好的,我现在真的很困惑。我正在尝试为我的程序添加一个新表,但每当我崩溃时,特别是在onCreate方法上崩溃。我无法为我的爱找出原因。有什么建议吗?
这也是我遇到的错误,但我无法在任何地方找到categories.db
引起:android.database.sqlite.SQLiteException:没有这样的表:categories.db(代码1):,同时编译:SELECT * FROM categories.db
private final static int DB_VERSION = 2;
public static String TABLE_NAME = "players";
public static String DB_NAME = "playerslist.db";
public static String SCORE = "score";
public static String ID = "_id";
public static String PLAYER_NAME = "name";
public static String CATEGORY_TABLE_NAME = "categories";
public static String CATEGORY_NAME = "category_name";
public static String CATEGORY_VALUE = "category_value";
public static String CATEGORY_ID = "category_id";
public static String CATEGORY_PLAYER_ID = "category_player_id";
public static String CREATE_PLAYER_TABLE = "CREATE TABLE "+TABLE_NAME+" ("+ID+" INTEGER PRIMARY KEY AUTOINCREMENT, "+PLAYER_NAME+" TEXT, "+
SCORE+" TEXT)";
public static String CREATE_CATEGORY_TABLE = "CREATE TABLE "+CATEGORY_TABLE_NAME+"("+CATEGORY_ID+" INTEGER" +
"PRIMARY KEY AUTOINCREMENT, "+CATEGORY_NAME+" TEXT, "+CATEGORY_VALUE+" INTEGER, "
+CATEGORY_PLAYER_ID+" INTEGER)";
public SQLHelp(Context context) {
super(context, DB_NAME, null, 2);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(CREATE_PLAYER_TABLE);
db.execSQL(CREATE_CATEGORY_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
for(int i = oldVersion; i < newVersion; i++){
switch(i){
case 1:
db.execSQL(CREATE_CATEGORY_TABLE);
break;
}
}
}
答案 0 :(得分:0)
更改您的CREATE TABLE字符串以包含IF NOT EXISTS
as,
CREATE TABLE IF NOT EXISTS Table_name(Columns)
答案 1 :(得分:0)
从设备或模拟器中删除您的应用程序,然后再次安装/运行,它应该可以正常工作。
我遇到了同样的问题,我简单地从设备中删除应用程序并且它有效。
答案 2 :(得分:0)
试试这个..
在创建第二个表时,您有“INTEGER”+“PRIMARY KEY AUTOINCREMENT”..
我把它做成了一个。
public static String CREATE_CATEGORY_TABLE = "CREATE TABLE "+CATEGORY_TABLE_NAME+"("+CATEGORY_ID+ " INTEGER PRIMARY KEY AUTOINCREMENT, "+CATEGORY_NAME+" TEXT, "+CATEGORY_VALUE+" INTEGER, "
+CATEGORY_PLAYER_ID+" INTEGER)";
你应该调用SQLiteOpenHelper
private static class DatabaseHelper extends SQLiteOpenHelper{
DatabaseHelper(Context context){
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
public void onCreate(SQLiteDatabase db){
db.execSQL(CREATE_PLAYER_TABLE);
db.execSQL(CREATE_CATEGORY_TABLE);
}
public void onUpgrade(SQLiteDatabase db, int arg1, int arg2{
db.execSQL("DROP TABLE IF EXISTS " + CREATE_PLAYER_TABLE);
db.execSQL("DROP TABLE IF EXISTS " + CREATE_CATEGORY_TABLE);
onCreate(db);
}