将行插入SQlite时java Android应用程序崩溃？
这就是我正在使用的DBAdapter，由于某种原因，当我尝试插入一行时，应用程序崩溃
public class DBAdapter {
private static final String TAG = "DBAdapter"; //used for logging database version changes
// Field Names:
static final String KEY_ROWID = "Row ID";
static final String NAME_COLUMN = "Name";
static final String EMAIL_COLUMN = "E-mail";
static final String PHONENUMBER_COLUMN = "Phone Number";
static final String ADDRESS_COLUMN = "Street Address";
static final String ZIP_COLUMN = "Zip Code";
static final String ARRIVAL_COLUMN = "Arrival Date";
static final String DEPARTURE_COLUMN = "Departure Date";
static final String ROOM_COLUMN = "Room Number";
static final String NOTES_COLUMN = "Notes Area";
public static final String[] ALL_KEYS = new String[] {NAME_COLUMN, EMAIL_COLUMN, PHONENUMBER_COLUMN, ADDRESS_COLUMN, ZIP_COLUMN, ARRIVAL_COLUMN, DEPARTURE_COLUMN, ROOM_COLUMN, NOTES_COLUMN};
// Column Numbers for each Field Name:
public static final int COL_ROWID = 0;
public static final int COL_NAME = 1;
public static final int COL_EMAIL = 2;
public static final int COL_PHONENUMBER = 3;
public static final int COL_ADDRESS = 4;
public static final int COL_ZIP = 5;
public static final int COL_ARRIVAL = 6;
public static final int COL_DEPARTURE = 7;
public static final int COL_ROOM = 8;
public static final int COL_NOTES = 9;
// DataBase info:
static final String DATABASE_NAME = "Reservations.db";
static final String DATABASE_TABLE = "Reservations";
public static final int DATABASE_VERSION = 2; // The version number must be incremented each time a change to DB structure occurs.
//SQL statement to create database
private static final String DATABASE_CREATE_SQL =
"CREATE TABLE " + DATABASE_TABLE
+ " (" + KEY_ROWID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
+ NAME_COLUMN + " TEXT NOT NULL, "
+ EMAIL_COLUMN + " TEXT"
+ PHONENUMBER_COLUMN + " TEXT NOT NULL, "
+ ADDRESS_COLUMN + " TEXT"
+ ZIP_COLUMN + " TEXT NOT NULL, "
+ ARRIVAL_COLUMN + " TEXT NOT NULL, "
+ DEPARTURE_COLUMN + " TEXT"
+ ROOM_COLUMN + " TEXT NOT NULL, "
+ NOTES_COLUMN + " TEXT"
+ ");";
private final Context context;
private DatabaseHelper myDBHelper;
private SQLiteDatabase db;
public DBAdapter(Context ctx) {
this.context = ctx;
myDBHelper = new DatabaseHelper(context);
}
// Open the database connection.
public DBAdapter open() {
db = myDBHelper.getWritableDatabase();
return this;
}
// Close the database connection.
public void close() {
myDBHelper.close();
}
// Add a new set of values to be inserted into the database.
public long insertRow(String nameValue, String emailValue, String phoneValue, String addressValue, String zipValue, String arrivalValue, String departureValue, String roomValue, String notesValue) {
ContentValues initialValues = new ContentValues();
initialValues.put(NAME_COLUMN, nameValue);
initialValues.put(EMAIL_COLUMN, emailValue);
initialValues.put(PHONENUMBER_COLUMN, phoneValue);
initialValues.put(ADDRESS_COLUMN, addressValue);
initialValues.put(ZIP_COLUMN, zipValue);
initialValues.put(ARRIVAL_COLUMN, arrivalValue);
initialValues.put(DEPARTURE_COLUMN, departureValue);
initialValues.put(ROOM_COLUMN, roomValue);
initialValues.put(NOTES_COLUMN, notesValue);
// Insert the data into the database.
return db.insert(DATABASE_TABLE, null, initialValues);
}
// Delete a row from the database, by rowId (primary key)
public boolean deleteRow(long rowId) {
String where = KEY_ROWID + "=" + rowId;
return db.delete(DATABASE_TABLE, where, null) != 0;
}
public void deleteAll() {
Cursor c = getAllRows();
long rowId = c.getColumnIndexOrThrow(KEY_ROWID);
if (c.moveToFirst()) {
do {
deleteRow(c.getLong((int) rowId));
} while (c.moveToNext());
}
c.close();
}
// Return all data in the database.
public Cursor getAllRows() {
String where = null;
Cursor c = db.query(true, DATABASE_TABLE, ALL_KEYS, where, null, null, null, null, null);
if (c != null) {
c.moveToFirst();
}
return c;
}
// Get a specific row (by rowId)
public Cursor getRow(long rowId) {
String where = KEY_ROWID + "=" + rowId;
Cursor c = db.query(true, DATABASE_TABLE, ALL_KEYS,
where, null, null, null, null, null);
if (c != null) {
c.moveToFirst();
}
return c;
}
// Change an existing row to be equal to new data.
public boolean updateRow(long rowId, String name, String email, String phone, String address, String zipcode, String arrival, String departure, String room, String notes) {
String where = KEY_ROWID + "=" + rowId;
ContentValues newValues = new ContentValues();
newValues.put(NAME_COLUMN, name);
newValues.put(EMAIL_COLUMN, email);
newValues.put(ADDRESS_COLUMN, address);
newValues.put(ZIP_COLUMN, zipcode);
newValues.put(ARRIVAL_COLUMN, arrival);
newValues.put(DEPARTURE_COLUMN, departure);
newValues.put(ROOM_COLUMN, room);
newValues.put(NOTES_COLUMN, notes);
// Insert it into the database.
return db.update(DATABASE_TABLE, newValues, where, null) != 0;
}
private static class DatabaseHelper extends SQLiteOpenHelper
{
DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase _db) {
_db.execSQL(DATABASE_CREATE_SQL);
}
@Override
public void onUpgrade(SQLiteDatabase _db, int oldVersion, int newVersion) {
Log.w(TAG, "Upgrading application's database from version " + oldVersion
+ " to " + newVersion + ", which will destroy all old data!");
// Destroy old database:
_db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE);
// Recreate new database:
onCreate(_db);
}
}
}
这是我新预订活动的代码
public void createReservation(View view) {
db.open();
EditText nameText = (EditText)findViewById(R.id.nameText);
String nameValue = nameText.getText().toString();
EditText emailText = (EditText)findViewById(R.id.emailText);
String emailValue = emailText.getText().toString();
EditText phoneNumber = (EditText)findViewById(R.id.phoneNumber);
String phoneValue = phoneNumber.getText().toString();
EditText addressText = (EditText)findViewById(R.id.addressText);
String addressValue = addressText.getText().toString();
EditText zipNumber = (EditText)findViewById(R.id.zipNumber);
String zipValue = zipNumber.getText().toString();
EditText arrivalDate = (EditText)findViewById(R.id.arrivalDate);
String arrivalValue = arrivalDate.getText().toString();
EditText departureDate = (EditText)findViewById(R.id.departureDate);
String departureValue = departureDate.getText().toString();
EditText notesArea = (EditText)findViewById(R.id.notesText);
String notesValue = notesArea.getText().toString();
EditText roomNum = (EditText)findViewById(R.id.roomNum);
String roomValue = roomNum.getText().toString();
db.insertRow(nameValue, emailValue, phoneValue, addressValue, zipValue, arrivalValue, departureValue, roomValue, notesValue);
Toast toast = Toast.makeText(getApplicationContext(), "Creating Reservation", Toast.LENGTH_LONG);
toast.show();
db.close();
}
非常感谢您的任何帮助。我试着在网上查找，这是我找到DBAdapter的地方，但当我使用这个DBAdapter时，我觉得我可能把事情搞砸了。例如，在Android Studio中，列号向我发出检查警告，该字段从未被使用。然而，它们被包含在最初的DBAdapter中。我觉得在调整DBAdapter以满足我的需求时，我可能犯了一个错误，但我似乎不知道我在哪里出了问题。我对Android编程非常陌生，以前只做过一个应用程序。任何帮助都将不胜感激
# 1 楼答案
您的创建表实际上没有创建任何表，因为它是错误的：
应该是：
请不要告诉我你不需要，也不要告诉我你不应该使用硬编码的列索引
这是因为，如果执行
SELECT * ...，没有人可以预测行内的列顺序所以，也许在一次查询中，email字段有索引2，而在另一次运行中，它有索引5
这就是为什么使用固定列索引是不好的，最好在getColumnIndex中使用列名
这段代码让我假设你要做坏事：
相反，使用
此外，不要在列名中使用空格或连字符
这个
应该是：