public String connectionString() {
        return connectionString(URL_PATTERN);
    }
Returns a JDBC connection string for the current configuration.

@return a {@code String} where the variables in {@code urlPattern} are replaced with values
    from the configuration
inlong-sort/sort-flink/sort-flink-v1.13/sort-connectors/postgres-cdc/src/main/java/io/debezium/connector/postgresql/connection/PostgresConnection.java