internal_begin_transaction

# File activerecord/lib/active_record/connection_adapters/sqlite3/database_statements.rb, line 65
          def internal_begin_transaction(mode, isolation)
            if isolation
              raise TransactionIsolationError, "SQLite3 only supports the `read_uncommitted` transaction isolation level" if isolation != :read_uncommitted
              raise StandardError, "You need to enable the shared-cache mode in SQLite mode before attempting to change the transaction isolation level" unless shared_cache?
            end

            internal_execute("BEGIN #{mode} TRANSACTION", "TRANSACTION", allow_retry: true, materialize_transactions: false)
            if isolation
              @previous_read_uncommitted = query_value("PRAGMA read_uncommitted")
              internal_execute("PRAGMA read_uncommitted=ON", "TRANSACTION", allow_retry: true, materialize_transactions: false)
            end
          end