我为android中的照片创建了一个数据库。代码如下。
public class PhotoDataHandler extends SQLiteOpenHelper {
// All Static variables
// Database Version
private static final int DATABASE_VERSION = 77;
// Database Name
private static final String DATABASE_NAME = "photos";
// DATA table name
private static final String TABLE_PHOTOS = "PHOTOS";
// DATA Table Columns names
private static final String KEY_ID = "id";
private static final String PHOTO_ID = "photo_id";
private static final String KEY_JSON = "json";
public PhotoDataHandler(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_DATA_TABLE = "CREATE TABLE " + TABLE_PHOTOS + "("
+ KEY_ID + " INTEGER PRIMARY KEY," + KEY_JSON + " TEXT"
+ PHOTO_ID + " TEXT" + ")";
db.execSQL(CREATE_DATA_TABLE);
}
// Upgrading database
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_PHOTOS);
// Create tables again
onCreate(db);
}
// truncate all data
public void truncateAllData() {
SQLiteDatabase db = this.getReadableDatabase();
db.execSQL("DELETE FROM " + TABLE_PHOTOS);
db.close();
}
// Add new DATA
public void addPhoto(Photo photo) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_JSON, photo.getID());
values.put(PHOTO_ID, photo.getphotoId());
values.put(KEY_JSON, photo.getPhotoString());
// Inserting Row
db.insert(TABLE_PHOTOS, null, values);
db.close(); // Closing database connection
}
public Photo getLastPhotos() {
SQLiteDatabase db = this.getReadableDatabase();
String selectQuery = "SELECT * FROM " + TABLE_PHOTOS
+ " ORDER BY id DESC LIMIT 1";
Cursor cursor = db.rawQuery(selectQuery, null);
if (cursor.getCount() != 0) {
cursor.moveToFirst();
Photo photo = new Photo(cursor.getString(1));
db.close();
return photo;
} else {
Photo photo = new Photo();
db.close();
return photo;
}
}
// Getting All DATA
public List<Photo> getAllData() {
List<Photo> PhotoList = new ArrayList<Photo>();
// Select All Query
String selectQuery = "SELECT * FROM " + TABLE_PHOTOS;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
Photo photo = new Photo();
photo.setID(Integer.parseInt(cursor.getString(0)));
photo.setPhotoString((cursor.getString(1)));
//error is in this line : from logcat
**photo.setphotoId((Integer.parseInt(cursor.getString(2))));**
// Adding contact to list
PhotoList.add(photo);
} while (cursor.moveToNext());
}
// return user list
db.close();
return PhotoList;
}
}
我正在使用此方法添加照片：
final PhotoDataHandler photodb = new PhotoDataHandler(context.getApplicationContext());
photodb.addPhoto(new Photo(61, 8, "String"));
photodb.addPhoto(new Photo(62, 9, "String of photo"));
当我想在数据库中获取所有日期时，我使用sql PhotoDataHandler类中的方法写入：
String alldata = "null";
List<Photo> photos = photodb.getAllData();
int nr_photos=0;
for(Photo x:photos){
System.out.println("nr of line : " + nr_photos +" photos id "+x.getID()+ "Stringas yra : "+ x.getPhotoString()+ " dar vienas id yra : " + x.getphotoId()) ;
nr_photos++;
}
每次我使用它时都会感到恐惧。 log cat看起来像这样：
05-08 11:16:52.489: E/SQLiteLog(2256): (1) table PHOTOS has no column named photo_id
05-08 11:16:52.499: E/SQLiteDatabase(2256): Error inserting id=131 photo_id=62 json=vienas
05-08 11:16:52.499: E/SQLiteDatabase(2256): android.database.sqlite.SQLiteException: table PHOTOS has no column named photo_id (code 1): , while compiling: INSERT INTO PHOTOS(id,photo_id,json) VALUES (?,?,?)
05-08 11:16:52.499: E/SQLiteDatabase(2256): at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
05-08 11:16:52.499: E/SQLiteDatabase(2256): at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
05-08 11:16:52.499: E/SQLiteDatabase(2256): at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
05-08 11:16:52.499: E/SQLiteDatabase(2256): at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
05-08 11:16:52.499: E/SQLiteDatabase(2256): at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
05-08 11:16:52.499: E/SQLiteDatabase(2256): at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
05-08 11:16:52.499: E/SQLiteDatabase(2256): at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1467)
05-08 11:16:52.499: E/SQLiteDatabase(2256): at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1339)
05-08 11:16:52.499: E/SQLiteDatabase(2256): at com.project.sqlite.PhotoDataHandler.addPhoto(PhotoDataHandler.java:68)
05-08 11:16:52.499: E/SQLiteDatabase(2256): at com.project.elements.Element$3.onClick(Element.java:730)
05-08 11:16:52.499: E/SQLiteDatabase(2256): at android.view.View.performClick(View.java:4438)
05-08 11:16:52.499: E/SQLiteDatabase(2256): at android.view.View$PerformClick.run(View.java:18422)
05-08 11:16:52.499: E/SQLiteDatabase(2256): at android.os.Handler.handleCallback(Handler.java:733)
05-08 11:16:52.499: E/SQLiteDatabase(2256): at android.os.Handler.dispatchMessage(Handler.java:95)
05-08 11:16:52.499: E/SQLiteDatabase(2256): at android.os.Looper.loop(Looper.java:136)
05-08 11:16:52.499: E/SQLiteDatabase(2256): at android.app.ActivityThread.main(ActivityThread.java:5017)
05-08 11:16:52.499: E/SQLiteDatabase(2256): at java.lang.reflect.Method.invokeNative(Native Method)
05-08 11:16:52.499: E/SQLiteDatabase(2256): at java.lang.reflect.Method.invoke(Method.java:515)
05-08 11:16:52.499: E/SQLiteDatabase(2256): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
05-08 11:16:52.499: E/SQLiteDatabase(2256): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
05-08 11:16:52.499: E/SQLiteDatabase(2256): at dalvik.system.NativeStart.main(Native Method)
有经验的人可以告诉我这个问题吗？
答案 0 :(得分：3)
你错了吗
+ KEY_ID + " INTEGER PRIMARY KEY," + KEY_JSON + " TEXT" // forget to add , comma after TEXT
以下
更正String CREATE_DATA_TABLE = "CREATE TABLE " + TABLE_PHOTOS + "("
+ KEY_ID + " INTEGER PRIMARY KEY, " + KEY_JSON + " TEXT, "
+ PHOTO_ID + " TEXT" + ")";