1
我想把一個圖像的URL（字符串）到數據庫與SqlHelper類。但是，當我這樣做時，我會遇到一些錯誤。我嘗試了很多方法，但得到同樣的錯誤。也許我不能把http鏈接放在數據庫中？試圖把圖像爲sqlite
以下是我的DB助手：
public class SqlHelper {
String title;
String description;
String image;
private static final String TEXT_TYPE = " TEXT";
private static final String COMMA_SEP = ",";
public static final String KEY_ROWID = "_id";
public static final String KEY_TITLE = "title";
public static final String KEY_DESCRIPTION = "description";
public static final String KEY_IMAGE = "image";
private SqlHelper mDb;
private static final String DATABASE_NAME = "DBCategory";
private static final String DATABASE_TABLE = "categoryTable";
private static final int DATABASE_VERSION = 1;
private static final String SQL_CREATE_ENTRIES =
"CREATE TABLE " + DATABASE_TABLE + " (" +
KEY_ROWID + " INTEGER PRIMARY KEY," +
KEY_TITLE + TEXT_TYPE + COMMA_SEP +
KEY_DESCRIPTION + TEXT_TYPE + COMMA_SEP + KEY_IMAGE + TEXT_TYPE +
")";
private DbHelper ourHelper;
private final Context ourContext;
private SQLiteDatabase ourDatabase;
public SqlHelper(Context c) throws SQLException {
ourContext = c;
try {
open();
} catch (SQLException e) {
e.printStackTrace();
}
}
public SqlHelper open() throws SQLException{
ourHelper = new DbHelper(ourContext);
ourDatabase = ourHelper.getWritableDatabase();
return this;
}
public void close(){
ourHelper.close();
}
private static class DbHelper extends SQLiteOpenHelper{
public DbHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
// TODO Auto-generated constructor stub
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("CREATE TABLE " + DATABASE_TABLE + " (" +
KEY_ROWID + " INTEGER PRIMARY KEY AUTOINCREMENT," +
KEY_TITLE + " TEXT NOT NULL," + KEY_IMAGE + " TEXT NOT NULL," + KEY_DESCRIPTION + " TEXT NOT NULL);"
);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE);
onCreate(db);
}
}
public long createEntry(String title, String image,String description) {
ContentValues cv = new ContentValues();
cv.put(KEY_TITLE, title);
cv.put(KEY_IMAGE, image);
cv.put(KEY_DESCRIPTION,description);
return ourDatabase.insert(DATABASE_TABLE, null, cv);
}
public ArrayList<HashMap<String, String>> getAllData()
{
ArrayList<HashMap<String, String>> array_list = new ArrayList<HashMap<String, String>>();
//hp = new HashMap();
SQLiteDatabase db = this.ourHelper.getReadableDatabase();
Cursor res = db.rawQuery("select * from categoryTable", null);
res.moveToFirst();
while(res.isAfterLast() == false){
HashMap<String,String> hashmap = new HashMap<String, String>();
hashmap.put("title", res.getString(res.getColumnIndex(title)));
hashmap.put("description", res.getString(res.getColumnIndex(description)));
hashmap.put("image", res.getString(res.getColumnIndex(image)));
array_list.add(hashmap);
res.moveToNext();
}
return array_list;
}
}
錯誤：
11910-11929/com.example.vnvbnv.myapplication E/SQLiteLog﹕ (1) table categoryTable has no column named image
09-25 15:56:46.467 11910-11929/com.example.vnvbnv.myapplication E/SQLiteDatabase﹕ Error inserting image=http://moi-pushistye-druzya.narod.ru/images/00073.jpg title=Случайный хомяк 27 description=Случайное фото случайного хомячка. Он тут — для массовости!
android.database.sqlite.SQLiteException: table categoryTable has no column named image (code 1): , while compiling: INSERT INTO categoryTable(image,title,description) VALUES (?,?,?)
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:909)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:520)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1523)
at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1395)
at com.example.vnvbnv.myapplication.SqlHelper.createEntry(SqlHelper.java:93)
at com.example.vnvbnv.myapplication.MainActivity$ProgressTask.doInBackground(MainActivity.java:159)
at com.example.vnvbnv.myapplication.MainActivity$ProgressTask.doInBackground(MainActivity.java:113)
at android.os.AsyncTask$2.call(AsyncTask.java:287)
at java.util.concurrent.FutureTask.run(FutureTask.java:234)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
at java.lang.Thread.run(Thread.java:864)