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Version: 2.3.3

PostgreSql

JDBC PostgreSql Sink Connector

Support Those Engines​

Spark
Flink
SeaTunnel Zeta

Key Features​

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​

DatasourceSupported VersionsDriverUrlMaven
PostgreSQLDifferent dependency version has different driver class.org.postgresql.Driverjdbc:postgresql://localhost:5432/testDownload
PostgreSQLIf you want to manipulate the GEOMETRY type in PostgreSQL.org.postgresql.Driverjdbc:postgresql://localhost:5432/testDownload

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 typeSeaTunnel 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 TYPESNOT SUPPORTED YET

Options​

NameTypeRequiredDefaultDescription
urlStringYes-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
driverStringYes-The jdbc class name used to connect to the remote data source,
if you use PostgreSQL the value is org.postgresql.Driver.
userStringNo-Connection instance user name
passwordStringNo-Connection instance password
queryStringNo-Use this sql write upstream input datas to database. e.g INSERT ...,query have the higher priority
databaseStringNo-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.
tableStringNo-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_keysArrayNo-This option is used to support operations such as insert, delete, and update when automatically generate sql.
support_upsert_by_query_primary_key_existBooleanNofalseChoose 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_secIntNo30The time in seconds to wait for the database operation used to validate the connection to complete.
max_retriesIntNo0The number of retries to submit failed (executeBatch)
batch_sizeIntNo1000For 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_onceBooleanNofalseWhether to enable exactly-once semantics, which will use Xa transactions. If on, you need to
set xa_data_source_class_name.
generate_sink_sqlBooleanNofalseGenerate sql statements based on the database table you want to write to.
xa_data_source_class_nameStringNo-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_attemptsIntNo3The number of retries for transaction commit failures
transaction_timeout_secIntNo-1The timeout after the transaction is opened, the default is -1 (never timeout). Note that setting the timeout may affect
exactly-once semantics
auto_commitBooleanNotrueAutomatic transaction commit is enabled by default
common-optionsno-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"]
}
}