Struct ParameterDescriptor

pub struct ParameterDescriptor { /* private fields */ }

Metadata for a parameter.

Implementations

impl ParameterDescriptor

pub fn binding(&self) -> ParameterBinding

Describes whether a parameter can be NULL or not, or if it has a default value.

pub fn is_nullable(&self) -> bool

Returns true if the column can contain NULL values.

Is a shortcut for matching against the parameter binding.

pub fn has_default(&self) -> bool

Returns true if the column has a default value.

Is a shortcut for matching against the parameter binding.

pub fn is_auto_incremented(&self) -> bool

Returns true if the column is auto-incremented.

pub fn is_array_type(&self) -> bool

Returns true if the parameter is of array type

pub fn type_id(&self) -> TypeId

Returns the type id of the parameter.

pub fn scale(&self) -> i16

Scale.

pub fn precision(&self) -> i16

Precision.

pub fn direction(&self) -> ParameterDirection

Describes whether a parameter is used for input, output, or both.

pub fn name(&self) -> Option<&str>

Returns the name of the parameter.

pub fn parse_value<S>(&self, s: S) -> Result<HdbValue<'static>, HdbError>

where S: AsRef<str>,

Parse an HdbValue from a String.

Errors

HdbError::Deserialization if parsing fails.

Trait Implementations

impl Clone for ParameterDescriptor

fn clone(&self) -> ParameterDescriptor

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl DbvFactory for &ParameterDescriptor

type DBV = HdbValue<'static>

The type of the database objects.

fn serialize_bool( &self, value: bool, ) -> Result<HdbValue<'static>, SerializationError>

Serialize a bool.

fn serialize_i8( &self, value: i8, ) -> Result<HdbValue<'static>, SerializationError>

Serialize an i8.

fn serialize_i16( &self, value: i16, ) -> Result<HdbValue<'static>, SerializationError>

Serialize an i16.

fn serialize_i32( &self, value: i32, ) -> Result<HdbValue<'static>, SerializationError>

Serialize an i32.

fn serialize_i64( &self, value: i64, ) -> Result<HdbValue<'static>, SerializationError>

Serialize an i64.

fn serialize_u8( &self, value: u8, ) -> Result<HdbValue<'static>, SerializationError>

Serialize an u8.

fn serialize_u16( &self, value: u16, ) -> Result<HdbValue<'static>, SerializationError>

Serialize an u16.

fn serialize_u32( &self, value: u32, ) -> Result<HdbValue<'static>, SerializationError>

Serialize an u32.

fn serialize_u64( &self, value: u64, ) -> Result<HdbValue<'static>, SerializationError>

Serialize an u64.

fn serialize_f32( &self, value: f32, ) -> Result<HdbValue<'static>, SerializationError>

Serialize an f32.

fn serialize_f64( &self, value: f64, ) -> Result<HdbValue<'static>, SerializationError>

Serialize an f64.

fn serialize_char( &self, value: char, ) -> Result<HdbValue<'static>, SerializationError>

Serialize a char.

fn serialize_str( &self, value: &str, ) -> Result<HdbValue<'static>, SerializationError>

Serialize a str.

fn serialize_bytes( &self, value: &[u8], ) -> Result<HdbValue<'static>, SerializationError>

Serialize bytes.

fn serialize_none(&self) -> Result<HdbValue<'static>, SerializationError>

Serialize a none.

fn descriptor(&self) -> String

Provide a descriptive String of the type that is required (for error messages).

impl Debug for ParameterDescriptor

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Display for ParameterDescriptor

fn fmt(&self, fmt: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.