first commit

.gitignore

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+/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "db"
+version = "0.1.0"
+dependencies = [
+ "serde",
+ "serde_json",
+]
+
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+
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+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
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+ "proc-macro2",
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+ "proc-macro2",
+ "quote",
+ "syn",
+]
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+ "ryu",
+ "serde",
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+ "unicode-ident",
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Cargo.toml

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+[package]
+name = "db"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"

infrastructure.md

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+# A High level overview
+
+
+
+Database –> 
+Tables -> has many rows
+
+
+
+### Strucutres
+#### Table 
+* Row[]
+* Index[]
+* pk-key
+* name: Str
+
+#### Row
+* Key
+* Value
+
+#### Index
+* pk-key
+* key
+* direction, asc - desc

readme.md

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+# A homemade database with indexing.

src/database/index.rs

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+
+use serde::{Deserialize, Serialize};
+
+#[derive(Serialize, Deserialize)] 
+pub struct Index {
+  pk: u64,
+  key: String,
+  asd_sort: bool,
+  unique: bool,
+
+}

src/database/mod.rs

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+pub mod index;
+pub mod table;
+pub mod row;

src/database/row.rs

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+use serde_json::Value;
+use std::collections::HashMap;
+use serde::{Deserialize, Serialize};
+
+#[derive(Serialize, Deserialize)] 
+pub struct Row {
+  pub columns: HashMap<String, Value>
+}
+
+impl Row {
+  pub fn new(cols: HashMap<String, Value>) -> Row {
+    Row {columns: cols}
+  }
+}

src/database/table.rs

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+
+use serde::{Deserialize, Serialize};
+use std::{collections::HashMap, fs};
+use super::{index::Index, row::Row};
+
+
+#[derive(Serialize, Deserialize)] 
+pub struct Table {
+  indexes: Vec<Index>,
+  rows: HashMap<u64, Row>,
+  name: String,
+  pk_key: String,
+}
+
+impl Table {
+
+  pub fn new(name: &str, pk_key: &str) -> Table {
+    Table { indexes: vec![], rows: HashMap::new(), name: name.to_string(), pk_key: pk_key.to_string() }
+  }
+
+  pub fn from_file(file_path: String) -> Table {
+    let serialized = fs::read_to_string(file_path);
+    if serialized.is_err() {
+      panic!("Failed loading from file");
+    }
+    let table: Table = serde_json::from_str(&serialized.unwrap()).unwrap();
+    return table;
+  }
+  
+  pub fn to_file(&self, file_path: String) {
+
+    let serialized = serde_json::to_string(self).unwrap();
+    println!("serialized = {}", serialized);
+    let result = fs::write(file_path, serialized);
+    if result.is_err() {
+      panic!("Failed writing table to file")
+    }
+  }
+
+
+  pub fn create_index(&mut self, index: Index) {
+    self.indexes.push(index)
+  }
+
+  pub fn find_by_pk(&self, value: &u64) -> &Row {
+    let row = self.rows.get(value);
+    if row.is_none() {
+      panic!("Row not found!");
+    }
+    return row.unwrap().clone();
+  }
+
+  pub fn insert_row(&mut self, row: Row) {
+    let key_option = row.columns.get(&self.pk_key);
+    
+    if key_option.is_none() {
+      panic!("Primary key not found on row to insert!");
+    }
+    
+    let key = key_option.unwrap().as_u64();
+    
+    if key.is_none() {
+      panic!("Primary key is not of type u64");
+    }
+
+    self.rows.insert(key.unwrap(), row);
+  }
+}
+

src/main.rs

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+use serde_json::Value;
+
+macro_rules! hashmap {
+    ($( $key: expr => $val: expr ),*) => {{
+         let mut map: ::std::collections::HashMap<String, Value> = ::std::collections::HashMap::new();
+         $( map.insert($key.to_string(), serde_json::to_value($val).unwrap()); )*
+         map
+    }}
+}
+use database::{table::Table, row::Row};
+
+mod database;
+
+
+
+fn main() {
+    let mut table: Table = Table::new("Cats", "id");
+    table.insert_row(Row::new(hashmap!["id" => 1, "name" => "Ozzy"]));
+    table.insert_row(Row::new(hashmap!["id" => 2, "name" => "Simon"]));
+
+    let row = table.find_by_pk(&1u64);
+    let pretty_print = serde_json::to_string_pretty(row);
+    
+    println!("Found Row: {}", pretty_print.unwrap());
+    let row = table.find_by_pk(&2u64);
+    let pretty_print = serde_json::to_string_pretty(row);
+    
+    println!("Found Row: {}", pretty_print.unwrap());
+    let row = table.find_by_pk(&3u64);
+    let pretty_print = serde_json::to_string_pretty(row);
+    
+    println!("Failed to Find Row: {}", pretty_print.unwrap());
+
+}