Re: Rules versus triggers
On 7/3/20 5:01 μ.μ., Justin wrote: Yes a rule can rewrite query or replace the query Read through Depesz post about rules and the weird side affects that can occurr https://www.depesz.com/2010/06/15/to-rule-or-not-to-rule-that-is-the-question/ IMHO Rules are cool. It allows for more elegant design (vs doing it otherwise) and it results in faster queries. In our system we have currently 61 rules and 331 triggers. On Sat, Mar 7, 2020 at 9:57 AM stan mailto:st...@panix.com>> wrote: On Sat, Mar 07, 2020 at 09:47:39AM -0500, Justin wrote: > Hi Stan > > Rules actual are able to rewrite the SQL query sent to postgresql. Most > everyone suggestion is avoid rules. > > Triggers are just like every other databases Triggers firing off code for > Insert/Update/Delete/Truncate event > https://www.postgresql.org/docs/current/sql-createtrigger.html > So, the RULE can actually rewrite the query, instead of replacing it, which is what I m doing in the function, correct? -- "They that would give up essential liberty for temporary safety deserve neither liberty nor safety." -- Benjamin Franklin -- Achilleas Mantzios IT DEV Lead IT DEPT Dynacom Tankers Mgmt
Re: Rules versus triggers
Yes a rule can rewrite query or replace the query Read through Depesz post about rules and the weird side affects that can occurr https://www.depesz.com/2010/06/15/to-rule-or-not-to-rule-that-is-the-question/ On Sat, Mar 7, 2020 at 9:57 AM stan wrote: > On Sat, Mar 07, 2020 at 09:47:39AM -0500, Justin wrote: > > Hi Stan > > > > Rules actual are able to rewrite the SQL query sent to postgresql. Most > > everyone suggestion is avoid rules. > > > > Triggers are just like every other databases Triggers firing off code for > > Insert/Update/Delete/Truncate event > > https://www.postgresql.org/docs/current/sql-createtrigger.html > > > > So, the RULE can actually rewrite the query, instead of replacing it, > which is what I m doing in the function, correct? > -- > "They that would give up essential liberty for temporary safety deserve > neither liberty nor safety." > -- Benjamin Franklin >
Re: Rules versus triggers
On Sat, Mar 07, 2020 at 09:47:39AM -0500, Justin wrote: > Hi Stan > > Rules actual are able to rewrite the SQL query sent to postgresql. Most > everyone suggestion is avoid rules. > > Triggers are just like every other databases Triggers firing off code for > Insert/Update/Delete/Truncate event > https://www.postgresql.org/docs/current/sql-createtrigger.html > So, the RULE can actually rewrite the query, instead of replacing it, which is what I m doing in the function, correct? -- "They that would give up essential liberty for temporary safety deserve neither liberty nor safety." -- Benjamin Franklin
Re: Rules versus triggers
Hi Stan Rules actual are able to rewrite the SQL query sent to postgresql. Most everyone suggestion is avoid rules. Triggers are just like every other databases Triggers firing off code for Insert/Update/Delete/Truncate event https://www.postgresql.org/docs/current/sql-createtrigger.html On Sat, Mar 7, 2020 at 6:56 AM stan wrote: > Could someone give me a brief description of the intended functionally, and > how the 2 features work of rules, versus triggers? It appears to me that > they are simply 2 different ways to set up triggers, but I am certain that > is just because of my lack of knowledge. > > Thank you. > > -- > "They that would give up essential liberty for temporary safety deserve > neither liberty nor safety." > -- Benjamin Franklin > > >
Re: Rules versus triggers
On 07/03/2020 11:56, stan wrote: Could someone give me a brief description of the intended functionally, and how the 2 features work of rules, versus triggers? It appears to me that they are simply 2 different ways to set up triggers, but I am certain that is just because of my lack of knowledge. The pages https://wiki.postgresql.org/wiki/Don%27t_Do_This#Don.27t_use_rules links to will give you some idea of the differences. Cheers, Steve
