Question:

How to check whether the user has access to a specified record from the database in Online CRM?

Answer:

Query the UserRecordAccess object in the database, specifying the RecordId and UserId. Check the permission information for the following fields:

• HasAllAccess 
• HasDeleteAccess 
• HasEditAccess
• HasReadAccess
• HasTransferAccess

The Salesforce Object Query Language (SOQL) appears as: 

SELECT HasAllAccess,HasDeleteAccess,HasEditAccess,HasReadAccess,HasTransferAccess,RecordId FROM UserRecordAccess WHERE RecordId = '<record id>' AND UserId = '<user id>'

Related Documentation:

N/A