via bindparam() or via literal(), i.e. select([literal('foo')])
- removed "table" argument from column(). this does not add the column
to the table anyway so was misleading.
- Select _exportable_columns() only exports Selectable instances
- Select uses _exportable_columns() when searching for engines
instead of _raw_columns for similar reasons (non selectables have no engine)
- _BindParamClause no longer has a _make_proxy(). its not a ColumnElement.
- _Label detects underlying column element and will generate its own
column()._make_proxy() if the element is not a ColumnElement. this
allows a Label to be declared for nearly anything and it can export
itself as a column on a containing Selectable.
distinct bindparam()s with the same name in a single statement,
and the key will be shared. proper positional/named args translate
at compile time. for the old behavior of "aliasing" bind parameters
with conflicting names, specify "unique=True" - this option is
still used internally for all the auto-genererated (value-based)
bind parameters.
column elements, since we can make no assumptions about the text. to
create labels for literal columns, you can say "somecol AS somelabel",
or use literal_column("somecol").label("somelabel")
- quoting wont occur for literal columns when they are "proxied" into the
column collection for their selectable (is_literal flag is propigated)
the difference is, an operation produces a BinaryExpression from which further operations
can occur whereas comparison produces the more restrictive BooleanExpression
is constructed with individual calls to append_column(); this fixes an ORM
bug whereby nested select statements were not getting correlated with the
main select generated by the Query object.
the appropriate negation operator if one is available.
- calling a negation on an "IN" or "IS" clause will result in
"NOT IN", "IS NOT" (as opposed to NOT (x IN y)).
and "read", the latter two of which are interpreted only by
Oracle and Mysql [ticket:292]
- added "lockmode" argument to base Query select/get functions,
including "with_lockmode" function to get a Query copy that has
a default locking mode. Will translate "read"/"update"
arguments into a for_update argument on the select side.
[ticket:292]
itself automatically based on if a parent schemaitem has a non-None
setting for the flag, or if not, then whether the identifier name is all lower
case or not. when set to True, quoting is applied to identifiers with mixed or
uppercase identifiers. quoting is also applied automatically in all cases to
identifiers that are known to be reserved words or contain other non-standard
characters. various database dialects can override all of this behavior, but
currently they are all using the default behavior. tested with postgres, mysql,
sqlite. needs more testing with firebird, oracle, ms-sql. part of the ongoing
work with [ticket:155]
function in ANSICompiler
MySQLCompiler then skips most CAST calls since it only seems to support the standard syntax for Date
types; other types now a TODO for MySQL
then, polymorphic_union() function now CASTs null()s to the type corresponding to the columns in the UNION,
since postgres doesnt like mixing NULL with integer types
(long road for that .....)
Mike Bayer