Hai problemi a ottenere sqlite lavorando nella mia applicazione Android
https://stackoverflow.com//questions/20010029
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20-12-2019 - |
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Sto avendo un problema ottenere il mio sqlite funzionante correttamente in questa applicazione Android che sto sviluppando.Sembra che la tabella non sia stata creata correttamente in base ai messaggi logcat.Mi sento come se stessi fissando troppo a lungo lo schermo.Qualcuno può qui individuare il problema nel mio codice?
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class DBHelper extends SQLiteOpenHelper {
// table name
public static final String TABLE_JOKES = "jokes";
// database field names
public static final String COLUMN_ID = "_id";
public static final String COLUMN_CATEGORY = "category";
public static final String COLUMN_SUBCATEGORY = "subcategory";
public static final String COLUMN_JOKE_TYPE = "jokeType";
public static final String COLUMN_DESCRIPTION = "description";
public static final String COLUMN_QUESTION_TEXT = "questionText";
public static final String COLUMN_ANSWER_TEXT = "answerText";
public static final String COLUMN_MONOLOGUE_TEXT = "monologueText";
public static final String COLUMN_RATING_SCALE = "ratingScale";
public static final String COLUMN_COMMENTS = "comments";
public static final String COLUMN_JOKE_SOURCE = "jokeSource";
public static final String COLUMN_RELEASE_STATUS = "releaseStatus";
public static final String COLUMN_CREATED = "created";
public static final String COLUMN_MODIFIED = "modified";
private static final String DATABASE_NAME = "jokes.db"; // file name
private static final int DATABASE_VERSION = 1;
// Database creation raw SQL statement
private static final String DATABASE_CREATE = "create table " + TABLE_JOKES
+ "( " + COLUMN_ID + " integer primary key autoincrement, "
+ COLUMN_CATEGORY + " text not null, " + COLUMN_SUBCATEGORY
+ " text not null, " + COLUMN_JOKE_TYPE + " integer not null, "
+ COLUMN_DESCRIPTION + " text," + COLUMN_QUESTION_TEXT + "text,"
+ COLUMN_ANSWER_TEXT + "text," + COLUMN_MONOLOGUE_TEXT + "text,"
+ COLUMN_RATING_SCALE + "integer," + COLUMN_COMMENTS + "text,"
+ COLUMN_JOKE_SOURCE + "text," + COLUMN_RELEASE_STATUS + "integer,"
+ COLUMN_CREATED + "text," + COLUMN_MODIFIED + "text" + ");";
// static instance to share DBHelper
private static DBHelper dbHelper = null;
private SQLiteDatabase db ;
/**
* Constructor
*
* @param context
* @param name
* @param factory
* @param version
*/
public DBHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
db = getWritableDatabase();
}
/**
* This is a static method that makes sure that only one database helper
* exists across the app's lifecycle
*
* @param context
* @return
*/
public static DBHelper getDBHelper(Context context) {
if (dbHelper == null) {
dbHelper = new DBHelper(context.getApplicationContext());
}
return dbHelper;
}
/*
* (non-Javadoc)
*
* @see
* android.database.sqlite.SQLiteOpenHelper#onCreate(android.database.sqlite
* .SQLiteDatabase)
*/
@Override
public void onCreate(SQLiteDatabase database) {
database.execSQL(DATABASE_CREATE);
}
/*
* (non-Javadoc)
*
* @see
* android.database.sqlite.SQLiteOpenHelper#onUpgrade(android.database.sqlite
* .SQLiteDatabase, int, int)
*/
@Override
public void onUpgrade(SQLiteDatabase database, int oldVersion, int newVersion) {
Log.w(DBHelper.class.getName(), "Upgrading database from version "
+ oldVersion + " to " + newVersion);
}
/**
* CRUD - Update
*
* @param category
* @param subcategory
* @param jokeType
* @param description
* @param questionText
* @param answerText
* @param monologueText
* @param comments
* @param jokeSource
* @param ratingScale
* @param releaseStatus
* @return
*/
public long insertNewJoke(String category, String subcategory,
int jokeType, String description, String questionText,
String answerText, String monologueText, String comments,
String jokeSource, int ratingScale, int releaseStatus) {
ContentValues cv = new ContentValues();
cv.put(COLUMN_CATEGORY, category);
cv.put(COLUMN_SUBCATEGORY, subcategory);
cv.put(COLUMN_JOKE_TYPE, jokeType);
cv.put(COLUMN_DESCRIPTION, description);
cv.put(COLUMN_QUESTION_TEXT, questionText);
cv.put(COLUMN_ANSWER_TEXT, answerText);
cv.put(COLUMN_MONOLOGUE_TEXT, monologueText);
cv.put(COLUMN_COMMENTS, comments);
cv.put(COLUMN_JOKE_SOURCE, jokeSource);
cv.put(COLUMN_RATING_SCALE, ratingScale);
cv.put(COLUMN_RELEASE_STATUS, releaseStatus);
cv.put(COLUMN_CREATED, ""); // how to put date??
cv.put(COLUMN_CREATED, "");
long code = getWritableDatabase().insert(TABLE_JOKES, null, cv);
return code;
}
/**
* CRUD - Retrieve
*
* @return
*/
public Cursor getJokes() {
String[] columns = { COLUMN_CATEGORY, COLUMN_SUBCATEGORY,
COLUMN_JOKE_TYPE, COLUMN_DESCRIPTION, COLUMN_ANSWER_TEXT,
COLUMN_MONOLOGUE_TEXT, COLUMN_RATING_SCALE, COLUMN_COMMENTS,
COLUMN_JOKE_SOURCE, COLUMN_RELEASE_STATUS, COLUMN_CREATED,
COLUMN_MODIFIED }; // might need the _id column
return getWritableDatabase().query(TABLE_JOKES, columns, null, null,
null, null, null);
}
/**
* CRUD - Delete
*
* @param id
*/
public void deleteJoke(int id) {
getWritableDatabase().delete(TABLE_JOKES, COLUMN_ID + "=?",
new String[] { String.valueOf(id) });
}
}
SO IN ONCREATE () (Nella mia mainattività) Provo a inserire un nuovo record nel database e quindi provare a recuperarlo in un cursore.Tuttavia, sembra essere catturato presso l'istruzione Insert.
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// the projection (fields from the database that we want to use)
String from[] = { DBHelper.COLUMN_DESCRIPTION };
// matching fields on the layout to be used with the adapter
int to[] = { R.id.tv1 };
setContentView(R.layout.activity_main);
lv = (ListView) findViewById(R.id.lvMainJokes);
dbHelper = DBHelper.getDBHelper(this);
long code = dbHelper.insertNewJoke("Holiday", "", 2, "Joke 1 Description", "", "",
"joke", "", "", 5, 1);
if (code != -1)
cursor = dbHelper.getJokes();
...
Ecco l'uscita del logcat:
11-15 15:19:08.040: I/Choreographer(1016): Skipped 45 frames! The application may be doing too much work on its main thread.
11-15 15:19:35.358: D/dalvikvm(1064): GC_FOR_ALLOC freed 58K, 4% free 2726K/2836K, paused 42ms, total 45ms
11-15 15:19:35.368: I/dalvikvm-heap(1064): Grow heap (frag case) to 3.315MB for 635812-byte allocation
11-15 15:19:35.438: D/dalvikvm(1064): GC_FOR_ALLOC freed 2K, 4% free 3344K/3460K, paused 63ms, total 63ms
11-15 15:19:35.548: E/SQLiteLog(1064): (1) table jokes has no column named releaseStatus
11-15 15:19:35.568: E/SQLiteDatabase(1064): Error inserting category=Holiday releaseStatus=1 jokeType=2 created= monologueText=joke description=Joke 1 Description subcategory= answerText= questionText= jokeSource= ratingScale=5 comments=
11-15 15:19:35.568: E/SQLiteDatabase(1064): android.database.sqlite.SQLiteException: table jokes has no column named releaseStatus (code 1): , while compiling: INSERT INTO jokes(category,releaseStatus,jokeType,created,monologueText,description,subcategory,answerText,questionText,jokeSource,ratingScale,comments) VALUES (?,?,?,?,?,?,?,?,?,?,?,?)
11-15 15:19:35.568: E/SQLiteDatabase(1064): at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
11-15 15:19:35.568: E/SQLiteDatabase(1064): at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
11-15 15:19:35.568: E/SQLiteDatabase(1064): at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
11-15 15:19:35.568: E/SQLiteDatabase(1064): at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
11-15 15:19:35.568: E/SQLiteDatabase(1064): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
11-15 15:19:35.568: E/SQLiteDatabase(1064): at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
11-15 15:19:35.568: E/SQLiteDatabase(1064): at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1467)
11-15 15:19:35.568: E/SQLiteDatabase(1064): at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1339)
11-15 15:19:35.568: E/SQLiteDatabase(1064): at com.teamdotgetname.android.phase1.jokeapplication.persistence.DBHelper.insertNewJoke(DBHelper.java:143)
11-15 15:19:35.568: E/SQLiteDatabase(1064): at com.teamdotgetname.android.phase1.jokeapplication.presentation.MainActivity.onCreate(MainActivity.java:53)
11-15 15:19:35.568: E/SQLiteDatabase(1064): at android.app.Activity.performCreate(Activity.java:5133)
11-15 15:19:35.568: E/SQLiteDatabase(1064): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
11-15 15:19:35.568: E/SQLiteDatabase(1064): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
11-15 15:19:35.568: E/SQLiteDatabase(1064): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
11-15 15:19:35.568: E/SQLiteDatabase(1064): at android.app.ActivityThread.access$600(ActivityThread.java:141)
11-15 15:19:35.568: E/SQLiteDatabase(1064): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
11-15 15:19:35.568: E/SQLiteDatabase(1064): at android.os.Handler.dispatchMessage(Handler.java:99)
11-15 15:19:35.568: E/SQLiteDatabase(1064): at android.os.Looper.loop(Looper.java:137)
11-15 15:19:35.568: E/SQLiteDatabase(1064): at android.app.ActivityThread.main(ActivityThread.java:5103)
11-15 15:19:35.568: E/SQLiteDatabase(1064): at java.lang.reflect.Method.invokeNative(Native Method)
11-15 15:19:35.568: E/SQLiteDatabase(1064): at java.lang.reflect.Method.invoke(Method.java:525)
11-15 15:19:35.568: E/SQLiteDatabase(1064): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
11-15 15:19:35.568: E/SQLiteDatabase(1064): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
11-15 15:19:35.568: E/SQLiteDatabase(1064): at dalvik.system.NativeStart.main(Native Method)
11-15 15:19:35.798: I/Choreographer(1064): Skipped 42 frames! The application may be doing too much work on its main thread.
11-15 15:19:35.868: D/gralloc_goldfish(1064): Emulator without GPU emulation detected.
Grazie per aver dato un'occhiata.
Soluzione
A una breve occhiata, il tuo codice sembra buono.L'eccezione:
android.database.sqlite.SQLiteException: table jokes has no column named releaseStatus (code 1)
Sembra errata perché chiaramente si sta creando la colonna releaseStatus nella tua stringa di DATABASE_CREATE della tabella Crea tabella.Ho corso un problema in cui stavo modificando lo schema del mio database e le modifiche non avevano effetto nella mia applicazione perché non stavo incrementando il DATABASE_VERSION.
Le tue opzioni per provare quali farà ricreare il database:
- .
- Cancella i dati delle applicazioni tramite le impostazioni APK
- Disinstallare manualmente quindi reinstallare la tua applicazione.(Justing
gradle installDebugo Avere Eclipse Installa la tua app non è abbastanza buono) - Incremento del tuo valore
DATABASE_VERSION
Altri suggerimenti
Direi che hai bisogno di un po 'di spazio nella creazione di dichiarazioni. Avvio: colonna_question_text + "testo", in colonna_question_text + "testo".
Sembra proprio come non hai spazi tra i nomi delle colonne e i tipi di colonna.Prova questo.
private static final String DATABASE_CREATE = "create table " + TABLE_JOKES
+ "( " + COLUMN_ID + " integer primary key autoincrement, "
+ COLUMN_CATEGORY + " text not null, " + COLUMN_SUBCATEGORY
+ " text not null, " + COLUMN_JOKE_TYPE + " integer not null, "
+ COLUMN_DESCRIPTION + " text," + COLUMN_QUESTION_TEXT + " text,"
+ COLUMN_ANSWER_TEXT + " text," + COLUMN_MONOLOGUE_TEXT + " text,"
+ COLUMN_RATING_SCALE + " integer," + COLUMN_COMMENTS + " text,"
+ COLUMN_JOKE_SOURCE + " text," + COLUMN_RELEASE_STATUS + " integer,"
+ COLUMN_CREATED + " text," + COLUMN_MODIFIED + " text" + ");";
Nel database crea errori "Integer," + commenti della colonna + "testo".Nessun spazio separato
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