程序内使用sqlite数据库是通过sqliteOpenHelper进行操作 1. 自己写个类继承sqliteOpenHelper,重写以下3个方法 public void onCreate(sqliteDatabase db) {//创建数据库时的操作,如建表} public void onUpgrade(sqliteDatabase db,int oldVersion,int newVersion) { //版本更新的操作 } 2. 通过sqliteOpenHelper的getWritableDatabase()获得一个sqliteDatabase数据库,以后的操作都是对sqliteDatabase进行操作。 3. 对得到的sqliteDatabase对象进行增,改,删,查等操作。 代码 package cx.myNote; import android.content.ContentValues; import android.content.Context; import android.content.Intent; import android.database.Cursor; import android.database.sqlite.sqliteDatabase; import android.database.sqlite.sqliteOpenHelper; //DBOptions for login public class DBOptions { private static final String DB_NAME = "notes.db"; private static final String DB_CREATE="create table logininf(name text,pwd text)"; public class DBHelper extends sqliteOpenHelper { public DBHelper(Context context) { super(context,DB_NAME,null,1); } @Override public void onCreate(sqliteDatabase db) { // Todo Auto-generated method stub //建表 db.execsql(DB_CREATE); } @Override public void onUpgrade(sqliteDatabase db,int newVersion) { // Todo Auto-generated method stub db.execsql("drop table if exists logininf"); onCreate(db); } } private Context context; private sqliteDatabase db; private DBHelper dbHelper; public DBOptions(Context context) { this.context = context; dbHelper = new DBHelper(context); db=dbHelper.getReadableDatabase(); } //自己写的方法,对数据库进行操作 public String getName() { Cursor cursor = db.rawQuery("select name from logininf",null); cursor.movetoFirst(); return cursor.getString(0); } public int changePWD(String oldP,String pwd) { ContentValues values = new ContentValues(); values.put("pwd",pwd); return db.update("logininf",values,"pwd="+oldP,null); } }