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PostgreSQL

PostgreSQL is a free and open-source relational database management system (RDBMS) emphasizing extensibility and SQL compliance.

Connection Properties

In a YAML file, the config section contains the following properties:

Connectorname: PostgreSQL
host: Hostname or IP address of the server
port: Server running port
username: Username
password: Password
database: Database
drivername: postgresql+pg8000

Select Properties

In the select section, specify the table name list to load tables from the PostgreSQL server.

Metadata Properties

In the metadata section, define the mode of data refresh. There are two modes: INCREMENTAL and FULL_TABLE. It only supports Date/DateTime datatype columns.

INCREMENTAL 
metadata:
  TableName:
    replication_method: INCREMENTAL
    replication_key: Column name
    replication_value: column value that data starts from
 This mode fetches data from the date column mentioned in the replication key from the start date as mentioned in the replication value. Once it is scheduled, the replication value is updated automatically from the imported data.
FULL_TABLE 
metadata:
  TableName:
    replication_method: FULL_TABLE
    replication_key: Column name
    replication_value: column value that data starts from
    interval_type: days/hours/minutes/year/month
    interval_value: integer value to add in the interval type
This mode fetches data from the date column specified in the replication key starting from the date specified in the replication value. Once scheduled, the replication value is updated according to the interval_type and interval_value from the imported data. For example, if the interval_type is set to 'year' and the interval_value is set to '1', the first schedule will fetch records from January 1, 2000 to December 31, 2000. In the next schedule, it will fetch records from January 1, 2001 to December 31, 2001, and so on.

Example Configuration

FULL_TABLE

version: 1
encrypt_credentials: false
plugins:
  extractors:
    - name: tap_postgres
      connectorname: PostgreSQL
      config:
        host: <HOSTNAME>
        port: <PORT>
        username: <USERNAME>
        database: <DATABASENAME>
        password: <PASSWORD>
        drivername: postgresql+pg8000
      select:
        - TABLE1
        - TABLE2
      metadata:
        TABLE1:
          replication_method: FULL_TABLE
          replication_key: last_modified_on
          replication_value: 2023-07-19 00:00:00
          interval_type: days
          interval_value: 6
        TABLE2:
          replication_method: FULL_TABLE
          replication_key: last_modified_on
          replication_value: 2023-07-19 00:00:00
          interval_type: days
          interval_value: 6

Incremental

version: 1
encrypt_credentials: false
plugins:
  extractors:
    - name: tap_postgres
      connectorname: PostgreSQL
      config:
        host: <HOSTNAME>
        port: <PORT>
        username: <USERNAME>
        database: <DATABASENAME>
        password: <PASSWORD>
        drivername: postgresql+pg8000
      select:
        - TABLE1
        - TABLE2
      metadata:
        TABLE1:
          replication_method: INCREMENTAL
          replication_key: last_modified_on
          replication_value: 2023-07-19 00:00:00
        TABLE2:
          replication_method: INCREMENTAL
          replication_key: last_modified_on
          replication_value: 2023-07-19 00:00:00