Enum vdb::Data

pub enum Data {
    DbString(String),
    DbI32(i32),
    DbDateTime(NaiveDateTime),
}

A basic database system to store key/value pairs with few dependencies.

Examples

use vdb::{Db, Entry, Predicate};
let mut db = Db::new("test-db");
let row_1 = db.add_row(vec![
        Entry::new_string("word", "cocina"),
        Entry::new_string("translation", "cuisine"),
        Entry::new_string("translation", "kitchen"),
]);
let row_2 = db.add_row(vec![
        Entry::new_string("word", "coche"),
        Entry::new_string("translation", "car"),
]);

// Load and save
db.save();
let mut new_db = Db::load("test-db").unwrap();
let row_ids = new_db.find_all_row_ids();
assert_eq!(row_ids.len(), 2);

// Find rows
let row_ids = db.find_row_ids_by_predicate(&vec![Predicate::new_equal_string("word", "coche")], None);
assert_eq!(row_ids, [row_2]);
let entries = db.entries_from_row_ids(&row_ids, &["translation"]);
assert_eq!(entries[0][0], Entry::new_string("translation", "car"));

// Delete
let coche = db.find_first_row_id_by_value("word", &Db::db_string("coche"));
assert_eq!(coche, Some(row_2));
db.delete_rows(&[row_1, row_2]);
let no_coche = db.find_first_row_id_by_value("word", &Db::db_string("coche"));
assert_eq!(no_coche, None);

Data types currently implemented in the database

Variants

DbString(String)DbI32(i32)DbDateTime(NaiveDateTime)

Methods

impl Data

pub fn now() -> Data

Returns new DbDateTime with current time as timestamp

pub fn date(&self) -> Option<String>

Trait Implementations

impl Clone for Data

fn clone(&self) -> Data

Returns a copy of the value.

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

Performs copy-assignment from source.

impl PartialEq<Data> for Data

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

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

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

This method tests for !=.

impl Eq for Data

impl Display for Data

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

Formats the value using the given formatter.

impl Debug for Data

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

Formats the value using the given formatter.

impl Hash for Data

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, 

Feeds a slice of this type into the given [Hasher].

impl Serialize for Data

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

Serialize this value into the given Serde serializer.

impl<'de> Deserialize<'de> for Data

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

Deserialize this value from the given Serde deserializer.