minor file updates

README.md

@@ -8,12 +8,18 @@ This is a SQL database written in Rust. It will be based off of (and hopefully b
 
 ## Feature roadmap
 
-[ ] Table creation via CREATE with varchar & integer datatype
+[X] CREATE TABLE with varchar & integer datatypes
 
-[ ] SELECT * query 
+[X] INSERT INTO (non-batched)
+
+[X] SELECT * query 
+
+[ ] DELETE command
 
 [ ] SELECT (filtered columns) query 
 
+[ ] WHERE clause for SELECT and DELETE
+
 [ ] Primary Keys via B+ Tree
 
 [ ] Foreign Keys
@@ -22,4 +28,4 @@ This is a SQL database written in Rust. It will be based off of (and hopefully b
 
 [ ] Support [Postgres' messaging system](https://www.postgresql.org/docs/current/protocol-flow.html#id-1.10.6.7.3) (wire compatability)
  
-... other stuff is TBD
+... other stuff is TBD

squirrel-server/src/main.rs

@@ -1,4 +1,3 @@
-use std::collections::{HashMap, HashSet};
 use std::fs;
 use std::io::{BufRead, BufReader, Read, Write};
 use std::net::{Shutdown, TcpListener, TcpStream};
@@ -12,8 +11,6 @@ use parser::command::{CreateCommand, InsertCommand, SelectCommand};
 pub use table::datatypes::Datatype;
 pub use table::table::{ColumnDefinition, TableDefinition};
 
-use crate::parser::command::InsertItem;
-
 const BUFFER_SIZE: usize = 500;
 
 fn handle_create(command: CreateCommand) -> ::anyhow::Result<TableDefinition> {
@@ -122,7 +119,7 @@ fn handle_select(command: SelectCommand) -> ::anyhow::Result<String> {
 
 fn run_command(query: String) -> String {
     let response: String;
-    if query.chars().nth(0).unwrap() == '\\' {
+    if query.starts_with('\\') {
         // handle PSQL's slash commands e.g.: \dt \d
         return String::from("Slash commands are not yet supported in SQUIRREL");
     }
@@ -143,7 +140,7 @@ fn run_command(query: String) -> String {
             Command::Insert(insert_command) => {
                 let result = handle_insert(insert_command);
                 if result.is_err() {
-                    String::from(result.err().unwrap().to_string())
+                    result.err().unwrap().to_string()
                 } else {
                     String::from("Data inserted.")
                 }
@@ -161,16 +158,16 @@ fn run_command(query: String) -> String {
 }
 
 fn handle_client(mut stream: TcpStream) {
-    let mut data = [0 as u8; BUFFER_SIZE];
+    let mut data = [0_u8; BUFFER_SIZE];
 
     while match stream.read(&mut data) {
-        Ok(size) => {
+        Ok(_size) => {
             let query_string = String::from_utf8(data.to_vec()).expect("A UTF-8 string");
             let response: String = run_command(query_string);
 
-            let mut response_data_size = response.len().to_le_bytes();
+            let response_data_size = response.len().to_le_bytes();
-            stream.write(&mut response_data_size).unwrap(); // send length of message
+            stream.write_all(&response_data_size).unwrap(); // send length of message
-            stream.write(response.as_bytes()).unwrap(); // send message
+            stream.write_all(response.as_bytes()).unwrap(); // send message
             true
         }
         Err(_) => {
@@ -194,7 +191,6 @@ fn main() -> std::io::Result<()> {
     for stream in listener.incoming() {
         thread::spawn(|| {
             handle_client(stream.expect("A valid stream"));
-            ()
         });
     }
 

squirrel-server/src/parser/command.rs

@@ -78,7 +78,7 @@ pub fn tokenizer(text: String) -> Vec<String> {
         }
 
         if !in_quotes && parts.contains(&cur_char) {
-            if cur_str.len() != 0 {
+            if !cur_str.is_empty() {
                 tokens.push(cur_str);
                 cur_str = String::new();
             }
@@ -90,7 +90,7 @@ pub fn tokenizer(text: String) -> Vec<String> {
         }
     }
 
-    return tokens;
+    tokens
 }
 
 impl Command {
@@ -204,7 +204,7 @@ impl Command {
             }
         }
 
-        return Err(anyhow!("Unexpected end of input"));
+        Err(anyhow!("Unexpected end of input"))
     }
 
     fn parse_select_command(tokens: &mut Vec<String>) -> ::anyhow::Result<Command> {
@@ -243,7 +243,7 @@ impl Command {
             }
         }
 
-        return Err(anyhow!("Unexpected end of input"));
+        Err(anyhow!("Unexpected end of input"))
     }
 
     fn parse_create_command(tokens: &mut Vec<String>) -> ::anyhow::Result<Command> {
@@ -280,7 +280,7 @@ impl Command {
                     state = CreateParserState::FindColumnDatatype;
                 }
                 CreateParserState::FindColumnDatatype => {
-                    let dtype = Datatype::from_str(&token).unwrap();
+                    let dtype = Datatype::from_str(token).unwrap();
                     if dtype.has_len() {
                         state = CreateParserState::FindColumnLength;
                     } else {
@@ -330,7 +330,7 @@ impl Command {
             }
         }
 
-        return Err(anyhow!("Unexpected end of input"));
+        Err(anyhow!("Unexpected end of input"))
     }
 
     pub fn from_string(command_str: String) -> ::anyhow::Result<Command> {
@@ -344,6 +344,7 @@ impl Command {
                 _ => Err(anyhow!("Unknown command '{}'", token)),
             };
         }
-        return Err(anyhow!("Unexpected end of statement"));
+
+        Err(anyhow!("Unexpected end of statement"))
     }
 }

squirrel-server/src/table/datatypes.rs

@@ -33,11 +33,11 @@ impl Datatype {
                 // Remove dquotes
                 str_bytes.remove(0);
                 str_bytes.remove(str_bytes.len() - 1);
-                return Ok(str_bytes);
+                Ok(str_bytes)
             }
             Datatype::Integer => {
                 let val = data_val.parse::<u8>()?;
-                return Ok(vec![val]);
+                Ok(vec![val])
             }
         }
     }
@@ -46,11 +46,11 @@ impl Datatype {
         match self {
             Datatype::CharacterVarying => {
                 let str_val = String::from_utf8(data_val.to_vec())?;
-                return Ok(str_val);
+                Ok(str_val)
             }
             Datatype::Integer => {
                 let val = data_val.first().unwrap();
-                return Ok(format!("{}", val));
+                Ok(format!("{}", val))
             }
         }
     }

squirrel-server/src/table/mod.rs

@@ -1,2 +1,2 @@
-pub mod table;
 pub mod datatypes;
+pub mod table;