diff --git a/backend/user.rs b/backend/user.rs
index 35380c5..f3a57cb 100644
--- a/backend/user.rs
+++ b/backend/user.rs
@@ -1,4 +1,18 @@
 use sqlite::Connection;
+use sqlite::State;
+
+pub struct User {
+    name: String,
+    level: u32,
+    password: String,
+}
+
+impl User {
+    pub fn open(name: String, level: u32, password: String) -> User {
+        User {name, level, password}
+    }
+}
+
 
 pub struct DataBase {
     connection: Connection,
@@ -10,22 +24,41 @@ impl DataBase {
         DataBase { connection }
     }
 
-    pub fn data_execute(&self, arg: String){
+    fn execute(&self, arg: String){
         match self.connection.execute(arg){
-            OK => println!("Ok"),
+            _ => (),
             Err(e) => panic!("Error : {}",e),
         }
     }
 
     pub fn create_table(&self, table: &str, var: &str){
-        self.data_execute("CREATE TABLE ".to_owned() + &table.to_string() + "(" + &var.to_string() + ");");
+        self.execute("CREATE TABLE ".to_owned() + &table.to_string() + "(" + &var.to_string() + ");");
     }
 
     pub fn add_column(&self, table: &str, arg: &str){
-        self.data_execute("ALTER TABLE ".to_owned() + &table.to_string() + " ADD " + &arg.to_string() + ";");
+        self.execute("ALTER TABLE ".to_owned() + &table.to_string() + " ADD " + &arg.to_string() + ";");
     }
 
     pub fn insert(&self, table: &str, arg: &str){
-        self.data_execute("INSERT INTO ".to_owned() + &table.to_string() + " VALUES (" + &arg.to_string() + ")" + ";");
+        self.execute("INSERT INTO ".to_owned() + &table.to_string() + " VALUES (" + &arg.to_string() + ")" + ";");
+    }
+
+    pub fn check(&self, table: &str, arg: &str) -> bool {
+    let mut end = false;
+    self.connection.iterate("Select name FROM ".to_owned() + &table.to_string() + " WHERE name = " + &arg.to_string(), |pairs| {
+        for &(name, value) in pairs.iter() {
+            println!("{} = {}", name, value.unwrap());
+            if name == "name" {
+                println!("True");
+                end = true;
+            }
+        }
+        return end;
+    });   
+    return end;
+    }
+
+    pub fn update(&self, table: &str, arg: &str, where_is: &str, arg2: &str){
+        self.execute("UPDATE ".to_owned() + &table.to_string() + " SET " + &arg.to_string() + " WHERE " + &where_is.to_string() + " = " + &arg2.to_string());
     }
 }
\ No newline at end of file