Struct Read 

pub struct Read {
    pub table_name: ValueOrGlob<String>,
    pub column_name: ValueOrGlob<String>,
}

Selector for column-level read operations, scoped to a table and column.

When both fields are globs, this matches all read operations across the entire database. Specifying a table_name narrows the scope to a single table, and additionally specifying a column_name narrows it to one column.

String syntax examples

• Read – all tables, all columns.
• Read(Students) – the Students table, all columns.
• Read(Students.name) – only the name column of Students.
• Read(*.name) – the name column across every table.

Fields

table_name: ValueOrGlob<String>

The target table name, or * to match any table.

column_name: ValueOrGlob<String>

The target column name, or * to match any column.

Implementations

impl Read

pub fn new( table_name: impl Into<ValueOrGlob<String>>, column_name: impl Into<ValueOrGlob<String>>, ) -> Self

Creates a new Read with the provided field values.

Each argument accepts any type that implements Into<ValueOrGlob<T>>, so callers can pass a raw value, a ValueOrGlob, or an Option<T>.

pub fn empty() -> Self

Creates a Read where every field is a Glob, matching all possible values.

pub fn with_table_name(self, value: impl Into<ValueOrGlob<String>>) -> Self

Sets Read::table_name and returns self for method chaining.

The target table name, or * to match any table.

pub fn with_column_name(self, value: impl Into<ValueOrGlob<String>>) -> Self

Sets Read::column_name and returns self for method chaining.

The target column name, or * to match any column.

pub const fn is_all_glob(&self) -> bool

Returns true if every field on this Read is a Glob.

pub const fn is_all_value(&self) -> bool

Returns true if every field on this Read is a Value.

pub const fn is_any_glob(&self) -> bool

Returns true if at least one field on this Read is a Glob.

pub const fn is_any_value(&self) -> bool

Returns true if at least one field on this Read is a Value.

pub const fn specificity(&self) -> usize

Returns the number of Value fields on this Read, used to rank competing policy rules during resolution. A higher specificity means the rule targets a narrower set of operations.

pub fn matches( &self, table_name: &(impl PartialEq<String> + ?Sized), column_name: &(impl PartialEq<String> + ?Sized), ) -> bool

Returns true if this selector covers the given field values. A Glob field matches any value; a Value field matches only when equal.

Trait Implementations

impl Clone for Read

fn clone(&self) -> Read

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Read

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

Formats the value using the given formatter.

impl Default for Read

Defaults to Read::empty, producing a selector where every field is a glob.

fn default() -> Self

Returns the “default value” for a type.

impl Display for Read

Formats this Read using the CLI selector syntax. When all fields are globs, renders the bare identifier Read; otherwise renders the identifier with parenthesized dot-separated fields.

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

Formats the value using the given formatter.

impl From<Read> for AccessControlSelector

Converts a Read into its corresponding AccessControlSelector variant.

fn from(value: Read) -> Self

Converts to this type from the input type.

impl From<Read> for String

Converts a Read into its string representation via Display.

fn from(value: Read) -> Self

Converts to this type from the input type.

impl FromStr for Read

Parses a selector string into a Read. Accepts the syntax Read or Read(field1.field2).

type Err = AccessControlSelectorParseError

The associated error which can be returned from parsing.

fn from_str(s: &str) -> Result<Self, Self::Err>

Parses a string s to return a value of this type.

impl Hash for Read

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 Ord for Read

fn cmp(&self, other: &Read) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Read

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

Tests for self and other values to be equal, and is used by ==.

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

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

impl PartialOrd for Read

fn partial_cmp(&self, other: &Read) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl TryFrom<String> for Read

Parses an owned String into a Read by delegating to FromStr.

type Error = AccessControlSelectorParseError

The type returned in the event of a conversion error.

fn try_from(v: String) -> Result<Self, Self::Error>

Performs the conversion.

impl Eq for Read

impl StructuralPartialEq for Read