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Loader Postgres

PostgreSQL, often referred to as Postgres, is an object-relational database management system.

Postgres uses and extends the SQL language combined with many other features that safely store and scales the most complicated data workloads. 

The native data types that are supported include: 

Primitives: Integer, Numeric, String, Boolean

Structured: Date/Time, Array, Range, UUID 

Document: JSON/JSONB, XML, Key-value (Hstore) 

Geometry: Point, Line, Circle, Polygon 

Customizations: Composite, Custom Types

Learn more: about Postgres from PostgreSQL tutorials. 

The Postgres loader is used to load data into a table in the PostgreSQL database. 

Requirements

Credentials of the database you would like to connect to:

  • Host
  • Port
  • Name of the database, schema
  • Username
  • Password

If you wish to connect to a database outside of the Meiro  Integrations environment, you may need a front-end tool like PgAdmin4, Postico, DBeaver or any other front-end (GUI) tool available online. To learn more about these tools, please refer to their respective documentation online. Connecting via a GUI tool is not mandatory, but it may be useful if you want to access the database outside the Meiro  Integrations environment.

Postgres components work only with CSV tables. Other data formats need to be converted to CSV format by processors.

Features 

  • One file and multi-file tables,
  • Header and no header,
  • Custom delimiter, escape and quotation characters,
  • Automatic creation of the destination table (all data types as a text for columns) and manual override if the user wants to specify the data type for a column.

Data In/Data Out

Data In

Data from the previous component should be saved as a CSV table in the folder /data/in/tables/folder_name.

File structure:

ID,CAR,COST,DATE_OF_SALE

1,BWM,400000,2019-09-10

2,Volvo,3000,2019-01-10

Or without header

 1,BWM,400000,2019-09-10

2,Volvo,3000,2019-01-10

Warning:  json data should be escaped in the input file.

 

Data Out

N/A

Learn more: about the folder structure here.

Parameters

Table

Postgres-loadeer-table.png

DB Table Name (required)
Table’s name in the database.

Auto Create(true/ false)
If true, auto-creates columns by headers in CSV files, the type is text, nullable true and default is an empty string. Columns definitions will be ignored.

Delimiter (required)
Customer delimiter.

Quotation (required)
Custom quotation.

Escape(required)
Custom escape character.

Headers (required)
If true, headers are specified in the CSV files, if false columns will be populated in order in which they are entered.

Path to File/ Folder (required)
Path to the folder with data folders with specifications on the name of the table.

For example,
./data/in/tables/Saving_Product_MarFebJanDec

Load method (required)

full_load, insert, upsert

Full_load method
Method deletes given tables if exists. Re-creates them and inserts data from file(s).

Insert method
The method inserts data into the tables and ignores conflicts.

Upsert method
Method upsert data to the tables. In case of conflicts, data will be updated. 

Primary key (required)
List of primary keys (from columns specified further).

Column

Postgres-loader-column.png

Name (required)
Name of the column in the input table. If `HEADERS` is False, then the name can be anything 

DB Column Name (optional)
Column’s name

Data Type (required)
Column’s data type. Available native data types:

data-type.png

Nullable (optional)
Can be nullable

Default (required)
Default value

DB

postgres-laoder-db.png

The following  credentials are mandatory:

  • Host: can be numerical (like 111.11.111.111) or alphabetical (database.client.solutions),
  • Port: usually 5432 by default.
  • Schema
  • Database
  • User
  • Password 

Remember: You should be able to get all the credentials from the database administrator. 

 

 

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