Select a record from a table when you only have the tableId

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public Common findRecord(TableId _tableId, RecId _recId, Boolean _forUpdate = false)
{
    Common      common;
    DictTable   dictTable;
    ;
    dictTable = new DictTable(_tableId);
    common = dictTable.makeRecord();
 
    common.selectForUpdate(_forUpdate);
 
    select common
    where common.RecId == _recId;
 
    return common;
}