database_doc: Data exchange

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### 7.3 Functions for data exchange with a Postgresql database

• pq_exec_params: |  | Issuing SQL commands.
• pq_update_types: |  | Updating type information.
    Large objects
• pq_lo_import: |  | Importing large objects into a database.
• pq_lo_export: |  | Exporting large objects from a database.
• pq_lo_unlink: |  | Deleting large objects from a database.
• pq_lo_view: |  | Viewing large objects.