Enum mysql::Value
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pub enum Value { NULL, Bytes(Vec<u8>), Int(i64), UInt(u64), Float(f64), Date(u16, u8, u8, u8, u8, u8, u32), Time(bool, u32, u8, u8, u8, u32), }
Value
enumerates possible values in mysql cells. Also Value
used to fill
prepared statements.
Note that to receive something different than Value::NULL
or Value::Bytes
from mysql
you should use prepared statements.
If you want to get something more useful from Value
you should implement
FromValue
on it. To get T: FromValue
from
nullable value you should rely on FromValue
implemented on Option<T>
.
To convert something to Value
you should implement Into<Value>
for it.
use mysql::value::from_row; let mut conn = pool.get_conn().unwrap(); let result = conn.prep_exec("SELECT ? * ?", (20i32, 0.8_f32)).unwrap(); for row in result { let c = from_row::<f32>(row.unwrap()); assert_eq!(c, 16.0_f32); }
Variants
NULL
Bytes(Vec<u8>)
Int(i64)
UInt(u64)
Float(f64)
Date(u16, u8, u8, u8, u8, u8, u32)
year, month, day, hour, minutes, seconds, micro seconds
Time(bool, u32, u8, u8, u8, u32)
is negative, days, hours, minutes, seconds, micro seconds
Methods
impl Value
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Trait Implementations
impl Clone for Value
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fn clone(&self) -> Value
Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
1.0.0
Performs copy-assignment from source
. Read more
impl PartialEq for Value
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fn eq(&self, __arg_0: &Value) -> bool
This method tests for self
and other
values to be equal, and is used by ==
. Read more
fn ne(&self, __arg_0: &Value) -> bool
This method tests for !=
.
impl PartialOrd for Value
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fn partial_cmp(&self, __arg_0: &Value) -> Option<Ordering>
This method returns an ordering between self
and other
values if one exists. Read more
fn lt(&self, __arg_0: &Value) -> bool
This method tests less than (for self
and other
) and is used by the <
operator. Read more
fn le(&self, __arg_0: &Value) -> bool
This method tests less than or equal to (for self
and other
) and is used by the <=
operator. Read more
fn gt(&self, __arg_0: &Value) -> bool
This method tests greater than (for self
and other
) and is used by the >
operator. Read more
fn ge(&self, __arg_0: &Value) -> bool
This method tests greater than or equal to (for self
and other
) and is used by the >=
operator. Read more
impl Debug for Value
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impl<'a, T: ToValue> From<&'a T> for Value
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impl<T: Into<Value>> From<Option<T>> for Value
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impl From<i8> for Value
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impl From<u8> for Value
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impl From<i16> for Value
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impl From<u16> for Value
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impl From<i32> for Value
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impl From<u32> for Value
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impl From<isize> for Value
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impl From<i64> for Value
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impl From<u64> for Value
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impl From<usize> for Value
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impl From<f32> for Value
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impl From<f64> for Value
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impl From<bool> for Value
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impl<'a> From<&'a [u8]> for Value
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impl From<Vec<u8>> for Value
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impl<'a> From<&'a str> for Value
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impl From<String> for Value
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impl From<NaiveDateTime> for Value
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fn from(x: NaiveDateTime) -> Value
Performs the conversion.
impl From<NaiveDate> for Value
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impl From<NaiveTime> for Value
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impl From<Timespec> for Value
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impl From<Duration> for Value
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impl From<Duration> for Value
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impl From<[u8; 0]> for Value
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impl From<[u8; 1]> for Value
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impl From<[u8; 2]> for Value
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impl From<[u8; 3]> for Value
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impl From<[u8; 4]> for Value
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impl From<[u8; 5]> for Value
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impl From<[u8; 6]> for Value
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impl From<[u8; 7]> for Value
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impl From<[u8; 8]> for Value
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impl From<[u8; 9]> for Value
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impl From<[u8; 10]> for Value
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impl From<[u8; 11]> for Value
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impl From<[u8; 12]> for Value
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impl From<[u8; 13]> for Value
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impl From<[u8; 14]> for Value
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impl From<[u8; 15]> for Value
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impl From<[u8; 16]> for Value
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impl From<[u8; 17]> for Value
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impl From<[u8; 18]> for Value
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impl From<[u8; 19]> for Value
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impl From<[u8; 20]> for Value
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impl From<[u8; 21]> for Value
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impl From<[u8; 22]> for Value
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impl From<[u8; 23]> for Value
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impl From<[u8; 24]> for Value
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impl From<[u8; 25]> for Value
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impl From<[u8; 26]> for Value
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impl From<[u8; 27]> for Value
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impl From<[u8; 28]> for Value
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impl From<[u8; 29]> for Value
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impl From<[u8; 30]> for Value
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impl From<[u8; 31]> for Value
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impl From<[u8; 32]> for Value
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impl FromValue for Value
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type Intermediate = ValueIr
fn from_value(v: Value) -> Value
Will panic if could not convert v
to Self
.
fn from_value_opt(v: Value) -> MyResult<Value>
Will return Err(Error::FromValueError(v))
if could not convert v
to Self
.
fn get_intermediate(v: Value) -> MyResult<Self::Intermediate>
Will return Err(Error::FromValueError(v))
if v
is not convertible to Self
.
impl From<Json> for Value
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impl<T: Serialize> From<Serialized<T>> for Value
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fn from(x: Serialized<T>) -> Value
Performs the conversion.