PostgreSql

JDBC PostgreSql Sink Connector

Support Those Engines

Spark
Flink
SeaTunnel Zeta

Key Features

• exactly-once
• cdc

Use Xa transactions to ensure exactly-once. So only support exactly-once for the database which is support Xa transactions. You can set is_exactly_once=true to enable it.

Description

Write data through jdbc. Support Batch mode and Streaming mode, support concurrent writing, support exactly-once semantics (using XA transaction guarantee).

Supported DataSource Info

Datasource	Supported Versions	Driver	Url	Maven
PostgreSQL	Different dependency version has different driver class.	org.postgresql.Driver	jdbc:postgresql://localhost:5432/test	Download
PostgreSQL	If you want to manipulate the GEOMETRY type in PostgreSQL.	org.postgresql.Driver	jdbc:postgresql://localhost:5432/test	Download

Database Dependency

Please download the support list corresponding to 'Maven' and copy it to the '$SEATNUNNEL_HOME/plugins/jdbc/lib/' working directory
For example PostgreSQL datasource: cp postgresql-xxx.jar $SEATNUNNEL_HOME/plugins/jdbc/lib/
If you want to manipulate the GEOMETRY type in PostgreSQL, add postgresql-xxx.jar and postgis-jdbc-xxx.jar to $SEATNUNNEL_HOME/plugins/jdbc/lib/

Data Type Mapping

PostgreSQL Data type	SeaTunnel Data type
BOOL	BOOLEAN
_BOOL	ARRAY<BOOLEAN>
BYTEA	BYTES
_BYTEA	ARRAY<TINYINT>
INT2 SMALLSERIAL INT4 SERIAL	INT
_INT2 _INT4	ARRAY<INT>
INT8 BIGSERIAL	BIGINT
_INT8	ARRAY<BIGINT>
FLOAT4	FLOAT
_FLOAT4	ARRAY<FLOAT>
FLOAT8	DOUBLE
_FLOAT8	ARRAY<DOUBLE>
NUMERIC(Get the designated column's specified column size>0)	DECIMAL(Get the designated column's specified column size,Gets the number of digits in the specified column to the right of the decimal point)
NUMERIC(Get the designated column's specified column size<0)	DECIMAL(38, 18)
BPCHAR CHARACTER VARCHAR TEXT GEOMETRY GEOGRAPHY JSON JSONB	STRING
_BPCHAR _CHARACTER _VARCHAR _TEXT	ARRAY<STRING>
TIMESTAMP	TIMESTAMP
TIME	TIME
DATE	DATE
OTHER DATA TYPES	NOT SUPPORTED YET

Options

Name	Type	Required	Default	Description
url	String	Yes	-	The URL of the JDBC connection. Refer to a case: jdbc:postgresql://localhost:5432/test if you would use json or jsonb type insert please add jdbc url stringtype=unspecified option
driver	String	Yes	-	The jdbc class name used to connect to the remote data source, if you use PostgreSQL the value is org.postgresql.Driver.
user	String	No	-	Connection instance user name
password	String	No	-	Connection instance password
query	String	No	-	Use this sql write upstream input datas to database. e.g INSERT ...,query have the higher priority
database	String	No	-	Use this database and table-name auto-generate sql and receive upstream input datas write to database. This option is mutually exclusive with query and has a higher priority.
table	String	No	-	Use database and this table-name auto-generate sql and receive upstream input datas write to database. This option is mutually exclusive with query and has a higher priority.
primary_keys	Array	No	-	This option is used to support operations such as insert, delete, and update when automatically generate sql.
support_upsert_by_query_primary_key_exist	Boolean	No	false	Choose to use INSERT sql, UPDATE sql to process update events(INSERT, UPDATE_AFTER) based on query primary key exists. This configuration is only used when database unsupport upsert syntax. Note: that this method has low performance
connection_check_timeout_sec	Int	No	30	The time in seconds to wait for the database operation used to validate the connection to complete.
max_retries	Int	No	0	The number of retries to submit failed (executeBatch)
batch_size	Int	No	1000	For batch writing, when the number of buffered records reaches the number of batch_size or the time reaches checkpoint.interval , the data will be flushed into the database
is_exactly_once	Boolean	No	false	Whether to enable exactly-once semantics, which will use Xa transactions. If on, you need to set xa_data_source_class_name.
generate_sink_sql	Boolean	No	false	Generate sql statements based on the database table you want to write to.
xa_data_source_class_name	String	No	-	The xa data source class name of the database Driver, for example, PostgreSQL is org.postgresql.xa.PGXADataSource, and please refer to appendix for other data sources
max_commit_attempts	Int	No	3	The number of retries for transaction commit failures
transaction_timeout_sec	Int	No	-1	The timeout after the transaction is opened, the default is -1 (never timeout). Note that setting the timeout may affect exactly-once semantics
auto_commit	Boolean	No	true	Automatic transaction commit is enabled by default
common-options		no	-	Sink plugin common parameters, please refer to Sink Common Options for details

Tips

If partition_column is not set, it will run in single concurrency, and if partition_column is set, it will be executed in parallel according to the concurrency of tasks.

Task Example

Simple:

This example defines a SeaTunnel synchronization task that automatically generates data through FakeSource and sends it to JDBC Sink. FakeSource generates a total of 16 rows of data (row.num=16), with each row having two fields, name (string type) and age (int type). The final target table is test_table will also be 16 rows of data in the table. Before run this job, you need create database test and table test_table in your PostgreSQL. And if you have not yet installed and deployed SeaTunnel, you need to follow the instructions in Install SeaTunnel to install and deploy SeaTunnel. And then follow the instructions in Quick Start With SeaTunnel Engine to run this job.

# Defining the runtime environment
env {
  # You can set flink configuration here
  execution.parallelism = 1
  job.mode = "BATCH"
}

source {
  FakeSource {
    parallelism = 1
    result_table_name = "fake"
    row.num = 16
    schema = {
      fields {
        name = "string"
        age = "int"
      }
    }
  }
  # If you would like to get more information about how to configure seatunnel and see full list of source plugins,
  # please go to https://seatunnel.apache.org/docs/category/source-v2
}

transform {
  # If you would like to get more information about how to configure seatunnel and see full list of transform plugins,
    # please go to https://seatunnel.apache.org/docs/category/transform-v2
}

sink {
    jdbc {
       # if you would use json or jsonb type insert please add jdbc url stringtype=unspecified option
        url = "jdbc:postgresql://localhost:5432/test"
        driver = "org.postgresql.Driver"
        user = root
        password = 123456
        query = "insert into test_table(name,age) values(?,?)"
     }
  # If you would like to get more information about how to configure seatunnel and see full list of sink plugins,
  # please go to https://seatunnel.apache.org/docs/category/sink-v2
}

Generate Sink SQL

This example not need to write complex sql statements, you can configure the database name table name to automatically generate add statements for you

sink {
    Jdbc {
        # if you would use json or jsonb type insert please add jdbc url stringtype=unspecified option
        url = "jdbc:postgresql://localhost:5432/test"
        driver = org.postgresql.Driver
        user = root
        password = 123456
        
        generate_sink_sql = true
        database = test
        table = "public.test_table"
    }
}

Exactly-once :

For accurate write scene we guarantee accurate once

sink {
    jdbc {
       # if you would use json or jsonb type insert please add jdbc url stringtype=unspecified option
        url = "jdbc:postgresql://localhost:5432/test"
        driver = "org.postgresql.Driver"
    
        max_retries = 0
        user = root
        password = 123456
        query = "insert into test_table(name,age) values(?,?)"
    
        is_exactly_once = "true"
    
        xa_data_source_class_name = "org.postgresql.xa.PGXADataSource"
    }
}

CDC(Change Data Capture) Event

CDC change data is also supported by us In this case, you need config database, table and primary_keys.

sink {
    jdbc {
        # if you would use json or jsonb type insert please add jdbc url stringtype=unspecified option
        url = "jdbc:postgresql://localhost:5432/test"
        driver = "org.postgresql.Driver"
        user = root
        password = 123456
        
        generate_sink_sql = true
        # You need to configure both database and table
        database = test
        table = sink_table
        primary_keys = ["id","name"]
    }
}