[−][src]Trait diesel::serialize::ToSql

pub trait ToSql<A, DB: Backend>: Debug {
    fn to_sql<W: Write>(&self, out: &mut Output<W, DB>) -> Result;
}

Serializes a single value to be sent to the database.

The output is sent as a bind parameter, and the data must be written in the expected format for the given backend.

When possible, implementations of this trait should prefer using an existing implementation, rather than writing to out directly. (For example, if you are implementing this for an enum, which is represented as an integer in the database, you should use i32::to_sql(x, out) instead of writing to out yourself.

Any types which implement this trait should also #[derive(AsExpression)].

Backend specific details

Examples

Most implementations of this trait will be defined in terms of an existing implementation.

#[repr(i32)]
#[derive(Debug, Clone, Copy)]
pub enum MyEnum {
    A = 1,
    B = 2,
}

impl<DB> ToSql<Integer, DB> for MyEnum
where
    DB: Backend,
    i32: ToSql<Integer, DB>,
{
    fn to_sql<W: Write>(&self, out: &mut Output<W, DB>) -> serialize::Result {
        (*self as i32).to_sql(out)
    }
}

Required methods

fn to_sql<W: Write>(&self, out: &mut Output<W, DB>) -> Result

See the trait documentation.

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Implementations on Foreign Types

impl<'a, A, T: ?Sized, DB> ToSql<A, DB> for &'a T where
    DB: Backend,
    T: ToSql<A, DB>, [src]

impl ToSql<Datetime, Mysql> for MYSQL_TIME[src]

impl ToSql<Timestamp, Mysql> for MYSQL_TIME[src]

impl ToSql<Time, Mysql> for MYSQL_TIME[src]

impl ToSql<Date, Mysql> for MYSQL_TIME[src]

impl ToSql<Datetime, Mysql> for NaiveDateTime[src]

impl ToSql<Timestamp, Mysql> for NaiveDateTime[src]

impl ToSql<Time, Mysql> for NaiveTime[src]

impl ToSql<Date, Mysql> for NaiveDate[src]

impl ToSql<TinyInt, Mysql> for i8[src]

impl ToSql<Unsigned<TinyInt>, Mysql> for u8[src]

impl ToSql<Unsigned<SmallInt>, Mysql> for u16[src]

impl ToSql<Unsigned<Integer>, Mysql> for u32[src]

impl ToSql<Unsigned<BigInt>, Mysql> for u64[src]

impl ToSql<Bool, Mysql> for bool[src]

impl<__DB> ToSql<Nullable<Timestamp>, __DB> for SystemTime where
    __DB: Backend,
    Self: ToSql<Timestamp, __DB>, [src]

impl<__DB> ToSql<Nullable<Date>, __DB> for NaiveDate where
    __DB: Backend,
    Self: ToSql<Date, __DB>, [src]

impl<__DB> ToSql<Nullable<Time>, __DB> for NaiveTime where
    __DB: Backend,
    Self: ToSql<Time, __DB>, [src]

impl<__DB> ToSql<Nullable<Timestamp>, __DB> for NaiveDateTime where
    __DB: Backend,
    Self: ToSql<Timestamp, __DB>, [src]

impl<__DB> ToSql<Nullable<Datetime>, __DB> for NaiveDateTime where
    __DB: Backend,
    Self: ToSql<Datetime, __DB>, [src]

impl<DB: Backend> ToSql<Float, DB> for f32[src]

impl<DB: Backend> ToSql<Double, DB> for f64[src]

impl<DB: Backend> ToSql<SmallInt, DB> for i16[src]

impl<DB: Backend> ToSql<Integer, DB> for i32[src]

impl<DB: Backend> ToSql<BigInt, DB> for i64[src]

impl<T, ST, DB> ToSql<Nullable<ST>, DB> for Option<T> where
    T: ToSql<ST, DB>,
    DB: Backend,
    ST: NotNull, [src]

impl<__DB> ToSql<Nullable<Bool>, __DB> for bool where
    __DB: Backend,
    Self: ToSql<Bool, __DB>, [src]

impl<__DB> ToSql<Nullable<TinyInt>, __DB> for i8 where
    __DB: Backend,
    Self: ToSql<TinyInt, __DB>, [src]

impl<__DB> ToSql<Nullable<SmallInt>, __DB> for i16 where
    __DB: Backend,
    Self: ToSql<SmallInt, __DB>, [src]

impl<__DB> ToSql<Nullable<Integer>, __DB> for i32 where
    __DB: Backend,
    Self: ToSql<Integer, __DB>, [src]

impl<__DB> ToSql<Nullable<BigInt>, __DB> for i64 where
    __DB: Backend,
    Self: ToSql<BigInt, __DB>, [src]

impl<__DB> ToSql<Nullable<Unsigned<TinyInt>>, __DB> for u8 where
    __DB: Backend,
    Self: ToSql<Unsigned<TinyInt>, __DB>, [src]

impl<__DB> ToSql<Nullable<Unsigned<SmallInt>>, __DB> for u16 where
    __DB: Backend,
    Self: ToSql<Unsigned<SmallInt>, __DB>, [src]

impl<__DB> ToSql<Nullable<Unsigned<Integer>>, __DB> for u32 where
    __DB: Backend,
    Self: ToSql<Unsigned<Integer>, __DB>, [src]

impl<__DB> ToSql<Nullable<Unsigned<BigInt>>, __DB> for u64 where
    __DB: Backend,
    Self: ToSql<Unsigned<BigInt>, __DB>, [src]

impl<__DB> ToSql<Nullable<Float>, __DB> for f32 where
    __DB: Backend,
    Self: ToSql<Float, __DB>, [src]

impl<__DB> ToSql<Nullable<Double>, __DB> for f64 where
    __DB: Backend,
    Self: ToSql<Double, __DB>, [src]

impl<__DB> ToSql<Nullable<Text>, __DB> for String where
    __DB: Backend,
    Self: ToSql<Text, __DB>, [src]

impl<__DB> ToSql<Nullable<Text>, __DB> for str where
    __DB: Backend,
    Self: ToSql<Text, __DB>, [src]

impl<__DB> ToSql<Nullable<Binary>, __DB> for Vec<u8> where
    __DB: Backend,
    Self: ToSql<Binary, __DB>, [src]

impl<__DB> ToSql<Nullable<Binary>, __DB> for [u8] where
    __DB: Backend,
    Self: ToSql<Binary, __DB>, [src]

impl<DB: Backend> ToSql<Text, DB> for str[src]

impl<DB> ToSql<Text, DB> for String where
    DB: Backend,
    str: ToSql<Text, DB>, [src]

impl<DB> ToSql<Binary, DB> for Vec<u8> where
    DB: Backend,
    [u8]: ToSql<Binary, DB>, [src]

impl<DB: Backend> ToSql<Binary, DB> for [u8][src]

impl<'a, T: ?Sized, ST, DB> ToSql<ST, DB> for Cow<'a, T> where
    T: 'a + ToOwned + ToSql<ST, DB>,
    DB: Backend,
    Self: Debug, [src]

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Implementors

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