test database

src/pages/DatabaseServiceTest.js

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+// src/pages/DatabaseTestPage.js
+import React, {useState, useEffect} from 'react';
+import {
+  View,
+  Text,
+  TextInput,
+  Button,
+  ScrollView,
+  StyleSheet,
+} from 'react-native';
+import {initializeDatabase} from '../utils/DatabaseService';
+
+const DatabaseTestPage = () => {
+  const [db, setDb] = useState(null);
+  const [users, setUsers] = useState([]);
+  const [username, setUsername] = useState('');
+  const [email, setEmail] = useState('');
+
+  useEffect(() => {
+    initializeDatabase().then(database => {
+      setDb(database);
+      fetchUsers(database);
+    });
+  }, []);
+
+  const fetchUsers = database => {
+    database.transaction(tx => {
+      tx.executeSql('SELECT * FROM Users', [], (tx, results) => { m
+        const fetchedUsers = [];
+        for (let i = 0; i < results.rows.length; i++) {
+          fetchedUsers.push(results.rows.item(i));
+        }
+        setUsers(fetchedUsers);
+      });
+    });
+  };
+
+  const addUser = () => {
+    if (db && username && email) {
+      db.transaction(tx => {
+        tx.executeSql(
+          'INSERT INTO Users (username, email, created_at, updated_at) VALUES (?, ?, datetime("now"), datetime("now"))',
+          [username, email],
+          () => {
+            fetchUsers(db);
+            setUsername('');
+            setEmail('');
+          },
+        );
+      });
+    }
+  };
+
+  const deleteUser = userId => {
+    if (db) {
+      db.transaction(tx => {
+        tx.executeSql('DELETE FROM Users WHERE id = ?', [userId], () => {
+          fetchUsers(db);
+        });
+      });
+    }
+  };
+
+  return (
+    <ScrollView style={styles.container}>
+      <View style={styles.form}>
+        <TextInput
+          style={styles.input}
+          placeholder="Username"
+          value={username}
+          onChangeText={setUsername}
+        />
+        <TextInput
+          style={styles.input}
+          placeholder="Email"
+          value={email}
+          onChangeText={setEmail}
+        />
+        <Button title="Add User" onPress={addUser} />
+      </View>
+      <View style={styles.usersList}>
+        {users.map(user => (
+          <View key={user.id} style={styles.userItem}>
+            <Text style={styles.userText}>
+              {user.id}: {user.username} - {user.email}
+            </Text>
+            <Button title="Delete" onPress={() => deleteUser(user.id)} />
+          </View>
+        ))}
+      </View>
+    </ScrollView>
+  );
+};
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    padding: 20,
+    marginTop: 50,
+  },
+  form: {
+    marginBottom: 20,
+  },
+  input: {
+    marginBottom: 10,
+    borderWidth: 1,
+    borderColor: '#ccc',
+    paddingHorizontal: 10,
+    paddingVertical: 5,
+  },
+  usersList: {
+    borderTopWidth: 1,
+    borderColor: '#ccc',
+  },
+  userItem: {
+    flexDirection: 'row',
+    justifyContent: 'space-between',
+    alignItems: 'center',
+    paddingVertical: 10,
+    borderBottomWidth: 1,
+    borderColor: '#ccc',
+  },
+  userText: {
+    fontSize: 16,
+  },
+});
+
+export default DatabaseTestPage;

src/utils/DatabaseService.js

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+// DatabaseService.js
+import SQLite from 'react-native-sqlite-storage';
+
+SQLite.enablePromise(true);
+
+const databaseName = 'MyAccountApp.db';
+const databaseVersion = '1.0';
+const databaseDisplayName = 'My Account App Database';
+const databaseSize = 200000; // 大约 200KB
+
+async function initializeDatabase() {
+  try {
+    const db = await SQLite.openDatabase(
+      databaseName,
+      databaseVersion,
+      databaseDisplayName,
+      databaseSize,
+    );
+
+    await db.transaction(async tx => {
+      // 创建 Users 表
+      await tx.executeSql(
+        'CREATE TABLE IF NOT EXISTS Users (id INTEGER PRIMARY KEY AUTOINCREMENT, username VARCHAR(30), password VARCHAR(30), email VARCHAR(30), created_at DATETIME, updated_at DATETIME)',
+      );
+
+      // 创建 Accounts 表
+      await tx.executeSql(
+        'CREATE TABLE IF NOT EXISTS Accounts (id INTEGER PRIMARY KEY AUTOINCREMENT, user_id INTEGER, name VARCHAR(30), currency VARCHAR(10), balance DECIMAL, created_at DATETIME, updated_at DATETIME)',
+      );
+
+      // 创建 Ledgers 表
+      await tx.executeSql(
+        'CREATE TABLE IF NOT EXISTS Ledgers (id INTEGER PRIMARY KEY AUTOINCREMENT, user_id INTEGER, name VARCHAR(30), created_at DATETIME, updated_at DATETIME)',
+      );
+
+      // 创建 Transactions 表
+      await tx.executeSql(
+        'CREATE TABLE IF NOT EXISTS Transactions (id INTEGER PRIMARY KEY AUTOINCREMENT, ledger_id INTEGER, account_id INTEGER, type VARCHAR(10), amount DECIMAL, currency VARCHAR(10), date DATE, description VARCHAR(255), created_at DATETIME, updated_at DATETIME)',
+      );
+
+      // 创建 FixedExpenses 表
+      await tx.executeSql(
+        'CREATE TABLE IF NOT EXISTS FixedExpenses (id INTEGER PRIMARY KEY AUTOINCREMENT, user_id INTEGER, name VARCHAR(30), amount DECIMAL, frequency VARCHAR(10), created_at DATETIME, updated_at DATETIME)',
+      );
+
+      // 创建 Subscriptions 表
+      await tx.executeSql(
+        'CREATE TABLE IF NOT EXISTS Subscriptions (id INTEGER PRIMARY KEY AUTOINCREMENT, user_id INTEGER, name VARCHAR(30), amount DECIMAL, start_date DATE, end_date DATE, created_at DATETIME, updated_at DATETIME)',
+      );
+
+      // 创建 AAPayments 表
+      await tx.executeSql(
+        'CREATE TABLE IF NOT EXISTS AAPayments (id INTEGER PRIMARY KEY AUTOINCREMENT, user_id INTEGER, event VARCHAR(30), total_amount DECIMAL, participants INTEGER, paid_by INTEGER, created_at DATETIME, updated_at DATETIME)',
+      );
+
+      // 其他表的创建语句...
+    });
+
+    console.log('Database initialized');
+    return db;
+  } catch (error) {
+    console.error('Error initializing database:', error);
+  }
+}
+
+export {initializeDatabase};