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PG_FINALLY

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This gives an alternative way of catching exceptions, for the common
case where the cleanup code is the same in the error and non-error
cases.  So instead of

    PG_TRY();
    {
        ... code that might throw ereport(ERROR) ...
    }
    PG_CATCH();
    {
        cleanup();
	PG_RE_THROW();
    }
    PG_END_TRY();
    cleanup();

one can write

    PG_TRY();
    {
        ... code that might throw ereport(ERROR) ...
    }
    PG_FINALLY();
    {
        cleanup();
    }
    PG_END_TRY();

Discussion: https://www.postgresql.org/message-id/flat/95a822c3-728b-af0e-d7e5-71890507ae0c%402ndquadrant.com
This commit is contained in:
Peter Eisentraut
2019-11-01 11:09:52 +01:00
parent 7302514088
commit 604bd36711
32 changed files with 91 additions and 245 deletions
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5
contrib/postgres_fdw/connection.c
View File

@@ -631,15 +631,12 @@ pgfdw_report_error(int elevel, PGresult *res, PGconn *conn,
message_context ? errcontext("%s", message_context) : 0,
sql ? errcontext("remote SQL command: %s", sql) : 0));
}
PG_CATCH();
PG_FINALLY();
{
if (clear)
PQclear(res);
PG_RE_THROW();
}
PG_END_TRY();
if (clear)
PQclear(res);
}
/*

25
contrib/postgres_fdw/postgres_fdw.c
View File

@@ -3155,15 +3155,11 @@ get_remote_estimate(const char *sql, PGconn *conn,
startup_cost, total_cost, rows, width);
if (n != 4)
elog(ERROR, "could not interpret EXPLAIN output: \"%s\"", line);
PQclear(res);
res = NULL;
}
PG_CATCH();
PG_FINALLY();
{
if (res)
PQclear(res);
PG_RE_THROW();
}
PG_END_TRY();
}
@@ -3383,15 +3379,11 @@ fetch_more_data(ForeignScanState *node)
/* Must be EOF if we didn't get as many tuples as we asked for. */
fsstate->eof_reached = (numrows < fsstate->fetch_size);
PQclear(res);
res = NULL;
}
PG_CATCH();
PG_FINALLY();
{
if (res)
PQclear(res);
PG_RE_THROW();
}
PG_END_TRY();
@@ -4404,15 +4396,11 @@ postgresAnalyzeForeignTable(Relation relation,
if (PQntuples(res) != 1 || PQnfields(res) != 1)
elog(ERROR, "unexpected result from deparseAnalyzeSizeSql query");
*totalpages = strtoul(PQgetvalue(res, 0, 0), NULL, 10);
PQclear(res);
res = NULL;
}
PG_CATCH();
PG_FINALLY();
{
if (res)
PQclear(res);
PG_RE_THROW();
}
PG_END_TRY();
@@ -4925,16 +4913,11 @@ postgresImportForeignSchema(ImportForeignSchemaStmt *stmt, Oid serverOid)
commands = lappend(commands, pstrdup(buf.data));
}
/* Clean up */
PQclear(res);
res = NULL;
}
PG_CATCH();
PG_FINALLY();
{
if (res)
PQclear(res);
PG_RE_THROW();
}
PG_END_TRY();