1.4.7. Other Topics

1.4.7.1. Microsoft SQL Server LIMIT and OFFSET

If the Atlas.Pdo Connection is to a Microsoft SQL Server ('sqlsrv') instance, the LIMIT-related methods on the query object will generate sqlsrv-specific variations of LIMIT ... OFFSET:

  • If only a LIMIT is present, it will be translated as a TOP clause.

  • If both LIMIT and OFFSET are present, it will be translated as an OFFSET ... ROWS FETCH NEXT ... ROWS ONLY clause. In this case there must be an ORDER BY clause, as the offset clause is a sub-clause of ORDER BY.

1.4.7.2. Identifier Quoting

Table and column identifiers will not be quoted automatically. If you need quotes around unusual or reserved identifiers, you will need to add them yourself.

1.4.7.3. Table Prefixes

One frequently-requested feature for this package is support for "automatic table prefixes" on all queries. This feature sounds great in theory, but in practice it is (1) difficult to implement well, and (2) even when implemented it turns out to be not as great as it seems in theory. This assessment is the result of the hard trials of experience. For those of you who want modifiable table prefixes, we suggest using constants with your table names prefixed as desired; as the prefixes change, you can then change your constants.