/**********************************************************************
* plpython.c - python as a procedural language for PostgreSQL
*
- * $PostgreSQL: pgsql/src/pl/plpython/plpython.c,v 1.78 2006/04/27 01:05:05 momjian Exp $
+ * $PostgreSQL: pgsql/src/pl/plpython/plpython.c,v 1.79 2006/04/27 14:18:07 momjian Exp $
*
*********************************************************************
*/
#include "catalog/pg_type.h"
#include "commands/trigger.h"
#include "executor/spi.h"
-#include "funcapi.h"
#include "fmgr.h"
#include "nodes/makefuncs.h"
#include "parser/parse_type.h"
bool fn_readonly;
PLyTypeInfo result; /* also used to store info for trigger tuple
* type */
- bool is_setof; /* true, if procedure returns result set */
- PyObject *setof; /* contents of result set. */
- int setof_count; /* numbef of items to return in result set */
- int setof_current; /* current item in result set */
- char **argnames; /* Argument names */
PLyTypeInfo args[FUNC_MAX_ARGS];
int nargs;
PyObject *code; /* compiled procedure code */
static HeapTuple PLy_trigger_handler(FunctionCallInfo fcinfo, PLyProcedure *);
static PyObject *PLy_function_build_args(FunctionCallInfo fcinfo, PLyProcedure *);
-static void PLy_function_delete_args(PLyProcedure *);
static PyObject *PLy_trigger_build_args(FunctionCallInfo fcinfo, PLyProcedure *,
HeapTuple *);
static HeapTuple PLy_modify_tuple(PLyProcedure *, PyObject *,
static PyObject *PLyInt_FromString(const char *);
static PyObject *PLyLong_FromString(const char *);
static PyObject *PLyString_FromString(const char *);
-static HeapTuple PLyDict_ToTuple(PLyTypeInfo *, PyObject *);
/* global data */
PG_TRY();
{
- if (!proc->is_setof || proc->setof_count == -1)
- {
- /* python function not called yet, do it */
- plargs = PLy_function_build_args(fcinfo, proc);
- plrv = PLy_procedure_call(proc, "args", plargs);
- if (!proc->is_setof)
- /* SETOF function parameters are deleted when called last row is returned */
- PLy_function_delete_args(proc);
- Assert(plrv != NULL);
- Assert(!PLy_error_in_progress);
- }
+ plargs = PLy_function_build_args(fcinfo, proc);
+ plrv = PLy_procedure_call(proc, "args", plargs);
+
+ Assert(plrv != NULL);
+ Assert(!PLy_error_in_progress);
/*
* Disconnect from SPI manager and then create the return values datum
if (SPI_finish() != SPI_OK_FINISH)
elog(ERROR, "SPI_finish failed");
- if (proc->is_setof)
- {
- bool is_done = false;
- ReturnSetInfo *rsi = (ReturnSetInfo *)fcinfo->resultinfo;
-
- if (proc->setof_current == -1)
- {
- /* first time -- do checks and setup */
- if (!rsi || !IsA(rsi, ReturnSetInfo) ||
- (rsi->allowedModes & SFRM_ValuePerCall) == 0)
- {
- ereport(ERROR,
- (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
- errmsg("only value per call is allowed")));
- }
- rsi->returnMode = SFRM_ValuePerCall;
-
- /* fetch information about returned object */
- proc->setof = plrv;
- plrv = NULL;
- if (PyList_Check(proc->setof))
- /* SETOF as list */
- proc->setof_count = PyList_GET_SIZE(proc->setof);
- else if (PyIter_Check(proc->setof))
- /* SETOF as iterator, unknown number of items */
- proc->setof_current = proc->setof_count = 0;
- else
- {
- ereport(ERROR,
- (errcode(ERRCODE_INVALID_BINARY_REPRESENTATION),
- errmsg("SETOF must be returned as list or iterator")));
- }
- }
-
- Assert(proc->setof != NULL);
-
- /* Fetch next of SETOF */
- if (PyList_Check(proc->setof))
- {
- is_done = ++proc->setof_current == proc->setof_count;
- if (!is_done)
- plrv = PyList_GET_ITEM(proc->setof, proc->setof_current);
- }
- else if (PyIter_Check(proc->setof))
- {
- plrv = PyIter_Next(proc->setof);
- is_done = plrv == NULL;
- }
-
- if (!is_done)
- {
- rsi->isDone = ExprMultipleResult;
- }
- else
- {
- rsi->isDone = ExprEndResult;
- proc->setof_count = proc->setof_current = -1;
- Py_DECREF(proc->setof);
- proc->setof = NULL;
-
- Py_XDECREF(plargs);
- Py_XDECREF(plrv);
- Py_XDECREF(plrv_so);
-
- PLy_function_delete_args(proc);
- fcinfo->isnull = true;
- return (Datum)NULL;
- }
- }
-
/*
* If the function is declared to return void, the Python
* return value must be None. For void-returning functions, we
proc->result.out.d.typioparam,
-1);
}
- else if (proc->result.is_rowtype >= 1)
- {
- HeapTuple tuple;
-
- /* returning composite type */
- if (!PyDict_Check(plrv))
- elog(ERROR, "tuple must be returned as dictionary");
-
- tuple = PLyDict_ToTuple(&proc->result, plrv);
- if (tuple != NULL)
- {
- fcinfo->isnull = false;
- rv = HeapTupleGetDatum(tuple);
- }
- else
- {
- fcinfo->isnull = true;
- rv = (Datum) NULL;
- }
- }
else
{
fcinfo->isnull = false;
* FIXME -- error check this
*/
PyList_SetItem(args, i, arg);
- PyDict_SetItemString(proc->globals, proc->argnames[i], arg);
arg = NULL;
}
}
}
-static void
-PLy_function_delete_args(PLyProcedure *proc)
-{
- int i;
-
- for (i = 0; i < proc->nargs; i++)
- PyDict_DelItemString(proc->globals, proc->argnames[i]);
-}
-
-
/*
* PLyProcedure functions
*/
bool isnull;
int i,
rv;
- Datum argnames;
- Datum *elems;
- int nelems;
procStruct = (Form_pg_proc) GETSTRUCT(procTup);
proc->nargs = 0;
proc->code = proc->statics = NULL;
proc->globals = proc->me = NULL;
- proc->is_setof = procStruct->proretset;
- proc->setof = NULL;
- proc->setof_count = proc->setof_current = -1;
- proc->argnames = NULL;
PG_TRY();
{
}
if (rvTypeStruct->typtype == 'c')
- {
- /* Tuple: set up later, during first call to PLy_function_handler */
- proc->result.out.d.typoid = procStruct->prorettype;
- proc->result.is_rowtype = 2;
- }
+ ereport(ERROR,
+ (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+ errmsg("plpython functions cannot return tuples yet")));
else
PLy_output_datum_func(&proc->result, rvTypeTup);
* arguments.
*/
proc->nargs = fcinfo->nargs;
- proc->argnames = NULL;
- if (proc->nargs)
- {
- argnames = SysCacheGetAttr(PROCOID, procTup, Anum_pg_proc_proargnames, &isnull);
- if (!isnull)
- {
- deconstruct_array(DatumGetArrayTypeP(argnames), TEXTOID, -1, false, 'i',
- &elems, NULL, &nelems);
- if (nelems != proc->nargs)
- elog(ERROR,
- "proargnames must have the same number of elements "
- "as the function has arguments");
- proc->argnames = (char **) PLy_malloc(sizeof(char *)*proc->nargs);
- }
- }
for (i = 0; i < fcinfo->nargs; i++)
{
HeapTuple argTypeTup;
proc->args[i].is_rowtype = 2; /* still need to set I/O funcs */
ReleaseSysCache(argTypeTup);
-
- /* Fetch argument name */
- if (proc->argnames)
- proc->argnames[i] = PLy_strdup(DatumGetCString(DirectFunctionCall1(textout, elems[i])));
}
+
/*
* get the text of the function.
*/
if (proc->pyname)
PLy_free(proc->pyname);
for (i = 0; i < proc->nargs; i++)
- {
if (proc->args[i].is_rowtype == 1)
{
if (proc->args[i].in.r.atts)
if (proc->args[i].out.r.atts)
PLy_free(proc->args[i].out.r.atts);
}
- if (proc->argnames && proc->argnames[i])
- PLy_free(proc->argnames[i]);
- }
- if (proc->argnames)
- PLy_free(proc->argnames);
}
/* conversion functions. remember output from python is
return dict;
}
-
-static HeapTuple
-PLyDict_ToTuple(PLyTypeInfo *info, PyObject *dict)
-{
- TupleDesc desc;
- HeapTuple tuple;
- Datum *values;
- char *nulls;
- int i;
-
- desc = CreateTupleDescCopy(lookup_rowtype_tupdesc(info->out.d.typoid, -1));
-
- /* Set up tuple type, if neccessary */
- if (info->is_rowtype == 2)
- {
- PLy_output_tuple_funcs(info, desc);
- info->is_rowtype = 1;
- }
- Assert(info->is_rowtype == 1);
-
- /* Build tuple */
- values = palloc(sizeof(Datum)*desc->natts);
- nulls = palloc(sizeof(char)*desc->natts);
- for (i = 0; i < desc->natts; ++i)
- {
- char *key;
- PyObject *value,
- *so;
-
- key = NameStr(desc->attrs[i]->attname);
- value = so = NULL;
- PG_TRY();
- {
- value = PyDict_GetItemString(dict, key);
- if (value != Py_None && value != NULL)
- {
- char *valuestr;
-
- so = PyObject_Str(value);
- valuestr = PyString_AsString(so);
- values[i] = InputFunctionCall(&info->out.r.atts[i].typfunc
- , valuestr
- , info->out.r.atts[i].typioparam
- , -1);
- Py_DECREF(so);
- value = so = NULL;
- nulls[i] = ' ';
- }
- else
- {
- value = NULL;
- values[i] = (Datum) NULL;
- nulls[i] = 'n';
- }
- }
- PG_CATCH();
- {
- Py_XDECREF(value);
- Py_XDECREF(so);
- PG_RE_THROW();
- }
- PG_END_TRY();
- }
-
- tuple = heap_formtuple(desc, values, nulls);
- FreeTupleDesc(desc);
- pfree(values);
- pfree(nulls);
-
- return tuple;
-}
-
/* initialization, some python variables function declared here */
/* interface to postgresql elog */
{
free(ptr);
}
-/* vim: set noexpandtab nosmarttab shiftwidth=8 cinoptions=l1j1: */
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