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こんにちは、私はこれらの2つに苦しんでいます。 i）私はアンドロイドアプリのsqliteデータベースを作成しました。メインアクティビティから行を追加しました。今、私がプログラムを実行しているときはいつでも、同じ行がデータベースに追加されます。どのようにこれらのすべての行でデータベースが作成されるのを確実にするか。 ii）プライマリキーとしてid（int型）を作成し、自動インクリメントしました。プライマリIDを自動インクリメンタルにする必要はなく、各行に対して手動で設定することができます。私はそれをどのようにすることができますか？私は、テーブルを作成するためにデータを渡すsqliteでアンドロイドプログラムを実行すると重複行を防ぐ方法
1. All database related functions have been in this code:
public class DataBaseHandlerActivity extends SQLiteOpenHelper {
// Database Version
private static final int DATABASE_VERSION = 1;
// Database Name
private static final String DATABASE_NAME = "shopsManager";
// Shop table name
private static final String TABLE_SHOPS = "shops";
// Shop Table Columns names
private static final String KEY_ID = "shopid";
private static final String KEY_NAME = "shopname";
private static final String KEY_ADDRESS = "shopaddress";
private static final String KEY_CAT1="category1";
private static final String KEY_CAT2="category2";
private static final String KEY_CAT3="category3";
private static final String KEY_CAT4="category4";
private static final String KEY_IMAGE="shopimage";
public DataBaseHandlerActivity(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
// Creating Tables
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_SHOPS_TABLE="CREATE TABLE "+TABLE_SHOPS+"("+KEY_ID+" INTEGER PRIMARY KEY,"+KEY_NAME+" TEXT,"+
KEY_IMAGE+" TEXT,"+
KEY_ADDRESS+" TEXT,"+KEY_CAT1+" TEXT,"+KEY_CAT2+" TEXT,"+KEY_CAT3+" TEXT,"+KEY_CAT4+" TEXT"+
")";
db.execSQL(CREATE_SHOPS_TABLE);
}
// Upgrading database
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// Drop older table if existed
db.execSQL("DROP TABLE IF EXISTS"+TABLE_SHOPS);
//CREATE TABLE AGAIN
onCreate(db);
}
/**
* All CRUD(Create, Read, Update, Delete) Operations
*/
//Add a new shop row
void addShop(Shop shop){
SQLiteDatabase db=this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME,shop.getShopName());
values.put(KEY_IMAGE,shop.getShopImage());
values.put(KEY_ADDRESS,shop.getShopAddress());
values.put(KEY_CAT1,shop.getShopCat1());
values.put(KEY_CAT2,shop.getShopCat2());
values.put(KEY_CAT3,shop.getShopCat3());
values.put(KEY_CAT4,shop.getShopCat4());
//Inserting row
db.insert(TABLE_SHOPS,null,values);
db.close(); //Close db connection
}
//Get a shop items corresponding to a primary key
Shop getShop(int id){
SQLiteDatabase db=this.getReadableDatabase();
Cursor cursor=db.query(TABLE_SHOPS,new String[]{KEY_ID,KEY_NAME,KEY_IMAGE,KEY_ADDRESS,KEY_CAT1,KEY_CAT2,KEY_CAT3,KEY_CAT4},
KEY_ID +"=?",new String[] { String.valueOf(id) }, null, null, null, null);
if (cursor != null)
cursor.moveToFirst();
Shop shop = new Shop(Integer.parseInt(cursor.getString(0)),
cursor.getString(1), cursor.getString(2),cursor.getString(3),cursor.getString(4),cursor.getString(5),
cursor.getString(6),cursor.getString(7));
// return shop
return shop;
}
// Getting All Shops
public List<Shop> getAllShops() {
List<Shop> shopList = new ArrayList<Shop>();
// Select All Query
String selectQuery = "SELECT * FROM " + TABLE_SHOPS;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
// looping through all rows and adding to list
if (cursor.moveToFirst()) {
do {
Shop shop = new Shop();
shop.setShopId(Integer.parseInt(cursor.getString(0)));
shop.setShopName(cursor.getString(1));
shop.setShopImage(cursor.getString(2));
shop.setShopAddress(cursor.getString(3));
shop.setShopCat1(cursor.getString(4));
shop.setShopCat2(cursor.getString(5));
shop.setShopCat3(cursor.getString(6));
shop.setShopCat4(cursor.getString(7));
// Adding contact to list
shopList.add(shop);
} while (cursor.moveToNext());
}
// return shop list
return shopList;
}
// Updating single shop
public int updateShop(Shop shop) {
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME,shop.getShopName());
values.put(KEY_IMAGE,shop.getShopImage());
values.put(KEY_ADDRESS,shop.getShopAddress());
values.put(KEY_CAT1,shop.getShopCat1());
values.put(KEY_CAT2,shop.getShopCat2());
values.put(KEY_CAT3,shop.getShopCat3());
values.put(KEY_CAT4,shop.getShopCat4());
// updating row
return db.update(TABLE_SHOPS, values, KEY_ID + " = ?",
new String[] { String.valueOf(shop.getShopId()) });
}
// Deleting single shop
public void deleteShop(Shop shop) {
SQLiteDatabase db = this.getWritableDatabase();
db.delete(TABLE_SHOPS, KEY_ID + " = ?",
new String[] { String.valueOf(shop.getShopId()) });
db.close();
}
// Getting shops Count
public int getShopsCount() {
String countQuery = "SELECT * FROM " + TABLE_SHOPS;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(countQuery, null);
int count=cursor.getCount();
cursor.close();
db.close() ;
// return count
return count;
}
}
2.主な活動：
package com.trillbit.databaseactivity;
import android.database.sqlite.SQLiteDatabase;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import java.util.List;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
DataBaseHandlerActivity db=new DataBaseHandlerActivity(this);
/**
* CRUD Operations
* */
// Inserting Shops
Log.d("Insert: ", "Inserting ..");
db.addShop(new Shop("Shoppers Stop","shopperstop","1st Floor,Forum Mall","Fashion","Clothes","Home","Shoes"));
db.addShop(new Shop("LifeStyle", "lifestyle", "2nd Floor, Forum Mall", "Fashion", "Clothes","Home", "Mobile"));
db.addShop(new Shop("Ezone", "ezone","3rd Floor, Forum Mall","Mobile","Electronics","Apppliances","Home"));
db.addShop(new Shop("Dominos", "dominos","1st Floor,Forum Mall","Food","Pizza","Cake","Pastery"));
// Reading all shops
Log.d("Reading: ", "Reading all shops..");
List<Shop> shops = db.getAllShops();
for (Shop shop : shops) {
String log = "Id: " + shop.getShopId() + " ,Name: " + shop.getShopName() + " ,Image: " + shop.getShopImage()
+ ",Address: " + shop.getShopAddress() + ",Categort1: " + shop.getShopCat1() + ", Category2: " + shop.getShopCat2()
+ ",Category3: " + shop.getShopCat3() + ",Catgeory4: " + shop.getShopCat4();
// Writing Shops to log
Log.d("Name: ", log);
}
}
}
3.Output logcatで：
D/Name:: Id: 5 ,Name: Shoppers Stop ,Image: shopperstop,Address: 1st Floor,Forunm Mall,Categort1: Fashion, Category2: Clothes,Category3: Home,Catgeory4: Shoes
01-14 16:07:49.687 7993-7993/com.trillbit.databaseactivity D/Name:: Id: 6 ,Name: LifeStyle ,Image: lifestyle,Address: 2nd Floor, Forum Mall,Categort1: Fashion, Category2: Clothes,Category3: Home,Catgeory4: Mobile
01-14 16:07:49.687 7993-7993/com.trillbit.databaseactivity D/Name:: Id: 7 ,Name: Ezone ,Image: ezone,Address: 3rd Floor, Forum Mall,Categort1: Mobile, Category2: Electronics,Category3: Apppliances,Catgeory4: Home
01-14 16:07:49.687 7993-7993/com.trillbit.databaseactivity D/Name:: Id: 8 ,Name: Dominos ,Image: dominos,Address: 1st Floor,Forum Mall,Categort1: Food, Category2: Pizza,Category3: Cake,Catgeory4: Pastery
01-14 16:07:49.687 7993-7993/com.trillbit.databaseactivity D/Name:: Id: 9 ,Name: Shoppers Stop ,Image: shopperstop,Address: 1st Floor,Forum Mall,Categort1: Fashion, Category2: Clothes,Category3: Home,Catgeory4: Shoes
01-14 16:07:49.687 7993-7993/com.trillbit.databaseactivity D/Name:: Id: 10 ,Name: LifeStyle ,Image: lifestyle,Address: 2nd Floor, Forum Mall,Categort1: Fashion, Category2: Clothes,Category3: Home,Catgeory4: Mobile
01-14 16:07:49.687 7993-7993/com.trillbit.databaseactivity D/Name:: Id: 11 ,Name: Ezone ,Image: ezone,Address: 3rd Floor, Forum Mall,Categort1: Mobile, Category2: Electronics,Category3: Apppliances,Catgeory4: Home
01-14 16:07:49.687 7993-7993/com.trillbit.databaseactivity D/Name:: Id: 12 ,Name: Dominos ,Image: dominos,Address: 1st Floor,Forum Mall,Categort1: Food, Category2: Pizza,Category3: Cake,Catgeory4: Pastery
[どのように私は一度だけアプリケーションごとに起動し、何かを実行することができますか？]の可能な重複（http://stackoverflow.com/questions/7360846/how-can-i-execute-something-just-once-per -Application-Start） –