Trait sqlx_core::value::Value

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pub trait Value {
    type Database: Database;

    // Required methods
    fn as_ref(&self) -> <Self::Database as HasValueRef<'_>>::ValueRef;
    fn type_info(&self) -> Cow<'_, <Self::Database as Database>::TypeInfo>;
    fn is_null(&self) -> bool;

    // Provided methods
    fn decode<'r, T>(&'r self) -> T
       where T: Decode<'r, Self::Database> + Type<Self::Database> { ... }
    fn decode_unchecked<'r, T>(&'r self) -> T
       where T: Decode<'r, Self::Database> { ... }
    fn try_decode<'r, T>(&'r self) -> Result<T, Error>
       where T: Decode<'r, Self::Database> + Type<Self::Database> { ... }
    fn try_decode_unchecked<'r, T>(&'r self) -> Result<T, Error>
       where T: Decode<'r, Self::Database> { ... }
}
Expand description

An owned value from the database.

Required Associated Types§

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type Database: Database

Required Methods§

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fn as_ref(&self) -> <Self::Database as HasValueRef<'_>>::ValueRef

Get this value as a reference.

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fn type_info(&self) -> Cow<'_, <Self::Database as Database>::TypeInfo>

Get the type information for this value.

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fn is_null(&self) -> bool

Returns true if the SQL value is NULL.

Provided Methods§

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fn decode<'r, T>(&'r self) -> Twhere T: Decode<'r, Self::Database> + Type<Self::Database>,

Decode this single value into the requested type.

Panics

Panics if the value cannot be decoded into the requested type. See try_decode for a non-panicking version.

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fn decode_unchecked<'r, T>(&'r self) -> Twhere T: Decode<'r, Self::Database>,

Decode this single value into the requested type.

Unlike decode, this method does not check that the type of this value is compatible with the Rust type and blindly tries to decode the value.

Panics

Panics if the value cannot be decoded into the requested type. See try_decode_unchecked for a non-panicking version.

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fn try_decode<'r, T>(&'r self) -> Result<T, Error>where T: Decode<'r, Self::Database> + Type<Self::Database>,

Decode this single value into the requested type.

Errors
  • Decode if the value could not be decoded into the requested type.
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fn try_decode_unchecked<'r, T>(&'r self) -> Result<T, Error>where T: Decode<'r, Self::Database>,

Decode this single value into the requested type.

Unlike try_decode, this method does not check that the type of this value is compatible with the Rust type and blindly tries to decode the value.

Errors
  • Decode if the value could not be decoded into the requested type.

Implementors§