Struct hdbconnect::ParameterDescriptor

pub struct ParameterDescriptor { /* fields omitted */ }

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 nullable(&self) -> bool

👎 Deprecated since 0.22.1:

use ParameterDescriptor::is_nullable()

Tells if the parameter can be NULL.

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: AsRef<str>>(&self, s: S) -> HdbResult<HdbValue<'static>>

Parse an HdbValue from a String.

Errors

HdbError::Deserialization if parsing fails.

Trait Implementations

impl Clone for ParameterDescriptor

pub fn clone(&self) -> ParameterDescriptor

Returns a copy of the value.

pub 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.

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

Serialize a bool.

pub fn from_i8(
    &self,
    value: i8
) -> Result<HdbValue<'static>, SerializationError>

Serialize an i8.

pub fn from_i16(
    &self,
    value: i16
) -> Result<HdbValue<'static>, SerializationError>

Serialize an i16.

pub fn from_i32(
    &self,
    value: i32
) -> Result<HdbValue<'static>, SerializationError>

Serialize an i32.

pub fn from_i64(
    &self,
    value: i64
) -> Result<HdbValue<'static>, SerializationError>

Serialize an i64.

pub fn from_u8(
    &self,
    value: u8
) -> Result<HdbValue<'static>, SerializationError>

Serialize an u8.

pub fn from_u16(
    &self,
    value: u16
) -> Result<HdbValue<'static>, SerializationError>

Serialize an u16.

pub fn from_u32(
    &self,
    value: u32
) -> Result<HdbValue<'static>, SerializationError>

Serialize an u32.

pub fn from_u64(
    &self,
    value: u64
) -> Result<HdbValue<'static>, SerializationError>

Serialize an u64.

pub fn from_f32(
    &self,
    value: f32
) -> Result<HdbValue<'static>, SerializationError>

Serialize an f32.

pub fn from_f64(
    &self,
    value: f64
) -> Result<HdbValue<'static>, SerializationError>

Serialize an f64.

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

Serialize a char.

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

Serialize a str.

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

Serialize bytes.

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

Serialize a none.

pub fn descriptor(&self) -> String

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

impl Debug for ParameterDescriptor

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

Formats the value using the given formatter.

impl Display for ParameterDescriptor

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

Formats the value using the given formatter.