问题
I'm new with database (SQLite) and I'm trying to do a multi-table database in android. Each table has the same rows (id, name , ph_number). Every tables store a "contact" object.
When I want to store a contact in one table with the method addContactDatos(Contact contact, int partido), it's stored in every tables not just in the one I want. How can I solve it?
This is the Handler:
public class DatabaseHandler extends SQLiteOpenHelper {
// Database Version
private static final int DATABASE_VERSION = 1;
// Database Name
private static final String DATABASE_NAME = "contactsManager";
// Contacts Tables names
private static final String TABLE_PRIMERO = "contacts";
private static final String TABLE_SEGUNDO = "contacts";
private static final String TABLE_TERCERO = "contacts";
private static final String TABLE_CUARTO = "contacts";
// Contacts Table Columns names
private static final String KEY_ID = "id";
private static final String KEY_NAME = "name";
private static final String KEY_PH_NO = "phone_number";
int oldVersion=1;
public DatabaseHandler(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
// Creating Tables
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_CONTACTS_TABLE1 = "CREATE TABLE_PRIMERO " + TABLE_PRIMERO + "("
+ KEY_ID + " INTEGER PRIMARY KEY," + KEY_NAME + " TEXT,"
+ KEY_PH_NO + " TEXT" + ")";
db.execSQL(CREATE_CONTACTS_TABLE1);
String CREATE_CONTACTS_TABLE2 = "CREATE TABLE_SEGUNDO " + TABLE_SEGUNDO + "("
+ KEY_ID + " INTEGER PRIMARY KEY," + KEY_NAME + " TEXT,"
+ KEY_PH_NO + " TEXT" + ")";
db.execSQL(CREATE_CONTACTS_TABLE2);
String CREATE_CONTACTS_TABLE3 = "CREATE TABLE_TERCERO " + TABLE_TERCERO + "("
+ KEY_ID + " INTEGER PRIMARY KEY," + KEY_NAME + " TEXT,"
+ KEY_PH_NO + " TEXT" + ")";
db.execSQL(CREATE_CONTACTS_TABLE3);
String CREATE_CONTACTS_TABLE4 = "CREATE TABLE_CUARTO " + TABLE_CUARTO + "("
+ KEY_ID + " INTEGER PRIMARY KEY," + KEY_NAME + " TEXT,"
+ KEY_PH_NO + " TEXT" + ")";
db.execSQL(CREATE_CONTACTS_TABLE4);
}
// Upgrading database
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS " + TABLE_PRIMERO);
db.execSQL("DROP TABLE IF EXISTS " + TABLE_SEGUNDO);
db.execSQL("DROP TABLE IF EXISTS " + TABLE_TERCERO);
db.execSQL("DROP TABLE IF EXISTS " + TABLE_CUARTO);
// Create tables again
onCreate(db);
}
public void addContactDatos(Contact contact, int partido) {
SQLiteDatabase db = this.getWritableDatabase();
// Inserting Row
if (partido == 1) {
ContentValues values = new ContentValues();
values.put(KEY_NAME, contact.getName()); // Contact Name
values.put(KEY_PH_NO, contact.getPhoneNumber()); // Contact Phone Number
db.insert(TABLE_PRIMERO, null, values);
db.close(); // Closing database connection
Log.d("Entra","MAL");
}
// Inserting Row
if (partido == 2) {
ContentValues values = new ContentValues();
values.put(KEY_NAME, contact.getName()); // Contact Name
values.put(KEY_PH_NO, contact.getPhoneNumber()); // Contact Phone Number
db.insert(TABLE_SEGUNDO, null, values);
db.close(); // Closing database connection
Log.d("Entra","2");
}
// Inserting Row
if (partido == 3) {
ContentValues values = new ContentValues();
values.put(KEY_NAME, contact.getName()); // Contact Name
values.put(KEY_PH_NO, contact.getPhoneNumber()); // Contact Phone Number
db.insert(TABLE_TERCERO, null, values);
db.close(); // Closing database connection
Log.d("Entra","MAL");
}
// Inserting Row
if (partido == 4) {
ContentValues values = new ContentValues();
values.put(KEY_NAME, contact.getName()); // Contact Name
values.put(KEY_PH_NO, contact.getPhoneNumber()); // Contact Phone Number
db.insert(TABLE_CUARTO, null, values);
db.close(); // Closing database connection
Log.d("Entra","MAL");
}
}
// Getting All Contacts
public List<Contact> getAllContacts(int partido) {
List<Contact> contactList = new ArrayList<Contact>();
String selectQuery="";
// Select All Query
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
switch (partido){
case 1:
selectQuery = "SELECT * FROM " + TABLE_PRIMERO;
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
Contact contact = new Contact();
contact.setID(Integer.parseInt(cursor.getString(0)));
contact.setName(cursor.getString(1));
contact.setPhoneNumber(cursor.getString(2));
// Adding contact to list
contactList.add(contact);
} while (cursor.moveToNext());
}
break;
case 2:
selectQuery = "SELECT * FROM " + TABLE_SEGUNDO;
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
Contact contact = new Contact();
contact.setID(Integer.parseInt(cursor.getString(0)));
contact.setName(cursor.getString(1));
contact.setPhoneNumber(cursor.getString(2));
// Adding contact to list
contactList.add(contact);
} while (cursor.moveToNext());
}
break;
case 3:
selectQuery = "SELECT * FROM " + TABLE_TERCERO;
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
Contact contact = new Contact();
contact.setID(Integer.parseInt(cursor.getString(0)));
contact.setName(cursor.getString(1));
contact.setPhoneNumber(cursor.getString(2));
// Adding contact to list
contactList.add(contact);
} while (cursor.moveToNext());
}
break;
case 4:
selectQuery = "SELECT * FROM " + TABLE_CUARTO;
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
Contact contact = new Contact();
contact.setID(Integer.parseInt(cursor.getString(0)));
contact.setName(cursor.getString(1));
contact.setPhoneNumber(cursor.getString(2));
// Adding contact to list
contactList.add(contact);
} while (cursor.moveToNext());
}
break;
}
// return contact list
return contactList;
}
public void deleteDB() {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_PRIMERO, null, null);
db.delete(TABLE_SEGUNDO, null, null);
db.delete(TABLE_TERCERO, null, null);
db.delete(TABLE_CUARTO, null, null);
}
And this is the object model contact: public class Contact {
//private variables
int _id;
String _name;
String _phone_number;
// Empty constructor
public Contact(){
}
// constructor
public Contact(int id, String name, String _phone_number){
this._id = id;
this._name = name;
this._phone_number = _phone_number;
}
// constructor
public Contact(String name, String _phone_number){
this._name = name;
this._phone_number = _phone_number;
}
// getting ID
public int getID(){
return this._id;
}
// setting id
public void setID(int id){
this._id = id;
}
// getting name
public String getName(){
return this._name;
}
// setting name
public void setName(String name){
this._name = name;
}
// getting phone number
public String getPhoneNumber(){
return this._phone_number;
}
// setting phone number
public void setPhoneNumber(String phone_number){
this._phone_number = phone_number;
}
}
Is ther any way to do wat I want . I would really appreciate a little help. Thank you very much.
回答1:
You MUST use DIFFERENT TABLE NAMES!!
i.e.:
// Contacts Tables names
private static final String TABLE_PRIMERO = "contacts_1";
private static final String TABLE_SEGUNDO = "contacts_2";
private static final String TABLE_TERCERO = "contacts_3";
private static final String TABLE_CUARTO = "contacts_4";
Otherwise, you are always working on the same table (the only one you create), named "contacts"
回答2:
All your table names are the same one
private static final String TABLE_PRIMERO = "contacts";
private static final String TABLE_SEGUNDO = "contacts";
private static final String TABLE_TERCERO = "contacts";
private static final String TABLE_CUARTO = "contacts";
here you don't have multi-table you just one table named contacts
change table name
private static final String TABLE_PRIMERO = "contacts_primero";
private static final String TABLE_SEGUNDO = "contacts_segundo";
private static final String TABLE_TERCERO = "contacts_tercero";
private static final String TABLE_CUARTO = "contacts_cuarto";
来源：https://stackoverflow.com/questions/21779772/multi-table-database-sqlite-android