huixiang_app/lib/im/database/hx_database.dart

import 'package:flutter/cupertino.dart';
import 'package:huixiang/im/database/message.dart';
import 'package:huixiang/im/database/migration.dart';
import 'package:sqflite/sqflite.dart';


class HxDatabase {

  Database db;

  void open() async {

    // _migrations.add(Migration(1, 2, (Database database) async {
    //   database.execute('ALTER TABLE `Message` ADD COLUMN `replyId` VARCHAR(20) DEFAULT NULL AFTER `toId`');
    // }));

    await openDatabase(
      'hx.db',
      version: 2,
      onCreate: (Database db, int version) async {
        db.execute('CREATE TABLE IF NOT EXISTS `Message` (`id` INTEGER, `fromId` VARCHAR(20), `toId` VARCHAR(20), `replyId` VARCHAR(20), `content` TEXT, `attach` TEXT, `msgType` INTEGER, `time` VARCHAR(20), `state` INTEGER, `isDelete` INTEGER, PRIMARY KEY (`id`))');
      },
      onConfigure: (database) async {
        await database.execute('PRAGMA foreign_keys = ON');
      },
      onUpgrade: (database, startVersion, endVersion) async {
        await runMigrations(database, startVersion, endVersion, _migrations);
      },
      onOpen: (Database db) {
        this.db = db;
      }
    );
  }

  void close() {
    db.close();
  }

  Future<List<Message>> queryList(userId) {
    if (db == null) {
      return Future.value(<Message>[]);
    }
    String sql = 'SELECT * FROM Message WHERE toId = ? OR fromId = ? GROUP BY toId,fromId ORDER BY time DESC';
    return db.rawQuery(sql, [userId, userId]).then((value) {
      return value.map((e) {
        debugPrint("Message: ${e}");
        return Message.fromJson(e);
      }).toList();
    }, onError: (error) {
      debugPrint("Messageerror: $error");
    });
  }

  Future<List<Message>> queryUList(userId) {
    if (db == null) {
      return Future.value(<Message>[]);
    }
    String sql = 'SELECT * FROM Message WHERE toId = ? OR fromId = ? ORDER BY time DESC';
    return db.rawQuery(sql, [userId, userId]).then((value) {
      return value.map((e) => Message.fromJson(e)).toList();
    }, onError: (error) {
      debugPrint("Messageerror: $error");
    });
  }

  Future<List<Map>> queryListAll() {
    if (db == null) {
      return Future.value();
    }
    String sql = 'SELECT * FROM Message ORDER BY time DESC';
    return db.rawQuery(sql);
  }

  Future<int> deleteAll() async {
    return db.delete("Message");
  }

  update(Map<dynamic, dynamic> message) {

  }

  Future<int> insert(Map message) async {
    if (db == null) {
      return Future.value(0);
    }
    debugPrint("Messageinsert: ${message}");
    return db.insert("Message", message);
  }

  final List<Migration> _migrations = [];

  addMigrations(List<Migration> migrations) {
    _migrations.addAll(migrations);
    return this;
  }

  Future<void> runMigrations(
      final Database migrationDatabase,
      final int startVersion,
      final int endVersion,
      final List<Migration> migrations,
      ) async {
    final relevantMigrations = migrations
        .where((migration) => migration.startVersion >= startVersion)
        .toList()
      ..sort(
              (first, second) => first.startVersion.compareTo(second.startVersion));

    if (relevantMigrations.isEmpty ||
        relevantMigrations.last.endVersion != endVersion) {
      throw StateError(
        'There is no migration supplied to update the database to the current version.'
            ' Aborting the migration.',
      );
    }

    for (final migration in relevantMigrations) {
      await migration.migrate(migrationDatabase);
    }
  }

}