如何使用 influxdb-java 绑定查询中的参数

Question

I am not able to bind parameters in this code:

import org.influxdb.InfluxDB;
import org.influxdb.InfluxDBFactory;
import org.influxdb.dto.BoundParameterQuery;
import org.influxdb.dto.Query;
import org.influxdb.dto.QueryResult;

public class BindTest {
    public static void main(String[] args) {
        InfluxDB influxDB = InfluxDBFactory.connect("http://127.0.0.1:8086");
        String s = "SELECT LAST(*) FROM batch_assembly_monitoring WHERE last_batch_start = $lbs";
        Query query = BoundParameterQuery.QueryBuilder.newQuery(s)
                .bind("lbs", 234567890)
                .create();
        System.out.println(query.getCommand());
        QueryResult result = influxDB.query(query);
    }
}

The output I get at stdout:

SELECT LAST(*) FROM batch_assembly_monitoring WHERE last_batch_start = $lbs

and also InfluxDB log contains this:

[httpd] 172.17.0.1 - - [24/Sep/2020:12:40:29 +0000] "POST /query?params=%7B%22lbs%22%3A234567890%7D&q=SELECT+LAST%28%2A%29+FROM+batch_assembly_monitoring+WHERE+last_batch_start+%3D+%24lbs HTTP/1.1" 200 89 "-" "okhttp/4.8.1" 20fe610d-fe63-11ea-81ba-0242ac110002 271

It seems binding parameters are not bound and a placeholder string is used in query instead of value 234567890.

What do I wrong?

Answer 1

The problem was that I didn't set the database after connect:

influxDB.setDatabase("my_database");

After that it started working. InfluxDB log still does not contain bound parameter, only "lbs" string, but the parameter has been passed.