[−][src]Enum dbcrossbarlib::IfExists
What to do if the destination already exists.
Variants
If the destination exists, return an error.
If the destination exists, try to append the new data.
If the destination exists, overwrite the existing data.
If the destination exists, either update or insert using the specified
columns as the key. The list of keys must be non-empty, but we currently
only enforce that when parsing in FromStr
.
Trait Implementations
impl Clone for IfExists
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impl Default for IfExists
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impl Eq for IfExists
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impl PartialEq<IfExists> for IfExists
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impl Display for IfExists
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impl Debug for IfExists
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impl FromStr for IfExists
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type Err = Error
The associated error which can be returned from parsing.
fn from_str(s: &str) -> Result<IfExists>
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impl StructuralPartialEq for IfExists
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impl StructuralEq for IfExists
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Auto Trait Implementations
impl Send for IfExists
impl Sync for IfExists
impl Unpin for IfExists
impl UnwindSafe for IfExists
impl RefUnwindSafe for IfExists
Blanket Implementations
impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T> From<T> for T
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impl<T> ToOwned for T where
T: Clone,
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T: Clone,
type Owned = T
The resulting type after obtaining ownership.
fn to_owned(&self) -> T
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fn clone_into(&self, target: &mut T)
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impl<T> ToString for T where
T: Display + ?Sized,
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T: Display + ?Sized,
impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> IntoSql for T
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fn into_sql<T>(self) -> Self::Expression where
Self: AsExpression<T>,
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Self: AsExpression<T>,
fn as_sql<'a, T>(&'a self) -> <&'a Self as AsExpression<T>>::Expression where
&'a Self: AsExpression<T>,
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&'a Self: AsExpression<T>,
impl<T> SendSyncUnwindSafe for T where
T: Send + Sync + UnwindSafe + ?Sized,
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T: Send + Sync + UnwindSafe + ?Sized,
impl<Q, K> Equivalent<K> for Q where
K: Borrow<Q> + ?Sized,
Q: Eq + ?Sized,
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K: Borrow<Q> + ?Sized,
Q: Eq + ?Sized,
fn equivalent(&self, key: &K) -> bool
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impl<'a, T> TryFrom<&'a str> for T where
T: FromStr,
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T: FromStr,
type Err = <T as FromStr>::Err
fn try_from(string: &'a str) -> Result<T, <T as TryFrom<&'a str>>::Err>
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impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
impl<T> Same<T> for T
type Output = T
Should always be Self
impl<V, T> VZip<V> for T where
V: MultiLane<T>,
V: MultiLane<T>,