Using Persistent Blobs

If you check the Microsoft’s Base Application, you wil discover that a table called “Persistent Blob” is available (table Id = 4151).This table is not directly accessible by code (its access level is Internal) and it’s defined as follows:

table 4151 "Persistent Blob"
{
    Access = Internal;
    fields
    {
        field(1; "Primary Key"; BigInteger)
        {
            AutoIncrement = true;
            DataClassification = SystemMetadata;
        }
        field(2; Blob; BLOB)
        {
            DataClassification = CustomerContent;
        }
    }
    keys
    {
        key(Key1; "Primary Key")
        {
            Clustered = true;
        }
    }
    fieldgroups
    {
    }
}

This table is used to store Blob values between sessions and you can use it via the Persistent Blob codeunit, that exposes the following methods:

• Create
• Exists
• Delete
• CopyFromInStream
• CopyToOutStream

The following code...