Struct Predicate

pub struct Predicate {
    pub predicate_type: PredicateType,
    pub entry: Entry,
}

Used to compare database entries, e. g. in queries (fn find_*)

Examples

use vdb::{Entry,Predicate};
let a = Entry::new_string("mundo", "world");

assert_eq!(a.compare(&Predicate::new_equal_string("mundo", "world")), true);
assert_eq!(a.compare(&Predicate::new_starts_with("mundo", "worl")), true);
assert_eq!(a.compare(&Predicate::new_contains("mundo", "orl")), true);
assert_eq!(a.compare(&Predicate::new_equal_string("mundo", "planet")), false);

Fields

predicate_type: PredicateType

entry: Entry

Implementations

impl Predicate

pub fn new_equal_i32(name: &str, value: i32) -> Predicate

Shortcut for creating a new Predicate that tests for equality with a DbI32

pub fn new_any_string(name: &str) -> Predicate

Shortcut for creating a new Predicate that searches database for DbStrings equal to value

pub fn new_equal_string(name: &str, value: &str) -> Predicate

Shortcut for creating a new Predicate that searches database for DbStrings equal to value

pub fn new_starts_with(name: &str, value: &str) -> Predicate

Shortcut for creating a new Predicate that searches database for DbStrings starting with value

pub fn new_contains(name: &str, value: &str) -> Predicate

Shortcut for creating a new Predicate that searches database for DbStrings that contain value

Trait Implementations

impl Debug for Predicate

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

Formats the value using the given formatter.