PostgreSQL

Overview

The PostgreSQL Load Node supports to write data into PostgreSQL database. This document describes how to set up the PostgreSQL Load Node to run SQL queries against PostgreSQL database.

Supported Version

Load Node	Driver	Group Id	Artifact Id	JAR
PostgreSQL	PostgreSQL	org.postgresql	postgresql	Download

Dependencies

In order to set up the PostgreSQL Load Node, the following provides dependency information for both projects using a build automation tool (such as Maven or SBT) and SQL Client with Sort Connectors JAR bundles.

Maven dependency

<dependency>
    <groupId>org.apache.inlong</groupId>
    <artifactId>sort-connector-jdbc</artifactId>
    <version>2.1.0-SNAPSHOT</version>
</dependency>

How to create a PostgreSQL Load Node

Usage for SQL API

-- MySQL extract node
CREATE TABLE `mysql_extract_table`(
  PRIMARY KEY (`id`) NOT ENFORCED,
  `id` BIGINT,
  `name` STRING,
  `age` INT
) WITH (
  'connector' = 'mysql-cdc-inlong',
  'url' = 'jdbc:mysql://localhost:3306/read',
  'username' = 'inlong',
  'password' = 'inlong',
  'table-name' = 'user'
)

-- PostgreSQL load node
CREATE TABLE `postgresql_load_table`(
  PRIMARY KEY (`id`) NOT ENFORCED,
  `id` BIGINT,
  `name` STRING,
  `age` INT
) WITH (
  'connector' = 'jdbc-inlong',
  'dialect-impl' = 'org.apache.inlong.sort.jdbc.dialect.PostgresDialect',
  'url' = 'jdbc:postgresql://localhost:5432/write',
  'username' = 'inlong',
  'password' = 'inlong',
  'table-name' = 'public.user'
)

-- write data into postgresql
INSERT INTO postgresql_load_table 
SELECT id, name , age FROM mysql_extract_table;  

Usage for InLong Dashboard

TODO: It will be supported in the future.

Usage for InLong Manager Client

TODO: It will be supported in the future.

PostgreSQL Load Node Options

Option	Required	Default	Type	Description
connector	required	(none)	String	Specify what connector to use, here should be 'jdbc-inlong'.
url	required	(none)	String	The JDBC database url.
table-name	required	(none)	String	The name of JDBC table to connect.
driver	optional	(none)	String	The class name of the JDBC driver to use to connect to this URL, if not set, it will automatically be derived from the URL.
username	optional	(none)	String	The JDBC user name. 'username' and 'password' must both be specified if any of them is specified.
password	optional	(none)	String	The JDBC password.
connection.max-retry-timeout	optional	60s	Duration	Maximum timeout between retries. The timeout should be in second granularity and shouldn't be smaller than 1 second.
sink.buffer-flush.max-rows	optional	100	Integer	The max size of buffered records before flush. Can be set to zero to disable it.
sink.buffer-flush.interval	optional	1s	Duration	The flush interval mills, over this time, asynchronous threads will flush data. Can be set to '0' to disable it. Note, 'sink.buffer-flush.max-rows' can be set to '0' with the flush interval set allowing for complete async processing of buffered actions.
sink.max-retries	optional	3	Integer	The max retry times if writing records to database failed.
sink.parallelism	optional	(none)	Integer	Defines the parallelism of the JDBC sink operator. By default, the parallelism is determined by the framework using the same parallelism of the upstream chained operator.
sink.ignore.changelog	optional	false	Boolean	Ignore all RowKind, ingest them as INSERT.
inlong.metric.labels	optional	(none)	String	Inlong metric label, format of value is groupId={groupId}&streamId={streamId}&nodeId={nodeId}.

Data Type Mapping

PostgreSQL type	Flink SQL type
	TINYINT
SMALLINT INT2 SMALLSERIAL SERIAL2	SMALLINT
INTEGER SERIAL	INT
BIGINT BIGSERIAL	BIGINT
	DECIMAL(20, 0)
REAL FLOAT4	FLOAT
FLOAT8 DOUBLE PRECISION	DOUBLE
NUMERIC(p, s) DECIMAL(p, s)	DECIMAL(p, s)
BOOLEAN	BOOLEAN
DATE	DATE
TIME [(p)][WITHOUT TIMEZONE]	TIME [(p)][WITHOUT TIMEZONE]
TIMESTAMP [(p)]WITHOUT TIMEZONE	TIMESTAMP [(p)][WITHOUT TIMEZONE]
CHAR(n) CHARACTER(n) VARCHAR(n) CHARACTER VARYING(n) TEXT	STRING
BYTEA	BYTES