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Second, the discussions in what follows concentrate on SQL for obvious reasons, but my criticisms don t apply just to SQL per se Rather, they apply to any model in which tables have a left-to-right column ordering, as they do in the SQL model specifically Third, from this point forward I ll abbreviate left-to-right column ordering to just column ordering, for simplicity Please don t be misled by this abbreviated term into thinking I m talking about the top-to-bottom ordering of values within some column, as might be obtained (eg) by carrying out some ORDER BY operation..

sb = sandbox_init(kSBXProfileNoWrite, SANDBOX_NAMED, errbuf);

One immediate problem that column ordering causes in SQL is what we might call the SELECT * problem. Let me say immediately that there are much worse problems than this one! but this one is easy to understand, and the discussion that follows lays the groundwork for more searching discussions to come. Consider the following SQL definition for the usual suppliers table (more precisely, the usual suppliers base table note that the keyword TABLE in CREATE TABLE does mean a base table specifically): CREATE TABLE S ( S# CHAR(5), SNAME CHAR(20), STATUS INTEGER, CITY CHAR(15), PRIMARY KEY ( S# ) ) ;

Or, we can specify our own sandbox profile to apply more fine-grained, customized restrictions:

1. Despite the fact that the SQL standard never mentions the relational model, nor even the term relation!

A human could carry out the same tests repeatedly and then verify whether the tests worked The problem with getting a human to do this is that humans make errors when doing the same thing over and over again Humans are not incapable of doing the same thing over and over again, but they get bored and the mind wanders Humans are much better at spotting problems if the menial work is replaced with automation Automating the testing of RealPlayer is difficult, because RealPlayer is not under your control It is programmed using a traditional programming language Traditional programming languages create black boxes that a user cannot get around In the old days of Windows 31, an application could access another application s window handles That ability made it possible to do interesting things, but the cost was that hackers could wreak havoc on an application.

For simplicity I ve given every column a built-in type, though user-defined types might be more appropriate in practice for at least some of the columns Now suppose the user defines a cursor CX as follows: DECLARE CX CURSOR FOR SELECT * FROM S ; Or equivalently: DECLARE CX CURSOR FOR TABLE S ; In case you re unfamiliar with SQL s TABLE T construct, I should explain that the expression TABLE T is semantically equivalent to the expression SELECT * FROM T where T must be a table name specifically, not some more general table expression Note: In practice, cursor definitions and other embedded SQL statements require an EXEC SQL prefix I ve omitted those prefixes in this chapter as irrelevant to my main purpose.

sb = sandbox_init("/usr/share/sandbox/myprofile.sb", SANDBOX_NAMED, errbuf);

Here now is a corresponding FETCH: FETCH CX INTO :S#, :SNAME, :STATUS, :CITY ; For simplicity I ve given each target variable the same name as the corresponding column So far, so good But suppose now that for some reason the exact reason isn t important here but probably has to do with performance2 we change the column ordering in the suppliers table, perhaps as follows: CREATE TABLE S ( S# CHAR(5), CITY CHAR(15), SNAME CHAR(20), STATUS INTEGER, PRIMARY KEY ( S# ) ) ; What happens Answer: Run-time error on the FETCH! the DBMS attempts to convert an SNAME value to type INTEGER, and that attempt presumably fails (Note, by the way, that not getting the run-time error would be even worse, in a sense Suppose the column ordering rearrangement merely involved interchanging the SNAME and CITY columns.

NOTE: Although providing sandbox_init with a file system path to a profile, it isn t a documented (and presumably therefore not a supported) use of sandbox_init() If you are a developer and are looking to sandbox your application and hit problems acquiring certain resources, such as shared libraries or the like, not all is lost A key point to realize while coding is that seatbelt s behavior does not affect already established resources That is, any file descriptors, process executions, or other resource acquisitions that are performed prior to your call to sandbox_init() will not be restricted by the sandbox Only resource requests after that call will be restricted Thus, your program upon initializing can establish all of the necessary resources that it requires Then at that point you can apply the appropriate restrictions and ensure that moving forward your program will have limited capabilities to acquire more resources.

Today, applications are not allowed to access another application s GUI elements willy-nilly..