Hi, I wanna return a group of rows, like when you do "SELECT columns FROM table", but I'm getting some troubles, I don't know if I have to use HeapTuple or Datum. I'm using bison to parse sqlf to sql this way:
-- some code
p, li { white-space: pre-wrap; }
%%
query: /* empty string */
| query command
;
command: '\n'
| CreateFuzzyPredStmt
| DropFuzzyPredStmt
| SelectStmt
{
int i;
*((void **)result) = return_query(fuzzy_query[real_length-1]);
for (i=0;i<real_length;i++)
pfree(fuzzy_query[i]);
}
| error '\n' { yyerrok;}
;
-- some code
p, li { white-space: pre-wrap; }
HeapTuple
return_query(char *str){
HeapTuple rettuple;
int ret, proc;
SPI_connect();
ret=SPI_execute(str,true,1);
proc=SPI_processed;
p, li { white-space: pre-wrap; }
if (ret > 0 && SPI_tuptable != NULL){
SPITupleTable *tuptable = SPI_tuptable;
rettuple = tuptable->vals;
}
SPI_finish();
return rettuple;
}
This I have the function:
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#include "postgres.h"
#include "fmgr.h"
#include "gram.h"
#include "utils/builtins.h"
extern Datum sqlf(PG_FUNCTION_ARGS);
PG_MODULE_MAGIC;
PG_FUNCTION_INFO_V1(sqlf);
Datum
sqlf(PG_FUNCTION_ARGS){
char *query = TextDatumGetCString(PG_GETARG_DATUM(0));
void *result;
yy_scan_string(query);
sqlf_yyparse(&result);
PG_RETURN_HEAPTUPLEHEADER(result);
}
regards.
