Kotlin：刚从 roomdatabase 取回第一个参数
Kotlin : Just got back the first parameter from roomdatabase
我的代码有问题，我无法解决。
让我简单介绍一下我要做什么：我在 ChooseFragment 中有一个地址，并且有一个用于编辑地址的编辑按钮。好的，到目前为止很好。编辑点击将新地址传递给 DatabaseRoom 并且地址文本将被更改。但这是第一次发生。第二次地址没有改变！ .我知道插入方法有效并将新数据发送到数据库室但是当我想通过查询获取它时 (SELECT * FROM ...) 只显示第一个参数而不用新值替换。我的代码有什么问题？
这是我的 table :
@Entity (tableName = "addresstable")
data class AddressTb(
@PrimaryKey(autoGenerate = true)```
val id : Int? ,
var address: String)```
这是我的数据库：
@Database(entities = [RoomTables::class , AddressTb::class], version = 1, exportSchema = false)
abstract class DataBaseRoom : RoomDatabase() {
abstract fun GetDao(): DaoCart
companion object {
@Volatile
private var instance: DataBaseRoom? = null
private val lock = Any()
operator fun invoke(context: Context) = instance
?: synchronized(lock) {
instance
?: makeDatabase(
context
).also {
instance = it
}
}
private fun makeDatabase(context: Context) = Room.databaseBuilder(
context.applicationContext,
DataBaseRoom::class.java,
"name"
).build()
}
}```
this is my Dao :
```//address table dao
@Query("SELECT * FROM addresstable")
fun getalladress () : LiveData<AddressTb>
@Insert(onConflict = OnConflictStrategy.REPLACE)
suspend fun insertaddress (model : AddressTb)
@Query("DELETE FROM addresstable")
suspend fun deleteaddress ()
这是我的存储库：
fun getalladdress() = db.GetDao().getalladress()
suspend fun deleteaddress() = db.GetDao().deleteaddress()
suspend fun insertaddress(model : AddressTb) = db.GetDao().insertaddress(model)
这是我的视图模型：
fun getaddress() = repository.getalladdress()
fun deleteaddres() = CoroutineScope(Dispatchers.Default).launch {
repository.deleteaddress()
}
fun insertaddress(model : AddressTb) = CoroutineScope(Dispatchers.Default).launch {
repository.insertaddress(model)
这是我获取新插入内容的片段：
class ChosseAddress : Fragment() {
lateinit var viewModelRoom: ViewModelRoom
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
val vl = inflater.inflate(R.layout.choose_address_layout, container, false)
val database = DataBaseRoom(requireContext())
val repository = RepositoryCart(database)
val factoryRoom = FactoryRoom(repository)
viewModelRoom =
ViewModelProvider(ViewModelStoreOwner { ViewModelStore() }, factoryRoom).get(
ViewModelRoom::class.java
)
viewModelRoom.getaddress().observe(viewLifecycleOwner, Observer {
try {
vl.txt_address.text = it.address
} catch (ex: Exception) {
null
}
})
val animsec: Animation =
AnimationUtils.loadAnimation(vl.context, R.anim.anim_for_btn_zoom_out)
vl.button_back_choose_address.setOnClickListener {
it.startAnimation(animsec)
childFragmentManager.beginTransaction()
.replace(R.id.choose_address_container, HamburgerFragment())
.commit()
}
vl.edit_address.setOnClickListener {
val mycustomview =
LayoutInflater.from(context).inflate(R.layout.alertfialog_costume, null)
val dialogtext = LayoutInflater.from(context).inflate(R.layout.edit_alert_txt, null)
val mBuilder = AlertDialog.Builder(context)
.setView(mycustomview)
.setCustomTitle(dialogtext)
val show = mBuilder.show()
mycustomview.edit_manually.setOnClickListener {
show.dismiss()
childFragmentManager.beginTransaction()
.replace(R.id.choose_address_container, ManuallyAddressFragment())
.commit()
}
}
return vl
}
}```
这是我向数据库插入数据的地方：
class ManuallyAddressFragment : Fragment() {
lateinit var viewmodel: ViewModelRoom
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
val layoutview = inflater.inflate(R.layout.manually_address_fragment, container, false)
val database = DataBaseRoom(layoutview.context)
val repos = RepositoryCart(database)
val factory = FactoryRoom(repos)
viewmodel = ViewModelProvider(ViewModelStoreOwner { viewModelStore },
factory).get(ViewModelRoom::class.java)
val btncancle: Button = layoutview.btn_cancle
val btnsubmit: Button = layoutview.btn_submit_address
btnsubmit.setOnClickListener {
val edittext = layoutview.edit_address_manually
if (edittext.text.toString().isEmpty()) {
Toast.makeText(context, R.string.submit_btn, Toast.LENGTH_SHORT).show()
} else {
val insert = (AddressTb( null , edittext.text.toString()))
viewmodel.insertaddress(insert)
childFragmentManager.beginTransaction()
.setCustomAnimations(
R.anim.anim_fragment_manually,
R.anim.anim_fragment_chooseaddress
)
.replace(R.id.manually_container, ChosseAddress())
.commit()
Toast.makeText(context, "آدرس شما با موفقیت ثبت شد", Toast.LENGTH_SHORT).show()
}
}
btncancle.setOnClickListener {
childFragmentManager.beginTransaction()
.setCustomAnimations(
R.anim.anim_fragment_manually,
R.anim.anim_fragment_chooseaddress
)
.replace(R.id.manually_container, ChosseAddress())
.commit()
}
return layoutview
}
}```
我试过所以事情也使用更新方法，但数据库只返回第一个参数，我想要新的插入值...
首先，如果您要获取所有地址，它应该如下所示：
@Query("SELECT * FROM addresstable")
fun getalladress () : LiveData<List<AddressTb>>
要select一个地址，使用类似这样的东西：
@Query("SELECT * FROM addresstable WHERE id= :id")
fun findAddressById(id: Long) : AddressTb
要更新值，请使用与您的代码相同的 ID，我看到您尝试插入新对象 AddressTb(null , edittext.text.toString()) 您是为 id 传递 null 值，从您希望更新的 AddressTb 对象传递相同的 id，您从 getalladdress.
我的代码有问题，我无法解决。 让我简单介绍一下我要做什么：我在 ChooseFragment 中有一个地址，并且有一个用于编辑地址的编辑按钮。好的，到目前为止很好。编辑点击将新地址传递给 DatabaseRoom 并且地址文本将被更改。但这是第一次发生。第二次地址没有改变！ .我知道插入方法有效并将新数据发送到数据库室但是当我想通过查询获取它时 (SELECT * FROM ...) 只显示第一个参数而不用新值替换。我的代码有什么问题？
这是我的 table :
@Entity (tableName = "addresstable")
data class AddressTb(
@PrimaryKey(autoGenerate = true)```
val id : Int? ,
var address: String)```
这是我的数据库：
@Database(entities = [RoomTables::class , AddressTb::class], version = 1, exportSchema = false)
abstract class DataBaseRoom : RoomDatabase() {
abstract fun GetDao(): DaoCart
companion object {
@Volatile
private var instance: DataBaseRoom? = null
private val lock = Any()
operator fun invoke(context: Context) = instance
?: synchronized(lock) {
instance
?: makeDatabase(
context
).also {
instance = it
}
}
private fun makeDatabase(context: Context) = Room.databaseBuilder(
context.applicationContext,
DataBaseRoom::class.java,
"name"
).build()
}
}```
this is my Dao :
```//address table dao
@Query("SELECT * FROM addresstable")
fun getalladress () : LiveData<AddressTb>
@Insert(onConflict = OnConflictStrategy.REPLACE)
suspend fun insertaddress (model : AddressTb)
@Query("DELETE FROM addresstable")
suspend fun deleteaddress ()
这是我的存储库：
fun getalladdress() = db.GetDao().getalladress()
suspend fun deleteaddress() = db.GetDao().deleteaddress()
suspend fun insertaddress(model : AddressTb) = db.GetDao().insertaddress(model)
这是我的视图模型：
fun getaddress() = repository.getalladdress()
fun deleteaddres() = CoroutineScope(Dispatchers.Default).launch {
repository.deleteaddress()
}
fun insertaddress(model : AddressTb) = CoroutineScope(Dispatchers.Default).launch {
repository.insertaddress(model)
这是我获取新插入内容的片段：
class ChosseAddress : Fragment() {
lateinit var viewModelRoom: ViewModelRoom
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
val vl = inflater.inflate(R.layout.choose_address_layout, container, false)
val database = DataBaseRoom(requireContext())
val repository = RepositoryCart(database)
val factoryRoom = FactoryRoom(repository)
viewModelRoom =
ViewModelProvider(ViewModelStoreOwner { ViewModelStore() }, factoryRoom).get(
ViewModelRoom::class.java
)
viewModelRoom.getaddress().observe(viewLifecycleOwner, Observer {
try {
vl.txt_address.text = it.address
} catch (ex: Exception) {
null
}
})
val animsec: Animation =
AnimationUtils.loadAnimation(vl.context, R.anim.anim_for_btn_zoom_out)
vl.button_back_choose_address.setOnClickListener {
it.startAnimation(animsec)
childFragmentManager.beginTransaction()
.replace(R.id.choose_address_container, HamburgerFragment())
.commit()
}
vl.edit_address.setOnClickListener {
val mycustomview =
LayoutInflater.from(context).inflate(R.layout.alertfialog_costume, null)
val dialogtext = LayoutInflater.from(context).inflate(R.layout.edit_alert_txt, null)
val mBuilder = AlertDialog.Builder(context)
.setView(mycustomview)
.setCustomTitle(dialogtext)
val show = mBuilder.show()
mycustomview.edit_manually.setOnClickListener {
show.dismiss()
childFragmentManager.beginTransaction()
.replace(R.id.choose_address_container, ManuallyAddressFragment())
.commit()
}
}
return vl
}
}```
这是我向数据库插入数据的地方：
class ManuallyAddressFragment : Fragment() {
lateinit var viewmodel: ViewModelRoom
override fun onCreateView(
inflater: LayoutInflater,
container: ViewGroup?,
savedInstanceState: Bundle?
): View? {
val layoutview = inflater.inflate(R.layout.manually_address_fragment, container, false)
val database = DataBaseRoom(layoutview.context)
val repos = RepositoryCart(database)
val factory = FactoryRoom(repos)
viewmodel = ViewModelProvider(ViewModelStoreOwner { viewModelStore },
factory).get(ViewModelRoom::class.java)
val btncancle: Button = layoutview.btn_cancle
val btnsubmit: Button = layoutview.btn_submit_address
btnsubmit.setOnClickListener {
val edittext = layoutview.edit_address_manually
if (edittext.text.toString().isEmpty()) {
Toast.makeText(context, R.string.submit_btn, Toast.LENGTH_SHORT).show()
} else {
val insert = (AddressTb( null , edittext.text.toString()))
viewmodel.insertaddress(insert)
childFragmentManager.beginTransaction()
.setCustomAnimations(
R.anim.anim_fragment_manually,
R.anim.anim_fragment_chooseaddress
)
.replace(R.id.manually_container, ChosseAddress())
.commit()
Toast.makeText(context, "آدرس شما با موفقیت ثبت شد", Toast.LENGTH_SHORT).show()
}
}
btncancle.setOnClickListener {
childFragmentManager.beginTransaction()
.setCustomAnimations(
R.anim.anim_fragment_manually,
R.anim.anim_fragment_chooseaddress
)
.replace(R.id.manually_container, ChosseAddress())
.commit()
}
return layoutview
}
}```
我试过所以事情也使用更新方法，但数据库只返回第一个参数，我想要新的插入值...
首先，如果您要获取所有地址，它应该如下所示：
@Query("SELECT * FROM addresstable")
fun getalladress () : LiveData<List<AddressTb>>
要select一个地址，使用类似这样的东西：
@Query("SELECT * FROM addresstable WHERE id= :id")
fun findAddressById(id: Long) : AddressTb
要更新值，请使用与您的代码相同的 ID，我看到您尝试插入新对象 AddressTb(null , edittext.text.toString()) 您是为 id 传递 null 值，从您希望更新的 AddressTb 对象传递相同的 id，您从 getalladdress.