Java cursor.movetofirst为false时的操作(SQLite)
我正在使用SQLite进行一个项目 我确实在不久前创建了我的db等等,但昨天我从手机上卸载了我的应用程序,并试图通过eclipse再次运行它,似乎从那一刻起,它就不再工作了 首先是守则: 我的SQLHelper:Java cursor.movetofirst为false时的操作(SQLite),java,android,sqlite,cursor,Java,Android,Sqlite,Cursor,我正在使用SQLite进行一个项目 我确实在不久前创建了我的db等等,但昨天我从手机上卸载了我的应用程序,并试图通过eclipse再次运行它,似乎从那一刻起,它就不再工作了 首先是守则: 我的SQLHelper: public class SQLHelper extends SQLiteOpenHelper { public static final String DATABASE_NAME = "listopresto"; public static final String TAB
public class SQLHelper extends SQLiteOpenHelper {
public static final String DATABASE_NAME = "listopresto";
public static final String TABLE_CATEGORIES = "categories";
public static final String CATEGORY_NAME = "name";
public static final String CATEGORY_ID = "id";
public static final String CATEGORY_ID_PARENT = "parent_id";
public static final String CATEGORY_URL_IMAGE = "image_url";
public static final String TABLE_SHOPPING_LIST = "shopping_list";
public static final String SHOPPING_LIST_ID = "shopping_list_id";
public static final String SHOPPING_LIST_NAME = "shopping_list_name";
public static final String SHOPPING_LIST_DATE_CREATION = "shopping_list_date_creation";
public static final String TABLE_SHOPPING_LIST_ITEMS = "shopping_list_items";
public static final String SHOPPING_LIST_ITEMS_LIST_ID = "shopping_list_items_list_id";
public static final String SHOPPING_LIST_ITEMS_ID = "shopping_list_items_id";
public static final String SHOPPING_LIST_ITEMS_NB_ITEMS = "shopping_list_items_nb_items";
public static final String SHOPPING_LIST_ITEMS_CHECKED = "shopping_list_items_checked";
public static final String TABLE_INFOS = "infos";
public static final String INFOS_AGE = "age";
public static final String INFOS_MAIL = "mail";
public static final String INFOS_DISPLAY_PRICE = "display_price";
public static final String INFOS_TOKEN = "token";
public static final String INFOS_REFRESH_TOKEN = "refresh_token";
public static final String INFOS_TOKEN_EXPIRATION = "token_expiration";
public static final String INFOS_REFRESH_TOKEN_EXPIRATION = "refresh_token_expiration";
public static final String INFOS_APP_VERSION = "app_version";
public static final String TABLE_ITEMS = "items";
public static final String ITEM_ID = "id";
public static final String ITEM_NAME = "name";
public static final String ITEM_CATEGORY_ID = "item_category_id";
public static final String ITEM_PRICE = "item_price";
public SQLHelper(Context context){
super(context, DATABASE_NAME, null, 25);
}
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_TABLE_CATEGORIES = "CREATE TABLE " + TABLE_CATEGORIES + "(" + CATEGORY_NAME + " TEXT," + CATEGORY_ID + " INTEGER, " + CATEGORY_ID_PARENT + " INTEGER," + CATEGORY_URL_IMAGE + " TEXT" + ")" ;
String CREATE_TABLE_INFOS = "CREATE TABLE " + TABLE_INFOS + "(" + INFOS_AGE + " INTEGER," + INFOS_MAIL + " TEXT," + INFOS_DISPLAY_PRICE + " TEXT," + INFOS_TOKEN + " TEXT," + INFOS_REFRESH_TOKEN + " TEXT," + INFOS_TOKEN_EXPIRATION + " TEXT, " + INFOS_REFRESH_TOKEN_EXPIRATION + " TEXT, " + INFOS_APP_VERSION + " TEXT" + ")";
String CREATE_TABLE_ITEMS = "CREATE TABLE " + TABLE_ITEMS + "(" + ITEM_ID + " INTEGER," + ITEM_NAME + " TEXT," + ITEM_CATEGORY_ID + " INTEGER," + ITEM_PRICE + " REAL" + ")";
String CREATE_TABLE_SHOPPING_LIST = "CREATE TABLE " + TABLE_SHOPPING_LIST + "(" + SHOPPING_LIST_ID + " INTEGER," + SHOPPING_LIST_NAME + " TEXT," + SHOPPING_LIST_DATE_CREATION + " TEXT" + ")";
String CREATE_TABLE_SHOPPING_LIST_ITEMS = "CREATE TABLE " + TABLE_SHOPPING_LIST_ITEMS + "(" + SHOPPING_LIST_ITEMS_LIST_ID + " INTEGER," + SHOPPING_LIST_ITEMS_ID + " INTEGER," + SHOPPING_LIST_ITEMS_NB_ITEMS + " INTEGER," + SHOPPING_LIST_ITEMS_CHECKED + " INTEGER" + ")";
db.execSQL(CREATE_TABLE_CATEGORIES);
db.execSQL(CREATE_TABLE_INFOS);
db.execSQL(CREATE_TABLE_ITEMS);
db.execSQL(CREATE_TABLE_SHOPPING_LIST);
db.execSQL(CREATE_TABLE_SHOPPING_LIST_ITEMS);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_CATEGORIES);
db.execSQL("DROP TABLE IF EXISTS " + TABLE_INFOS);
db.execSQL("DROP TABLE IF EXISTS " + TABLE_ITEMS);
db.execSQL("DROP TABLE IF EXISTS " + TABLE_SHOPPING_LIST);
db.execSQL("DROP TABLE IF EXISTS " + TABLE_SHOPPING_LIST_ITEMS);
onCreate(db);
}
/*
*
* METHODES TABLE INFOS
* z
*/
public void addInfos(InfosModel infos){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(INFOS_AGE, infos.getAge());
values.put(INFOS_MAIL, infos.getMail());
values.put(INFOS_DISPLAY_PRICE, infos.getDisplayPrice());
values.put(INFOS_TOKEN, infos.getToken());
values.put(INFOS_REFRESH_TOKEN, infos.getRefreshToken());
values.put(INFOS_TOKEN_EXPIRATION, infos.getTokenExpiration());
values.put(INFOS_REFRESH_TOKEN_EXPIRATION, infos.getRefreshTokenExpiration());
values.put(INFOS_APP_VERSION, infos.getAppVersion());
db.insert(TABLE_INFOS, null, values);
db.close();
}
public void updateInfos(InfosModel allInfos){
String Query = "UPDATE " + TABLE_INFOS +
" SET " + INFOS_AGE + "=" + allInfos.getAge() +
", " + INFOS_MAIL + "=\"" + allInfos.getMail() + "\""+
", " + INFOS_DISPLAY_PRICE + "=\"" + allInfos.getDisplayPrice() + "\"" +
", " + INFOS_TOKEN + "=\"" + allInfos.getToken() + "\"" +
", " + INFOS_REFRESH_TOKEN + "=\"" + allInfos.getRefreshToken() + "\"" +
", " + INFOS_TOKEN_EXPIRATION + "=\"" + allInfos.getTokenExpiration() + "\"" +
", " + INFOS_REFRESH_TOKEN_EXPIRATION + "=\"" + allInfos.getRefreshTokenExpiration() + "\"" +
", " + INFOS_APP_VERSION + "=\"" + allInfos.getAppVersion() + "\"";
SQLiteDatabase db = this.getReadableDatabase();
db.execSQL(Query);
}
public InfosModel getInfos(){
String selectQuery = "SELECT * FROM " + TABLE_INFOS;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
if (cursor != null){
if (cursor.moveToFirst()){
InfosModel infos = new InfosModel();
infos.setMail(cursor.getString(cursor.getColumnIndex(INFOS_MAIL)));
infos.setAge(cursor.getInt(cursor.getColumnIndex(INFOS_AGE)));
infos.setDisplayPrice(cursor.getString(cursor.getColumnIndex(INFOS_DISPLAY_PRICE)));
infos.setToken(cursor.getString(cursor.getColumnIndex(INFOS_TOKEN)));
infos.setRefreshToken(cursor.getString(cursor.getColumnIndex(INFOS_REFRESH_TOKEN)));
infos.setTokenExpiration(cursor.getString(cursor.getColumnIndex(INFOS_TOKEN_EXPIRATION)));
infos.setRefreshTokenExpiration(cursor.getString(cursor.getColumnIndex(INFOS_REFRESH_TOKEN_EXPIRATION)));
infos.setAppVersion(cursor.getString(cursor.getColumnIndex(INFOS_APP_VERSION)));
cursor.close();
return (infos);
}
}
return (null);
}
public int getInfosCount() {
String countQuery = "SELECT * FROM " + TABLE_INFOS;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(countQuery, null);
int cnt = cursor.getCount();
cursor.close();
return cnt;
}
}
我正在使用函数getInfo的java活动:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splash_screen);
SQLHelper sqlHelper = new SQLHelper(this);
InfosModel infos = sqlHelper.getInfos();
Log.i("infos", infos.getMail());
}
我认为问题来自getInfos()函数
我的游标不是空的,但是函数moveToFirst()失败了,但我不知道为什么,也不知道该怎么做才能解决这个问题,因为我以前从未遇到过这个问题,而且我的数据库工作得很好
谢谢你的帮助:)
博图斯
编辑:我试图查看infos表中有多少行,其中有零行,这就是movetofirst()失败的原因,我相信,但如果表中有一行,则行为完全相同。根据:
如果光标为空,此方法将返回false
因此,您必须在那里没有任何数据,并且应该进行适当的管理。检查打字错误等。根据:
如果光标为空,此方法将返回false
因此,您必须在那里没有任何数据,并且应该进行适当的管理。检查输入错误等。您会遇到什么错误?您会遇到什么错误?请参阅:编辑:我尝试查看infos表中有多少行,没有行,这就是movetofirst()失败的原因,我相信,但如果表中有行,行为完全相同。如果有任何行,行为都不相同,我一直用这个。如果要查看有多少行,请参阅Cursor.getCount(),它应该可以让您验证行数。这就是我使用函数getInfoScont所做的,返回的数字正好是0。您没有任何行,这就是函数返回false的原因。请参阅:编辑:我尝试查看infos表中有多少行,其中有零行,这就是movetofirst()失败的原因,我相信,但如果表中有行,则行为完全相同。如果有任何行,则行为不同,我一直用这个。如果要查看有多少行,请参阅Cursor.getCount(),它应该可以让您验证行数。这就是我使用函数getInfoScont所做的,返回的数字正好是0。您没有任何行,这就是函数返回false的原因。