pub trait FromSql<'a>where
Self: Sized + 'a,{
// Required method
fn from_sql(value: &'a ColumnData<'static>) -> Result<Option<Self>>;
}Expand description
A conversion trait from a TDS type by-reference.
A FromSql implementation for a Rust type is needed for using it as a
return parameter from Row#get or Row#try_get methods. The following
Rust types are already implemented to match the given server types:
| Rust type | Server type |
|---|---|
u8 | tinyint |
i16 | smallint |
i32 | int |
i64 | bigint |
f32 | float(24) |
f64 | float(53) |
bool | bit |
String/&str | nvarchar/varchar/nchar/char/ntext/text |
Vec<u8>/&[u8] | binary/varbinary/image |
Uuid | uniqueidentifier |
Numeric | numeric/decimal |
Decimal (with feature flag rust_decimal) | numeric/decimal |
XmlData | xml |
NaiveDateTime (with feature flag chrono) | datetime/datetime2/smalldatetime |
NaiveDate (with feature flag chrono) | date |
NaiveTime (with feature flag chrono) | time |
DateTime (with feature flag chrono) | datetimeoffset |
See the time module for more information about the date and time structs.
Required Methods§
sourcefn from_sql(value: &'a ColumnData<'static>) -> Result<Option<Self>>
fn from_sql(value: &'a ColumnData<'static>) -> Result<Option<Self>>
Returns the value, None being a null value, copying the value.
Object Safety§
This trait is not object safe.