37 |
/* prototype */ |
/* prototype */ |
38 |
char *attr2text(ESTDOC *doc, char *attr); |
char *attr2text(ESTDOC *doc, char *attr); |
39 |
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ESTDB *db; |
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ESTCOND *cond; |
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ESTDOC *doc; |
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const CBLIST *texts; |
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int ecode, *est_result, resnum, i, j; |
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int limit = 0; |
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int offset = 0; |
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/* define PostgreSQL v1 function */ |
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PG_FUNCTION_INFO_V1(pgest); |
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Datum pgest(PG_FUNCTION_ARGS) { |
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FuncCallContext *funcctx; |
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int call_cntr; |
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int max_calls; |
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TupleDesc tupdesc; |
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TupleTableSlot *slot; |
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AttInMetadata *attinmeta; |
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char *index_path; |
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char *query; |
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char *attr; |
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/* stuff done only on the first call of the function */ |
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if (SRF_IS_FIRSTCALL()) { |
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MemoryContext oldcontext; |
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/* create a function context for cross-call persistence */ |
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funcctx = SRF_FIRSTCALL_INIT(); |
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/* switch to memory context appropriate for multiple function calls */ |
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oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx); |
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/* take arguments from function */ |
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/* index path */ |
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if (PG_ARGISNULL(0)) { |
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elog(ERROR, "index path can't be null"); |
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SRF_RETURN_DONE(funcctx); |
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} |
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index_path = _textout(PG_GETARG_TEXT_P(0)); |
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/* query string */ |
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if (PG_ARGISNULL(0)) { |
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query = ""; |
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} else { |
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query = _textout(PG_GETARG_TEXT_P(1)); |
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} |
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/* atribute filter */ |
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if (PG_ARGISNULL(2)) { |
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attr = ""; |
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} else { |
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attr = _textout(PG_GETARG_TEXT_P(2)); |
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} |
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/* limit */ |
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if (PG_ARGISNULL(3)) { |
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limit = 0; |
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} else { |
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limit = PG_GETARG_INT32(3); |
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} |
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/* offset */ |
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if (PG_ARGISNULL(4)) { |
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offset = 0; |
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} else { |
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offset = PG_GETARG_INT32(4); |
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} |
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/* open the database */ |
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elog(DEBUG1, "pgest: est_db_open(%s)", index_path); |
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if(!(db = est_db_open(index_path, ESTDBREADER, &ecode))){ |
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elog(ERROR, "est_db_open: can't open %s [%d]: %s", index_path, ecode, est_err_msg(ecode)); |
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SRF_RETURN_DONE(funcctx); |
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} |
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elog(DEBUG1, "pgest: query[%s] attr[%s] limit %d offset %d", query, (PG_ARGISNULL(2) ? "NULL" : attr), limit, offset); |
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/* create a search condition object */ |
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if (!(cond = est_cond_new())) { |
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elog(INFO, "pgest: est_cond_new failed"); |
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SRF_RETURN_DONE(funcctx); |
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} |
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/* set the search phrase to the search condition object */ |
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if (! PG_ARGISNULL(1) && strlen(query) > 0) |
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est_cond_set_phrase(cond, query); |
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/* minimum valid attribute length is 10: @a STREQ a */ |
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if (! PG_ARGISNULL(2) && strlen(attr) >= 10) { |
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elog(DEBUG1,"est_cond_add_attr(%s)", attr); |
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est_cond_add_attr(cond, attr); |
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} |
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/* get the result of search */ |
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est_result = est_db_search(db, cond, &resnum, NULL); |
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/* total number of tuples to be returned */ |
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if (limit && limit < resnum) { |
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funcctx->max_calls = limit - offset; |
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} else { |
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funcctx->max_calls = resnum - offset; |
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} |
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/* check if results exists */ |
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if ( 0 == funcctx->max_calls ) |
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elog(INFO, "pgest: no results for: %s", query ); |
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elog(DEBUG1, "pgest: found %d hits for %s", resnum, query); |
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/* Build a tuple description for a __pgest tuple */ |
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tupdesc = RelationNameGetTupleDesc("__pgest"); |
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/* allocate a slot for a tuple with this tupdesc */ |
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slot = TupleDescGetSlot(tupdesc); |
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/* assign slot to function context */ |
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funcctx->slot = slot; |
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/* |
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* generate attribute metadata needed later to produce tuples from raw |
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* C strings |
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*/ |
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attinmeta = TupleDescGetAttInMetadata(tupdesc); |
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funcctx->attinmeta = attinmeta; |
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MemoryContextSwitchTo(oldcontext); |
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elog(DEBUG1, "SRF_IS_FIRSTCALL done"); |
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} |
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/* stuff done on every call of the function */ |
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funcctx = SRF_PERCALL_SETUP(); |
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call_cntr = funcctx->call_cntr; |
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max_calls = funcctx->max_calls; |
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slot = funcctx->slot; |
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attinmeta = funcctx->attinmeta; |
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if (limit && call_cntr > limit - 1) { |
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elog(DEBUG1, "call_cntr: %d limit: %d", call_cntr, limit); |
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SRF_RETURN_DONE(funcctx); |
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} |
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if (call_cntr < max_calls) { |
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char **values; |
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HeapTuple tuple; |
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Datum result; |
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elog(DEBUG1, "pgest: loop count %d", call_cntr); |
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if (! est_result) { |
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elog(ERROR, "pgest: no estraier results"); |
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SRF_RETURN_DONE(funcctx); |
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} |
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/* |
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* Prepare a values array for storage in our slot. |
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* This should be an array of C strings which will |
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* be processed later by the type input functions. |
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*/ |
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if (doc = est_db_get_doc(db, est_result[call_cntr + offset], 0)) { |
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elog(DEBUG1, "URI: %s\n Title: %s\n", |
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est_doc_attr(doc, "@uri"), |
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est_doc_attr(doc, "@title") |
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); |
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values = (char **) palloc(4 * sizeof(char *)); |
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// values[0] = (char *) palloc(strlen(_estval) * sizeof(char)); |
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values[0] = (char *) attr2text(doc,"@id"); |
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values[1] = (char *) attr2text(doc,"@uri"); |
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values[2] = (char *) attr2text(doc,"@title"); |
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values[3] = (char *) attr2text(doc,"@size"); |
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/* destloy the document object */ |
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elog(DEBUG2, "est_doc_delete"); |
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est_doc_delete(doc); |
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} else { |
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elog(INFO, "no result from estraier"); |
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values[0] = DatumGetCString( "" ); |
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values[1] = DatumGetCString( "" ); |
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values[2] = DatumGetCString( "" ); |
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values[3] = DatumGetCString( "" ); |
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} |
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elog(DEBUG2, "build tuple"); |
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/* build a tuple */ |
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tuple = BuildTupleFromCStrings(attinmeta, values); |
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elog(DEBUG2, "make tuple into datum"); |
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/* make the tuple into a datum */ |
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result = TupleGetDatum(slot, tuple); |
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elog(DEBUG2, "cleanup"); |
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/* clean up ? */ |
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/* |
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pfree(values[0]); |
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pfree(values[1]); |
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pfree(values[2]); |
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pfree(values[3]); |
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pfree(values); |
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*/ |
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elog(DEBUG2, "cleanup over"); |
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SRF_RETURN_NEXT(funcctx, result); |
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} else { |
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elog(DEBUG1, "loop over"); |
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if(!est_db_close(db, &ecode)){ |
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elog(INFO, "est_db_close error: %s", est_err_msg(ecode)); |
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} |
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/* do when there is no more left */ |
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SRF_RETURN_DONE(funcctx); |
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} |
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} |
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41 |
/* work in progress */ |
/* work in progress */ |
42 |
PG_FUNCTION_INFO_V1(pgest_attr); |
PG_FUNCTION_INFO_V1(pgest_attr); |
43 |
Datum pgest_attr(PG_FUNCTION_ARGS) |
Datum pgest_attr(PG_FUNCTION_ARGS) |
44 |
{ |
{ |
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ArrayType *attr_arr = PG_GETARG_ARRAYTYPE_P(5); |
ArrayType *attr_arr = PG_GETARG_ARRAYTYPE_P(5); |
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Oid element_type = ARR_ELEMTYPE(attr_arr); |
Oid attr_element_type = ARR_ELEMTYPE(attr_arr); |
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int ndims = ARR_NDIM(attr_arr); |
int attr_ndims = ARR_NDIM(attr_arr); |
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int *dim_counts = ARR_DIMS(attr_arr); |
int *attr_dim_counts = ARR_DIMS(attr_arr); |
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int *dim_lower_bounds = ARR_LBOUND(attr_arr); |
int *attr_dim_lower_bounds = ARR_LBOUND(attr_arr); |
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int ncols = 0; |
int ncols = 0; |
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int nrows = 0; |
int nrows = 0; |
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int indx[MAXDIM]; |
int indx[MAXDIM]; |
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int16 typlen; |
int16 attr_len; |
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bool typbyval; |
bool attr_byval; |
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char typalign; |
char attr_align; |
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ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo; |
ReturnSetInfo *rsinfo = (ReturnSetInfo *) fcinfo->resultinfo; |
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AttInMetadata *attinmeta; |
AttInMetadata *attinmeta; |
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TupleDesc tupdesc; |
TupleDesc tupdesc; |
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int rsinfo_ncols; |
int rsinfo_ncols; |
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int i, j; |
int i, j; |
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/* estvars */ |
/* estvars */ |
68 |
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ESTDB *db; |
69 |
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ESTCOND *cond; |
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ESTDOC *doc; |
71 |
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const CBLIST *texts; |
72 |
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int ecode, *est_result, resnum; |
73 |
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int limit = 0; |
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int offset = 0; |
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char *index_path; |
char *index_path; |
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char *query; |
char *query; |
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char *attr; |
char *attr; |
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/* only allow 1D input array */ |
/* only allow 1D input array */ |
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if (ndims == 1) |
if (attr_ndims == 1) |
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{ |
{ |
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ncols = dim_counts[0]; |
ncols = attr_dim_counts[0]; |
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} |
} |
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else |
else |
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ereport(ERROR, |
ereport(ERROR, |
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"allowed in this context"))); |
"allowed in this context"))); |
98 |
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/* get info about element type needed to construct the array */ |
/* get info about element type needed to construct the array */ |
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get_typlenbyvalalign(element_type, &typlen, &typbyval, &typalign); |
get_typlenbyvalalign(attr_element_type, &attr_len, &attr_byval, &attr_align); |
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/* get the requested return tuple description */ |
/* get the requested return tuple description */ |
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tupdesc = rsinfo->expectedDesc; |
tupdesc = rsinfo->expectedDesc; |
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bool isnull; |
bool isnull; |
234 |
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/* array value of this position */ |
/* array value of this position */ |
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indx[0] = j + dim_lower_bounds[0]; |
indx[0] = j + attr_dim_lower_bounds[0]; |
237 |
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238 |
dvalue = array_ref(attr_arr, ndims, indx, -1, typlen, typbyval, typalign, &isnull); |
dvalue = array_ref(attr_arr, attr_ndims, indx, -1, attr_len, attr_byval, attr_align, &isnull); |
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240 |
if (!isnull && doc) |
if (!isnull && doc) |
241 |
values[j] = DatumGetCString( |
values[j] = DatumGetCString( |