Android Room-通过自动生成获取新插入行的ID [英] Android Room - Get the id of new inserted row with auto-generate

问题描述

这是我使用Room Persistence Library将数据插入数据库的方式:

This is how I am inserting data into database using Room Persistence Library:

实体:

@Entity
class User {
    @PrimaryKey(autoGenerate = true)
    public int id;
    //...
}

数据访问对象:

@Dao
public interface UserDao{
    @Insert(onConflict = IGNORE)
    void insertUser(User user);
    //...
}

使用上述方法本身完成插入后，是否可以返回User的ID，而无需编写单独的选择查询?

Is it possible to return the id of User once the insertion is completed in the above method itself without writing a separate select query?

推荐答案

基于文档此处(在代码段下方)

Based on the documentation here (below the code snippet)

带有@Insert注释的方法可以返回:

A method annotated with the @Insert annotation can return:

• long用于单次插入操作
• long[]或Long[]或List<Long>用于多次插入操作
• void如果您不在乎插入的ID

• long for single insert operation
• long[] or Long[] or List<Long> for multiple insert operations
• void if you don't care about the inserted id(s)

这篇关于Android Room-通过自动生成获取新插入行的ID的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！