从预先填充的数据库创建时如何向Room实体添加额外的列？

Question

我正在从资产文件夹中的数据库创建会议室数据库。

database = Room.databaseBuilder(this, AppDatabase::class.java, "x.db")
        .createFromAsset("databases/x.db")
        .fallbackToDestructiveMigration()
        .build()

带有实体类

@Entity(tableName = "x")
data class BibleDatas(
        @NotNull @ColumnInfo(name = "age") var name: Int,
        @NotNull @ColumnInfo(name = "name") var age: String,
        @Nullable @ColumnInfo(name = "saved") var saved: Int
        @PrimaryKey(autoGenerate = true) @NotNull @ColumnInfo(name = "id") var id: Int
    )

我的资产文件夹数据库具有列名称和年龄，并且保存的列是动态创建的。

但是出现错误提示

Pre-packaged database has an invalid schema: 
     Expected:
    TableInfo{name='x', columns={age=Column{age='age', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0, defaultValue='null'}, saved=Column{age='saved', type='INTEGER', affinity='3', notNull=false, primaryKeyPosition=0, defaultValue='null'}, name=Column{age='name', type='TEXT', affinity='2', notNull=true, primaryKeyPosition=0, defaultValue='null'}}, foreignKeys=[], indices=[]}
     Found:
    TableInfo{name='x', columns={age=Column{age='age', type='INTEGER', affinity='3', notNull=true, primaryKeyPosition=0, defaultValue='null'}, name=Column{age='name', type='TEXT', affinity='2', notNull=true, primaryKeyPosition=0, defaultValue='null'}}, foreignKeys=[], indices=[]}

Answer 1

检查此解决方案：

Pre-packaged database has an invalid schema error