Hi, On Sun, Dec 10, 2017 at 11:36 PM, petern <peter.nichvolo...@gmail.com> wrote: > Igor/Cezary, > > It is remarkable how 'struct Parse' already contains the constraint name as > Cezary pointed out. > -> Token constraintName;/* Name of the constraint currently being parsed */ > But is not included in the 'struct FKey' linked list node that is reeled in > to produce columns in the PRAGMA report. > For the official release, presumably, test cases would have to be added in > addition to simply hooking it up as suggested.
Now I'm curious if there is a plan to include the foreign key name in that PRAGMA output. It looks like everything is in place for that. Mr. Hipp? > > In the meantime, parsing wouldn't be difficult even with primitive built-in > SQL string functions. Consider how the constraint name must occur within > the comma delimited part of the well formed CREATE TABLE statement. When > obtained from sqlite_master, the statement is guaranteed to be well > formed. Simply examine each comma delimited candidate part. If present, > the first word between keyword CONSTRAINT and keyword REFERENCES is the > constraint name. Yes, I may try to do that in the meantime. Thank you. > > Peter > > > > > > > > > > On Sun, Dec 10, 2017 at 7:29 PM, Igor Korot <ikoro...@gmail.com> wrote: > >> Hi, >> >> On Sun, Dec 10, 2017 at 8:30 PM, Cezary H. Noweta <c...@poczta.onet.pl> >> wrote: >> > Hello, >> > >> > On 2017-12-11 01:04, Igor Korot wrote: >> > >> >> On Sun, Dec 10, 2017 at 5:01 PM, Cezary H. Noweta <c...@poczta.onet.pl> >> >> wrote: >> > >> > >> >>> On 2017-12-10 07:21, Igor Korot wrote: >> > >> > >> >>>> The CREATE TABLE statement supports the following syntax: >> >>>> >> >>>> CREATE TABLE( <column_name_list>, CONSTRAINT <fk_name> FOREIGN >> >>>> KEY(<fk_field>) REFERENCES <ref_table>(ref_column_list>); >> > >> > >> >>>> [...] If not - does this mean that the only way to get the name is to >> >>>> parse the >> >>>> sql >> >>>> from sqlite_master? Or there is a better way? >> > >> > >> >>> The answer is ``not''. Constraint names are ignored and disappearing >> >>> without >> >>> a trace except for ``CHECK'' constraint (the name is used to build an >> >>> error >> >>> message). Unparsed ``sql'' column of ``sqlite_master'' is the sole >> place >> >>> which contains an indirect info about ``FOREIGN KEY'' constraint's >> name. >> > >> > >> >> Thank you for confirming. >> > >> > You are welcome. BTW, SQLite parses SQL every time it creates a table >> > (by a SQL command or after an opening of BTree file) -- I believe there >> > is no better way. You do not need to parse SQL on your own (it is hard, >> > if not impossible, to establish a link between a name and a particular >> > constraint). All you need is to append ``char *'' field to ``struct >> > FKey'' and to inject a function ``build.c:sqlite3CreateForeignKey()'': >> > ``pParse->constraintName'' will contain the constraint's name (note >> > that the name is not dequoted -- you will have to dequote it; look at >> > ``build.c:sqlite3AddCheckConstraint()'' to know how assigning of a >> > constraint's name is done). This will allow you to build your own map of >> > ``FOREIGN KEY'' names. For example, if you want to expand ``PRAGMA >> > foreign_key_list'', go to ``pragma.c:sqlite3Pragma():case >> > PragTyp_FOREIGN_KEY_LIST:'' and append new FKey's field. >> >> Thank you, but I need to keep the official SQLite code. >> >> >> > >> > >> > -- best regards >> > >> > Cezary H. Noweta >> > _______________________________________________ >> > 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 >> > _______________________________________________ > 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
