pub struct Db<K: ?Sized, V: ?Sized, C> { /* private fields */ }
Expand description
Database handle
These handles are created using DbBuilder
builder, which can be passed
by (shared) reference to Env::open_db
or EnvRw::create_db
.
The type arguments K
, V
, and C
reflect the type used for keys and
values, and whether duplicate keys are allowed (C
being KeysUnique
or
KeysDuplicate
), respectively.
Operations on databases is done using the methods of the Txn
trait or
TxnRw
struct. The database handle must be passed to these methods by
(shared) reference.
Using a Db
handle in a different environment (or in an environment that
has been closed and re-opened) will cause a panic.
Performs copy-assignment from
source
.
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Formats the value using the given formatter.
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This method tests for self
and other
values to be equal, and is used
by ==
.
This method tests for !=
. The default implementation is almost always
sufficient, and should not be overridden without very good reason.
Immutably borrows from an owned value.
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Mutably borrows from an owned value.
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Returns the argument unchanged.
Calls U::from(self)
.
That is, this conversion is whatever the implementation of
From<T> for U
chooses to do.
The resulting type after obtaining ownership.
Creates owned data from borrowed data, usually by cloning.
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Uses borrowed data to replace owned data, usually by cloning.
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The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.