35 lines
1.6 KiB
Rust
35 lines
1.6 KiB
Rust
use rusqlite::{Connection, Error, params};
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pub struct KeyValueTable<'a> {
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db: Connection,
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table_name: &'a str,
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}
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impl<'a> KeyValueTable<'a> {
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pub fn new(db_path: &str, table_name: &'a str) -> Result<KeyValueTable<'a>, Error> {
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let db = Connection::open(db_path)?;
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db.execute(&format!("CREATE TABLE IF NOT EXISTS {} (key TEXT PRIMARY KEY, value BLOB)", table_name), [])?;
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Ok(KeyValueTable {db, table_name})
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}
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pub fn set(&self, key: &str, value: &[u8]) -> Result<usize, Error> {
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Ok(self.db.execute(&format!("INSERT INTO {} (key, value) VALUES (?1, ?2)", self.table_name), params![key, value])?)
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}
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pub fn get(&self, key: &str) -> Result<Vec<u8>, Error> {
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let mut stmt = self.db.prepare(&format!("SELECT value FROM {} WHERE key=\"{}\"", self.table_name, key))?;
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let mut rows = stmt.query([])?;
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match rows.next()? {
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Some(row) => Ok(row.get(0)?),
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None => Err(rusqlite::Error::QueryReturnedNoRows)
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}
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}
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/*pub fn del(&self, key: &str) -> Result<usize, Error> {
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self.db.execute(&format!("DELETE FROM {} WHERE key=\"{}\"", self.table_name, key), NO_PARAMS)
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}*/
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pub fn update(&self, key: &str, value: &[u8]) -> Result<usize, Error> {
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self.db.execute(&format!("UPDATE {} SET value=? WHERE key=\"{}\"", self.table_name, key), params![value])
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}
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/*pub fn upsert(&self, key: &str, value: &[u8]) -> Result<usize, Error> {
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self.db.execute(&format!("INSERT INTO {} (key, value) VALUES(?1, ?2) ON CONFLICT(key) DO UPDATE SET value=?3", self.table_name), params![key, value, value])
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}*/
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}
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