Re: multi-database
От | Joe Conway |
---|---|
Тема | Re: multi-database |
Дата | |
Msg-id | 3D9488E4.2070008@joeconway.com обсуждение исходный текст |
Ответ на | Re: multi-database ("Shridhar Daithankar" <shridhar_daithankar@persistent.co.in>) |
Список | pgsql-general |
Shridhar Daithankar wrote: > On 27 Sep 2002 at 10:34, mourad_dhambri wrote: >>what I want is to delete data from another database db2 and to insert data from my database db1 to db2. >>I don't think that dblink can do so. Is there another way ? > > Why not? Just create a view for table(s) in db1 in db2. And do following on db2 > delete from table1;insert into table1 select * from remoteview; > dblink documentation has example as how to create such a remote view.. > The original version of dblink (which is distributed with 7.2.x) does not support anything other than SELECT statements due to the fact that it wraps your statement in a CURSOR. The version of dblink in 7.3 (in beta now) has a new function, dblink_exec, which is specifically intended for INSERT/UPDATE/DELETE. If you can, please give the beta a try. I have a patch that allows dblink in 7.2 to execute INSERT/UPDATE/DELETE statements. I'll send it to you off-list if you want (let me know), but it would be better if you can wait for 7.3 to be released and use it. Joe p.s. In case anyone is interested, here's a brief synopsis of the new 7.3 dblink functions from the README: connection ------------ dblink_connect(text) RETURNS text - opens a connection that will persist for duration of current backend or until it is disconnected dblink_disconnect() RETURNS text - disconnects a persistent connection cursor ------------ dblink_open(text,text) RETURNS text - opens a cursor using connection already opened with dblink_connect() that will persist for duration of current backend or until it is closed dblink_fetch(text, int) RETURNS setof record - fetches data from an already opened cursor dblink_close(text) RETURNS text - closes a cursor query ------------ dblink(text,text) RETURNS setof record - returns a set of results from remote SELECT query (Note: comment out in dblink.sql to use deprecated version) dblink(text) RETURNS setof record - returns a set of results from remote SELECT query, using connection already opened with dblink_connect() execute ------------ dblink_exec(text, text) RETURNS text - executes an INSERT/UPDATE/DELETE query remotely dblink_exec(text) RETURNS text - executes an INSERT/UPDATE/DELETE query remotely, using connection already opened with dblink_connect() misc ------------ dblink_current_query() RETURNS text - returns the current query string dblink_get_pkey(text) RETURNS setof text - returns the field names of a relation's primary key fields dblink_build_sql_insert(text,int2vector,int2,_text,_text) RETURNS text - builds an insert statement using a local tuple, replacing the selection key field values with alternate supplied values dblink_build_sql_delete(text,int2vector,int2,_text) RETURNS text - builds a delete statement using supplied values for selection key field values dblink_build_sql_update(text,int2vector,int2,_text,_text) RETURNS text - builds an update statement using a local tuple, replacing the selection key field values with alternate supplied values Not installed by default deprecated ------------ dblink(text,text) RETURNS setof int - *DEPRECATED* returns a resource id for results from remote query (Note: must uncomment in dblink.sql to use) dblink_tok(int,int) RETURNS text - *DEPRECATED* extracts and returns individual field results; used only in conjunction with the *DEPRECATED* form of dblink (Note: must uncomment in dblink.sql to use) dblink_last_oid(int) RETURNS oid - *DEPRECATED* returns the last inserted oid
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