无法在 Android 中更新 Sqlite 中的行，但不会引发任何错误
Cannot update row in Sqlite in Android but not throwing any error
我绝对是 Android 的初学者。现在我开始在我的教程项目中使用 SQLite 数据库。我尝试插入和选择数据。一切正常。但是现在我第一次开始更新行。但是行实际上没有在数据库中更新。但它没有抛出错误。
我的数据库助手class
public class DatabaseHelper extends SQLiteOpenHelper {
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "todo.db";
private static final String TABLE_NAME = "task";
private static final String COLUMN_ID = "id";
private static final String COLUMN_DESCRIPTION = "description";
private static final String COLUMN_DATE ="date";
private static final String COLUMN_DONE = "done";
private static final String CREATE_TABLE = "CREATE TABLE "+TABLE_NAME+" ("+COLUMN_ID+" INTEGER PRIMARY KEY AUTOINCREMENT,"+COLUMN_DESCRIPTION+" TEXT,"+
COLUMN_DATE+" DATE,"+COLUMN_DONE+" BOOLEAN)";
SQLiteDatabase db;
public DatabaseHelper(Context context)
{
super(context,DATABASE_NAME,null,DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db)
{
this.db = db;
db.execSQL(CREATE_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
String query = "DROP TABLE IF EXISTS "+TABLE_NAME;
db.execSQL(query);
this.onCreate(db);
}
public void insertTask(Task task)
{
db = getWritableDatabase();
ContentValues values = new ContentValues();
values.put(COLUMN_DESCRIPTION,task.getDescription());
values.put(COLUMN_DATE,task.getDate().toString());
values.put(COLUMN_DONE,Boolean.FALSE.toString());
db.insert(TABLE_NAME, null, values);
db.close();
}
public ArrayList<Task> getAllTasks()
{
ArrayList<Task> items = new ArrayList<Task>();
db = getReadableDatabase();
String query = "SELECT * FROM "+TABLE_NAME;
Cursor cursor = db.rawQuery(query,null);
if(cursor.moveToFirst())
{
do{
Task item = new Task();
String date = cursor.getString(2);
Date parsedDate = new Date();
SimpleDateFormat format = new SimpleDateFormat("MM/dd/yyyy");
try{
parsedDate = format.parse(date);
}
catch (ParseException e)
{
parsedDate = null;
}
item.setId(cursor.getInt(0));
item.setDescription(cursor.getString(1));
item.setDate(parsedDate);
item.setDone(Boolean.valueOf(cursor.getString(3)));
items.add(item);
}
while (cursor.moveToNext());
}
return items;
}
public void markAsDone(int id){
db = getWritableDatabase();
ContentValues updatedData = new ContentValues();
updatedData.put(COLUMN_DONE, Boolean.TRUE);
String where = COLUMN_ID+" = "+String.valueOf(id);
db.update(TABLE_NAME,updatedData,where,null);
}
}
这就是我在片段 class 中更新数据库的方式。我的片段class
public class TaskListFragment extends Fragment {
private DatabaseHelper dbHelper;
private TextView taskTitle;
private ListView taskListView;
private ArrayAdapter adapter;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
dbHelper = new DatabaseHelper(getActivity());
View view= inflater.inflate(R.layout.task_list, container, false);
taskTitle = (TextView)view.findViewById(R.id.task_textview);
taskListView = (ListView)view.findViewById(R.id.listViewTaskList);
int type = getArguments().getInt("type");
switch (type){
case R.integer.task_list_all:
ArrayList<Task> items = dbHelper.getAllTasks();
adapter = new TaskListAdapter(getActivity(),items);
taskListView.setAdapter(adapter);
taskTitle.setText("All tasks");
break;
}
taskListView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
int tagId = Integer.valueOf(view.getTag().toString());
showOptionDialog(tagId);
return true;
}
});
return view;
}
public void showOptionDialog(final int id)
{
LayoutInflater layoutInflater = LayoutInflater.from(getActivity());
View view = layoutInflater.inflate(R.layout.row_option_dialog, null);
final AlertDialog alertDialog = new AlertDialog.Builder(getActivity()).create();
Button doneBtn = (Button)view.findViewById(R.id.btn_row_option_done);
doneBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dbHelper.markAsDone(id);
Toast.makeText(getActivity().getBaseContext(),"Marked as done",Toast.LENGTH_SHORT).show();
//
// This is showing toast message "Mark as done".
// But data is not actually updated. Why is this?
//
}
});
Button editBtn = (Button)view.findViewById(R.id.btn_row_option_edit);
editBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
Button deleteBtn = (Button)view.findViewById(R.id.btn_row_option_delete);
deleteBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
Button cancelBtn = (Button)view.findViewById(R.id.btn_row_option_cancel);
cancelBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
alertDialog.setView(view);
alertDialog.show();
}
}
我正在使用片段中的 markAsDone 方法更新行。我的代码有什么问题？我不知道如何解决它，因为它没有抛出任何错误。
我在 logcat
才得到这个
01-25 10:09:00.177 128-336/? W/genymotion_audio: out_write() limiting sleep time 26780 to 23219
01-25 10:09:02.509 128-336/? W/genymotion_audio: out_write() limiting sleep time 31155 to 23219
01-25 10:09:04.337 2622-2622/? I/dalvikvm: Could not find method android.content.res.Resources.getDrawable, referenced from method android.support.v7.widget.ResourcesWrapper.getDrawable
01-25 10:09:04.337 2622-2622/? W/dalvikvm: VFY: unable to resolve virtual method 399: Landroid/content/res/Resources;.getDrawable (ILandroid/content/res/Resources$Theme;)Landroid/graphics/drawable/Drawable;
01-25 10:09:04.341 2622-2622/? D/dalvikvm: VFY: replacing opcode 0x6e at 0x0002
01-25 10:09:04.341 2622-2622/? I/dalvikvm: Could not find method android.content.res.Resources.getDrawableForDensity, referenced from method android.support.v7.widget.ResourcesWrapper.getDrawableForDensity
01-25 10:09:04.341 2622-2622/? W/dalvikvm: VFY: unable to resolve virtual method 401: Landroid/content/res/Resources;.getDrawableForDensity (IILandroid/content/res/Resources$Theme;)Landroid/graphics/drawable/Drawable;
01-25 10:09:04.341 2622-2622/? D/dalvikvm: VFY: replacing opcode 0x6e at 0x0002
01-25 10:09:04.349 2622-2626/? D/dalvikvm: GC_CONCURRENT freed 1457K, 20% free 6388K/7980K, paused 1ms+1ms, total 7ms
01-25 10:09:08.705 128-336/? W/genymotion_audio: out_write() limiting sleep time 30339 to 23219
01-25 10:09:14.709 2622-2622/? W/EGL_genymotion: eglSurfaceAttrib not implemented
01-25 10:09:19.653 407-991/? W/InputMethodManagerService: Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@533e36b4 attribute=null, token = android.os.BinderProxy@53391868
01-25 10:09:21.509 2622-2622/? W/EGL_genymotion: eglSurfaceAttrib not implemented
01-25 10:09:22.957 128-336/? W/genymotion_audio: out_write() limiting sleep time 61269 to 23219
01-25 10:09:22.977 128-336/? W/genymotion_audio: out_write() limiting sleep time 52879 to 23219
01-25 10:09:23.005 128-336/? W/genymotion_audio: out_write() limiting sleep time 44489 to 23219
01-25 10:09:23.029 128-336/? W/genymotion_audio: out_write() limiting sleep time 36099 to 23219
当我记录 return 更新语句的值时，它是 returning 1.
您在 sqlite 中没有布尔数据类型，请改用整数。
public void markAsDone(int id){
db = getWritableDatabase();
ContentValues updatedData = new ContentValues();
updatedData.put(COLUMN_DONE, 1);
String where = COLUMN_ID + "=?"
db.update(TABLE_NAME,updatedData,where,new String[]{String.valueOf(id)});
}
我得到了答案。现在我在 DatabaseHelper 的 markAsDone 方法中像这样更新数据库中行的布尔值。
updatedData.put(COLUMN_DONE, Boolean.TRUE);
那我就改成了
updatedData.put(COLUMN_DONE, String.valueOf(Boolean.TRUE));
我需要将布尔值解析为字符串。
1). 检查你的 Logcat 你没有任何错误。
2). 启用日志记录以查看所有 SQL 语句，你在做什么：
https://gist.github.com/davetrux/9741432
adb shell setprop log.tag.SQLiteLog V
adb shell setprop log.tag.SQLiteStatements V
adb shell stop
adb shell start
或者读这个：
或者这样：
无论如何，您需要检查您的 SQL 查询是否正确。
3). 如果你的查询很好，但是你仍然不能更新你的行，你需要这样做：
3.1) 前往<android-sdk-dir>/platform-tools
3.2).确保您当前的版本是 Debug（不是 Release，否则您将收到消息 adbd cannot run as root in production builds）。
我的意思是你应该运行你的应用程序通过这个按钮：
和运行下一个命令：
./adb root
./adb shell
run-as com.mycompany.app //<----------- your applicationId from build.gradle
ls -l
drwxrwx--x u0_a88 u0_a88 2016-01-25 15:44 cache
drwx------ u0_a88 u0_a88 2016-01-25 15:25 code_cache
drwxrwx--x u0_a88 u0_a88 2016-01-25 15:44 databases //<----
drwxrwx--x u0_a88 u0_a88 2016-01-25 15:26 files
cd databases/
ls -l
-rw-rw---- u0_a88 u0_a88 172032 2016-01-25 15:45 <your-app>.db
-rw------- u0_a88 u0_a88 33344 2016-01-25 15:45 <your-app>.db-journal
chmod 777 -R <your-app>.db
exit
exit
./adb pull /data/data/<your applicationId from build.gradle>/databases/<your-app>.db ~/projects/
在此之后，您将在 ~/projects/
目录中获得 SQLite 数据库的副本。
打开它，例如：http://sqlitebrowser.org/
尝试执行更新查询，您可以从Logcat.
获取
您将看到所有 SQL 个错误，并且您将能够非常快速地修复它。
祝你好运！
我绝对是 Android 的初学者。现在我开始在我的教程项目中使用 SQLite 数据库。我尝试插入和选择数据。一切正常。但是现在我第一次开始更新行。但是行实际上没有在数据库中更新。但它没有抛出错误。
我的数据库助手class
public class DatabaseHelper extends SQLiteOpenHelper {
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "todo.db";
private static final String TABLE_NAME = "task";
private static final String COLUMN_ID = "id";
private static final String COLUMN_DESCRIPTION = "description";
private static final String COLUMN_DATE ="date";
private static final String COLUMN_DONE = "done";
private static final String CREATE_TABLE = "CREATE TABLE "+TABLE_NAME+" ("+COLUMN_ID+" INTEGER PRIMARY KEY AUTOINCREMENT,"+COLUMN_DESCRIPTION+" TEXT,"+
COLUMN_DATE+" DATE,"+COLUMN_DONE+" BOOLEAN)";
SQLiteDatabase db;
public DatabaseHelper(Context context)
{
super(context,DATABASE_NAME,null,DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db)
{
this.db = db;
db.execSQL(CREATE_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
String query = "DROP TABLE IF EXISTS "+TABLE_NAME;
db.execSQL(query);
this.onCreate(db);
}
public void insertTask(Task task)
{
db = getWritableDatabase();
ContentValues values = new ContentValues();
values.put(COLUMN_DESCRIPTION,task.getDescription());
values.put(COLUMN_DATE,task.getDate().toString());
values.put(COLUMN_DONE,Boolean.FALSE.toString());
db.insert(TABLE_NAME, null, values);
db.close();
}
public ArrayList<Task> getAllTasks()
{
ArrayList<Task> items = new ArrayList<Task>();
db = getReadableDatabase();
String query = "SELECT * FROM "+TABLE_NAME;
Cursor cursor = db.rawQuery(query,null);
if(cursor.moveToFirst())
{
do{
Task item = new Task();
String date = cursor.getString(2);
Date parsedDate = new Date();
SimpleDateFormat format = new SimpleDateFormat("MM/dd/yyyy");
try{
parsedDate = format.parse(date);
}
catch (ParseException e)
{
parsedDate = null;
}
item.setId(cursor.getInt(0));
item.setDescription(cursor.getString(1));
item.setDate(parsedDate);
item.setDone(Boolean.valueOf(cursor.getString(3)));
items.add(item);
}
while (cursor.moveToNext());
}
return items;
}
public void markAsDone(int id){
db = getWritableDatabase();
ContentValues updatedData = new ContentValues();
updatedData.put(COLUMN_DONE, Boolean.TRUE);
String where = COLUMN_ID+" = "+String.valueOf(id);
db.update(TABLE_NAME,updatedData,where,null);
}
}
这就是我在片段 class 中更新数据库的方式。我的片段class
public class TaskListFragment extends Fragment {
private DatabaseHelper dbHelper;
private TextView taskTitle;
private ListView taskListView;
private ArrayAdapter adapter;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
dbHelper = new DatabaseHelper(getActivity());
View view= inflater.inflate(R.layout.task_list, container, false);
taskTitle = (TextView)view.findViewById(R.id.task_textview);
taskListView = (ListView)view.findViewById(R.id.listViewTaskList);
int type = getArguments().getInt("type");
switch (type){
case R.integer.task_list_all:
ArrayList<Task> items = dbHelper.getAllTasks();
adapter = new TaskListAdapter(getActivity(),items);
taskListView.setAdapter(adapter);
taskTitle.setText("All tasks");
break;
}
taskListView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
int tagId = Integer.valueOf(view.getTag().toString());
showOptionDialog(tagId);
return true;
}
});
return view;
}
public void showOptionDialog(final int id)
{
LayoutInflater layoutInflater = LayoutInflater.from(getActivity());
View view = layoutInflater.inflate(R.layout.row_option_dialog, null);
final AlertDialog alertDialog = new AlertDialog.Builder(getActivity()).create();
Button doneBtn = (Button)view.findViewById(R.id.btn_row_option_done);
doneBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
dbHelper.markAsDone(id);
Toast.makeText(getActivity().getBaseContext(),"Marked as done",Toast.LENGTH_SHORT).show();
//
// This is showing toast message "Mark as done".
// But data is not actually updated. Why is this?
//
}
});
Button editBtn = (Button)view.findViewById(R.id.btn_row_option_edit);
editBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
Button deleteBtn = (Button)view.findViewById(R.id.btn_row_option_delete);
deleteBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
Button cancelBtn = (Button)view.findViewById(R.id.btn_row_option_cancel);
cancelBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
alertDialog.setView(view);
alertDialog.show();
}
}
我正在使用片段中的 markAsDone 方法更新行。我的代码有什么问题？我不知道如何解决它，因为它没有抛出任何错误。
我在 logcat
才得到这个01-25 10:09:00.177 128-336/? W/genymotion_audio: out_write() limiting sleep time 26780 to 23219
01-25 10:09:02.509 128-336/? W/genymotion_audio: out_write() limiting sleep time 31155 to 23219
01-25 10:09:04.337 2622-2622/? I/dalvikvm: Could not find method android.content.res.Resources.getDrawable, referenced from method android.support.v7.widget.ResourcesWrapper.getDrawable
01-25 10:09:04.337 2622-2622/? W/dalvikvm: VFY: unable to resolve virtual method 399: Landroid/content/res/Resources;.getDrawable (ILandroid/content/res/Resources$Theme;)Landroid/graphics/drawable/Drawable;
01-25 10:09:04.341 2622-2622/? D/dalvikvm: VFY: replacing opcode 0x6e at 0x0002
01-25 10:09:04.341 2622-2622/? I/dalvikvm: Could not find method android.content.res.Resources.getDrawableForDensity, referenced from method android.support.v7.widget.ResourcesWrapper.getDrawableForDensity
01-25 10:09:04.341 2622-2622/? W/dalvikvm: VFY: unable to resolve virtual method 401: Landroid/content/res/Resources;.getDrawableForDensity (IILandroid/content/res/Resources$Theme;)Landroid/graphics/drawable/Drawable;
01-25 10:09:04.341 2622-2622/? D/dalvikvm: VFY: replacing opcode 0x6e at 0x0002
01-25 10:09:04.349 2622-2626/? D/dalvikvm: GC_CONCURRENT freed 1457K, 20% free 6388K/7980K, paused 1ms+1ms, total 7ms
01-25 10:09:08.705 128-336/? W/genymotion_audio: out_write() limiting sleep time 30339 to 23219
01-25 10:09:14.709 2622-2622/? W/EGL_genymotion: eglSurfaceAttrib not implemented
01-25 10:09:19.653 407-991/? W/InputMethodManagerService: Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@533e36b4 attribute=null, token = android.os.BinderProxy@53391868
01-25 10:09:21.509 2622-2622/? W/EGL_genymotion: eglSurfaceAttrib not implemented
01-25 10:09:22.957 128-336/? W/genymotion_audio: out_write() limiting sleep time 61269 to 23219
01-25 10:09:22.977 128-336/? W/genymotion_audio: out_write() limiting sleep time 52879 to 23219
01-25 10:09:23.005 128-336/? W/genymotion_audio: out_write() limiting sleep time 44489 to 23219
01-25 10:09:23.029 128-336/? W/genymotion_audio: out_write() limiting sleep time 36099 to 23219
当我记录 return 更新语句的值时，它是 returning 1.
您在 sqlite 中没有布尔数据类型，请改用整数。
public void markAsDone(int id){
db = getWritableDatabase();
ContentValues updatedData = new ContentValues();
updatedData.put(COLUMN_DONE, 1);
String where = COLUMN_ID + "=?"
db.update(TABLE_NAME,updatedData,where,new String[]{String.valueOf(id)});
}
我得到了答案。现在我在 DatabaseHelper 的 markAsDone 方法中像这样更新数据库中行的布尔值。
updatedData.put(COLUMN_DONE, Boolean.TRUE);
那我就改成了
updatedData.put(COLUMN_DONE, String.valueOf(Boolean.TRUE));
我需要将布尔值解析为字符串。
1). 检查你的 Logcat 你没有任何错误。
2). 启用日志记录以查看所有 SQL 语句，你在做什么：
https://gist.github.com/davetrux/9741432
adb shell setprop log.tag.SQLiteLog V
adb shell setprop log.tag.SQLiteStatements V
adb shell stop
adb shell start
或者读这个：
或者这样：
无论如何，您需要检查您的 SQL 查询是否正确。
3). 如果你的查询很好，但是你仍然不能更新你的行，你需要这样做：
3.1) 前往<android-sdk-dir>/platform-tools
3.2).确保您当前的版本是 Debug（不是 Release，否则您将收到消息 adbd cannot run as root in production builds）。
我的意思是你应该运行你的应用程序通过这个按钮：
和运行下一个命令：
./adb root
./adb shell
run-as com.mycompany.app //<----------- your applicationId from build.gradle
ls -l
drwxrwx--x u0_a88 u0_a88 2016-01-25 15:44 cache
drwx------ u0_a88 u0_a88 2016-01-25 15:25 code_cache
drwxrwx--x u0_a88 u0_a88 2016-01-25 15:44 databases //<----
drwxrwx--x u0_a88 u0_a88 2016-01-25 15:26 files
cd databases/
ls -l
-rw-rw---- u0_a88 u0_a88 172032 2016-01-25 15:45 <your-app>.db
-rw------- u0_a88 u0_a88 33344 2016-01-25 15:45 <your-app>.db-journal
chmod 777 -R <your-app>.db
exit
exit
./adb pull /data/data/<your applicationId from build.gradle>/databases/<your-app>.db ~/projects/
在此之后，您将在 ~/projects/
目录中获得 SQLite 数据库的副本。
打开它，例如：http://sqlitebrowser.org/
尝试执行更新查询，您可以从Logcat.
获取
您将看到所有 SQL 个错误，并且您将能够非常快速地修复它。
祝你好运！