/*
* record_send - binary output routine for any composite type.
*/
Datum
record_send(PG_FUNCTION_ARGS)
{
HeapTupleHeader rec = PG_GETARG_HEAPTUPLEHEADER(0);
Oid tupType;
int32 tupTypmod;
TupleDesc tupdesc;
HeapTupleData tuple;
RecordIOData *my_extra;
int ncolumns;
int validcols;
int i;
Datum *values;
char *nulls;
StringInfoData buf;
/* Extract type info from the tuple itself */
tupType = HeapTupleHeaderGetTypeId(rec);
tupTypmod = HeapTupleHeaderGetTypMod(rec);
tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
ncolumns = tupdesc->natts;
/* Build a temporary HeapTuple control structure */
tuple.t_len = HeapTupleHeaderGetDatumLength(rec);
ItemPointerSetInvalid(&(tuple.t_self));
tuple.t_tableOid = InvalidOid;
tuple.t_data = rec;
/*
* We arrange to look up the needed I/O info just once per series of
* calls, assuming the record type doesn't change underneath us.
*/
my_extra = (RecordIOData *) fcinfo->flinfo->fn_extra;
if (my_extra == NULL ||
my_extra->ncolumns != ncolumns)
{
fcinfo->flinfo->fn_extra =
MemoryContextAlloc(fcinfo->flinfo->fn_mcxt,
sizeof(RecordIOData) - sizeof(ColumnIOData)
+ ncolumns * sizeof(ColumnIOData));
my_extra = (RecordIOData *) fcinfo->flinfo->fn_extra;
my_extra->record_type = InvalidOid;
my_extra->record_typmod = 0;
}
if (my_extra->record_type != tupType ||
my_extra->record_typmod != tupTypmod)
{
MemSet(my_extra, 0,
sizeof(RecordIOData) - sizeof(ColumnIOData)
+ ncolumns * sizeof(ColumnIOData));
my_extra->record_type = tupType;
my_extra->record_typmod = tupTypmod;
my_extra->ncolumns = ncolumns;
}
values = (Datum *) palloc(ncolumns * sizeof(Datum));
nulls = (char *) palloc(ncolumns * sizeof(char));
/* Break down the tuple into fields */
heap_deformtuple(&tuple, tupdesc, values, nulls);
/* And build the result string */
pq_begintypsend(&buf);
/* Need to scan to count nondeleted columns */
validcols = 0;
for (i = 0; i < ncolumns; i++)
{
if (!tupdesc->attrs[i]->attisdropped)
validcols++;
}
pq_sendint(&buf, validcols, 4);
for (i = 0; i < ncolumns; i++)
{
ColumnIOData *column_info = &my_extra->columns[i];
Oid column_type = tupdesc->attrs[i]->atttypid;
bytea *outputbytes;
/* Ignore dropped columns in datatype */
if (tupdesc->attrs[i]->attisdropped)
continue;
pq_sendint(&buf, column_type, sizeof(Oid));
if (nulls[i] == 'n')
{
/* emit -1 data length to signify a NULL */
pq_sendint(&buf, -1, 4);
continue;
}
/*
* Convert the column value to binary
*/
if (column_info->column_type != column_type)
{
bool typIsVarlena;
getTypeBinaryOutputInfo(column_type,
&column_info->typiofunc,
&typIsVarlena);
fmgr_info_cxt(column_info->typiofunc, &column_info->proc,
fcinfo->flinfo->fn_mcxt);
column_info->column_type = column_type;
}
outputbytes = SendFunctionCall(&column_info->proc, values[i]);
/* We assume the result will not have been toasted */
pq_sendint(&buf, VARSIZE(outputbytes) - VARHDRSZ, 4);
pq_sendbytes(&buf, VARDATA(outputbytes),
VARSIZE(outputbytes) - VARHDRSZ);
pfree(outputbytes);
}
pfree(values);
pfree(nulls);
ReleaseTupleDesc(tupdesc);
PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}
HeapTuple
SPI_modifytuple(Relation rel, HeapTuple tuple, int natts, int *attnum,
Datum *Values, const char *Nulls)
{
MemoryContext oldcxt = NULL;
HeapTuple mtuple;
int numberOfAttributes;
Datum *v;
char *n;
int i;
if (rel == NULL || tuple == NULL || natts < 0 || attnum == NULL || Values == NULL)
{
SPI_result = SPI_ERROR_ARGUMENT;
return NULL;
}
if (_SPI_curid + 1 == _SPI_connected) /* connected */
{
if (_SPI_current != &(_SPI_stack[_SPI_curid + 1]))
elog(ERROR, "SPI stack corrupted");
oldcxt = MemoryContextSwitchTo(_SPI_current->savedcxt);
}
SPI_result = 0;
numberOfAttributes = rel->rd_att->natts;
v = (Datum *) palloc(numberOfAttributes * sizeof(Datum));
n = (char *) palloc(numberOfAttributes * sizeof(char));
/* fetch old values and nulls */
heap_deformtuple(tuple, rel->rd_att, v, n);
/* replace values and nulls */
for (i = 0; i < natts; i++)
{
if (attnum[i] <= 0 || attnum[i] > numberOfAttributes)
break;
v[attnum[i] - 1] = Values[i];
n[attnum[i] - 1] = (Nulls && Nulls[i] == 'n') ? 'n' : ' ';
}
if (i == natts) /* no errors in *attnum */
{
mtuple = heap_formtuple(rel->rd_att, v, n);
/*
* copy the identification info of the old tuple: t_ctid, t_self, and
* OID (if any)
*/
mtuple->t_data->t_ctid = tuple->t_data->t_ctid;
mtuple->t_self = tuple->t_self;
mtuple->t_tableOid = tuple->t_tableOid;
if (rel->rd_att->tdhasoid)
HeapTupleSetOid(mtuple, HeapTupleGetOid(tuple));
}
else
{
mtuple = NULL;
SPI_result = SPI_ERROR_NOATTRIBUTE;
}
pfree(v);
pfree(n);
if (oldcxt)
MemoryContextSwitchTo(oldcxt);
return mtuple;
}
/*
* record_out - output routine for any composite type.
*/
Datum
record_out(PG_FUNCTION_ARGS)
{
HeapTupleHeader rec = PG_GETARG_HEAPTUPLEHEADER(0);
Oid tupType;
int32 tupTypmod;
TupleDesc tupdesc;
HeapTupleData tuple;
RecordIOData *my_extra;
bool needComma = false;
int ncolumns;
int i;
Datum *values;
char *nulls;
StringInfoData buf;
/* Extract type info from the tuple itself */
tupType = HeapTupleHeaderGetTypeId(rec);
tupTypmod = HeapTupleHeaderGetTypMod(rec);
tupdesc = lookup_rowtype_tupdesc(tupType, tupTypmod);
ncolumns = tupdesc->natts;
/* Build a temporary HeapTuple control structure */
tuple.t_len = HeapTupleHeaderGetDatumLength(rec);
ItemPointerSetInvalid(&(tuple.t_self));
tuple.t_tableOid = InvalidOid;
tuple.t_data = rec;
/*
* We arrange to look up the needed I/O info just once per series of
* calls, assuming the record type doesn't change underneath us.
*/
my_extra = (RecordIOData *) fcinfo->flinfo->fn_extra;
if (my_extra == NULL ||
my_extra->ncolumns != ncolumns)
{
fcinfo->flinfo->fn_extra =
MemoryContextAlloc(fcinfo->flinfo->fn_mcxt,
sizeof(RecordIOData) - sizeof(ColumnIOData)
+ ncolumns * sizeof(ColumnIOData));
my_extra = (RecordIOData *) fcinfo->flinfo->fn_extra;
my_extra->record_type = InvalidOid;
my_extra->record_typmod = 0;
}
if (my_extra->record_type != tupType ||
my_extra->record_typmod != tupTypmod)
{
MemSet(my_extra, 0,
sizeof(RecordIOData) - sizeof(ColumnIOData)
+ ncolumns * sizeof(ColumnIOData));
my_extra->record_type = tupType;
my_extra->record_typmod = tupTypmod;
my_extra->ncolumns = ncolumns;
}
values = (Datum *) palloc(ncolumns * sizeof(Datum));
nulls = (char *) palloc(ncolumns * sizeof(char));
/* Break down the tuple into fields */
heap_deformtuple(&tuple, tupdesc, values, nulls);
/* And build the result string */
initStringInfo(&buf);
appendStringInfoChar(&buf, '(');
for (i = 0; i < ncolumns; i++)
{
ColumnIOData *column_info = &my_extra->columns[i];
Oid column_type = tupdesc->attrs[i]->atttypid;
char *value;
char *tmp;
bool nq;
/* Ignore dropped columns in datatype */
if (tupdesc->attrs[i]->attisdropped)
continue;
if (needComma)
appendStringInfoChar(&buf, ',');
needComma = true;
if (nulls[i] == 'n')
{
/* emit nothing... */
continue;
}
/*
* Convert the column value to text
*/
if (column_info->column_type != column_type)
{
bool typIsVarlena;
getTypeOutputInfo(column_type,
&column_info->typiofunc,
&typIsVarlena);
fmgr_info_cxt(column_info->typiofunc, &column_info->proc,
fcinfo->flinfo->fn_mcxt);
column_info->column_type = column_type;
}
value = OutputFunctionCall(&column_info->proc, values[i]);
/* Detect whether we need double quotes for this value */
nq = (value[0] == '\0'); /* force quotes for empty string */
for (tmp = value; *tmp; tmp++)
{
char ch = *tmp;
if (ch == '"' || ch == '\\' ||
ch == '(' || ch == ')' || ch == ',' ||
isspace((unsigned char) ch))
{
nq = true;
break;
}
}
/* And emit the string */
if (nq)
appendStringInfoChar(&buf, '"');
for (tmp = value; *tmp; tmp++)
{
char ch = *tmp;
if (ch == '"' || ch == '\\')
appendStringInfoChar(&buf, ch);
appendStringInfoChar(&buf, ch);
}
if (nq)
appendStringInfoChar(&buf, '"');
}
appendStringInfoChar(&buf, ')');
pfree(values);
pfree(nulls);
ReleaseTupleDesc(tupdesc);
PG_RETURN_CSTRING(buf.data);
}
