How to test connection to Oracle Database using Java

Question

Is there a way to test my connection to oracle database using Java? Here\'s my code.

public class OracleConnection {

    public static void main(String[] args)          


        

Answer 1

For testing connection i will create and use 2 methods: for connection to db and for test this connection:

Class Connector {
private static final String CONNECTION_STRING = "jdbc:oracle:thin:@//%s:%d/%s";
private static final String QUERY_IS_CONNECTED = "SELECT * FROM table WHERE field = 'example'";
private static final Log LOG = LogFactory.getLog(Connector.class);

public Connection createConnection() {
    Connection connection = null;
    try {
        Class.forName("oracle.jdbc.driver.OracleDriver");
        connection = DriverManager.getConnection(String.format(CONNECTION_STRING, "127.0.0.1", "1521", "dbName"), "userName", "password");
    } catch (Exception e) {
        LOG.error("createConnection: connection error");
    }

 return connection;
}

public boolean isConnected() {

        try (Connection connection = createConnection()) {
            if (connection.isClosed()) {
                    return false;
            }

            try (Statement statement = connection.createStatement();
                 ResultSet resultSet = statement.executeQuery(QUERY_IS_CONNECTED)) {
                if (resultSet == null) {
                    return false;
                }
            } catch (Exception e) {
                LOG.error("isConnected: Query error", e);
                return false;
            }
        } catch (Exception e) {
            LOG.error("isConnected: Check connection error", e);
            return false;
        }

        return true;
    }
}

createConnection() - default connection to your db. Values of ip,port,dbName,userName and password will be yours.

isConnected() - first part check correct your connection and second part checks the correctness of working with the database. As there can be a connection, but not to be access for requests.