On Apr 20, 2016, at 3:22 AM, Dominique Devienne <ddevienne at gmail.com> wrote:
> On Wed, Apr 20, 2016 at 4:40 AM, Jay Kreibich <jay at kreibi.ch> wrote: >> >> On Apr 19, 2016, at 1:34 PM, Jarred Ford <jroddrof at hotmail.com> wrote: >> >>> Is it possible to create multiple in-memory databases and be able to >> access tables with a single query between them? >>> For example, select * from db1.dbo.table1 db1 join db2.dbo.table1 db2 on >> db1.x = db2.x. >> >> Sure. Like any other database, you?ll need to open the additional >> databases using the ATTACH DATABASE command. Just open an in-memory >> database first, then run: >> >> ATTACH DATABASE ?:memory:? AS db2 >> > > To attach several memory DBs, it's more like > > ATTACH DATABASE "mem1?mode=memory" as db1; > ATTACH DATABASE "mem2?mode=memory" as db2; > etc... ?DD There is no requirement to use the URI style file type, you can just re-opening the special value ?:memory:?. $ ./sqlite3 SQLite version 3.8.4.2 2014-03-26 18:51:19 Enter ".help" for usage hints. Connected to a transient in-memory database. Use ".open FILENAME" to reopen on a persistent database. sqlite> ATTACH DATABASE ":memory:" AS db2; sqlite> ATTACH DATABASE ":memory:" AS db3; sqlite> ATTACH DATABASE ":memory:" AS db4; sqlite> ATTACH DATABASE ":memory:" AS db5; sqlite> .databases seq name file --- --------------- ---------------------------------------------------------- 0 main 2 db2 3 db3 4 db4 5 db5 -- Jay A. Kreibich < J A Y @ K R E I B I.C H > "Intelligence is like underwear: it is important that you have it, but showing it to the wrong people has the tendency to make them feel uncomfortable." -- Angela Johnson
