add sqlite module and database manage module

@@ -93,7 +93,7 @@ const styles = StyleSheet.create({
     },
     infoContainer:{
         flexDirection:'row',
-        justifyContent:'space-around',
+        justifyContent:'center',
         alignItems:'center',
         width: '100%'
     },

+import * as SQLite from 'expo-sqlite';
+import { Modal } from 'react-native';
+import { openDatabase,transaction,executeSql } from 'expo-sqlite';
+import { rejects } from 'assert';
+
+
+let sqlite = {};
+let db = openDatabase("score.db");
+db.transaction( ( tx ) => {
+    tx.executeSql(`CREATE TABLE IF NOT EXISTS district (id int AUTO_INCREMENT,score int, PRIMARY KEY (id));`);
+});
+
+sqlite.insert = ( score ) => {
+    db.transaction( ( tx ) => {
+        tx.executeSql( `INSERT INTO district (score) VALUES (${score});` );
+    });
+}
+
+
+sqlite.select = ( ) => {
+    return new Promise( (resolve ,rejects)=>{
+        db.transaction( ( tx ) => {
+            tx.executeSql( `SELECT score FROM district WHERE 1 ORDER BY id DESC LIMIT 5;`, [], ( tx, result ) => {
+                resolve(result.rows._array);
+            }, ( err )=>{
+                console.log("err -> ",err);
+            });
+        });
+    })
+    
+}
+
+module.exports = sqlite;
\ No newline at end of file

@@ -31,7 +31,8 @@
     "react-redux": "^7.1.3",
     "react-thunk": "^1.0.0",
     "redux": "^4.0.4",
-    "redux-thunk": "^2.3.0"
+    "redux-thunk": "^2.3.0",
+    "expo-sqlite": "~7.0.0"
   },
   "devDependencies": {
     "babel-preset-expo": "^7.1.0",