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Load an RDF file into a SQLite database without journaling.
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| // see https://github.com/mro/librdf.sqlite/issues/10#issuecomment-151000843 | |
| // | |
| // Perpare (on debian wheezy): | |
| // $ git clone https://github.com/mro/librdf.sqlite.git | |
| // $ cd librdf.sqlite/demo | |
| // $ sudo apt-get install gcc librdf0-dev librdf-storage-sqlite raptor2-utils | |
| // $ rapper --output turtle --input rdfxml http://tatort.rdf.mro.name/episodes.rdf > loader.ttl | |
| // rapper: Parsing URI http://tatort.rdf.mro.name/episodes.rdf with parser rdfxml | |
| // rapper: Serializing with serializer turtle | |
| // rapper: Parsing returned 100430 triples | |
| // | |
| // Compile: | |
| // $ gcc -std=c99 -I /usr/include/raptor2 -I /usr/include/rasqal -l rdf -lsqlite3 loader.c | |
| // | |
| // Run: | |
| // $ echo "librdf.sqlite" ; time ./a.out "file://$(pwd)/loader.ttl" "http://purl.mro.name/rdf/sqlite/" | |
| // real 0m9.726s | |
| // user 0m4.564s | |
| // sys 0m4.744s | |
| // $ echo "stock" ; time ./a.out "file://$(pwd)/loader.ttl" "sqlite" | |
| // real 15m2.400s | |
| // user 14m19.086s | |
| // sys 0m42.351s | |
| // | |
| // based on https://gist.github.com/abargnesi/8402baf1a019a2179e70 | |
| #include <stdio.h> | |
| #include <string.h> | |
| #include <stdarg.h> | |
| #include <librdf.h> | |
| #include <raptor2.h> | |
| #include "../rdf_storage_sqlite_mro.h" | |
| #include "../rdf_storage_sqlite_mro.c" // unorthodox but ok for now | |
| /* function prototypes */ | |
| int main(int argc, char *argv[]); | |
| int main(int argc, char *argv[]) { | |
| librdf_uri* uri; | |
| librdf_world* world; | |
| librdf_storage* storage; | |
| librdf_parser* parser; | |
| librdf_stream *stream; | |
| librdf_model* model; | |
| char *extfind; | |
| char *parser_name = NULL; | |
| char *storage_name = NULL; | |
| if (argc != 3) { | |
| fprintf(stderr, "usage: %s <rdf content URI> <name>\n", argv[0]); | |
| return(1); | |
| } | |
| // open world | |
| world = librdf_new_world(); | |
| librdf_world_open(world); | |
| librdf_init_storage_sqlite_mro(world); // register storage factory | |
| // assign uri for content | |
| uri = librdf_new_uri(world, (const unsigned char*) argv[1]); | |
| // assign storage name | |
| storage_name = argv[2]; | |
| if (!storage_name) { | |
| fprintf(stderr, "storage name was not set\n"); | |
| return 1; | |
| } | |
| extfind = strstr(argv[1], ".ttl"); | |
| if (extfind != NULL) { | |
| parser_name = "turtle"; | |
| } else { | |
| extfind = strstr(argv[1], ".nt"); | |
| if (extfind != NULL) { | |
| parser_name = "ntriples"; | |
| } | |
| } | |
| if (!parser_name) { | |
| fprintf(stderr, "uri was not turtle or ntriples\n"); | |
| return 1; | |
| } | |
| fprintf(stdout, "%s\n", extfind); | |
| // create storage | |
| storage = librdf_new_storage(world, storage_name, "loader.sqlite", "new='yes',synchronous='off'"); | |
| if (!storage) { | |
| fprintf(stderr, "could not create sqlite storage"); | |
| return(1); | |
| } | |
| // create model | |
| model = librdf_new_model(world, storage, NULL); | |
| // create parser | |
| parser = librdf_new_parser(world, parser_name, NULL, NULL); | |
| stream = librdf_parser_parse_as_stream(parser, uri, NULL); | |
| // librdf_model_transaction_start(model); | |
| librdf_model_add_statements(model, stream); | |
| //librdf_parser_parse_into_model(parser, uri, NULL, model); | |
| // librdf_model_transaction_commit(model); | |
| // free up | |
| librdf_free_parser(parser); | |
| librdf_free_model(model); | |
| librdf_free_uri(uri); | |
| librdf_free_world(world); | |
| return 0; | |
| } |
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Thanks for the correction and how to quickly load
http://purl.mro.name/rdf/sqlite/.In my previous setup, I could not figure out how to compile/load your storage independently so I replaced the sqlite extension, renamed some init factory methods, and compiled librdf. My loader used the storage "sqlite" but it loaded your storage mechanism. Hacky, :(.
Now I followed your instructions above and compiled it into the loader executable. I can confirm the same results relative to the size of the triple_relations table.
Here you will see a table scan for the original
triplesquery. When the s_uri_idNULLcheck is removed a table scan is not needed. In this case the query execution time goes from25 msto3 ms.