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Make self-referencing foreign key on repl_nodes table deferrable

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This commit is contained in:
Ian Barwick
2016-04-01 15:19:22 +09:00
parent 5d32026b79
commit 5bc809466c
3 changed files with 52 additions and 1 deletions
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20
dbutils.c
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@@ -1127,6 +1127,21 @@ witness_copy_node_records(PGconn *masterconn, PGconn *witnessconn, char *cluster
begin_transaction(witnessconn);
/* Defer constraints */
sqlquery_snprintf(sqlquery, "SET CONSTRAINTS ALL DEFERRED;");
log_verbose(LOG_DEBUG, "witness_copy_node_records():\n%s\n", sqlquery);
res = PQexec(witnessconn, sqlquery);
if (!res || PQresultStatus(res) != PGRES_COMMAND_OK)
{
log_err(_("Unable to defer constraints:\n%s\n"),
PQerrorMessage(witnessconn));
rollback_transaction(witnessconn);
return false;
}
/* Truncate existing records */
sqlquery_snprintf(sqlquery, "TRUNCATE TABLE %s.repl_nodes", get_repmgr_schema_quoted(witnessconn));
log_verbose(LOG_DEBUG, "witness_copy_node_records():\n%s\n", sqlquery);
@@ -1136,9 +1151,12 @@ witness_copy_node_records(PGconn *masterconn, PGconn *witnessconn, char *cluster
{
log_err(_("Unable to truncate witness servers's repl_nodes table:\n%s\n"),
PQerrorMessage(witnessconn));
rollback_transaction(witnessconn);
return false;
}
/* Get current records from primary */
sqlquery_snprintf(sqlquery,
"SELECT id, type, upstream_node_id, name, conninfo, priority, slot_name, active FROM %s.repl_nodes",
get_repmgr_schema_quoted(masterconn));
@@ -1156,6 +1174,7 @@ witness_copy_node_records(PGconn *masterconn, PGconn *witnessconn, char *cluster
return false;
}
/* Insert primary records into witness table */
for (i = 0; i < PQntuples(res); i++)
{
bool node_record_created;
@@ -1197,6 +1216,7 @@ witness_copy_node_records(PGconn *masterconn, PGconn *witnessconn, char *cluster
}
PQclear(res);
/* And finished */
commit_transaction(witnessconn);
return true;