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Merge pull request #423 from zerebubuth/c_iterate_upper_bound

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C iterate upper bound
This commit is contained in:
Igor Canadi 2014-11-26 10:14:16 -05:00
parent a97314219e 26109d487a
commit a486352e07
2 changed files with 72 additions and 3 deletions
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15
db/c.cc
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@ -80,7 +80,10 @@ struct rocksdb_writebatch_t { WriteBatch rep; };
struct rocksdb_snapshot_t { const Snapshot* rep; };
struct rocksdb_flushoptions_t { FlushOptions rep; };
struct rocksdb_fifo_compaction_options_t { CompactionOptionsFIFO rep; };
struct rocksdb_readoptions_t { ReadOptions rep; };
struct rocksdb_readoptions_t {
ReadOptions rep;
Slice upper_bound; // stack variable to set pointer to in ReadOptions
};
struct rocksdb_writeoptions_t { WriteOptions rep; };
struct rocksdb_options_t { Options rep; };
struct rocksdb_block_based_table_options_t { BlockBasedTableOptions rep; };
@ -1891,8 +1894,14 @@ void rocksdb_readoptions_set_snapshot(
void rocksdb_readoptions_set_iterate_upper_bound(
rocksdb_readoptions_t* opt,
const char* key, size_t keylen) {
Slice prefix = Slice(key, keylen);
opt->rep.iterate_upper_bound = &prefix;
if (key == nullptr) {
opt->upper_bound = Slice();
opt->rep.iterate_upper_bound = nullptr;
} else {
opt->upper_bound = Slice(key, keylen);
opt->rep.iterate_upper_bound = &opt->upper_bound;
}
}
void rocksdb_readoptions_set_read_tier(

60
db/c_test.c
View file

@ -823,6 +823,66 @@ int main(int argc, char** argv) {
rocksdb_cuckoo_options_destroy(cuckoo_options);
}
StartPhase("iterate_upper_bound");
{
// Create new empty database
rocksdb_close(db);
rocksdb_destroy_db(options, dbname, &err);
CheckNoError(err);
rocksdb_options_set_prefix_extractor(options, NULL);
db = rocksdb_open(options, dbname, &err);
CheckNoError(err);
rocksdb_put(db, woptions, "a", 1, "0", 1, &err); CheckNoError(err);
rocksdb_put(db, woptions, "foo", 3, "bar", 3, &err); CheckNoError(err);
rocksdb_put(db, woptions, "foo1", 4, "bar1", 4, &err); CheckNoError(err);
rocksdb_put(db, woptions, "g1", 2, "0", 1, &err); CheckNoError(err);
// testing basic case with no iterate_upper_bound and no prefix_extractor
{
rocksdb_readoptions_set_iterate_upper_bound(roptions, NULL, 0);
rocksdb_iterator_t* iter = rocksdb_create_iterator(db, roptions);
rocksdb_iter_seek(iter, "foo", 3);
CheckCondition(rocksdb_iter_valid(iter));
CheckIter(iter, "foo", "bar");
rocksdb_iter_next(iter);
CheckCondition(rocksdb_iter_valid(iter));
CheckIter(iter, "foo1", "bar1");
rocksdb_iter_next(iter);
CheckCondition(rocksdb_iter_valid(iter));
CheckIter(iter, "g1", "0");
rocksdb_iter_destroy(iter);
}
// testing iterate_upper_bound and forward iterator
// to make sure it stops at bound
{
// iterate_upper_bound points beyond the last expected entry
rocksdb_readoptions_set_iterate_upper_bound(roptions, "foo2", 4);
rocksdb_iterator_t* iter = rocksdb_create_iterator(db, roptions);
rocksdb_iter_seek(iter, "foo", 3);
CheckCondition(rocksdb_iter_valid(iter));
CheckIter(iter, "foo", "bar");
rocksdb_iter_next(iter);
CheckCondition(rocksdb_iter_valid(iter));
CheckIter(iter, "foo1", "bar1");
rocksdb_iter_next(iter);
// should stop here...
CheckCondition(!rocksdb_iter_valid(iter));
rocksdb_iter_destroy(iter);
}
}
StartPhase("cleanup");
rocksdb_close(db);
rocksdb_options_destroy(options);