当我在创建数据库时打开我的活动时，它立即崩溃并出现错误SQLiteException：没有这样的列。我很难做什么，因为SQLite对我来说仍然是一个谜。
* 新错误，这次我可以创建锻炼记录，但是一旦我点击编辑它，我得到另一个没有这样的列存在，这次是squatLabel。但确实存在...... *
编辑：我在这一点上唯一的错误是没有这样的列存在：squatLabel
import android.app.ListActivity;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.view.ContextMenu;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ContextMenu.ContextMenuInfo;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.widget.AdapterView.AdapterContextMenuInfo;
public class WorkoutList extends ListActivity {
private static final int ACTIVITY_CREATE=0;
private static final int ACTIVITY_EDIT=1;
private static final int INSERT_ID = Menu.FIRST;
private static final int DELETE_ID = Menu.FIRST + 1;
private StrongDbAdapter mDbHelper;
/** Called when the 5x5 button is pressed in first activity */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.workout_list);
mDbHelper = new StrongDbAdapter(this);
mDbHelper.open();
fillData();
registerForContextMenu(getListView());
}
private void fillData() {
Cursor NotesCursor = mDbHelper.fetchAllNotes();
// Get all of the rows from the database and create the item list
NotesCursor = mDbHelper.fetchAllNotes();
startManagingCursor(NotesCursor);
// Create an array to specify the fields we want to display in the list (only TITLE)
String[] from = new String[]{StrongDbAdapter.KEY_TITLE,};
// and an array of the fields we want to bind those fields to (in this case just text1)
int[] to = new int[]{R.id.workout_row };
// Now create a simple cursor adapter and set it to display
SimpleCursorAdapter notes =
new SimpleCursorAdapter(this, R.layout.workout_row, NotesCursor, from, to);
setListAdapter(notes);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
menu.add(0, INSERT_ID, 0, R.string.menu_insert);
return true;
}
@Override
public boolean onMenuItemSelected(int featureId, MenuItem item) {
switch(item.getItemId()) {
case INSERT_ID:
createNote();
return true;
}
return super.onMenuItemSelected(featureId, item);
}
@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
menu.add(0, DELETE_ID, 0, R.string.menu_delete);
}
@Override
public boolean onContextItemSelected(MenuItem item) {
switch(item.getItemId()) {
case DELETE_ID:
AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
mDbHelper.deleteNote(info.id);
fillData();
return true;
}
return super.onContextItemSelected(item);
}
private void createNote() {
Intent i = new Intent(this, WorkoutEdit.class);
startActivityForResult(i, ACTIVITY_CREATE);
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
Intent i = new Intent(this, WorkoutEdit.class);
i.putExtra(StrongDbAdapter.KEY_ROWID, id);
startActivityForResult(i, ACTIVITY_EDIT);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
fillData();
}
}
以下是我的WorkoutEdit课程，其中似乎发生了一些问题。
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.database.Cursor;
import android.os.Bundle;
import android.text.InputType;
import android.view.View;
import android.view.WindowManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.TextView;
import android.widget.ViewFlipper;
public class WorkoutEdit extends Activity {
public TextView mTitleText;
//private EditText mBodyText;
private Long mRowId;
private StrongDbAdapter mDbHelper;
private ViewFlipper viewFlipper;
public TextView squats;
public boolean workoutA;
public String workoutState;
//private double rowId = mRowId;
public String squatLabel;
public Button confirmButton;
private Long prevId ;
private void populateFields() {
if (mRowId != null) {
Cursor note = mDbHelper.fetchNote(mRowId);
startManagingCursor(note);
//mTitleText.setText(note.getString(
//note.getColumnIndexOrThrow(StrongDbAdapter.KEY_TITLE)));
workoutState=(note.getString(
note.getColumnIndexOrThrow(StrongDbAdapter.KEY_TITLE)));
squats.setText(note.getString(note.getColumnIndexOrThrow(StrongDbAdapter.SQUAT_LABEL)));
}
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
saveState();
outState.putSerializable(StrongDbAdapter.KEY_ROWID, mRowId);
}
@Override
protected void onPause() {
super.onPause();
saveState();
}
@Override
protected void onResume() {
super.onResume();
populateFields();
}
//Saves all the data to the database
private void saveState() {
String title = workoutState;
String squatLabel = squats.getText().toString();
if (mRowId == null) {
long id = mDbHelper.createNote(title, squatLabel);
if (id > 0) {
mRowId = id;
}
} else {
mDbHelper.updateNote(mRowId, title);
}
}
}
@Override
protected void onDestroy() {
super.onDestroy();
if (mDbHelper != null) {
mDbHelper.close();
}
}
}
这是我的DbAdapter
* 更新了创建声明 *
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class StrongDbAdapter {
public static final String KEY_TITLE = "title";
public static final String KEY_BODY = "body";
public static final String KEY_ROWID = "_id";
public static final String WORKOUT_STATE = "workoutState";
public static final String SQUAT_LABEL = "squatLabel";
private static final String TAG = "StrongDbAdapter";
private DatabaseHelper mDbHelper;
private SQLiteDatabase mDb;
private static final String DATABASE_NAME = "data";
private static final String DATABASE_TABLE = "notes";
private static final int DATABASE_VERSION = 2;
/**
* Database creation sql statement
*/
private static final String DATABASE_CREATE =
"create table notes (_id integer primary key autoincrement , "
+ "title text," +
" squatLabel text, workoutState text );";
private final Context mCtx;
private static class DatabaseHelper extends SQLiteOpenHelper {
DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(DATABASE_CREATE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
Log.w(TAG, "Upgrading database from version " + oldVersion + " to "
+ newVersion + ", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS notes");
onCreate(db);
}
}
/**
* Constructor - takes the context to allow the database to be
* opened/created
*
* @param ctx the Context within which to work
*/
public StrongDbAdapter(Context ctx) {
this.mCtx = ctx;
}
/**
* Open the notes database. If it cannot be opened, try to create a new
* instance of the database. If it cannot be created, throw an exception to
* signal the failure
*
* @return this (self reference, allowing this to be chained in an
* initialization call)
* @throws SQLException if the database could be neither opened or created
*/
public StrongDbAdapter open() throws SQLException {
mDbHelper = new DatabaseHelper(mCtx);
mDb = mDbHelper.getWritableDatabase();
return this;
}
public void close() {
mDbHelper.close();
}
public long createNote(String title, String squatLabel) {
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_TITLE, title);
//initialValues.put(WORKOUT_STATE, workoutState);
initialValues.put(SQUAT_LABEL, squatLabel);
return mDb.insert(DATABASE_TABLE, null, initialValues);
}
/**
* Delete the note with the given rowId
*
* @param rowId id of note to delete
* @return true if deleted, false otherwise
*/
public boolean deleteNote(long rowId) {
return mDb.delete(DATABASE_TABLE, KEY_ROWID + "=" + rowId, null) > 0;
}
/**
* Return a Cursor over the list of all notes in the database
*
* @return Cursor over all notes
*/
public Cursor fetchAllNotes() {
return mDb.query(DATABASE_TABLE, new String[] {KEY_ROWID, KEY_TITLE,
WORKOUT_STATE}, null, null, null, null, null);
}
/**
* Return a Cursor positioned at the note that matches the given rowId
*
* @param rowId id of note to retrieve
* @return Cursor positioned to matching note, if found
* @throws SQLException if note could not be found/retrieved
*/
public Cursor fetchNote(long rowId) throws SQLException {
Cursor mCursor =
mDb.query(true, DATABASE_TABLE, new String[] {KEY_ROWID,
KEY_TITLE, WORKOUT_STATE}, KEY_ROWID + "='" + rowId+"'", null,
null, null, null, null);
if (mCursor != null) {
mCursor.moveToFirst();
}
return mCursor;
}
/**
* Update the note using the details provided. The note to be updated is
* specified using the rowId, and it is altered to use the title and body
* values passed in
* @return true if the note was successfully updated, false otherwise
*/
public boolean updateNote(long rowId, String title) {
ContentValues args = new ContentValues();
args.put(KEY_TITLE, title);
//args.put(WORKOUT_STATE, workoutState);
return mDb.update(DATABASE_TABLE, args, KEY_ROWID + "=" + rowId, null) > 0;
}
}
最后我的LogCat：
* 使用新的create语句，这次没有这样的列squatLabel。 *
08-05 18:57:05.336: E/AndroidRuntime(1131): FATAL EXCEPTION: main
08-05 18:57:05.336: E/AndroidRuntime(1131): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.anapoleon.android.stronglifts/com.anapoleon.android.stronglifts.WorkoutEdit}: java.lang.IllegalArgumentException: column 'squatLabel' does not exist
08-05 18:57:05.336: E/AndroidRuntime(1131): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1955)
08-05 18:57:05.336: E/AndroidRuntime(1131): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980)
08-05 18:57:05.336: E/AndroidRuntime(1131): at android.app.ActivityThread.access$600(ActivityThread.java:122)
08-05 18:57:05.336: E/AndroidRuntime(1131): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146)
08-05 18:57:05.336: E/AndroidRuntime(1131): at android.os.Handler.dispatchMessage(Handler.java:99)
08-05 18:57:05.336: E/AndroidRuntime(1131): at android.os.Looper.loop(Looper.java:137)
08-05 18:57:05.336: E/AndroidRuntime(1131): at android.app.ActivityThread.main(ActivityThread.java:4340)
08-05 18:57:05.336: E/AndroidRuntime(1131): at java.lang.reflect.Method.invokeNative(Native Method)
08-05 18:57:05.336: E/AndroidRuntime(1131): at java.lang.reflect.Method.invoke(Method.java:511)
08-05 18:57:05.336: E/AndroidRuntime(1131): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
08-05 18:57:05.336: E/AndroidRuntime(1131): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
08-05 18:57:05.336: E/AndroidRuntime(1131): at dalvik.system.NativeStart.main(Native Method)
08-05 18:57:05.336: E/AndroidRuntime(1131): Caused by: java.lang.IllegalArgumentException: column 'squatLabel' does not exist
08-05 18:57:05.336: E/AndroidRuntime(1131): at android.database.AbstractCursor.getColumnIndexOrThrow(AbstractCursor.java:301)
08-05 18:57:05.336: E/AndroidRuntime(1131): at com.anapoleon.android.stronglifts.WorkoutEdit.populateFields(WorkoutEdit.java:199)
08-05 18:57:05.336: E/AndroidRuntime(1131): at com.anapoleon.android.stronglifts.WorkoutEdit.onCreate(WorkoutEdit.java:82)
08-05 18:57:05.336: E/AndroidRuntime(1131): at android.app.Activity.performCreate(Activity.java:4465)
08-05 18:57:05.336: E/AndroidRuntime(1131): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
08-05 18:57:05.336: E/AndroidRuntime(1131): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1919)
08-05 18:57:05.336: E/AndroidRuntime(1131): ... 11 more
提前致谢！ ：）
答案 0 :(得分：1)
正如其他人所说，您没有在数据库中定义该列。
他们忽略了告诉你的是，你必须在之后执行以下两项操作中的一项将列添加到应用程序中的数据库架构。
1）删除并重新安装您的应用，以便在创建数据库时使用DB的新架构
或
2）增加数据库的版本，以便调用onUpgrade方法并将数据库更新为新模式
答案 1 :(得分：0)
查看你的创建声明：
private static final String DATABASE_CREATE =
"create table notes (_id integer primary key autoincrement , "
+ "title text," +
" squatLabel text );";
您没有包含workoutState。只需将列添加到create语句中即可。
答案 2 :(得分：0)
它会更新您更新的Create DB语句。
关于下一个错误：它接缝你永远不会关闭你的数据库和光标。 我在处理DB时通常使用下一个模板：
openReadableDatabase(); // or openWritableDatabase();
// do some work with DB
closeDatabase();
上述方法可能如下所示：
private void closeDatabase() {
if (_db != null && _db.isOpen()) {
_db.close();
}
}
private void openReadableDatabase() {
_db = getReadableDatabase();
}
private void openWritableDatabase() {
_db = getWritableDatabase();
}
相同您可以应用于光标对象：
Cursor cursor = _db.query(TABLE_NAME, FROM, null, null, null, null, null);
// do some work with cursor
cursor.close();
FROM是一个列名称数组。注意：最后一个列名后面的逗号不是拼写错误。
private static final String[] FROM = { COLUMN1_NAME, COLUMN2_NAME, };
更新
您应该将SquatLabel列添加到db.query（）方法中的数据检索参数（对于fetchNote方法也是如此）：
public Cursor fetchAllNotes() {
return mDb.query(DATABASE_TABLE, new String[] {KEY_ROWID, KEY_TITLE,
SQUAT_LABEL, WORKOUT_STATE}, null, null, null, null, null);
}