native_db_32bit/transaction/query/
len.rs

1use crate::db_type::{DatabaseSecondaryKeyOptions, Input, KeyDefinition, Result};
2use crate::transaction::internal::private_readable_transaction::PrivateReadableTransaction;
3use crate::transaction::internal::r_transaction::InternalRTransaction;
4use crate::transaction::internal::rw_transaction::InternalRwTransaction;
5
6/// Get the number of values in the database.
7pub struct RLen<'db, 'txn> {
8    pub(crate) internal: &'txn InternalRTransaction<'db>,
9}
10
11impl RLen<'_, '_> {
12    /// Get the number of values.
13    ///
14    /// # Example
15    /// ```rust
16    /// use native_db::*;
17    /// use native_model::{native_model, Model};
18    /// use serde::{Deserialize, Serialize};
19    ///
20    /// #[derive(Serialize, Deserialize)]
21    /// #[native_model(id=1, version=1)]
22    /// #[native_db]
23    /// struct Data {
24    ///     #[primary_key]
25    ///     id: u64,
26    /// }
27    ///
28    /// fn main() -> Result<(), db_type::Error> {
29    ///     let mut builder = DatabaseBuilder::new();
30    ///     builder.define::<Data>()?;
31    ///     let db = builder.create_in_memory()?;
32    ///     
33    ///     // Open a read transaction
34    ///     let r = db.r_transaction()?;
35    ///     
36    ///     // Get all values
37    ///     let _number:u64 = r.len().primary::<Data>()?;
38    ///     Ok(())
39    /// }
40    /// ```
41    pub fn primary<T: Input>(&self) -> Result<u64> {
42        let model = T::native_db_model();
43        let result = self.internal.primary_len(model)?;
44        Ok(result)
45    }
46
47    /// **TODO: needs to be implemented**
48    ///
49    /// Get the number of values by secondary key.
50    ///
51    /// Anatomy of a secondary key it is a `enum` with the following structure: `<table_name>Key::<name>`.
52    ///
53    /// If the secondary key is [`optional`](struct.DatabaseBuilder.html#optional) you will
54    /// get all values that have the secondary key set.
55    pub fn secondary<T: Input>(
56        &self,
57        _key_def: impl KeyDefinition<DatabaseSecondaryKeyOptions>,
58    ) -> Result<Option<T>> {
59        todo!()
60    }
61}
62
63pub struct RwLen<'db, 'txn> {
64    pub(crate) internal: &'txn InternalRwTransaction<'db>,
65}
66
67impl RwLen<'_, '_> {
68    /// Get the number of values.
69    ///
70    /// Same as [`RLen::primary()`](struct.RLen.html#method.primary).
71    pub fn primary<T: Input>(&self) -> Result<u64> {
72        let model = T::native_db_model();
73        let result = self.internal.primary_len(model)?;
74        Ok(result)
75    }
76
77    /// Get the number of values by secondary key.
78    ///
79    /// Same as [`RLen::secondary()`](struct.RLen.html#method.secondary).
80    pub fn secondary<T: Input>(
81        &self,
82        _key_def: impl KeyDefinition<DatabaseSecondaryKeyOptions>,
83    ) -> Result<Option<T>> {
84        todo!()
85    }
86}
native_db_32bit/transaction/query/len.rs

native_db_32bit/transaction/query/
len.rs
