[−][src]Trait mysql_async::prelude::FromRow
Trait to convert Row
into a tuple of FromValue
implementors up to arity 12.
This trait is convenient way to convert mysql row to a tuple or rust types and relies on
FromValue
trait, i.e. calling from_row::<(T, U)>(row)
is similar to calling
(T::from_value(column_1), U::from_value(column_2))
.
Note that conversion will always fail if any of columns was taken using Row::take
method.
Conversion of individual columns of a row may fail. In this case from_row
will panic, and
from_row_opt
will roll back conversion and return original row.
Concrete types of columns in a row is usually known to a programmer so from_value
should never
panic if types specified correctly. This means that column which holds NULL
should correspond
to a type wrapped in Option
, String
is used only with column which hold correct utf8, size
and signedness of a numeric type should match to a value stored in a column and so on.
// Consider columns in the row is: Bytes(<some binary data>), NULL and Int(1024) from_row::<(String, u8, u8>(row) // this will panic because of invalid utf8 in first column. from_row::<(Vec<u8>, u8, u8)>(row) // this will panic because of a NULL in second column. from_row::<(Vec<u8>, Option<u8>, u8)>(row) // this will panic because 1024 does not fit in u8. from_row::<(Vec<u8>)>(row) // this will panic because number of columns != arity of a tuple. from_row::<(Vec<u8>, Option<u8>, u16, Option<u8>)>(row) // same reason of panic as previous. from_row::<(Vec<u8>, Option<u8>, u16)>(row) // this'll work and return (vec![..], None, 1024u16)
Required methods
fn from_row_opt(row: Row) -> Result<Self, FromRowError>
Provided methods
Loading content...Implementations on Foreign Types
impl<T1, T2, T3> FromRow for (T1, T2, T3) where
T1: FromValue,
T2: FromValue,
T3: FromValue,
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T1: FromValue,
T2: FromValue,
T3: FromValue,
fn from_row_opt(row: Row) -> Result<(T1, T2, T3), FromRowError>
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impl<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12> FromRow for (T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12) where
T1: FromValue,
T10: FromValue,
T11: FromValue,
T12: FromValue,
T2: FromValue,
T3: FromValue,
T4: FromValue,
T5: FromValue,
T6: FromValue,
T7: FromValue,
T8: FromValue,
T9: FromValue,
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T1: FromValue,
T10: FromValue,
T11: FromValue,
T12: FromValue,
T2: FromValue,
T3: FromValue,
T4: FromValue,
T5: FromValue,
T6: FromValue,
T7: FromValue,
T8: FromValue,
T9: FromValue,
fn from_row_opt(
row: Row
) -> Result<(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12), FromRowError>
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row: Row
) -> Result<(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12), FromRowError>
impl<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11> FromRow for (T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11) where
T1: FromValue,
T10: FromValue,
T11: FromValue,
T2: FromValue,
T3: FromValue,
T4: FromValue,
T5: FromValue,
T6: FromValue,
T7: FromValue,
T8: FromValue,
T9: FromValue,
[src]
T1: FromValue,
T10: FromValue,
T11: FromValue,
T2: FromValue,
T3: FromValue,
T4: FromValue,
T5: FromValue,
T6: FromValue,
T7: FromValue,
T8: FromValue,
T9: FromValue,
fn from_row_opt(
row: Row
) -> Result<(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11), FromRowError>
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row: Row
) -> Result<(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11), FromRowError>
impl<T1, T2, T3, T4, T5> FromRow for (T1, T2, T3, T4, T5) where
T1: FromValue,
T2: FromValue,
T3: FromValue,
T4: FromValue,
T5: FromValue,
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T1: FromValue,
T2: FromValue,
T3: FromValue,
T4: FromValue,
T5: FromValue,
fn from_row_opt(row: Row) -> Result<(T1, T2, T3, T4, T5), FromRowError>
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impl<T1, T2, T3, T4> FromRow for (T1, T2, T3, T4) where
T1: FromValue,
T2: FromValue,
T3: FromValue,
T4: FromValue,
[src]
T1: FromValue,
T2: FromValue,
T3: FromValue,
T4: FromValue,
fn from_row_opt(row: Row) -> Result<(T1, T2, T3, T4), FromRowError>
[src]
impl<T1, T2> FromRow for (T1, T2) where
T1: FromValue,
T2: FromValue,
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T1: FromValue,
T2: FromValue,
fn from_row_opt(row: Row) -> Result<(T1, T2), FromRowError>
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impl<T1> FromRow for (T1,) where
T1: FromValue,
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T1: FromValue,
fn from_row_opt(row: Row) -> Result<(T1,), FromRowError>
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impl<T1, T2, T3, T4, T5, T6, T7, T8, T9, T10> FromRow for (T1, T2, T3, T4, T5, T6, T7, T8, T9, T10) where
T1: FromValue,
T10: FromValue,
T2: FromValue,
T3: FromValue,
T4: FromValue,
T5: FromValue,
T6: FromValue,
T7: FromValue,
T8: FromValue,
T9: FromValue,
[src]
T1: FromValue,
T10: FromValue,
T2: FromValue,
T3: FromValue,
T4: FromValue,
T5: FromValue,
T6: FromValue,
T7: FromValue,
T8: FromValue,
T9: FromValue,
fn from_row_opt(
row: Row
) -> Result<(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10), FromRowError>
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row: Row
) -> Result<(T1, T2, T3, T4, T5, T6, T7, T8, T9, T10), FromRowError>
impl<T1, T2, T3, T4, T5, T6, T7, T8> FromRow for (T1, T2, T3, T4, T5, T6, T7, T8) where
T1: FromValue,
T2: FromValue,
T3: FromValue,
T4: FromValue,
T5: FromValue,
T6: FromValue,
T7: FromValue,
T8: FromValue,
[src]
T1: FromValue,
T2: FromValue,
T3: FromValue,
T4: FromValue,
T5: FromValue,
T6: FromValue,
T7: FromValue,
T8: FromValue,
fn from_row_opt(
row: Row
) -> Result<(T1, T2, T3, T4, T5, T6, T7, T8), FromRowError>
[src]
row: Row
) -> Result<(T1, T2, T3, T4, T5, T6, T7, T8), FromRowError>
impl<T1, T2, T3, T4, T5, T6> FromRow for (T1, T2, T3, T4, T5, T6) where
T1: FromValue,
T2: FromValue,
T3: FromValue,
T4: FromValue,
T5: FromValue,
T6: FromValue,
[src]
T1: FromValue,
T2: FromValue,
T3: FromValue,
T4: FromValue,
T5: FromValue,
T6: FromValue,
fn from_row_opt(row: Row) -> Result<(T1, T2, T3, T4, T5, T6), FromRowError>
[src]
impl<T1, T2, T3, T4, T5, T6, T7, T8, T9> FromRow for (T1, T2, T3, T4, T5, T6, T7, T8, T9) where
T1: FromValue,
T2: FromValue,
T3: FromValue,
T4: FromValue,
T5: FromValue,
T6: FromValue,
T7: FromValue,
T8: FromValue,
T9: FromValue,
[src]
T1: FromValue,
T2: FromValue,
T3: FromValue,
T4: FromValue,
T5: FromValue,
T6: FromValue,
T7: FromValue,
T8: FromValue,
T9: FromValue,
fn from_row_opt(
row: Row
) -> Result<(T1, T2, T3, T4, T5, T6, T7, T8, T9), FromRowError>
[src]
row: Row
) -> Result<(T1, T2, T3, T4, T5, T6, T7, T8, T9), FromRowError>
impl<T1, T2, T3, T4, T5, T6, T7> FromRow for (T1, T2, T3, T4, T5, T6, T7) where
T1: FromValue,
T2: FromValue,
T3: FromValue,
T4: FromValue,
T5: FromValue,
T6: FromValue,
T7: FromValue,
[src]
T1: FromValue,
T2: FromValue,
T3: FromValue,
T4: FromValue,
T5: FromValue,
T6: FromValue,
T7: FromValue,
fn from_row_opt(row: Row) -> Result<(T1, T2, T3, T4, T5, T6, T7), FromRowError>
[src]
Implementors
impl FromRow for Row
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fn from_row(row: Row) -> Row
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fn from_row_opt(row: Row) -> Result<Row, FromRowError> where
Row: Sized,
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Row: Sized,
impl<T> FromRow for T where
T: FromValue,
[src]
T: FromValue,