Android 内容提供商没有这样的表
我完全迷路了。。。这是我的密码:Android 内容提供商没有这样的表,android,android-contentprovider,sqliteopenhelper,sqlite,Android,Android Contentprovider,Sqliteopenhelper,Sqlite,我完全迷路了。。。这是我的密码: public class MainContentProvider extends ContentProvider { //DataBase private WordsOpenHelper db_words; private CategoryOpenHelper db_category; //helper Strings to build the URI private static String AUTHORITY = "com.ivanvoynov.dict
public class MainContentProvider extends ContentProvider {
//DataBase
private WordsOpenHelper db_words;
private CategoryOpenHelper db_category;
//helper Strings to build the URI
private static String AUTHORITY = "com.ivanvoynov.dictionary.ContentProvider";
private static String BASE_PATH_WORDS = WordsOpenHelper.TABLE_NAME;
private static String BASE_PATH_CATEGORY = CategoryOpenHelper.TABLE_NAME;
//Content URI and the data types MIME
public static final Uri CONTENT_URI_WORDS = Uri.parse("content://" + AUTHORITY + "/" + BASE_PATH_WORDS);
public static final Uri CONTENT_URI_CATEGORY = Uri.parse("content://" + AUTHORITY + "/" + BASE_PATH_CATEGORY);
public static final String CONTENT_TYPE = ContentResolver.CURSOR_DIR_BASE_TYPE + BASE_PATH_WORDS;
public static final String CONTENT_ITEM_TYPE = ContentResolver.CURSOR_ITEM_BASE_TYPE + BASE_PATH_WORDS;
//our private variable to help match the URI types
private static final int ALL_ROWS_WORDS = 0;
private static final int ID_ROW_WORDS = 1;
private static final int ALL_ROWS_CATEGORY = 2;
private static final int ID_ROW_CATEGORY = 3;
//our URI matcher class to match our uri's
private static final UriMatcher sUriMatcher = new UriMatcher(UriMatcher.NO_MATCH);
static{
sUriMatcher.addURI(AUTHORITY, BASE_PATH_WORDS, ALL_ROWS_WORDS);
sUriMatcher.addURI(AUTHORITY, BASE_PATH_WORDS + "/#", ID_ROW_WORDS);
sUriMatcher.addURI(AUTHORITY, BASE_PATH_CATEGORY, ALL_ROWS_CATEGORY);
sUriMatcher.addURI(AUTHORITY, BASE_PATH_CATEGORY + "/#", ID_ROW_CATEGORY);
}
@Override
public boolean onCreate() {
db_words = new WordsOpenHelper(getContext());
db_category = new CategoryOpenHelper(getContext());
return false;
}
@Override
public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs, String sortOrder) {
//create the query builder
SQLiteQueryBuilder queryBuilder = new SQLiteQueryBuilder();
//our database initialization
SQLiteDatabase database;
Cursor cursor;
//implement check column projection later on...
//implement all of them to return all with specific crap.
int uriType = sUriMatcher.match(uri);
switch (uriType){
case ALL_ROWS_WORDS:
//all words are asked
database = db_words.getWritableDatabase();
queryBuilder.setTables(WordsOpenHelper.TABLE_NAME);
cursor = queryBuilder.query(database, projection, selection, selectionArgs, null, null, sortOrder);
cursor.setNotificationUri(getContext().getContentResolver(), uri);
return cursor;
case ALL_ROWS_CATEGORY:
//all words are asked
database = db_category.getWritableDatabase();
queryBuilder.setTables(db_category.TABLE_NAME);
cursor = queryBuilder.query(database, projection, selection, selectionArgs, null, null, sortOrder);
cursor.setNotificationUri(getContext().getContentResolver(), uri);
return cursor;
case ID_ROW_WORDS:
//append to the table a new thing
queryBuilder.setTables(db_words.TABLE_NAME);
queryBuilder.appendWhere(db_words.KEY_ROW_ID + "=" + uri.getLastPathSegment());
database = db_words.getWritableDatabase();
cursor = queryBuilder.query(database, projection, selection, selectionArgs, null, null, sortOrder);
cursor.setNotificationUri(getContext().getContentResolver(), uri);
return cursor;
case ID_ROW_CATEGORY:
//this is the category's row id selection
queryBuilder.setTables(db_category.TABLE_NAME);
queryBuilder.appendWhere(db_category.KEY_ROW_ID + "=" + uri.getLastPathSegment());
database = db_category.getWritableDatabase();
cursor = queryBuilder.query(database, projection, selection, selectionArgs, null, null, sortOrder);
cursor.setNotificationUri(getContext().getContentResolver(), uri);
return cursor;
default:
throw new IllegalArgumentException("Unknown URI: " + uri + "URI TYPE = " + uriType);
}
}
这是Open helper:
public class WordsOpenHelper extends SQLiteOpenHelper{
//general info about the DataBase
public static final String DATABASE_NAME = "dictionary.db";
public static final String TABLE_NAME = "vocabulary";
private static final int DATABASE_VERSION = 1;
//DataBase columns
public static final String KEY_ROW_ID = "_id";
public static final String KEY_WORD = "word";
public static final String KEY_DEFINITION = "definition";
public static final String KEY_EXAMPLES = "examples";
public static final String KEY_DIFFICULTY = "difficulty"; //new term
public static final String KEY_SUBCATEGORY = "subcategory"; //new
public static final String KEY_COLOR = "color"; //new
public static final String KEY_LEARNED_FLAG = "learned_flag"; //new
public static final String KEY_ARCHIVED_FLAG = "archived_flag"; //new
public static final String KEY_TIMES_VIEWED = "times_viewed"; //count
public static final String KEY_TIMES_CORRECT = "times_correct"; //new coint
public static final String KEY_TIMES_INCORRECT = "times_incorrect"; //new
public static final String KEY_TIMES_SKIPPED = "times_skipped"; //new
public static final String KEY_LANGUAGE = "language"; //newone
public static final String KEY_SYNONYMS = "synonyms";
public static final String KEY_PART_OF_SPEECH = "part_of_speech";
public static final String KEY_CATEGORIES = "categories";
public static final String KEY_RECENT_FLAG = "recent_flag";
public static final String KEY_UNDEFINED_FLAG = "defined_flag";
//projection used in conjunction with other crap to form URI
public static final String[] PROJECTION = new String[]{
KEY_ROW_ID,
KEY_WORD,
KEY_DEFINITION,
KEY_DIFFICULTY,
KEY_EXAMPLES,
KEY_SYNONYMS,
KEY_PART_OF_SPEECH,
KEY_CATEGORIES,
KEY_RECENT_FLAG,
KEY_UNDEFINED_FLAG,
KEY_SUBCATEGORY,
KEY_COLOR,
KEY_LEARNED_FLAG,
KEY_ARCHIVED_FLAG,
KEY_TIMES_VIEWED,
KEY_TIMES_CORRECT,
KEY_TIMES_INCORRECT,
KEY_TIMES_SKIPPED,
KEY_LANGUAGE
};
//the table raw SQLite command to create it.
private static final String DICTIONARY_TABLE_CREATE =
"CREATE TABLE " + TABLE_NAME + " ("
+ KEY_ROW_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
+ KEY_WORD + " TEXT,"
+ KEY_DEFINITION + " TEXT,"
+ KEY_DIFFICULTY + " INTEGER,"
+ KEY_EXAMPLES + " TEXT,"
+ KEY_SYNONYMS + " TEXT,"
+ KEY_PART_OF_SPEECH +" TEXT, "
+ KEY_CATEGORIES + " TEXT, "
+ KEY_RECENT_FLAG + " TEXT,"
+ KEY_UNDEFINED_FLAG + " TEXT,"
+ KEY_SUBCATEGORY + " TEXT,"
+ KEY_COLOR + " TEXT,"
+ KEY_LEARNED_FLAG + " TEXT,"
+ KEY_ARCHIVED_FLAG + " TEXT,"
+ KEY_TIMES_VIEWED + " INTEGER,"
+ KEY_TIMES_CORRECT + " INTEGER,"
+ KEY_TIMES_INCORRECT + " INTEGER,"
+ KEY_TIMES_SKIPPED + " INTEGER,"
+ KEY_LANGUAGE + " TEXT "
+ ");";
public WordsOpenHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(DICTIONARY_TABLE_CREATE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVerson, int newVersion){
//delete the table if it exists when upgrading
db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
onCreate(db);
}
}
我不断发现这个错误:
Caused by: android.database.sqlite.SQLiteException: no such table: vocabulary (code 1): , while compiling: SELECT _id, word, definition, difficulty, examples, synonyms, part_of_speech, categories, recent_flag, defined_flag, subcategory, color, learned_flag, archived_flag, times_viewed, times_correct, times_incorrect, times_skipped, language FROM vocabulary
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37)
at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1314)
at android.database.sqlite.SQLiteQueryBuilder.query(SQLiteQueryBuilder.java:400)
at android.database.sqlite.SQLiteQueryBuilder.query(SQLiteQueryBuilder.java:294)
at com.ivanvoynov.dictionary.ContentProvider.MainContentProvider.query(MainContentProvider.java:80)
原因:android.database.sqlite.sqlite异常:无此表:词汇表(代码1):,编译时:选择id、单词、定义、难度、示例、同义词、词性、类别、最近的\u标志、定义的\u标志、子类别、颜色、学习的\u标志、存档的\u标志、查看的次数、更正的次数、不正确的次数、跳过的次数,词汇中的语言
位于android.database.sqlite.SQLiteConnection.nativePrepareStatement(本机方法)
位于android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
位于android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
位于android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
位于android.database.sqlite.SQLiteProgram.(SQLiteProgram.java:58)
位于android.database.sqlite.SQLiteQuery(SQLiteQuery.java:37)
位于android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44)
位于android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1314)
位于android.database.sqlite.SQLiteQueryBuilder.query(SQLiteQueryBuilder.java:400)
位于android.database.sqlite.SQLiteQueryBuilder.query(SQLiteQueryBuilder.java:294)
在com.ivanvoynov.dictionary.ContentProvider.MainContentProvider.query(MainContentProvider.java:80)上
我浪费了整个晚上。。。据我所知,该表尚未创建。我不明白为什么它没有被创造出来。当我重新安装应用程序时,这是我一直得到的。根据评论,您有两个使用相同数据库文件的数据库助手。下面是发生的情况:
getWritableDatabase()
时创建的。将调用帮助程序的onCreate()
。数据库文件的版本设置为database\u version
getWritableDatabase()
时打开。数据库文件已存在且版本正确,因此未调用onUpgrade()
或onCreate()
。但是这个数据库没有helper2的表解决方案:每个数据库文件只有一个数据库帮助器。您可以在一个帮助程序中有多个表。根据注释,您有两个使用相同数据库文件的数据库帮助程序。下面是发生的情况:
getWritableDatabase()
时创建的。将调用帮助程序的onCreate()
。数据库文件的版本设置为database\u version
getWritableDatabase()
时打开。数据库文件已存在且版本正确,因此未调用onUpgrade()
或onCreate()
。但是这个数据库没有helper2的表解决方案:每个数据库文件只有一个数据库帮助器。您可以在一个帮助程序中有多个表。卸载应用程序,以便删除旧版本的数据库,并再次运行
onCreate()
。这没有帮助,它总是卡在queryBuilder.query()函数上。似乎open helper在内容提供商访问该表之前没有创建该表……另一个数据库helper是什么?它是否使用了相同的数据库文件?请将数据库作为参数和类型运行sqlite3。schema@laalto对的确谢谢你,我真傻,竟然复制了数据库助手并拥有了两个。基本上,当创建第二个数据库时(都使用相同的数据库名称),它会将前一个数据库与其表一起删除。解决方案:将两个数据库打开帮助程序合并为一个。再次感谢;)卸载你的应用程序,以便删除旧版本的数据库,并再次运行onCreate()
。这没有帮助,它总是卡在queryBuilder.query()函数上。似乎open helper在内容提供商访问该表之前没有创建该表……另一个数据库helper是什么?它是否使用了相同的数据库文件?请将数据库作为参数和类型运行sqlite3。schema@laalto对的确谢谢你,我真傻,竟然复制了数据库助手并拥有了两个。基本上,当创建第二个数据库时(都使用相同的数据库名称),它会将前一个数据库与其表一起删除。解决方案:将两个数据库打开帮助程序合并为一个。再次感谢;)