akshitgaur2005.tngl.sh
A personal finance tracker
Initial Commit
+370
+1
.gitignore
+1
.gitignore
···
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target/*
+265
Cargo.lock
+265
Cargo.lock
···
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+7
Cargo.toml
+7
Cargo.toml
+95
src/main.rs
+95
src/main.rs
···
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use std::env;
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use rusqlite::{params, Connection, Result};
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fn main() -> Result<()> {
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let args: Vec<String> = env::args().collect();
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println!("{args:#?}");
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let mut conn = Connection::open("storage.db")?;
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Ok(())
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}
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fn create_database(conn: &Connection) -> Result<()> {
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conn.execute(
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"CREATE TABLE IF NOT EXISTS accounts (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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name TEXT NOT NULL,
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balance REAL NOT NULL,
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tags TEXT
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)",
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[],
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)?;
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conn.execute(
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"CREATE TABLE IF NOT EXISTS transactions (
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id INTEGER PRIMARY KEY AUTOINCREMENT,
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sender_id INTEGER NOT NULL,
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receiver_id INTEGER NOT NULL,
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amount REAL NOT NULL,
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timestamp TEXT NOT NULL,
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FOREIGN KEY(sender_id) REFERENCES accounts(id),
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FOREIGN KEY(receiver_id) REFERENCES accounts(id)
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)",
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[],
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)?;
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Ok(())
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}
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fn create_account(conn: &Connection, name: &str, tags: Vec<String>) -> Result<()> {
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let tags = if tags.is_empty() {
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None
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} else {
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Some(tags.join(","))
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};
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conn.execute(
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"INSERT INTO accounts (name, balance, tags) VALUES (?1, 0.0, ?2)",
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params![name, tags],
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)?;
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Ok(())
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}
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fn create_transaction(
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conn: &mut Connection,
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sender_id: i64,
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receiver_id: i64,
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amount: f64,
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) -> Result<()> {
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let tx = conn.transaction()?;
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// 1. Ensure sender has sufficient balance
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let sender_balance: f64 = tx.query_row(
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"SELECT balance FROM accounts WHERE id = ?1",
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params![sender_id],
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|row| row.get(0),
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)?;
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if sender_balance < amount {
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// Any error causes rollback
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return Err(rusqlite::Error::ExecuteReturnedResults);
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}
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// 2. Insert transaction record
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tx.execute(
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"INSERT INTO transactions (sender_id, receiver_id, amount, timestamp)
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VALUES (?1, ?2, ?3, datetime('now'))",
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params![sender_id, receiver_id, amount],
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)?;
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// 3. Debit sender
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tx.execute(
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"UPDATE accounts SET balance = balance - ?1 WHERE id = ?2",
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params![amount, sender_id],
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)?;
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// 4. Credit receiver
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tx.execute(
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"UPDATE accounts SET balance = balance + ?1 WHERE id = ?2",
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params![amount, receiver_id],
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)?;
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tx.commit()?;
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Ok(())
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}
storage.db
storage.db
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