Android SQLiteHelper

 1 package com.liren.news.data;
 2 
 3 import android.content.ContentValues;
 4 import android.content.Context;
 5 import android.database.Cursor;
 6 import android.database.sqlite.SQLiteDatabase;
 7 
 8 public class SQLiteHelper extends android.database.sqlite.SQLiteOpenHelper {
 9 
10     private final static String DATABASE_NAME = "db_name";
11     private final static int DATABASE_VERSION = 1;
12     private final static String TABLE_NAME = "mytable";
13     private final static String FIELD_ID = "ID";
14     private final static String FIELD_NAME = "NAME";
15 
16     public SQLiteHelper(Context context) {
17         super(context, DATABASE_NAME, null, DATABASE_VERSION);
18     }
19 
20     @Override
21     public void onCreate(SQLiteDatabase db) {
22         String sql = "Create table %s (%s integer primary key autoincrement,%s text);";
23         sql = String.format(sql, TABLE_NAME, FIELD_ID, FIELD_NAME);
24         db.execSQL(sql);
25     }
26 
27     @Override
28     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
29         String sql = "DROP TABLE IF EXISTS " + TABLE_NAME;
30         db.execSQL(sql);
31         onCreate(db);
32     }
33 
34     public Cursor select() {
35         SQLiteDatabase db = this.getReadableDatabase();
36         Cursor cursor = db.query(TABLE_NAME, null, null, null, null, null,
37                 FIELD_ID);
38         return cursor;
39 
40     }
41 
42     public long insert(String name) {
43         SQLiteDatabase db = this.getWritableDatabase();
44         ContentValues cv = new ContentValues();
45         cv.put(FIELD_NAME, name);
46         long row = db.insert(TABLE_NAME, null, cv);
47         return row;
48     }
49 
50     public void delete(int id){
51         SQLiteDatabase db = this.getWritableDatabase();
52         String where  = FIELD_ID + "= ?";
53         String[] wherevalue = {Integer.toString(id)};
54         db.delete(TABLE_NAME, where, wherevalue);
55     }
56     
57     public void update(int id,String name)
58     {
59         SQLiteDatabase db = this.getWritableDatabase();
60         String where  = FIELD_ID + "= ?";
61         String[] wherevalue = {Integer.toString(id)};
62         ContentValues cv = new ContentValues();
63         cv.put(FIELD_NAME, name);
64         db.update(TABLE_NAME, cv, where, wherevalue);
65     }    
66 }
67