Struct taos_query::common::Field

pub struct Field { /* private fields */ }

A Field represents the name and data type of one column or tag.

For example, a table as “create table tb1 (ts timestamp, n nchar(100))”.

When query with “select * from tb1”, you will get two fields:

1. { name: "ts", ty: Timestamp, bytes: 8 }, a TIMESTAMP field with name ts, bytes length 8 which is the byte-width of i64.
2. { name: "n", ty: NChar, bytes: 100 }, a NCHAR filed with name n, bytes length 100 which is the length of the variable-length data.

Implementations

impl Field

pub const fn empty() -> Self

pub fn new(name: impl Into<String>, ty: Ty, bytes: u32) -> Self

pub fn name(&self) -> &str

Field name.

pub fn escaped_name(&self) -> String

Escaped file name

pub const fn ty(&self) -> Ty

Data type of the field.

pub const fn bytes(&self) -> u32

Preset length of variable length data type.

It’s the byte-width in other types.

pub fn to_c_field(&self) -> c_field_t

pub fn sql_repr(&self) -> String

Represent the data type in sql.

For example: “INT”, “VARCHAR(100)”.

Trait Implementations

impl Clone for Field

fn clone(&self) -> Field

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Field

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Field

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for Field

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

Formats the value using the given formatter.

impl From<&Field> for c_field_t

fn from(value: &Field) -> Self

Converts to this type from the input type.

impl From<ColField> for Field

fn from(f: ColField) -> Self

Converts to this type from the input type.

impl Hash for Field

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Inlinable for Field

fn write_inlined<W: Write>(&self, wtr: &mut W) -> Result<usize>

Write inlined bytes to a writer.

fn read_inlined<R: Read>(reader: &mut R) -> Result<Self>

Read inlined bytes into object.

fn read_optional_inlined<R: Read>(reader: &mut R) -> Result<Option<Self>>where Self: Sized,

fn write_inlined_with<W: Write>( &self, wtr: &mut W, _opts: InlineOpts ) -> Result<usize>

Write inlined bytes with specific options

fn inlined(&self) -> Vec<u8>

Get inlined bytes as vector.

fn printable_inlined(&self) -> String

Get inlined bytes as printable string, all the bytes will displayed with escaped ascii code.

impl PartialEq<Field> for Field

fn eq(&self, other: &Field) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for Field

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for Field

impl StructuralEq for Field

impl StructuralPartialEq for Field