dbValue->asBytes.ptr = (char*) buffer->ptr;
dbValue->asBytes.length = buffer->size;
}
return 0;
case CXO_TRANSFORM_NATIVE_INT:
if (PyBool_Check(pyValue)) {
dbValue->asInt64 = (pyValue == Py_True);
return 0;
}
if (!PyFloat_Check(pyValue) &&
!PyLong_Check(pyValue) &&
!PyObject_TypeCheck(pyValue, cxoPyTypeDecimal)) {
PyErr_SetString(PyExc_TypeError,
"expecting number or boolean");
return -1;
}
tempValue = PyObject_CallFunctionObjArgs((PyObject*) &PyLong_Type,
pyValue, NULL);
if (!tempValue)
return -1;
dbValue->asInt64 = PyLong_AsLong(tempValue);
status = (PyErr_Occurred()) ? -1 : 0;
Py_DECREF(tempValue);
return status;
case CXO_TRANSFORM_INT:
case CXO_TRANSFORM_DECIMAL:
case CXO_TRANSFORM_FLOAT:
if (PyBool_Check(pyValue)) {
buffer->ptr = (pyValue == Py_True) ? "1" : "0";
buffer->size = 1;
buffer->numCharacters = 1;
} else {
if (!PyFloat_Check(pyValue) &&
!PyLong_Check(pyValue) &&
!PyObject_TypeCheck(pyValue, cxoPyTypeDecimal)) {
PyErr_SetString(PyExc_TypeError, "expecting number");
return -1;
}
tempValue = PyObject_Str(pyValue);
if (!tempValue)
return -1;
status = cxoBuffer_fromObject(buffer, tempValue, encoding);
Py_DECREF(tempValue);
if (status < 0)
return -1;
}
dbValue->asBytes.ptr = (char*) buffer->ptr;
dbValue->asBytes.length = buffer->size;
return 0;
case CXO_TRANSFORM_NATIVE_DOUBLE:
case CXO_TRANSFORM_NATIVE_FLOAT:
if (!PyFloat_Check(pyValue) &&
!PyObject_TypeCheck(pyValue, cxoPyTypeDecimal) &&
!PyLong_Check(pyValue)) {
PyErr_SetString(PyExc_TypeError, "expecting float");
return -1;
}
if (transformNum == CXO_TRANSFORM_NATIVE_FLOAT)
dbValue->asFloat = (float) PyFloat_AsDouble(pyValue);
else dbValue->asDouble = PyFloat_AsDouble(pyValue);
if (PyErr_Occurred())
return -1;
return 0;
case CXO_TRANSFORM_OBJECT:
if (Py_TYPE(pyValue) != &cxoPyTypeObject) {
PyErr_SetString(PyExc_TypeError, "expecting cx_Oracle.Object");
return -1;
}
obj = (cxoObject*) pyValue;
if (var) {
if (dpiVar_setFromObject(var->handle, arrayPos,
obj->handle) < 0)
return cxoError_raiseAndReturnInt();
} else dbValue->asObject = obj->handle;
return 0;
case CXO_TRANSFORM_DATE:
case CXO_TRANSFORM_DATETIME:
case CXO_TRANSFORM_TIMESTAMP:
case CXO_TRANSFORM_TIMESTAMP_LTZ:
case CXO_TRANSFORM_TIMESTAMP_TZ:
if (PyDateTime_Check(pyValue)) {
memset(&dbValue->asTimestamp, 0, sizeof(dbValue->asTimestamp));
dbValue->asTimestamp.year = PyDateTime_GET_YEAR(pyValue);
dbValue->asTimestamp.month = PyDateTime_GET_MONTH(pyValue);
dbValue->asTimestamp.day = PyDateTime_GET_DAY(pyValue);
dbValue->asTimestamp.hour = PyDateTime_DATE_GET_HOUR(pyValue);
dbValue->asTimestamp.minute =
PyDateTime_DATE_GET_MINUTE(pyValue);
dbValue->asTimestamp.second =
PyDateTime_DATE_GET_SECOND(pyValue);
dbValue->asTimestamp.fsecond =
PyDateTime_DATE_GET_MICROSECOND(pyValue) * 1000;
} else if (PyDate_Check(pyValue)) {
memset(&dbValue->asTimestamp, 0, sizeof(dbValue->asTimestamp));
dbValue->asTimestamp.year = PyDateTime_GET_YEAR(pyValue);
dbValue->asTimestamp.month = PyDateTime_GET_MONTH(pyValue);
dbValue->asTimestamp.day = PyDateTime_GET_DAY(pyValue);
} else {
PyErr_SetString(PyExc_TypeError, "expecting date or datetime");
return -1;
}
return 0;
case CXO_TRANSFORM_TIMEDELTA:
if (!PyDelta_Check(pyValue)) {
PyErr_SetString(PyExc_TypeError, "expecting timedelta");
return -1;
}
delta = (PyDateTime_Delta*) pyValue;
interval = &dbValue->asIntervalDS;
deltaSeconds = PyDateTime_DELTA_GET_SECONDS(delta);
interval->days = PyDateTime_DELTA_GET_DAYS(delta);
interval->hours = deltaSeconds / 3600;
interval->seconds = deltaSeconds % 3600;
interval->minutes = interval->seconds / 60;
interval->seconds = interval->seconds % 60;
interval->fseconds =
PyDateTime_DELTA_GET_MICROSECONDS(delta) * 1000;
return 0;
case CXO_TRANSFORM_JSON:
status = cxoJsonBuffer_fromObject(&jsonBuffer, pyValue);
if (status < 0) {
cxoJsonBuffer_free(&jsonBuffer);
return -1;
}
status = dpiJson_setValue(dbValue->asJson, &jsonBuffer.topNode);
cxoJsonBuffer_free(&jsonBuffer);
if (status < 0)
return cxoError_raiseAndReturnInt();
return 0;
default:
break;
}
cxoError_raiseFromString(cxoNotSupportedErrorException,
"Python value cannot be converted to a database value");
return -1;
}
//-----------------------------------------------------------------------------
// cxoTransform_getDefaultSize()
// Return the default size for the specified transform.
//-----------------------------------------------------------------------------
uint32_t cxoTransform_getDefaultSize(cxoTransformNum transformNum)
{
switch (transformNum) {
case CXO_TRANSFORM_NONE:
return 1;
case CXO_TRANSFORM_BINARY:
case CXO_TRANSFORM_NSTRING:
case CXO_TRANSFORM_STRING:
return 4000;
case CXO_TRANSFORM_DECIMAL:
case CXO_TRANSFORM_FLOAT:
case CXO_TRANSFORM_INT:
return 1000;
case CXO_TRANSFORM_FIXED_CHAR:
case CXO_TRANSFORM_FIXED_NCHAR:
return 2000;
case CXO_TRANSFORM_LONG_BINARY:
case CXO_TRANSFORM_LONG_STRING:
return 128 * 1024;
default:
break;
}
return 0;
}
//-----------------------------------------------------------------------------
// cxoTransform_getNumFromDataTypeInfo()
// Get the default transformation to use for the specified data type.
//-----------------------------------------------------------------------------
cxoTransformNum cxoTransform_getNumFromDataTypeInfo(dpiDataTypeInfo *info)
{
switch (info->oracleTypeNum) {
case DPI_ORACLE_TYPE_VARCHAR:
return CXO_TRANSFORM_STRING;
case DPI_ORACLE_TYPE_NVARCHAR:
return CXO_TRANSFORM_NSTRING;
case DPI_ORACLE_TYPE_CHAR:
return CXO_TRANSFORM_FIXED_CHAR;
case DPI_ORACLE_TYPE_NCHAR:
return CXO_TRANSFORM_FIXED_NCHAR;
case DPI_ORACLE_TYPE_ROWID:
return CXO_TRANSFORM_ROWID;
case DPI_ORACLE_TYPE_RAW:
return CXO_TRANSFORM_BINARY;
case DPI_ORACLE_TYPE_NATIVE_DOUBLE:
return CXO_TRANSFORM_NATIVE_DOUBLE;
case DPI_ORACLE_TYPE_NATIVE_FLOAT:
return CXO_TRANSFORM_NATIVE_FLOAT;
case DPI_ORACLE_TYPE_NUMBER:
if (info->scale == 0 ||
(info->scale == -127 && info->precision == 0))
return CXO_TRANSFORM_INT;
return CXO_TRANSFORM_FLOAT;
case DPI_ORACLE_TYPE_NATIVE_INT:
return CXO_TRANSFORM_NATIVE_INT;
case DPI_ORACLE_TYPE_DATE:
return CXO_TRANSFORM_DATETIME;
case DPI_ORACLE_TYPE_TIMESTAMP:
return CXO_TRANSFORM_TIMESTAMP;
case DPI_ORACLE_TYPE_TIMESTAMP_TZ:
return CXO_TRANSFORM_TIMESTAMP_TZ;
case DPI_ORACLE_TYPE_TIMESTAMP_LTZ:
return CXO_TRANSFORM_TIMESTAMP_LTZ;
case DPI_ORACLE_TYPE_INTERVAL_DS:
return CXO_TRANSFORM_TIMEDELTA;
case DPI_ORACLE_TYPE_CLOB:
return CXO_TRANSFORM_CLOB;
case DPI_ORACLE_TYPE_NCLOB:
return CXO_TRANSFORM_NCLOB;
case DPI_ORACLE_TYPE_BLOB:
return CXO_TRANSFORM_BLOB;
case DPI_ORACLE_TYPE_BFILE:
return CXO_TRANSFORM_BFILE;
case DPI_ORACLE_TYPE_STMT:
return CXO_TRANSFORM_CURSOR;
case DPI_ORACLE_TYPE_OBJECT:
return CXO_TRANSFORM_OBJECT;
case DPI_ORACLE_TYPE_LONG_VARCHAR:
return CXO_TRANSFORM_LONG_STRING;
case DPI_ORACLE_TYPE_LONG_RAW:
return CXO_TRANSFORM_LONG_BINARY;
case DPI_ORACLE_TYPE_BOOLEAN:
return CXO_TRANSFORM_BOOLEAN;
case DPI_ORACLE_TYPE_JSON:
return CXO_TRANSFORM_JSON;
default:
break;
}
return CXO_TRANSFORM_UNSUPPORTED;
}
//-----------------------------------------------------------------------------
// cxoTransform_getNumFromPythonType()
// Get the appropriate transformation to use for the specified Python type.
//-----------------------------------------------------------------------------
static cxoTransformNum cxoTransform_getNumFromPythonType(PyTypeObject *type)
{
if (type == &PyUnicode_Type)
return CXO_TRANSFORM_STRING;
if (type == &PyBytes_Type)
return CXO_TRANSFORM_BINARY;
if (type == &PyFloat_Type)
return CXO_TRANSFORM_FLOAT;
if (type == &PyLong_Type)
return CXO_TRANSFORM_INT;
if (type == cxoPyTypeDecimal)
return CXO_TRANSFORM_DECIMAL;
if (type == &PyBool_Type)
return CXO_TRANSFORM_BOOLEAN;
if (type == PyDateTimeAPI->DateType)
return CXO_TRANSFORM_DATE;
if (type == PyDateTimeAPI->DateTimeType)
return CXO_TRANSFORM_DATETIME;
if (type == PyDateTimeAPI->DeltaType)
return CXO_TRANSFORM_TIMEDELTA;
return CXO_TRANSFORM_UNSUPPORTED;
}
//-----------------------------------------------------------------------------
// cxoTransform_getNumFromPythonValue()
// Get the appropriate transformation to use for the specified Python value.
//-----------------------------------------------------------------------------
cxoTransformNum cxoTransform_getNumFromPythonValue(PyObject *value, int plsql)
{
cxoLob *lob;
if (value == Py_None)
return CXO_TRANSFORM_NONE;
if (PyBool_Check(value)) {
if (cxoClientVersionInfo.versionNum < 12 || !plsql)
return CXO_TRANSFORM_NATIVE_INT;
return CXO_TRANSFORM_BOOLEAN;
}
if (PyUnicode_Check(value))
return CXO_TRANSFORM_STRING;
if (PyBytes_Check(value))
return CXO_TRANSFORM_BINARY;
if (PyLong_Check(value))
return CXO_TRANSFORM_INT;
if (PyFloat_Check(value))
return CXO_TRANSFORM_FLOAT;
if (PyDateTime_Check(value))
return CXO_TRANSFORM_DATETIME;
if (PyDate_Check(value))
return CXO_TRANSFORM_DATE;
if (PyDelta_Check(value))
return CXO_TRANSFORM_TIMEDELTA;
if (PyObject_TypeCheck(value, &cxoPyTypeCursor))
return CXO_TRANSFORM_CURSOR;
if (PyObject_TypeCheck(value, cxoPyTypeDecimal))
return CXO_TRANSFORM_DECIMAL;
if (PyObject_TypeCheck(value, &cxoPyTypeObject))
return CXO_TRANSFORM_OBJECT;
if (PyObject_TypeCheck(value, &cxoPyTypeLob)) {
lob = (cxoLob*) value;
return lob->dbType->defaultTransformNum;
}
return CXO_TRANSFORM_UNSUPPORTED;
}
//-----------------------------------------------------------------------------
// cxoTransform_getNumFromType()
// Get the appropriate transformation to use for the specified type. This
// can be either a database type constant defined at the module level or a
// Python type.
//-----------------------------------------------------------------------------
int cxoTransform_getNumFromType(PyObject *type, cxoTransformNum *transformNum,
cxoObjectType **objType)
{
PyTypeObject *pyType;
cxoApiType *apiType;
cxoDbType *dbType;
char message[250];
int status;
// check to see if a database type constant has been specified
status = PyObject_IsInstance(type, (PyObject*) &cxoPyTypeDbType);
if (status < 0)
return -1;
if (status == 1) {
dbType = (cxoDbType*) type;
*transformNum = dbType->defaultTransformNum;
*objType = NULL;
return 0;
}
// check to see if a DB API type constant has been specified
status = PyObject_IsInstance(type, (PyObject*) &cxoPyTypeApiType);
if (status < 0)
return -1;
if (status == 1) {
apiType = (cxoApiType*) type;
*transformNum = apiType->defaultTransformNum;
*objType = NULL;
return 0;
}
// check to see if an object type has been specified
if (Py_TYPE(type) == &cxoPyTypeObjectType) {
*transformNum = CXO_TRANSFORM_OBJECT;
*objType = (cxoObjectType*) type;
return 0;
}
// check to see if a Python type has been specified
if (Py_TYPE(type) != &PyType_Type) {
PyErr_SetString(PyExc_TypeError, "expecting type");
return -1;
}
// check to see if the Python type is a supported type
pyType = (PyTypeObject*) type;
*objType = NULL;
*transformNum = cxoTransform_getNumFromPythonType(pyType);
if (*transformNum != CXO_TRANSFORM_UNSUPPORTED)
return 0;
// no valid type specified
snprintf(message, sizeof(message), "Python type %s not supported.",
pyType->tp_name);
cxoError_raiseFromString(cxoNotSupportedErrorException, message);
return -1;
}
//-----------------------------------------------------------------------------
// cxoTransform_getNumFromValue()
// Get the appropriate transformation to use for the specified value. If the
// value is an array, determine the transformation that can be used for all of
// the elements in that array.
//-----------------------------------------------------------------------------
int cxoTransform_getNumFromValue(PyObject *value, int *isArray,
Py_ssize_t *size, Py_ssize_t *numElements, int plsql,
cxoTransformNum *transformNum)
{
cxoTransformNum tempTransformNum;
PyObject *elementValue;
Py_ssize_t i, tempSize;
char message[250];
// initialization (except numElements which always has a valid value and is
// only overridden when a an array is encountered)
*size = 0;
*isArray = 0;
// handle arrays
if (PyList_Check(value)) {
*transformNum = CXO_TRANSFORM_NONE;
for (i = 0; i < PyList_GET_SIZE(value); i++) {
elementValue = PyList_GET_ITEM(value, i);
tempTransformNum = cxoTransform_getNumFromPythonValue(elementValue,
1);
if (tempTransformNum == CXO_TRANSFORM_UNSUPPORTED) {
snprintf(message, sizeof(message),
"element %u value of type %s is not supported",
(unsigned) i, Py_TYPE(value)->tp_name);
cxoError_raiseFromString(cxoNotSupportedErrorException,
message);
return -1;
} else if (*transformNum == CXO_TRANSFORM_NONE) {
*transformNum = tempTransformNum;
} else if (*transformNum != tempTransformNum) {
snprintf(message, sizeof(message),
"element %u value is not the same type as previous "
"elements", (unsigned) i);
cxoError_raiseFromString(cxoNotSupportedErrorException,
message);
return -1;
}
tempSize = cxoTransform_calculateSize(elementValue, *transformNum);
if (tempSize > *size)
*size = tempSize;
}
*isArray = 1;
*numElements = PyList_GET_SIZE(value);
return 0;
}
// handle scalar values
*transformNum = cxoTransform_getNumFromPythonValue(value, plsql);
if (*transformNum == CXO_TRANSFORM_UNSUPPORTED) {
snprintf(message, sizeof(message),
"Python value of type %s not supported.",
Py_TYPE(value)->tp_name);
cxoError_raiseFromString(cxoNotSupportedErrorException, message);
return -1;
}
*size = cxoTransform_calculateSize(value, *transformNum);
return 0;
}
//-----------------------------------------------------------------------------
// cxoTransform_getTypeInfo()
// Get type information for the specified transform. The transform number is
// assumed to be a valid value at this point (not CXO_TRANSFORM_UNSUPPORTED).
//-----------------------------------------------------------------------------
void cxoTransform_getTypeInfo(cxoTransformNum transformNum,
dpiOracleTypeNum *oracleTypeNum, dpiNativeTypeNum *nativeTypeNum)
{
const cxoTransform *transform;
transform = &cxoAllTransforms[transformNum];
*oracleTypeNum = transform->oracleTypeNum;
*nativeTypeNum = transform->nativeTypeNum;
}
//-----------------------------------------------------------------------------
// cxoTransform_init()
// Import the necessary modules for performing transformations.
//-----------------------------------------------------------------------------
int cxoTransform_init(void)
{
PyObject *module;
// import the datetime module for datetime support
PyDateTime_IMPORT;
if (PyErr_Occurred())
return -1;
cxoPyTypeDate = PyDateTimeAPI->DateType;
cxoPyTypeDateTime = PyDateTimeAPI->DateTimeType;
// import the decimal module for decimal support
module = PyImport_ImportModule("decimal");
if (!module)
return -1;
cxoPyTypeDecimal =
(PyTypeObject*) PyObject_GetAttrString(module, "Decimal");
Py_DECREF(module);
if (!cxoPyTypeDecimal)
return -1;
return 0;
}
//-----------------------------------------------------------------------------
// cxoTransform_timestampFromTicks()
// Creates a timestamp from ticks (number of seconds since Unix epoch).
//-----------------------------------------------------------------------------
PyObject *cxoTransform_timestampFromTicks(PyObject *args)
{
return PyDateTime_FromTimestamp(args);
}
//-----------------------------------------------------------------------------
// cxoTransform_toPython()
// Transforms a database value into its corresponding Python object.
//-----------------------------------------------------------------------------
PyObject *cxoTransform_toPython(cxoTransformNum transformNum,
cxoConnection *connection, cxoObjectType *objType,
dpiDataBuffer *dbValue, const char *encodingErrors)
{
PyObject *stringObj, *result;
dpiIntervalDS *intervalDS;
dpiTimestamp *timestamp;
dpiJsonNode *jsonNode;
uint32_t rowidLength;
cxoDbType *dbType;
const char *rowid;
cxoCursor *cursor;
dpiBytes *bytes;
int32_t seconds;
switch (transformNum) {
case CXO_TRANSFORM_BINARY:
case CXO_TRANSFORM_LONG_BINARY:
bytes = &dbValue->asBytes;
return PyBytes_FromStringAndSize(bytes->ptr, bytes->length);
case CXO_TRANSFORM_BFILE:
case CXO_TRANSFORM_BLOB:
case CXO_TRANSFORM_CLOB:
case CXO_TRANSFORM_NCLOB:
dbType = cxoDbType_fromTransformNum(transformNum);
return cxoLob_new(connection, dbType, dbValue->asLOB);
case CXO_TRANSFORM_BOOLEAN:
if (dbValue->asBoolean)
Py_RETURN_TRUE;
Py_RETURN_FALSE;
case CXO_TRANSFORM_CURSOR:
cursor = (cxoCursor*) PyObject_CallMethod((PyObject*) connection,
"cursor", NULL);
if (!cursor)
return NULL;
cursor->handle = dbValue->asStmt;
dpiStmt_addRef(cursor->handle);
cursor->fixupRefCursor = 1;
return (PyObject*) cursor;
case CXO_TRANSFORM_DATE:
timestamp = &dbValue->asTimestamp;
return PyDate_FromDate(timestamp->year, timestamp->month,
timestamp->day);
case CXO_TRANSFORM_DATETIME:
case CXO_TRANSFORM_TIMESTAMP:
case CXO_TRANSFORM_TIMESTAMP_LTZ:
case CXO_TRANSFORM_TIMESTAMP_TZ:
timestamp = &dbValue->asTimestamp;
return PyDateTime_FromDateAndTime(timestamp->year,
timestamp->month, timestamp->day, timestamp->hour,
timestamp->minute, timestamp->second,
timestamp->fsecond / 1000);
case CXO_TRANSFORM_FIXED_CHAR:
case CXO_TRANSFORM_FIXED_NCHAR:
case CXO_TRANSFORM_LONG_STRING:
case CXO_TRANSFORM_NSTRING:
case CXO_TRANSFORM_STRING:
bytes = &dbValue->asBytes;
return PyUnicode_Decode(bytes->ptr, bytes->length, bytes->encoding,
encodingErrors);
case CXO_TRANSFORM_NATIVE_DOUBLE:
return PyFloat_FromDouble(dbValue->asDouble);
case CXO_TRANSFORM_NATIVE_FLOAT:
return PyFloat_FromDouble(dbValue->asFloat);
case CXO_TRANSFORM_NATIVE_INT:
return PyLong_FromLongLong(dbValue->asInt64);
case CXO_TRANSFORM_DECIMAL:
case CXO_TRANSFORM_INT:
case CXO_TRANSFORM_FLOAT:
bytes = &dbValue->asBytes;
stringObj = PyUnicode_Decode(bytes->ptr, bytes->length,
bytes->encoding, encodingErrors);
if (!stringObj)
return NULL;
if (transformNum == CXO_TRANSFORM_INT &&
memchr(bytes->ptr, '.', bytes->length) == NULL) {
result = PyNumber_Long(stringObj);
} else if (transformNum == CXO_TRANSFORM_DECIMAL) {
result = PyObject_CallFunctionObjArgs(
(PyObject*) cxoPyTypeDecimal, stringObj, NULL);
} else {
result = PyNumber_Float(stringObj);
}
Py_DECREF(stringObj);
return result;
case CXO_TRANSFORM_OBJECT:
return cxoObject_new(objType, dbValue->asObject);
case CXO_TRANSFORM_ROWID:
if (dpiRowid_getStringValue(dbValue->asRowid, &rowid,
&rowidLength) < 0)
return cxoError_raiseAndReturnNull();
return PyUnicode_Decode(rowid, rowidLength,
connection->encodingInfo.encoding, NULL);
case CXO_TRANSFORM_JSON:
if (dpiJson_getValue(dbValue->asJson,
DPI_JSON_OPT_NUMBER_AS_STRING, &jsonNode) < 0)
return cxoError_raiseAndReturnNull();
return cxoTransform_toPythonFromJson(connection, jsonNode,
encodingErrors);
case CXO_TRANSFORM_TIMEDELTA:
intervalDS = &dbValue->asIntervalDS;
seconds = intervalDS->hours * 60 * 60 + intervalDS->minutes * 60 +
intervalDS->seconds;
return PyDelta_FromDSU(intervalDS->days, seconds,
intervalDS->fseconds / 1000);
default:
break;
}
return cxoError_raiseFromString(cxoNotSupportedErrorException,
"Database value cannot be converted to a Python value");
}
//-----------------------------------------------------------------------------
// cxoTransform_toPythonFromJson()
// Transforms a JSON node to its equivalent Python value.
//-----------------------------------------------------------------------------
static PyObject *cxoTransform_toPythonFromJson(cxoConnection *connection,
dpiJsonNode *node, const char *encodingErrors)
{
PyObject *result, *temp, *name;
cxoTransformNum transformNum;
dpiJsonArray *array;
dpiJsonObject *obj;
uint32_t i;
// null is a special case
if (node->nativeTypeNum == DPI_NATIVE_TYPE_NULL)
Py_RETURN_NONE;
switch (node->oracleTypeNum) {
case DPI_ORACLE_TYPE_NUMBER:
transformNum = (node->nativeTypeNum == DPI_NATIVE_TYPE_DOUBLE) ?
CXO_TRANSFORM_NATIVE_DOUBLE : CXO_TRANSFORM_DECIMAL;
break;
case DPI_ORACLE_TYPE_VARCHAR:
transformNum = CXO_TRANSFORM_STRING;
break;
case DPI_ORACLE_TYPE_RAW:
transformNum = CXO_TRANSFORM_BINARY;
break;
case DPI_ORACLE_TYPE_DATE:
case DPI_ORACLE_TYPE_TIMESTAMP:
transformNum = CXO_TRANSFORM_DATETIME;
break;
case DPI_ORACLE_TYPE_BOOLEAN:
transformNum = CXO_TRANSFORM_BOOLEAN;
break;
case DPI_ORACLE_TYPE_INTERVAL_DS:
transformNum = CXO_TRANSFORM_TIMEDELTA;
break;
case DPI_ORACLE_TYPE_JSON_OBJECT:
obj = &node->value->asJsonObject;
result = PyDict_New();
for (i = 0; i < obj->numFields; i++) {
name = PyUnicode_DecodeUTF8(obj->fieldNames[i],
obj->fieldNameLengths[i], NULL);
if (!name)
return NULL;
temp = cxoTransform_toPythonFromJson(connection,
&obj->fields[i], encodingErrors);
if (!temp)
return NULL;
if (PyDict_SetItem(result, name, temp) < 0) {
Py_DECREF(name);
Py_DECREF(temp);
return NULL;
}
Py_DECREF(name);
Py_DECREF(temp);
}
return result;
case DPI_ORACLE_TYPE_JSON_ARRAY:
array = &node->value->asJsonArray;
result = PyList_New(array->numElements);
for (i = 0; i < array->numElements; i++) {
temp = cxoTransform_toPythonFromJson(connection,
&array->elements[i], encodingErrors);
if (!temp) {
Py_DECREF(result);
return NULL;
}
PyList_SET_ITEM(result, i, temp);
}
return result;
default:
transformNum = CXO_TRANSFORM_UNSUPPORTED;
}
return cxoTransform_toPython(transformNum, connection, NULL,
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