Question

我在我的android应用程序中使用两个数据库假设A和B.我想将数据库A的内容复制到数据库B.如何实现？我试着这样。它没有用。请建议解决方案。

 String alter_query3="insert into B.TableName1 select * from  A.TableName2";
     db.execSQL(alter_query3);

Answer 1

首先将ATTACH个数据库添加到另一个数据库，然后使用INSERT INTO ... SELECT ...语法：

-- working on database "A"
ATTACH '/path/to/other/database.db' AS B;
INSERT INTO TableName1 SELECT * FROM B.TableName2;

Answer 2

从数据库A获取数据/内容并制作列表/ arraylist：

public ArrayList<Customer> getCustomerFromA() {
        String sql = "SELECT * FROM " + DB_TABLE.CUSTOMER ;
        ArrayList<Customer> customerList = new ArrayList<Customer>();

        Cursor cursor = dbA.rawQuery(sql, null);
        Customer customer = null;
        if (cursor.moveToFirst()) {
            customer = new Customer();
            customer.setCode(cursor.getString(cursor.getColumnIndex(DB_TABLE.CUSTOMER_CODE)));
            customer.setName(cursor.getString(cursor.getColumnIndex(DB_TABLE.CUSTOMER_NAME)));
            customer.setAddress(cursor.getString(cursor.getColumnIndex(DB_TABLE.CUSTOMER_ADDRESS)));
            customerList.add(customer);
        }
        cursor.close();

        return customerList;
    }

然后进入数据库B：

public void insertCustomerListToB(ArrayList<Customer> customerList) {

    for (Customer customer : customerList) {
        ContentValues cv = new ContentValues();
        cv.put(DB_TABLE.CUSTOMER_CODE, customer.getCode());
        cv.put(DB_TABLE.CUSTOMER_NAME, customer.getName());
        cv.put(DB_TABLE.CUSTOMER_ADDRESS, customer.getAddress());
        dbB.insert(DB_TABLE.CUSTOMER, null, cv);
    }

}

客户是实体类

Answer 3

嗯是的，据我所知，通过这段代码可以实现：

示例：

INSERT INTO db2.tbl SELECT * FROM db1.tbl

如何在sqlite android中将内容从一个数据库复制到另一个数据库？

3 个答案: