diff --git a/Cargo.lock b/Cargo.lock
index 86e7b92..20e07aa 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1334,6 +1334,7 @@ dependencies = [
  "async-trait",
  "atty",
  "bindgen",
+ "bytes",
  "c_fixed_string",
  "cfg-if 1.0.0",
  "chrono",
diff --git a/Cargo.toml b/Cargo.toml
index 406af0d..5e80f51 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,6 +8,7 @@ edition = "2018"
 [dependencies]
 async-trait = { version = "0.1", optional = true }
 atty = "0.2"
+bytes = { version = "1.2", optional = true }
 c_fixed_string = { version = "0.2", optional = true }
 cfg-if = "1"
 chrono = "0.4"
@@ -46,7 +47,7 @@ cmake = { version = "0.1", optional = true }
 [features]
 all = ["db", "db_sqlite", "exif", "ugoira", "server"]
 avdict = ["bindgen", "cmake", "flagset"]
-db = []
+db = ["bytes"]
 db_all = ["db", "db_sqlite"]
 db_sqlite = ["rusqlite"]
 exif = ["bindgen", "c_fixed_string", "cmake", "link-cplusplus", "utf16string"]
diff --git a/src/db/mod.rs b/src/db/mod.rs
index 13f9ea5..c0edbaa 100644
--- a/src/db/mod.rs
+++ b/src/db/mod.rs
@@ -2,6 +2,7 @@ pub mod config;
 #[cfg(feature = "db_sqlite")]
 pub mod sqlite;
 pub mod traits;
+pub mod user;
 
 pub use config::check_db_config;
 pub use config::PixivDownloaderDbConfig;
@@ -10,6 +11,7 @@ pub use config::PixivDownloaderSqliteConfig;
 #[cfg(feature = "db_sqlite")]
 pub use sqlite::{PixivDownloaderSqlite, SqliteError};
 pub use traits::PixivDownloaderDb;
+pub use user::User;
 pub type PixivDownloaderDbError = Box<dyn std::fmt::Display + Send + Sync>;
 
 use crate::{get_helper, gettext};
diff --git a/src/db/sqlite/db.rs b/src/db/sqlite/db.rs
index 3de3702..3fbcc0d 100644
--- a/src/db/sqlite/db.rs
+++ b/src/db/sqlite/db.rs
@@ -1,9 +1,11 @@
 use super::super::{
-    PixivDownloaderDb, PixivDownloaderDbConfig, PixivDownloaderDbError, PixivDownloaderSqliteConfig,
+    PixivDownloaderDb, PixivDownloaderDbConfig, PixivDownloaderDbError,
+    PixivDownloaderSqliteConfig, User,
 };
 use super::SqliteError;
+use bytes::BytesMut;
 use futures_util::lock::Mutex;
-use rusqlite::{Connection, OpenFlags, Transaction};
+use rusqlite::{Connection, OpenFlags, OptionalExtension, Transaction};
 use std::collections::HashMap;
 
 const AUTHORS_TABLE: &'static str = "CREATE TABLE authors (
@@ -169,6 +171,23 @@ impl PixivDownloaderSqlite {
         Ok(tables)
     }
 
+    async fn _get_user(&self, id: u64) -> Result<Option<User>, SqliteError> {
+        let con = self.db.lock().await;
+        Ok(con
+            .query_row("SELECT * FROM users WHERE id = ?;", [id], |row| {
+                let password: Vec<u8> = row.get(3)?;
+                let password: &[u8] = &password;
+                Ok(User {
+                    id: row.get(0)?,
+                    name: row.get(1)?,
+                    username: row.get(2)?,
+                    password: BytesMut::from(password),
+                    is_admin: row.get(4)?,
+                })
+            })
+            .optional()?)
+    }
+
     async fn _read_version(&self) -> Result<Option<[u8; 4]>, SqliteError> {
         let con = self.db.lock().await;
         let mut stmt = con.prepare("SELECT v1, v2, v3, v4 FROM version WHERE id='main';")?;
@@ -220,6 +239,10 @@ impl PixivDownloaderDb for PixivDownloaderSqlite {
         }
     }
 
+    async fn get_user(&self, id: u64) -> Result<Option<User>, PixivDownloaderDbError> {
+        Ok(self._get_user(id).await?)
+    }
+
     async fn init(&self) -> Result<(), PixivDownloaderDbError> {
         if !self._check_database().await? {
             self._create_table().await?;
diff --git a/src/db/traits.rs b/src/db/traits.rs
index 07e8a07..379f4fd 100644
--- a/src/db/traits.rs
+++ b/src/db/traits.rs
@@ -1,14 +1,19 @@
 use super::PixivDownloaderDbConfig;
 use super::PixivDownloaderDbError;
+use super::User;
 
 #[async_trait]
 pub trait PixivDownloaderDb {
     /// Create a new instance of database
+    /// * `cfg` - The database configuration
     fn new<R: AsRef<PixivDownloaderDbConfig> + ?Sized>(
         cfg: &R,
     ) -> Result<Self, PixivDownloaderDbError>
     where
         Self: Sized + Send + Sync;
+    /// Get a user by ID
+    /// * `id`: The user's ID
+    async fn get_user(&self, id: u64) -> Result<Option<User>, PixivDownloaderDbError>;
     /// Initialize the database (create tables, migrate data, etc.)
     async fn init(&self) -> Result<(), PixivDownloaderDbError>;
 }
diff --git a/src/db/user.rs b/src/db/user.rs
new file mode 100644
index 0000000..fe99be9
--- /dev/null
+++ b/src/db/user.rs
@@ -0,0 +1,15 @@
+use bytes::BytesMut;
+
+/// A user in the database
+pub struct User {
+    /// The user ID
+    pub id: u64,
+    /// The user's name
+    pub name: String,
+    /// Unique user name
+    pub username: String,
+    /// hashed password
+    pub password: BytesMut,
+    /// Whether the user is an admin
+    pub is_admin: bool,
+}