KSQL

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Overview

Use the SQL statement to the news data visualization in topic, for SQL queries, and table names field need to use double quotes to mark, example SQL is as follows:

select * from "ke_test_topic" where "partition" in (0,1,2) limit 100

As shown in the following figure:

DataSets

Note

Access to topic message data, depending on the underlying interface record of the earliest and latest offset, the default display up to 5000 records.

Parse JSONObject Or JSONArrays

Kafka topic datasets like this:

[{"id":123,"name":"smartloli"},{"id":456,"name":"smartloli2"},{"id":789,"name":"smartloli3"}]

Then you can use sql query topic like this:

select JSONS("msg",'name') from "topic_name" where "partition" in (0) limit 10

When Kafka topic datasets like this:

{"id":123,"name":"smartloli001"}

Then you can use sql query topic like this:

select JSON("msg",'name') from "topic_name" where "partition" in (0) limit 10

Using and syntax in SQL

select JSON("msg",'name') from "topic_name" where "partition" in (0) and JSON("msg",'name') = 'smartloli001' limit 10

Filter Query [where ... and]

Kafka topic datasets like this:

kafka-eagle-01
kafka-eagle-02
kafka-eagle-02
kafka-eagle-03
kafka-eagle-03
...
kafka-eagle-03
kafka-eagle-04

Then you can use sql query topic like this:

select * from "topic_name" where "partition" in (0) and "msg" = 'kafka-eagle-03' limit 10

Using like syntax in SQL

select * from "topic_name" where "partition" in (0) and "msg" like 'kafka-eagle%' limit 10

select * from "topic_name" where "partition" in (0) and "msg" like '%kafka-eagle%' limit 10