我创建了 2 个表，第一个表工作正常，但第二个表在插入日志中显示的错误时不工作 cat no such table 我想知道为什么没有创建联系人表
public class DBAdapter {
public static final String KEY_USERNAME="username";
public static final String KEY_PASSWORD="password";
public static final String KEY_ID="id";
public static final String KEY_NAME="name";
public static final String KEY_PHONE="phone";
public static final String KEY_EMAIL="e_mail";
public static final String TABLE_USERS="users";
public static final String TABLE_CONTACTS="contacts";
public static final String DATABASE_NAME="project1";
public static final int DATABSE_VERSION=1;
/////////////////////////////////////////////////
public String KEY_NAME()
{
return KEY_NAME;
}
public String KEY_PHONE()
{
return KEY_PHONE;
}
public String KEY_EMAIL()
{
return KEY_EMAIL;
}
/////////////////////////////////////////////////
private Context c;
private SQLiteDatabase db;
private DBHelper helper;
/////////////////////////////////////////////////
public DBAdapter(Context ctx) {
// TODO Auto-generated constructor stub
c=ctx;
helper=new DBHelper(c);
}
/////////////////////////////////////////////////
private static class DBHelper extends SQLiteOpenHelper
{
public DBHelper(Context context) {
super(context, DATABASE_NAME, null, DATABSE_VERSION);
// TODO Auto-generated constructor stub
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
try{
db.execSQL("create table if not exists
"+TABLE_USERS+" ("+KEY_USERNAME+" text primary key,"+KEY_PASSWORD+"
text not null);");
db.execSQL("create table if not exists "+TABLE_CONTACTS+"("+KEY_ID+"
integer autoincrement primary key,"+KEY_NAME+" text not
null,"+KEY_PHONE+" integer not null,"+KEY_EMAIL+" text
,"+KEY_USERNAME+" text not null foriegn key);");
}
catch (SQLException e) {
// TODO: handle exception
Log.e(TABLE_USERS, "table is not created");
}
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion,
int newVersion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS "+TABLE_USERS);
db.execSQL("DROP TABLE IF EXISTS "+TABLE_CONTACTS);
onCreate(db);
}
}
/////////////////////////////////////////////////////
public void open()
{
try{
db=helper.getWritableDatabase();
}
catch (SQLiteException e) {
// TODO: handle exception
}
}
/////////////////////////////////////////////////////
public void close()
{
helper.close();
}
////////////////////////////////////////////////////
public long register_user(String uname,String pass)
{
ContentValues values=new ContentValues();
values.put(KEY_USERNAME, uname);
values.put(KEY_PASSWORD, pass);
return db.insert(TABLE_USERS, null, values);
}
////////////////////////////////////////////////////
public boolean login(String uname,String pass)
{
Cursor c=db.rawQuery("select * from "+TABLE_USERS+" where
"+KEY_USERNAME+"= ?",new String[]{uname});
if(c.moveToFirst())
{
if(c.getString(c.getColumnIndex(KEY_PASSWORD)).equals(pass))
{
return true;
}
else
return false;
}
else
{
return false;
}
}
////////////////////////////////////////////////////
public long addcontact(String name,String phone,String email,String user)
{
ContentValues value=new ContentValues();
value.put(KEY_NAME, name);
value.put(KEY_PHONE, phone);
value.put(KEY_EMAIL, email);
value.put(KEY_USERNAME, user);
return db.insert(TABLE_CONTACTS, null, value);
}
////////////////////////////////////////////////////
/* public long addcontact(String name,String phone,String user)
{
ContentValues value=new ContentValues();
value.put(KEY_NAME, name);
value.put(KEY_PHONE, phone);
value.put(KEY_USERNAME, user);
return db.insert(TABLE_CONTACTS, null, value);
}*/
////////////////////////////////////////////////////
public Cursor show_all_contacts(String user)
{
Cursor c=db.rawQuery("select * from "+TABLE_CONTACTS+" where
"+KEY_USERNAME+"= ?", new String[]{user});
return c;
}
////////////////////////////////////////////////////
}