Copy data from PostgreSQL by using Azure Data Factory

This article outlines how to use the Copy Activity in Azure Data Factory to copy data from a PostgreSQL database. It builds on the copy activity overview article that presents a general overview of copy activity.

Supported capabilities

You can copy data from PostgreSQL database to any supported sink data store. For a list of data stores that are supported as sources/sinks by the copy activity, see the Supported data stores table.

Specifically, this PostgreSQL connector supports PostgreSQL version 7.4 and above.

Prerequisites

If your PostgreSQL database is not publicly accessible, you need to set up a Self-hosted Integration Runtime. To learn about Self-hosted integration runtimes, see Self-hosted Integration Runtime article. The Integration Runtime provides a built-in PostgreSQL driver starting from version 3.7, therefore you don't need to manually install any driver.

For Self-hosted IR version lower than 3.7, you need to install the Ngpsql data provider for PostgreSQL with version between 2.0.12 and 3.1.9 on the Integration Runtime machine.

Getting started

You can use one of the following tools or SDKs to use the copy activity with a pipeline. Select a link for step-by-step instructions:

The following sections provide details about properties that are used to define Data Factory entities specific to PostgreSQL connector.

Linked service properties

The following properties are supported for PostgreSQL linked service:

Property Description Required
type The type property must be set to: PostgreSql Yes
connectionString An ODBC connection string to connect to Azure Database for PostgreSQL.
Mark this field as a SecureString to store it securely in Data Factory. You can also put password in Azure Key Vault and pull the password configuration out of the connection string. Refer to the following samples and Store credentials in Azure Key Vault article with more details.
Yes
connectVia The Integration Runtime to be used to connect to the data store. You can use Self-hosted Integration Runtime or Azure Integration Runtime (if your data store is publicly accessible). If not specified, it uses the default Azure Integration Runtime. No

A typical connection string is Server=<server>;Database=<database>;Port=<port>;UID=<username>;Password=<Password>. More properties you can set per your case:

Property Description Options Required
EncryptionMethod (EM) The method the driver uses to encrypt data sent between the driver and the database server. E.g. ValidateServerCertificate=<0/1/6>; 0 (No Encryption) (Default) / 1 (SSL) / 6 (RequestSSL) No
ValidateServerCertificate (VSC) Determines whether the driver validates the certificate that is sent by the database server when SSL encryption is enabled (Encryption Method=1). E.g. ValidateServerCertificate=<0/1>; 0 (Disabled) (Default) / 1 (Enabled) No

Example:

{
    "name": "PostgreSqlLinkedService",
    "properties": {
        "type": "PostgreSql",
        "typeProperties": {
            "connectionString": {
                "type": "SecureString",
                "value": "Server=<server>;Database=<database>;Port=<port>;UID=<username>;Password=<Password>"
            }
        },
        "connectVia": {
            "referenceName": "<name of Integration Runtime>",
            "type": "IntegrationRuntimeReference"
        }
    }
}

Example: store password in Azure Key Vault

{
    "name": "PostgreSqlLinkedService",
    "properties": {
        "type": "PostgreSql",
        "typeProperties": {
            "connectionString": {
                "type": "SecureString",
                "value": "Server=<server>;Database=<database>;Port=<port>;UID=<username>;"
            },
            "password": { 
                "type": "AzureKeyVaultSecret", 
                "store": { 
                    "referenceName": "<Azure Key Vault linked service name>", 
                    "type": "LinkedServiceReference" 
                }, 
                "secretName": "<secretName>" 
            }
        },
        "connectVia": {
            "referenceName": "<name of Integration Runtime>",
            "type": "IntegrationRuntimeReference"
        }
    }
}

If you were using PostgreSQL linked service with the following payload, it is still supported as-is, while you are suggested to use the new one going forward.

Previous payload:

{
    "name": "PostgreSqlLinkedService",
    "properties": {
        "type": "PostgreSql",
        "typeProperties": {
            "server": "<server>",
            "database": "<database>",
            "username": "<username>",
            "password": {
                "type": "SecureString",
                "value": "<password>"
            }
        },
        "connectVia": {
            "referenceName": "<name of Integration Runtime>",
            "type": "IntegrationRuntimeReference"
        }
    }
}

Dataset properties

For a full list of sections and properties available for defining datasets, see the datasets article. This section provides a list of properties supported by PostgreSQL dataset.

To copy data from PostgreSQL, set the type property of the dataset to RelationalTable. The following properties are supported:

Property Description Required
type The type property of the dataset must be set to: RelationalTable Yes
tableName Name of the table in the PostgreSQL database. No (if "query" in activity source is specified)

Example

{
    "name": "PostgreSQLDataset",
    "properties":
    {
        "type": "RelationalTable",
        "linkedServiceName": {
            "referenceName": "<PostgreSQL linked service name>",
            "type": "LinkedServiceReference"
        },
        "typeProperties": {}
    }
}

Copy activity properties

For a full list of sections and properties available for defining activities, see the Pipelines article. This section provides a list of properties supported by PostgreSQL source.

PostgreSQL as source

To copy data from PostgreSQL, set the source type in the copy activity to RelationalSource. The following properties are supported in the copy activity source section:

Property Description Required
type The type property of the copy activity source must be set to: RelationalSource Yes
query Use the custom SQL query to read data. For example: "query": "SELECT * FROM \"MySchema\".\"MyTable\"". No (if "tableName" in dataset is specified)

Note

Schema and table names are case-sensitive. Enclose them in "" (double quotes) in the query.

Example:

"activities":[
    {
        "name": "CopyFromPostgreSQL",
        "type": "Copy",
        "inputs": [
            {
                "referenceName": "<PostgreSQL input dataset name>",
                "type": "DatasetReference"
            }
        ],
        "outputs": [
            {
                "referenceName": "<output dataset name>",
                "type": "DatasetReference"
            }
        ],
        "typeProperties": {
            "source": {
                "type": "RelationalSource",
                "query": "SELECT * FROM \"MySchema\".\"MyTable\""
            },
            "sink": {
                "type": "<sink type>"
            }
        }
    }
]

Next steps

For a list of data stores supported as sources and sinks by the copy activity in Azure Data Factory, see supported data stores.