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我有包含sqlite數據庫和表格的示例代碼，問題是當我嘗試添加1個表格並在我的設備中安裝應用程序時，數據庫被創建但兩個的表中，實際表和新表不會創建。我已經嘗試更改數據庫版本和名稱，但它不適用於我。這裏是我的我的數據庫處理器：在數據庫中添加表格後未創建表格
package com.AndroidDevelopmentGuru.database_new;
import java.util.ArrayList;
import java.util.List;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class DatabaseHandler extends SQLiteOpenHelper {
public DatabaseHandler(Context context, Object name,
Object factory, int version) {
// TODO Auto-generated constructor stub
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
String password;
// Database Version
private static final int DATABASE_VERSION = 5;
// Database Name
private static final String DATABASE_NAME = "User.db";
// Contacts table name
private static final String TABLE_REGISTER= "register";
public static final String KEY_ID = "id";
public static final String KEY_FIRST_NAME = " first_name";
public static final String KEY_lAST_NAME = "last_name";
public static final String KEY_EMAIL_ID="email_id";
public static final String KEY_MOB_NO = "mobile_number";
public static final String KEY_PASSWORD = "password";
public static final String CREATE_TABLE="CREATE TABLE " + TABLE_REGISTER + "("
+ KEY_ID + " INTEGER PRIMARY KEY," + KEY_FIRST_NAME + " TEXT,"+KEY_lAST_NAME + " TEXT,"+KEY_EMAIL_ID+ " TEXT,"
+ KEY_MOB_NO + " TEXT," + KEY_PASSWORD + " TEXT " + ")";
private static final String TABLE_CAR = "car";
public static final String KEY_CAR_ID = "car_id";
public static final String KEY_CAR_NAME = "car_name";
public static final String KEY_CAR_PRICE = "car_price";
public static final String KEY_CAR_DESCP = "car_descp";
public static final String CREATE_TABLE_CAR = "CREATE TABLE " + TABLE_CAR + "("
+ KEY_CAR_ID + "INTEGER PRIMARY KEY,"
+ KEY_CAR_NAME + "TEXT,"
+ KEY_CAR_PRICE + "INTEGER,"
+ KEY_CAR_DESCP + "TEXT," + ")";
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL(CREATE_TABLE);
db.execSQL(CREATE_TABLE_CAR);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_REGISTER);
db.execSQL("DROP TABLE IF EXISTS " + TABLE_CAR);
// Create tables again
onCreate(db);
}
void addregister(Registerdata registerdata)
// code to add the new register
{
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_FIRST_NAME,registerdata.getfirstName()); // register first Name
values.put(KEY_lAST_NAME, registerdata. getlastName()); // register last name
values.put(KEY_EMAIL_ID, registerdata.getEmailId());//register email id
values.put(KEY_MOB_NO, registerdata.getMobNo());//register mobile no
values.put(KEY_PASSWORD, registerdata.getPassword());
// Inserting Row
db.insert(TABLE_REGISTER, null, values);
db.close(); // Closing database connection
}
//code to get the register
String getregister(String username){
SQLiteDatabase db = this.getReadableDatabase();
//String selectquery="SELECT * FROM TABLE_REGISTER";
Cursor cursor=db.query(TABLE_REGISTER,null, "email_id=?",new String[]{username},null, null, null, null);
if(cursor.getCount()<1){
cursor.close();
return "Not Exist";
}
else if(cursor.getCount()>=1 && cursor.moveToFirst()){
password = cursor.getString(cursor.getColumnIndex(KEY_PASSWORD));
cursor.close();
}
return password;
}
/*public String getDatabaseName() {
return DATABASE_NAME;
}
public static String getKeyId() {
return KEY_ID;
}
public static String getTableContacts() {
return TABLE_REGISTER;
}
public static int getDatabaseVersion() {
return DATABASE_VERSION;
}*/
}