Trait FromSql 

pub trait FromSql<'a>
where
    Self: Sized + 'a,
{
    // Required method
    fn from_sql(value: &'a ColumnData<'static>) -> Result<Option<Self>>;
}

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

fn from_sql(value: &'a ColumnData<'static>) -> Result<Option<Self>>

Returns the value, None being a null value, copying the value.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl<'a> FromSql<'a> for &'a str

fn from_sql(value: &'a ColumnData<'static>) -> Result<Option<Self>>

impl<'a> FromSql<'a> for &'a [u8]

fn from_sql(value: &'a ColumnData<'static>) -> Result<Option<Self>>

impl<'a> FromSql<'a> for bool

fn from_sql(data: &'a ColumnData<'static>) -> Result<Option<Self>>

impl<'a> FromSql<'a> for f32

fn from_sql(data: &'a ColumnData<'static>) -> Result<Option<Self>>

impl<'a> FromSql<'a> for f64

fn from_sql(data: &'a ColumnData<'static>) -> Result<Option<Self>>

impl<'a> FromSql<'a> for i16

fn from_sql(data: &'a ColumnData<'static>) -> Result<Option<Self>>

impl<'a> FromSql<'a> for i32

fn from_sql(data: &'a ColumnData<'static>) -> Result<Option<Self>>

impl<'a> FromSql<'a> for i64

fn from_sql(data: &'a ColumnData<'static>) -> Result<Option<Self>>

impl<'a> FromSql<'a> for u8

fn from_sql(data: &'a ColumnData<'static>) -> Result<Option<Self>>

Implementors

impl<'a> FromSql<'a> for &'a XmlData

impl<'a> FromSql<'a> for BigDecimal

Available on crate feature bigdecimal only.

impl<'a> FromSql<'a> for Decimal

Available on crate feature rust_decimal only.

impl<'a> FromSql<'a> for Numeric

impl<'a> FromSql<'a> for Uuid

impl<'a> FromSql<'a> for DateTime<FixedOffset>

Available on crate feature chrono only.

impl<'a> FromSql<'a> for DateTime<Utc>

Available on crate feature chrono only.

impl<'a> FromSql<'a> for NaiveDate

Available on crate feature chrono only.

impl<'a> FromSql<'a> for NaiveDateTime

Available on crate feature chrono only.

impl<'a> FromSql<'a> for NaiveTime

Available on crate feature chrono only.

impl<'a> FromSql<'a> for Date

Available on crate feature time only.

impl<'a> FromSql<'a> for OffsetDateTime

Available on crate feature time only.

impl<'a> FromSql<'a> for PrimitiveDateTime

Available on crate feature time only.

impl<'a> FromSql<'a> for Time

Available on crate feature time only.