I think you might be right there, but for my practical purpose I need the result to be invalid. I just wonder if a Halt at row 2 and no further rows produced is good way to determine this.
RBS On Wed, Aug 1, 2018 at 3:39 PM, Hick Gunter <h...@scigames.at> wrote: > Judging from the following output, I would say it is data producing, but > returns no rows for no table or a table that has no indexes. Just because a > given select statement returns no matching rows does not make it invalid > > asql> create temp table test (i integer, t text); > asql> create index test_i on test(i); > asql> pragma index_list(test); > seq name uniq > ---- ------------- ---- > 0 test_i 0 > asql> explain pragma index_list(test); > addr opcode p1 p2 p3 p4 p5 comment > ---- ------------- ---- ---- ---- ------------- -- ------------- > 0 Integer 0 1 0 00 NULL > 1 String8 0 2 0 test_i 00 NULL > 2 Integer 0 3 0 00 NULL > 3 ResultRow 1 3 0 00 NULL > 4 Halt 0 0 0 00 NULL > > -----Ursprüngliche Nachricht----- > Von: sqlite-users [mailto:sqlite-users-boun...@mailinglists.sqlite.org] > Im Auftrag von David Raymond > Gesendet: Mittwoch, 01. August 2018 16:31 > An: SQLite mailing list <sqlite-users@mailinglists.sqlite.org> > Betreff: [EXTERNAL] Re: [sqlite] Is pragma index_list without supplied > table name valid SQL? > > Don't forget this point about pragmas: > > https://www.sqlite.org/pragma.html > "No error messages are generated if an unknown pragma is issued. Unknown > pragmas are simply ignored. This means if there is a typo in a pragma > statement the library does not inform the user of the fact." > > That way if there's a typo, or if you try a new pragma in an old version > then it won't complain, it just won't do anything. > > -----Original Message----- > From: sqlite-users [mailto:sqlite-users-boun...@mailinglists.sqlite.org] > On Behalf Of Bart Smissaert > Sent: Wednesday, August 01, 2018 10:13 AM > To: General Discussion of SQLite Database > Subject: [sqlite] Is pragma index_list without supplied table name valid > SQL? > > Using SQLite 3.22.0 > > In my app I have code to determine if a given SQL string is > data-producing, non-data producing or invalid. It uses these 3 SQLite > functions: > > sqlite3_prepare_v3 > sqlite3_stmt_readonly > sqlite3_column_count > > Have been using this code for a few years and sofar never failed, but now > come across: > pragma index_list > so, without a supplied table name. > This gives me data-producing and I think it should give me invalid. > > Firstly is this SQL indeed invalid? > > Secondly, if it is I need to add some code to pick this up and was > thinking about using explain for that. Explain pragma index_list gives me: > > addr opcode p1 p2 p3 p4 p5 comment > --------------------------------------------------- > 0 Init 0 1 0 00 Start at 1 > 1 Halt 0 0 0 00 > > And that to me looks it is indeed an invalid SQL as it gives a Halt > already in the second row and produces no further rows. > > Am I right here and would this be a good way to pick up invalid SQL? > > > RBS > _______________________________________________ > sqlite-users mailing list > sqlite-users@mailinglists.sqlite.org > http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users > _______________________________________________ > sqlite-users mailing list > sqlite-users@mailinglists.sqlite.org > http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users > > > ___________________________________________ > Gunter Hick | Software Engineer | Scientific Games International GmbH | > Klitschgasse 2-4, A-1130 Vienna | FN 157284 a, HG Wien, DVR: 0430013 | (O) > +43 1 80100 - 0 > > May be privileged. May be confidential. Please delete if not the addressee. > _______________________________________________ > sqlite-users mailing list > sqlite-users@mailinglists.sqlite.org > http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users > _______________________________________________ sqlite-users mailing list sqlite-users@mailinglists.sqlite.org http://mailinglists.sqlite.org/cgi-bin/mailman/listinfo/sqlite-users
