Re: [HACKERS] look up tables while parsing queries
On 2/5/06, Neil Conway [EMAIL PROTECTED] wrote: If you're referring to the raw parser (parser/gram.y), you should not attempt to access any tables. For one thing, the raw parser might be invoked outside a transaction. The statement might also refer to a table created earlier in the same query string, which would mean the referenced table would not exist when the latter part of the query string is parsed. Instead, database access should be done in the analysis phase -- see transformStmt() in parser/analyze.c and friends. There are plenty of examples in the code of how to access tables, which should be a helpful guide. -Neil It is not in the raw parser. I meant inside the transformStmt(). What is friends? Could you possibly point out at least one place that illustrates how to access tables? Thanks. -- andrew ---(end of broadcast)--- TIP 6: explain analyze is your friend
Re: [HACKERS] look up tables while parsing queries
On Fri, 2006-02-03 at 10:46 +0100, andrew wrote: I am modifying the source code. I want to look up some information from some tables while parsing the queries. If you're referring to the raw parser (parser/gram.y), you should not attempt to access any tables. For one thing, the raw parser might be invoked outside a transaction. The statement might also refer to a table created earlier in the same query string, which would mean the referenced table would not exist when the latter part of the query string is parsed. Instead, database access should be done in the analysis phase -- see transformStmt() in parser/analyze.c and friends. There are plenty of examples in the code of how to access tables, which should be a helpful guide. -Neil ---(end of broadcast)--- TIP 9: In versions below 8.0, the planner will ignore your desire to choose an index scan if your joining column's datatypes do not match
[HACKERS] look up tables while parsing queries
Hi I am modifying the source code. I want to look up some information from some tables while parsing the queries. What functions I can use to look up tables? btw I am using version 7.3. Thanks. -- andrew ---(end of broadcast)--- TIP 4: Have you searched our list archives? http://archives.postgresql.org
