@ -8,7 +8,7 @@
* Portions Copyright ( c ) 1994 , Regents of the University of California
*
* IDENTIFICATION
* $ PostgreSQL : pgsql / src / backend / catalog / dependency . c , v 1.74 2008 / 06 / 08 22 : 41 : 04 tgl Exp $
* $ PostgreSQL : pgsql / src / backend / catalog / dependency . c , v 1.75 2008 / 06 / 11 21 : 53 : 48 tgl Exp $
*
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
*/
@ -62,6 +62,7 @@
# include "storage/lmgr.h"
# include "utils/builtins.h"
# include "utils/fmgroids.h"
# include "utils/guc.h"
# include "utils/lsyscache.h"
# include "utils/syscache.h"
# include "utils/tqual.h"
@ -752,7 +753,7 @@ findDependentObjects(const ObjectAddress *object,
*
* targetObjects : list of objects that are scheduled to be deleted
* behavior : RESTRICT or CASCADE
* msglevel : elog level for non - debug notice messages
* msglevel : elog level for non - error report messages
* origObject : base object of deletion , or NULL if not available
* ( the latter case occurs in DROP OWNED )
*/
@ -763,8 +764,36 @@ reportDependentObjects(const ObjectAddresses *targetObjects,
const ObjectAddress * origObject )
{
bool ok = true ;
StringInfoData clientdetail ;
StringInfoData logdetail ;
int numReportedClient = 0 ;
int numNotReportedClient = 0 ;
int i ;
/*
* If no error is to be thrown , and the msglevel is too low to be shown
* to either client or server log , there ' s no need to do any of the work .
*
* Note : this code doesn ' t know all there is to be known about elog
* levels , but it works for NOTICE and DEBUG2 , which are the only values
* msglevel can currently have . We also assume we are running in a normal
* operating environment .
*/
if ( behavior = = DROP_CASCADE & &
msglevel < client_min_messages & &
( msglevel < log_min_messages | | log_min_messages = = LOG ) )
return ;
/*
* We limit the number of dependencies reported to the client to
* MAX_REPORTED_DEPS , since client software may not deal well with
* enormous error strings . The server log always gets a full report .
*/
# define MAX_REPORTED_DEPS 100
initStringInfo ( & clientdetail ) ;
initStringInfo ( & logdetail ) ;
/*
* We process the list back to front ( ie , in dependency order not deletion
* order ) , since this makes for a more understandable display .
@ -773,34 +802,82 @@ reportDependentObjects(const ObjectAddresses *targetObjects,
{
const ObjectAddress * obj = & targetObjects - > refs [ i ] ;
const ObjectAddressExtra * extra = & targetObjects - > extras [ i ] ;
char * objDesc ;
/* Ignore the original deletion target(s) */
if ( extra - > flags & DEPFLAG_ORIGINAL )
continue ;
objDesc = getObjectDescription ( obj ) ;
/*
* If , at any stage of the recursive search , we reached the object
* via an AUTO or INTERNAL dependency , then it ' s okay to delete it
* even in RESTRICT mode .
*/
if ( extra - > flags & ( DEPFLAG_AUTO | DEPFLAG_INTERNAL ) )
{
/*
* auto - cascades are reported at DEBUG2 , not msglevel . We
* don ' t try to combine them with the regular message because
* the results are too confusing when client_min_messages and
* log_min_messages are different .
*/
ereport ( DEBUG2 ,
( errmsg ( " drop auto-cascades to %s " ,
getObjectDescription ( obj ) ) ) ) ;
objDesc ) ) ) ;
}
else if ( behavior = = DROP_RESTRICT )
{
ereport ( msglevel ,
( errmsg ( " %s depends on %s " ,
getObjectDescription ( obj ) ,
getObjectDescription ( & extra - > dependee ) ) ) ) ;
char * otherDesc = getObjectDescription ( & extra - > dependee ) ;
if ( numReportedClient < MAX_REPORTED_DEPS )
{
/* separate entries with a newline */
if ( clientdetail . len ! = 0 )
appendStringInfoChar ( & clientdetail , ' \n ' ) ;
appendStringInfo ( & clientdetail , _ ( " %s depends on %s " ) ,
objDesc , otherDesc ) ;
numReportedClient + + ;
}
else
numNotReportedClient + + ;
/* separate entries with a newline */
if ( logdetail . len ! = 0 )
appendStringInfoChar ( & logdetail , ' \n ' ) ;
appendStringInfo ( & logdetail , _ ( " %s depends on %s " ) ,
objDesc , otherDesc ) ;
pfree ( otherDesc ) ;
ok = false ;
}
else
ereport ( msglevel ,
( errmsg ( " drop cascades to %s " ,
getObjectDescription ( obj ) ) ) ) ;
{
if ( numReportedClient < MAX_REPORTED_DEPS )
{
/* separate entries with a newline */
if ( clientdetail . len ! = 0 )
appendStringInfoChar ( & clientdetail , ' \n ' ) ;
appendStringInfo ( & clientdetail , _ ( " drop cascades to %s " ) ,
objDesc ) ;
numReportedClient + + ;
}
else
numNotReportedClient + + ;
/* separate entries with a newline */
if ( logdetail . len ! = 0 )
appendStringInfoChar ( & logdetail , ' \n ' ) ;
appendStringInfo ( & logdetail , _ ( " drop cascades to %s " ) ,
objDesc ) ;
}
pfree ( objDesc ) ;
}
if ( numNotReportedClient > 0 )
appendStringInfo ( & clientdetail , _ ( " \n and %d other objects "
" (see server log for list) " ) ,
numNotReportedClient ) ;
if ( ! ok )
{
if ( origObject )
@ -808,13 +885,35 @@ reportDependentObjects(const ObjectAddresses *targetObjects,
( errcode ( ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST ) ,
errmsg ( " cannot drop %s because other objects depend on it " ,
getObjectDescription ( origObject ) ) ,
errdetail ( " %s " , clientdetail . data ) ,
errdetail_log ( " %s " , logdetail . data ) ,
errhint ( " Use DROP ... CASCADE to drop the dependent objects too. " ) ) ) ;
else
ereport ( ERROR ,
( errcode ( ERRCODE_DEPENDENT_OBJECTS_STILL_EXIST ) ,
errmsg ( " cannot drop desired object(s) because other objects depend on them " ) ,
errdetail ( " %s " , clientdetail . data ) ,
errdetail_log ( " %s " , logdetail . data ) ,
errhint ( " Use DROP ... CASCADE to drop the dependent objects too. " ) ) ) ;
}
else if ( numReportedClient > 1 )
{
ereport ( msglevel ,
/* translator: %d always has a value larger than 1 */
( errmsg ( " drop cascades to %d other objects " ,
numReportedClient + numNotReportedClient ) ,
errdetail ( " %s " , clientdetail . data ) ,
errdetail_log ( " %s " , logdetail . data ) ) ) ;
}
else if ( numReportedClient = = 1 )
{
/* we just use the single item as-is */
ereport ( msglevel ,
( errmsg_internal ( " %s " , clientdetail . data ) ) ) ;
}
pfree ( clientdetail . data ) ;
pfree ( logdetail . data ) ;
}
/*
Tom Lane
18 years ago