Question

flutter sqflite 0.13.0 + 1显示错误，如何解决此问题？
错误消息

I / flutter（8455）：NoSuchMethodError：方法“ rawInsert”在null上被调用。 I / flutter（8455）：接收者：null I / flutter（8455）：尝试调用：rawInsert（“ INSERT INTO Cart（name）VALUES（\” some name \“）”） E / SQLiteLog（8455）：（1802）os_unix.c：29877：（2）stat（/data/data/com.example.myflutterapp1/databases/demo.db）- E / SQLiteLog（8455）：（1802）语句在18时中止：[SELECT * FROM Cart]磁盘I / O错误 E / SQLiteQuery（8455）：异常：磁盘I / O错误（代码1802）；查询：SELECT * FROM购物车 I / flutter（8455）：DatabaseException（磁盘I / O错误（代码1802））sql'SELECT * FROM Cart'args []}

 addtocart_new() async {
// Get a location using getDatabasesPath
var databasesPath = await getDatabasesPath();
String path = join(databasesPath, 'demo.db');

// Delete the database

//等待deleteDatabase（path）;

// open the database
Database database = await openDatabase(path, version: 1,
    onCreate: (Database db, int version) async {
  // When creating the db, create the table
  await db.execute(
      'CREATE TABLE IF NOT EXISTS Cart (id INTEGER PRIMARY KEY,push_key text, name TEXT, value INTEGER, num REAL,v1 INTEGER,v2 INTEGER,v3 INTEGER,v4 INTEGER,v5 INTEGER)');
});

if (database != null) {
  // Insert some records in a transaction
  {
    try {
      await database.transaction((txn) async {
        int id1 = await txn
            .rawInsert('INSERT INTO Cart(name ) VALUES("some name" )');
        print('inserted1: $id1');
      });
    } catch (e) {
      print(e);
    }
  }
  // Get the records
  try {
    List<Map> list = await database.rawQuery('SELECT * FROM Cart');
    print(list);
  } catch (e) {
    print(e);
  }
} else {
  print("database is null");
}

} }

颤动sqflite 0.13.0 + 1显示错误

0 个答案: