Apex Developer Guide

Getting Started
Writing Apex
Ways to Invoke Apex
Invoking Apex
Apex Transactions and Governor Limits
Using Salesforce Features with Apex
Actions
Approval Processing
Authentication
Chatter Answers and Ideas
Chatter in Apex
Moderate Chatter Private Messages with Triggers
Moderate Feed Items with Triggers
Communities
Email
Platform Cache
Salesforce Knowledge
Salesforce Connect
Salesforce Connect
Writable External Objects in Salesforce Connect
Get Started with the Apex Connector Framework
Key Concepts About the Apex Connector Framework
Considerations for the Apex Connector Framework
Apex Connector Framework Examples
Salesforce Reports and Dashboards API via Apex
Force.com Sites
Support Classes
Territory Management 2.0
Visual Workflow
Integration and Apex Utilities
Finishing Touches
Reference
Appendices
Glossary
PDF

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Considerations for the Apex Connector Framework

Understand the limits and considerations for creating Salesforce Connect custom adapters with the Apex Connector Framework.
  • Make sure that you understand the limits of the external system’s APIs. For example, some external systems accept only requests for up to 40 rows.
  • Data type limitations:
    • Double—The value loses precision beyond 18 significant digits. For higher precision, use decimals instead of doubles.
    • String—If the length is greater than 255 characters, the string is mapped to a long text area field in Salesforce.
  • Custom adapters for Salesforce Connect are subject to the same limitations as any other Apex code. For example:
    • All Apex governor limits apply.
    • Apex callouts aren’t allowed after data manipulation language (DML) operations in the same transaction. Therefore, within the same transaction, you can't update a Salesforce record and then do an Apex callout.
    • Test methods don’t support web service callouts; tests that perform web service callouts fail. For an example that shows how to avoid these failing tests by returning mock responses, see Google Drive™ Custom Adapter for Salesforce Connect.