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Tôi đang viết một cơ sở dữ liệu trong ứng dụng android của mình, nhưng các bảng của tôi không được tạo. Tôi đã thêm các điểm ngắt tại phương thức onCreate của tôi, và getWriteableDatabase của tôi, và getWritableDatabase được gọi, nhưng onCreate thì không.onCreate() không được gọi bởi getWritableDatabase()
package com.fslade.app;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class DatabaseHelper extends SQLiteOpenHelper {
private static final String DATABASE_NAME = "applicationdata";
private static final int DATABASE_VERSION = 1;
public static final String DATABASE_TABLE = "peopleT";
// Database creation sql statement
private static final String DATABASE_CREATE = "create table " + DATABASE_TABLE + " (_id integer primary key autoincrement, "
+ "company_name text not null, name text not null, city text not null, vertical text not null, title text not null, email text not null, bio text not null, photo text not null, status text not null);";
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
// Method is called during creation of the database
@Override
public void onCreate(SQLiteDatabase database) {
database.execSQL(DATABASE_CREATE);
}
// Method is called during an upgrade of the database, e.g. if you increase
// the database version
@Override
public void onUpgrade(SQLiteDatabase database, int oldVersion,
int newVersion) {
Log.w(DatabaseHelper.class.getName(),
"Upgrading database from version " + oldVersion + " to "
+ newVersion + ", which will destroy all old data");
database.execSQL("DROP TABLE IF EXISTS todo");
onCreate(database);
}
}
Và trong helper cơ sở dữ liệu của tôi, tôi gọi getWriteableDatabse():
package com.fslade.app;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
public class ContentStorageHelper {
public static final String KEY_ID = "_id";
public static final String KEY_COMPANY_NAME = "company_name";
public static final String KEY_PERSON_NAME = "name";
public static final String KEY_CITY = "city";
public static final String KEY_VERTICAL = "vertical";
public static final String KEY_TITLE = "title";
public static final String KEY_EMAIL = "email";
public static final String KEY_BIO = "bio";
public static final String KEY_PHOTO = "photo";
public static final String KEY_STATUS = "status";
private static final String[] COLUMNS = { KEY_ID, KEY_COMPANY_NAME,
KEY_PERSON_NAME, KEY_CITY, KEY_VERTICAL, KEY_TITLE, KEY_EMAIL,
KEY_BIO, KEY_PHOTO, KEY_STATUS };
private Context context;
private SQLiteDatabase database;
private DatabaseHelper dbHelper;
public ContentStorageHelper(Context context) {
this.context = context;
}
public ContentStorageHelper open() throws SQLException {
dbHelper = new DatabaseHelper(context);
database = dbHelper.getWritableDatabase();
// dbHelper.onCreate(database);
// I added this onCreate() to see if it helped, but when I ran it
// it said that the database had already been created
return this;
}
public void close() {
dbHelper.close();
}
/**
* Create a new person If the person is successfully created return the new
* rowId for that person, otherwise return a -1 to indicate failure.
*/
public long createPerson(String company_name, String name, String city,
String vertical, String title, String email, String bio,
String photo, String status) {
ContentValues initialValues = createContentValues(company_name, name,
city, vertical, title, email, bio, photo, status);
return database.insert(DatabaseHelper.DATABASE_TABLE, null,
initialValues);
}
/**
* Return a Cursor over the list of all people in the database
*
* @return Cursor over all notes
*/
public Cursor fetchPeopleByVertical(String vertical) {
String selection = KEY_VERTICAL+"="+vertical;
Cursor result = database.query(DatabaseHelper.DATABASE_TABLE, COLUMNS,
selection, null, null, null, null);
return result;
}
private ContentValues createContentValues(String company_name, String name,
String city, String vertical, String title, String email,
String bio, String photo, String status) {
ContentValues values = new ContentValues();
values.put(KEY_COMPANY_NAME, company_name);
values.put(KEY_PERSON_NAME, name);
values.put(KEY_CITY, city);
values.put(KEY_VERTICAL, vertical);
values.put(KEY_TITLE, title);
values.put(KEY_EMAIL, email);
values.put(KEY_BIO, bio);
values.put(KEY_PHOTO, photo);
values.put(KEY_STATUS, status);
System.out.print("test: " + status);
return values;
}
}
Có thể trùng lặp với phương thức [Android SQLiteOpenHelper: onCreate() không được gọi. Tại sao?] (Http://stackoverflow.com/questions/6791852/android-sqliteopenhelper-oncreate-method-is-not-called-why) – Machavity