问题描述
我正在开发一个android应用程序，并在我的应用程序中实现了Room Database。我的应用程序已经在playstore上运行了，因为现在我正尝试将更新发送到架构发生更改的应用程序。我已经添加了新列，它的类型是字符串，并且应该不为空，所以我将为其提供默认值。
问题：为什么期望 modifyDate 列notNull = false，但我希望它不为NULL。我没有发现Expect和Found部分期望notNull状态和值有任何区别
我找不到此崩溃的真正原因。
下面是我的代码：
@Keep
@Entity
class PdfFile() {
//Columns before migration
@PrimaryKey(autoGenerate = true)
private var mid = 0
private var mFile_name: String? = null
private var mFile_size = "0mb"
private var mFileDate = "17-06-2020"
private var mParent_file = ""
private var mAbsolute_path: String? = null
private var fileType = ""
private var isViewed = false
private var isBookmarked = false
//TEST MIGRATION
@ColumnInfo(name = "modifyDate")
private var modifyDate = ""
fun setMid(mid: Int) {
this.mid = mid
}
fun getMid(): Int {
return mid
}
fun getMFile_name(): String? {
return mFile_name
}
fun getMFile_size(): String {
return mFile_size
}
fun getMFileDate(): String {
return mFileDate
}
fun getMParent_file(): String {
return mParent_file
}
fun getMAbsolute_path(): String? {
return mAbsolute_path
}
fun getFileType(): String {
return fileType
}
fun getIsViewed(): Boolean {
return isViewed
}
fun getIsBookmarked(): Boolean {
return isBookmarked
}
fun getModifyDate(): String {
return modifyDate
}
fun setMFile_name(name: String) {
this.mFile_name = name
}
fun setMFile_size(size: String) {
this.mFile_size = size
}
fun setMFileDate(date: String) {
this.mFileDate = date
}
fun setMParent_file(parentFile: String) {
this.mParent_file = parentFile
}
fun setMAbsolute_path(path: String) {
this.mAbsolute_path = path
}
fun setFileType(fileType: String) {
this.fileType = fileType
}
fun setIsViewed(isView: Boolean) {
this.isViewed = isView
}
fun setIsBookmarked(isBookmark: Boolean) {
this.isBookmarked = isBookmark
}
fun setModifyDate(date: String) {
this.modifyDate = date
}
override fun equals(obj: Any?): Boolean {
return if (obj !is PdfFile) {
false
} else {
val PdfFile = obj as PdfFile
mFile_name == PdfFile.getMFile_name()
&& mAbsolute_path == PdfFile.getMAbsolute_path()
&& mFile_size == PdfFile.getMFile_size()
}
}
}
房间数据库类
//Please note the prevIoUs version was 1 Now i have changed to 2 after adding a new column to entity
@Database(
entities = [PdfFile::class],version = 2,exportSchema = false
)
abstract class RoomDbData : RoomDatabase() {
abstract fun taskDao(): DataDao
}
DatabaseManager类
const val DATABASE_NAME = “MyDb”
class DatabaseManager(context: Context) {
//Migrating from version 1 to version 2
val MIGRATION_1_2 = object : Migration(1,2) {
override fun migrate(database: SupportsqliteDatabase) {
database.execsql("ALTER TABLE PdfFile ADD COLUMN modifyDate TEXT NOT NULL DEFAULT '' ")
}
}
val appDatabase: RoomDbData
init {
appDatabase =
Room.databaseBuilder(context,RoomDbData::class.java,DATABASE_NAME)
.allowMainThreadQueries()
.addMigrations(MIGRATION_1_2)
.build()
}
}
EXCEPTION
Process: mypackagename,PID: 10993
java.lang.RuntimeException: Exception while computing database live data.
at androidx.room.RoomTrackingLiveData$1.run(RoomTrackingLiveData.java:92)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
at java.lang.Thread.run(Thread.java:764)
Caused by: java.lang.IllegalStateException: Migration didn't properly handle: PdfFile(mypackagename.models.entities.PdfFile).
Expected:
TableInfo{name='PdfFile',columns={isBookmarked=Column{name='isBookmarked',type='INTEGER',affinity='3',notNull=true,primaryKeyPosition=0,defaultValue='null'},modifyDate=Column{name='modifyDate',type='TEXT',affinity='2',notNull=false,mFile_size=Column{name='mFile_size',mid=Column{name='mid',primaryKeyPosition=1,mFileDate=Column{name='mFileDate',mAbsolute_path=Column{name='mAbsolute_path',mParent_file=Column{name='mParent_file',mFile_name=Column{name='mFile_name',fileType=Column{name='fileType',isViewed=Column{name='isViewed',defaultValue='null'}},foreignKeys=[],indices=[]}
Found:
TableInfo{name='PdfFile',defaultValue=''''},indices=[]}
at androidx.room.RoomOpenHelper.onUpgrade(RoomOpenHelper.java:103)
at androidx.sqlite.db.framework.FrameworksqliteOpenHelper$OpenHelper.onUpgrade(FrameworksqliteOpenHelper.java:124)
at android.database.sqlite.sqliteOpenHelper.getDatabaseLocked(sqliteOpenHelper.java:299)
at android.database.sqlite.sqliteOpenHelper.getWritableDatabase(sqliteOpenHelper.java:194)
at androidx.sqlite.db.framework.FrameworksqliteOpenHelper$OpenHelper.getWritableSupportDatabase(FrameworksqliteOpenHelper.java:92)
at androidx.sqlite.db.framework.FrameworksqliteOpenHelper.getWritableDatabase(FrameworksqliteOpenHelper.java:53)
at androidx.room.RoomDatabase.inTransaction(RoomDatabase.java:476)
at androidx.room.RoomDatabase.assertNotSuspendingTransaction(RoomDatabase.java:281)
2020-10-20 15:14:41.031 10993-11039/mypackagename E/AndroidRuntime: at androidx.room.RoomDatabase.query(RoomDatabase.java:324)
at androidx.room.util.DBUtil.query(DBUtil.java:83)
at mypackagename.models.dao.DataDao_Impl$13.call(DataDao_Impl.java:325)
at mypackagename.models.dao.DataDao_Impl$13.call(DataDao_Impl.java:322)
at androidx.room.RoomTrackingLiveData$1.run(RoomTrackingLiveData.java:90)
... 3 more
2020-10-20 15:14:41.064 1764-1833/? E/Inputdispatcher: channel 'f088a5d mypackagename/mypackagename.views.activities.MainActivity (server)' ~ Channel is unrecoverably broken and will be disposed!
2020-10-20 15:14:41.067 1764-1833/? E/Inputdispatcher: channel '1aca3d4 mypackagename/mypackagename.views.activities.SplashActivity (server)' ~ Channel is unrecoverably broken and will be disposed!
2020-10-20 15:14:41.110 1764-4588/? E/eglCodecCommon: glutilsParamSize: unkNow param 0x00008cdf
2020-10-20 15:14:41.111 1764-4588/? E/eglCodecCommon: glutilsParamSize: unkNow param 0x00008cdf
2020-10-20 15:14:41.111 1764-4588/? E/eglCodecCommon: glutilsParamSize: unkNow param 0x00008824
2020-10-20 15:14:41.111 1764-4588/? E/eglCodecCommon: glutilsParamSize: unkNow param 0x00008824
2020-10-20 15:14:41.233 1541-4743/? E/audioflinger: not enough memory for AudioTrack size=131296
2020-10-20 15:14:41.233 1541-4743/? E/audioflinger: createRecordTrack_l() initCheck Failed -12; no control block?
2020-10-20 15:14:41.233 2486-7131/? E/AudioRecord: audioflinger Could not create record track,status: -12
2020-10-20 15:14:41.236 2486-7131/? E/AudioRecord-JNI: Error creating AudioRecord instance: initialization check Failed with status -12.
2020-10-20 15:14:41.236 2486-7131/? E/android.media.AudioRecord: Error code -20 when initializing native AudioRecord object.
2020-10-20 15:14:41.237 2486-7131/? E/ActivityThread: Failed to find provider info for
请注意，对于此迁移，我尚未对DAO进行任何更改。那里也需要任何更改吗？
有人可以帮我这个忙吗？任何帮助将不胜感激。谢谢
解决方法
要确保ModifyDate不为空，您需要进行以下更改：
private var ModifyDate =“” => private var ModifyDate：字符串=“”