我如何檢查數據庫是否有數據並在sqlite中插入新行android

我正在從android應用程序中將數據從json保存到sqlite數據庫中數據保存但是如果用戶再次登錄將再次插入相同的數據在數據庫中的新行我如何檢查數據庫是否有數據並在sqlite中插入新行android

768,16我做些什麼來阻止插入相同的數據，每次登錄，如果有新的數據保存它只

我嘗試addCustomer添加此代碼，但它只能保存一行

Cursor cur = db.rawQuery("SELECT count(*) FROM " + BookingTabel.TABLE_CUSTOMER, null); 
if (cur != null && cur.moveToFirst() && cur.getInt(0) > 0) { 

    Log.i(getClass().getName(), "table not empty"); 
} 
else { 

    Log.i(getClass().getName(), "table is empty"); 
    customer_id = db.insert(TABLE_CUSTOMER, null, values); 
}

這是我的SqlitleHelper

public class BookingTabel extends SQLiteOpenHelper { 

    private static final int DB_VERSION = 1; 

    private static final String DB_NAME = "MyDB"; 

    // Bookinks table name 

    private static final String TABLE_BOOKINDS = "bookings"; 
    private static final String TABLE_CUSTOMER = "customer"; 
    private static final String TABLE_SERVICE = "service"; 
    private static final String TABLE_SERVICE_ATTRIBUTE = "service_attribute"; 
    private static final String TABLE_SERVICE_ATTRIBUTE_VALUE = "service_attribute_value"; 
    private static final String TABLE_INVOICE = "invoice"; 
    private static final String TABLE_ESTIMATE = "estimate"; 

    // Bookings Table Columns names 
    private static final String KEY_ID = "id"; 
    private static final String KEY_BOOKING_ID = "booking_id"; 
    private static final String KEY_BOOKING_NUM = "booking_num"; 
    private static final String KEY_TITLE = "title"; 
    private static final String KEY_BOOKING_START= "booking_start"; 
    private static final String KEY_BOOKING_END = "booking_end"; 
    private static final String KEY_PROPERTY = "property_type"; 
    private static final String KEY_DESCRIPTION = "description"; 
    private static final String KEY_ACCEPT_STATUS = "accept_status"; 
    private static final String KEY_BOOKING_ADDRESS = "booking_address"; 
    private static final String KEY_PO_BOX = "po_box"; 
    private static final String KEY_CREATED = "created"; 
    private static final String KEY_POSTCODE = "postcode"; 
    private static final String KEY_STATE = "state"; 
    private static final String KEY_STREET_ADDRESS = "street_address"; 
    private static final String KEY_STREET_NUMBER = "street_number"; 
    private static final String KEY_SUBURB = "suburb"; 
    private static final String KEY_UNIT_LOT_NUMBER = "unit_lot_number"; 
    private static final String KEY_STATUS = "status"; 
    private static final String KEY_CONVERT_STATUS = "convert_status"; 
    private static final String KEY_QOUTE = "qoute"; 
    private static final String KEY_SUB_TOTAL = "sub_total"; 
    private static final String KEY_TOTAL_DISCOUNT = "total_discount"; 
    private static final String KEY_BOOKING_DISTANCE = "booking_distance"; 
    private static final String KEY_GST = "gst"; 
    private static final String KEY_ORIGINAL_BOOKING_ID = "original_booking_id"; 

    //*************** Customer Table Columns names *****************// 
    private static final String KEY_CUSTOMER_ID = "customer_id"; 
    private static final String KEY_CUSTOMER_NAME = "name"; 
    private static final String KEY_CUSTOMER_EMAIL1 = "email1"; 
    private static final String KEY_CUSTOMER_EMAIL2 = "email2"; 
    private static final String KEY_CUSTOMER_EMAIL3 = "email3"; 
    private static final String KEY_CUSTOMER_MOBILE1 = "mobile1"; 
    private static final String KEY_CUSTOMER_MOBILE2 = "mobile2"; 
    private static final String KEY_CUSTOMER_MOBILE3 = "mobile3"; 
    private static final String KEY_CUSTOMER_PHONE1 = "phone1"; 
    private static final String KEY_CUSTOMER_PHONE2 = "phone2"; 
    private static final String KEY_CUSTOMER_PHONE3 = "phone3"; 
    private static final String KEY_CUSTOMER_CITY = "city"; 
    private static final String KEY_CUSTOMER_COUNTRY = "country"; 
    private static final String KEY_CUSTOMER_ADDRESS = "address"; 
    private static final String KEY_CUSTOMER_FAX = "fax"; 
    private static final String KEY_CUSTOMER_ORIGINAL_CUSTOMER_ID = "original_customer_id"; 


    public BookingTabel(Context context) { 

     super(context, DB_NAME, null,DB_VERSION); 
     // TODO Auto-generated constructor stub 
    } 
    private static final String[] COLUMNS = {KEY_ID,KEY_BOOKING_NUM,KEY_TITLE,KEY_BOOKING_START,KEY_BOOKING_END,KEY_PROPERTY, KEY_CUSTOMER_ID,KEY_DESCRIPTION,KEY_ACCEPT_STATUS,KEY_BOOKING_ADDRESS,KEY_PO_BOX,KEY_CREATED , KEY_POSTCODE,KEY_STATE,KEY_STREET_ADDRESS,KEY_STREET_NUMBER,KEY_SUBURB,KEY_UNIT_LOT_NUMBER,KEY_STATUS, KEY_CONVERT_STATUS,KEY_QOUTE,KEY_SUB_TOTAL,KEY_TOTAL_DISCOUNT,KEY_BOOKING_DISTANCE,KEY_GST, KEY_ORIGINAL_BOOKING_ID}; 

    @Override 
    public void onCreate(SQLiteDatabase db) { 

     // TODO Auto-generated method stub 
     // SQL statement to create book table 
     String CREATE_BOOKINDS_TABLE = "CREATE TABLE bookings (" + "id INTEGER PRIMARY KEY ,"+ "booking_num VARCHAR(250) ,"+ "title VARCHAR(250) ," + "booking_start DATETIME ,"+"booking_end DATETIME ,"+"property_type VARCHAR(250) NOT NULL DEFAULT 'House'," + "customer_id LONG ,"+"description TEXT ,"+"accept_status VARCHAR(250) ,"+"booking_address VARCHAR(250), " + "po_box VARCHAR(250) , "+ "created INTEGER ,"+ "postcode INTEGER ,"+"state VARCHAR(250) ," + "street_address VARCHAR(250) ,"+"street_number INTEGER ,"+"suburb VARCHAR(250) ,"+"unit_lot_number INTEGER ," + "status VARCHAR(250) ,"+"convert_status VARCHAR(250) ,"+"qoute FLOAT ,"+"sub_total FLOAT ,"+"total_discount FLOAT ," + "booking_distance FLOAT ,"+"gst FLOAT ,"+"original_booking_id INTEGER)"; 


     String CREATE_TABLE_CUSTOMER = "CREATE TABLE customer ("+ "id INTEGER PRIMARY KEY,"+ "name VARCHAR(250),"+ "email1 VARCHAR(250)," + "email2 VARCHAR(250) ," + "email3 VARCHAR(250) , " + "mobile1 VARCHAR(250), " + "mobile2 VARCHAR(250), " + "mobile3 VARCHAR(250)," + "phone1 VARCHAR(250)," + "phone2 VARCHAR(250)," + "phone3 VARCHAR(250)," + "city VARCHAR(250)," + "country VARCHAR(250)," + "address VARCHAR(250)," + "fax VARCHAR9(250)," + "original_customer_id INTEGER)"; 

     // create bookings table 

     db.execSQL(CREATE_BOOKINDS_TABLE); 
     db.execSQL(CREATE_TABLE_CUSTOMER); 
    } 

    @Override 
    public void onUpgrade(SQLiteDatabase db, int arg1, int arg2) { 

     // TODO Auto-generated method stub 
     db.execSQL("DROP TABLE IF EXISTS bookings"); 
     // create fresh bookings table 
     this.onCreate(db); 
    } 

    public long addCustomer(String name,String email1,String email2, String email3, String mobile1,String mobile2,String mobile3,String phone1,String phone2,String phone3,String city,String country,String address ,String fax,String original_customer_id/*,String original_booking_id*/) { 


     // TODO Auto-generated method stub 
     SQLiteDatabase db = this.getWritableDatabase(); 

     ContentValues values = new ContentValues(); 
     values.put(KEY_CUSTOMER_NAME,name); 
     values.put(KEY_CUSTOMER_EMAIL1 ,email1); 
     values.put(KEY_CUSTOMER_EMAIL2 ,email2); 
     values.put(KEY_CUSTOMER_EMAIL3 ,email3 ); 
     values.put(KEY_CUSTOMER_MOBILE1 ,mobile1); 
     values.put(KEY_CUSTOMER_MOBILE2,mobile2); 
     values.put(KEY_CUSTOMER_MOBILE3,mobile3); 
     values.put(KEY_CUSTOMER_PHONE1,phone1); 
     values.put(KEY_CUSTOMER_PHONE2,phone2); 
     values.put(KEY_CUSTOMER_PHONE3,phone3); 
     values.put(KEY_CUSTOMER_CITY,city); 
     values.put(KEY_CUSTOMER_COUNTRY,country); 
     values.put(KEY_CUSTOMER_ADDRESS,address); 
     values.put(KEY_CUSTOMER_FAX,fax); 
     values.put(KEY_CUSTOMER_ORIGINAL_CUSTOMER_ID,original_customer_id); 
     //values.put(KEY_ORIGINAL_BOOKING_ID, original_booking_id); 

     long customer_id = db.insert(TABLE_CUSTOMER, null, values); 
     db.close(); 

     return customer_id ; 
    } 

    //*************** ADD Bookings In Database *****************// 

    public long addBookings(String booking_num,String title,String booking_start,String booking_end,String property_type,long customer_id,String description,String accept_status,String booking_address,String po_box,String created ,String postcode,String state,String street_address,String street_number,String suburb,String unit_lot_number,String status,String convert_status,String qoute,String sub_total,String total_discount,String booking_distance,String gst, String original_booking_id) { 

     // TODO Auto-generated method stub 
     SQLiteDatabase db = this.getWritableDatabase(); 

     ContentValues values = new ContentValues(); 
     values.put(KEY_BOOKING_NUM,booking_num); 
     values.put(KEY_TITLE,title); 
     values.put(KEY_BOOKING_START ,booking_start); 
     values.put(KEY_BOOKING_END ,booking_end); 
     values.put(KEY_PROPERTY ,property_type ); 
     values.put(KEY_CUSTOMER_ID, customer_id); 
     // System.out.println("CUSTOMER ID:*****" + customer_id); 
     values.put(KEY_DESCRIPTION,description ); 
     values.put(KEY_ACCEPT_STATUS,accept_status ); 
     values.put(KEY_BOOKING_ADDRESS,booking_address); 
     values.put(KEY_PO_BOX,po_box); 
     values.put(KEY_CREATED,created ); 
     values.put(KEY_POSTCODE,postcode); 
     values.put(KEY_STATE,state); 
     values.put(KEY_STREET_ADDRESS,street_address); 
     values.put(KEY_STREET_NUMBER,street_number); 
     values.put(KEY_SUBURB,suburb); 
     values.put(KEY_UNIT_LOT_NUMBER,unit_lot_number); 
     values.put(KEY_STATUS,status); 
     values.put(KEY_CONVERT_STATUS,convert_status); 
     values.put(KEY_QOUTE,qoute); 
     values.put(KEY_SUB_TOTAL,sub_total); 
     values.put(KEY_TOTAL_DISCOUNT,total_discount); 
     values.put(KEY_BOOKING_DISTANCE,booking_distance); 
     values.put(KEY_GST,gst); 
     values.put(KEY_ORIGINAL_BOOKING_ID,original_booking_id); 

     long booking_id = db.insert(TABLE_BOOKINDS, null, values); 
     db.close(); 
     return booking_id; 
    }

來源

2014-11-25 user3661581

你必須把這個環路 – 2014-11-25 09:00:01

是的，我把它放在循環對（INT I = 0;我 user3661581 2014-11-25 09:07:51

然後你必須檢查它，它是唯一的價值。 – 2014-11-25 09:15:27

-1

如果數據存在於數據庫中，則此代碼將起作用。現在，你將不得不改變我用來檢查任何獨特的價值，你在你的數據庫中存儲，當用戶登錄查詢

public static boolean CheckIsDataAlreadyInDBorNot(String TableName, 
     String dbfield, String fieldValue) { 
    SQLiteDatabase sqldb = EGLifeStyleApplication.sqLiteDatabase; 
    String Query = "Select * from " + TableName + " where " + dbfield + "=" 
      + fieldValue; 
    Cursor cursor = sqldb.rawQuery(Query, null); 
      if(cursor.getCount<=0){ 
    return false; 
      } 
     return true; 
}

Source

來源

2014-11-25 09:07:41 Darpan

添加downvote應該伴隨着評論提及原因，以便將來可以改進他們的答案。 – Darpan 2014-11-25 09:57:21

考慮SQLite中使用INSERT OR IGNORE：

在customer表中創建一個唯一字段，例如name VARCHAR(250) UNIQUE
用戶execSQL方法使INSERT OR IGNORE查詢

指sqlite - How to get INSERT OR IGNORE to work

來源

2014-11-25 09:18:07 debi

我如何檢查數據庫是否有數據並在sqlite中插入新行android

回答

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