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Provide database object names as separate fields in error messages.

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This patch addresses the problem that applications currently have to
extract object names from possibly-localized textual error messages,
if they want to know for example which index caused a UNIQUE_VIOLATION
failure.  It adds new error message fields to the wire protocol, which
can carry the name of a table, table column, data type, or constraint
associated with the error.  (Since the protocol spec has always instructed
clients to ignore unrecognized field types, this should not create any
compatibility problem.)

Support for providing these new fields has been added to just a limited set
of error reports (mainly, those in the "integrity constraint violation"
SQLSTATE class), but we will doubtless add them to more calls in future.

Pavel Stehule, reviewed and extensively revised by Peter Geoghegan, with
additional hacking by Tom Lane.
This commit is contained in:
Tom Lane
2013-01-29 17:06:26 -05:00
parent 89d00cbe01
commit 991f3e5ab3
27 changed files with 604 additions and 41 deletions
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9
src/backend/commands/tablecmds.c
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@ -3828,7 +3828,8 @@ ATRewriteTable(AlteredTableInfo *tab, Oid OIDNewHeap, LOCKMODE lockmode)
ereport(ERROR,
(errcode(ERRCODE_NOT_NULL_VIOLATION),
errmsg("column \"%s\" contains null values",
NameStr(newTupDesc->attrs[attn]->attname))));
NameStr(newTupDesc->attrs[attn]->attname)),
errtablecol(oldrel, attn + 1)));
}
foreach(l, tab->constraints)
@ -3842,7 +3843,8 @@ ATRewriteTable(AlteredTableInfo *tab, Oid OIDNewHeap, LOCKMODE lockmode)
ereport(ERROR,
(errcode(ERRCODE_CHECK_VIOLATION),
errmsg("check constraint \"%s\" is violated by some row",
con->name)));
con->name),
errtableconstraint(oldrel, con->name)));
break;
case CONSTR_FOREIGN:
/* Nothing to do here */
@ -6659,7 +6661,8 @@ validateCheckConstraint(Relation rel, HeapTuple constrtup)
ereport(ERROR,
(errcode(ERRCODE_CHECK_VIOLATION),
errmsg("check constraint \"%s\" is violated by some row",
NameStr(constrForm->conname))));
NameStr(constrForm->conname)),
errtableconstraint(rel, NameStr(constrForm->conname))));
ResetExprContext(econtext);
}