# JDBCStoredProcedureMonitor

The JDBCStoredProcedureMonitor checks the result of a stored procedure in a remote database. The result of the stored procedure has to be a boolean value (representing true or false). The service associated with this monitor is marked as up if the stored procedure returns true and it is marked as down in all other cases. It is based on the JDBC technology to connect and communicate with the database. This monitor implements placeholder substitution in parameter values.

## Monitor Facts

 Class Name `org.opennms.netmgt.poller.monitors.JDBCStoredProcedureMonitor` Remote Enabled false

## Configuration and Use

Table 1. Monitor specific parameters for the JDBCStoredProcedureMonitor
Parameter Description Required Default value Placeholder substitution

`driver`

JDBC driver class to use

required

`org.postgresql.Driver`

No

`url`

JDBC Url to connect to.

required

`jdbc:postgresql://:OPENNMS_JDBC_HOSTNAME/opennms`

Yes

`user`

Database user

required

`postgres`

Yes

`password`

required

`empty string`

Yes

`retries`

How many retries should be performed before failing the test

optional

`0`

No

`stored-procedure`

Name of the database stored procedure to call

required

`-`

No

`schema`

Name of the database schema in which the stored procedure is

optional

`test`

No

 The OPENNMS_JDBC_HOSTNAME is replaced in the url parameter with the IP or resolved hostname of the interface the monitored service is assigned to.

This monitor implements the Common Configuration Parameters.

## Provide the Database Driver

The JDBCStoredProcedureMonitor is based on JDBC and requires a JDBC driver to communicate with any database. Due to the fact that Meridian itself uses a PostgreSQL database, the PostgreSQL JDBC driver is available out of the box. For all other database systems a compatible JDBC driver has to be provided to Meridian as a jar-file. To provide a JDBC driver place the driver-jar in the `opennms/lib` folder of your Meridian.

## Examples

The following example checks a stored procedure added to the PostgreSQL database used by Meridian. The stored procedure returns true as long as less than 250000 events are in the events table of Meridian.

Stored procedure which is used in the monitor
``````CREATE OR REPLACE FUNCTION eventlimit_sp() RETURNS boolean AS
$BODY$DECLARE
num_events integer;
BEGIN
SELECT COUNT(*) into num_events from events;
RETURN num_events > 250000;
END;$BODY$
LANGUAGE plpgsql VOLATILE NOT LEAKPROOF
COST 100;``````
``````<service name="OpenNMS-DB-SP-Event-Limit" interval="300000" user-defined="true" status="on">
<parameter key="driver" value="org.postgresql.Driver"/>
<parameter key="url" value="jdbc:postgresql://OPENNMS_JDBC_HOSTNAME:5432/opennms"/>
<parameter key="user" value="opennms"/>