HackBase/python-cx_Oracle
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Add support for acquiring cursor.description after a parse.

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This commit is contained in:
Anthony Tuininga 2007-10-24 20:52:29 +00:00
parent 1cea81e08d
commit 09d5ba4c25
1 changed files with 31 additions and 11 deletions
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42
Cursor.c
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@ -602,9 +602,10 @@ static PyObject *Cursor_ItemDescriptionHelper(
unsigned pos, // position in description
OCIParam *param) // parameter to use for description
{
PyObject *tuple, *var, *type;
ub2 internalSize, sqlDataType;
udt_VariableType *varType;
int displaySize, index;
ub2 internalSize;
PyObject *tuple, *type;
ub4 nameLength;
sb2 precision;
sword status;
@ -612,6 +613,18 @@ static PyObject *Cursor_ItemDescriptionHelper(
ub1 nullOk;
sb1 scale;
// acquire type of item
status = OCIAttrGet(param, OCI_HTYPE_DESCRIBE, (dvoid*) &sqlDataType, 0,
OCI_ATTR_DATA_TYPE, self->environment->errorHandle);
if (Environment_CheckForError(self->environment, status,
"Cursor_ItemDescription(): data type") < 0)
return NULL;
// acquire usable type of item
varType = Variable_TypeByOracleDataType(sqlDataType, SQLCS_IMPLICIT);
if (!varType)
return NULL;
// acquire internal size of item
status = OCIAttrGet(param, OCI_HTYPE_DESCRIBE, (dvoid*) &internalSize, 0,
OCI_ATTR_DATA_SIZE, self->environment->errorHandle);
@ -629,8 +642,7 @@ static PyObject *Cursor_ItemDescriptionHelper(
// lookup precision and scale
scale = 0;
precision = 0;
var = PyList_GET_ITEM(self->fetchVariables, pos - 1);
if (var->ob_type == &g_NumberVarType) {
if (varType->pythonType == &g_NumberVarType) {
status = OCIAttrGet(param, OCI_HTYPE_DESCRIBE, (dvoid*) &scale, 0,
OCI_ATTR_SCALE, self->environment->errorHandle);
if (Environment_CheckForError(self->environment, status,
@ -651,7 +663,7 @@ static PyObject *Cursor_ItemDescriptionHelper(
return NULL;
// set display size based on data type
type = (PyObject*) var->ob_type;
type = (PyObject*) varType->pythonType;
if (type == (PyObject*) &g_StringVarType)
displaySize = internalSize;
else if (type == (PyObject*) &g_BinaryVarType)
@ -740,6 +752,7 @@ static PyObject *Cursor_GetDescription(
{
PyObject *results, *tuple;
int numItems, index;
sword status;
// make sure the cursor is open
if (Cursor_IsOpen(self) < 0)
@ -749,14 +762,20 @@ static PyObject *Cursor_GetDescription(
if (Cursor_FixupBoundCursor(self) < 0)
return NULL;
// if no statement has been executed yet, return None
if (!self->fetchVariables) {
// if not a query, return None
if (self->statementType != OCI_STMT_SELECT) {
Py_INCREF(Py_None);
return Py_None;
}
// determine number of items in select-list
status = OCIAttrGet(self->handle, OCI_HTYPE_STMT, (dvoid*) &numItems, 0,
OCI_ATTR_PARAM_COUNT, self->environment->errorHandle);
if (Environment_CheckForError(self->environment, status,
"Cursor_GetDescription()") < 0)
return NULL;
// create a list of the required length
numItems = PyList_GET_SIZE(self->fetchVariables);
results = PyList_New(numItems);
if (!results)
return NULL;
@ -1161,10 +1180,11 @@ static int Cursor_InternalPrepare(
//-----------------------------------------------------------------------------
// Cursor_Parse()
// Parse the statement without executing it.
// Parse the statement without executing it. This also retrieves information
// about the select list for select statements.
//-----------------------------------------------------------------------------
static PyObject *Cursor_Parse(
udt_Cursor *self, // cursor to perform prepare on
udt_Cursor *self, // cursor to perform parse on
PyObject *args) // arguments
{
PyObject *statement;
@ -1185,7 +1205,7 @@ static PyObject *Cursor_Parse(
// parse the statement
Py_BEGIN_ALLOW_THREADS
status = OCIStmtExecute(self->connection->handle, self->handle,
self->environment->errorHandle, 0, 0, 0, 0, OCI_PARSE_ONLY);
self->environment->errorHandle, 0, 0, 0, 0, OCI_DESCRIBE_ONLY);
Py_END_ALLOW_THREADS
if (Environment_CheckForError(self->environment, status,
"Cursor_Parse()") < 0)