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retrieval of a triple

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This commit is contained in:
krasimir
2015-08-21 16:31:43 +00:00
parent b66276fda5
commit f9250c610c
1 changed files with 79 additions and 1 deletions
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80
src/runtime/c/sg/semantic_graph.c
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@@ -537,6 +537,80 @@ rollback:
return rc;
}
int
sg_select_triple(sqlite3 *db, i64 key, i64 *pSubj, i64 *pPred, i64 *pObj)
{
Table *triplesTbl =
sqlite3HashFind(&db->aDb[0].pSchema->tblHash, SG_TRIPLES);
if (!triplesTbl) return SQLITE_ERROR;
int rc;
rc = sqlite3BtreeBeginTrans(db->aDb[0].pBt, 0);
if (rc != SQLITE_OK) {
return rc;
}
BtCursor crsTriples;
memset(&crsTriples, 0, sizeof(crsTriples));
rc = sqlite3BtreeCursor(db->aDb[0].pBt, triplesTbl->tnum, 1, NULL, &crsTriples);
if (rc != SQLITE_OK) {
goto rollback;
}
int res;
rc = sqlite3BtreeMovetoUnpacked(&crsTriples, 0, key, 0, &res);
if (rc != SQLITE_OK)
goto close;
if (res == 0) {
int payloadSize;
rc = sqlite3BtreeDataSize(&crsTriples, &payloadSize);
if (rc != SQLITE_OK)
goto close;
u32 avail = 0;
const unsigned char* row = sqlite3BtreeDataFetch(&crsTriples, &avail);
row++;
int serial_type_subj, serial_type_pred, serial_type_obj;
row += getVarint32(row, serial_type_subj);
row += getVarint32(row, serial_type_pred);
row += getVarint32(row, serial_type_obj);
row++;
Mem mem[3];
row += sqlite3VdbeSerialGet(row, serial_type_subj, &mem[0]);
row += sqlite3VdbeSerialGet(row, serial_type_pred, &mem[1]);
row += sqlite3VdbeSerialGet(row, serial_type_obj, &mem[2]);
*pSubj = mem[0].u.i;
*pPred = mem[1].u.i;
*pObj = mem[2].u.i;
}
rc = sqlite3BtreeCloseCursor(&crsTriples);
if (rc != SQLITE_OK) {
goto rollback;
}
rc = sqlite3BtreeCommit(db->aDb[0].pBt);
if (rc != SQLITE_OK) {
return rc;
}
if (res != 0)
rc = SQLITE_DONE;
return rc;
close:
sqlite3BtreeCloseCursor(&crsTriples);
rollback:
sqlite3BtreeRollback(db->aDb[0].pBt, SQLITE_ABORT_ROLLBACK, 0);
return rc;
}
void main()
{
sqlite3 *db = NULL;
@@ -560,9 +634,13 @@ void main()
pgf_print_expr(e, NULL, 0, out, err);
printf("\n");
sg_insert_triple(db, 2, 2, 2, &key);
sg_insert_triple(db, 1, 2, 3, &key);
printf("%d\n", (int) key);
i64 subj, pred, obj;
sg_select_triple(db, key, &subj, &pred, &obj);
printf("%d %d %d\n", (int) subj, (int) pred, (int) obj);
gu_pool_free(tmp_pool);
sqlite3_close(db);