SQLiteDatabase

public class MyHelper extends SQLiteOpenHelper {

public MyHelper(Context context, String name, CursorFactory factory,
int version) {
super(context, name, factory, version);

}

@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL("create table account(id integer primary key autoincrement,name varchar(20),acc varchar(20),money float)");

}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

}

}

public class MainActivity extends Activity {

private SQLiteDatabase sql;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sql = new MyHelper(this, "accountData", null, 1).getReadableDatabase();

ContentValues cv1 = new ContentValues();
cv1.put("name", "哈登");
cv1.put("acc", "123123123123123");
cv1.put("money", "1000.00f");
sql.insert("account", null, cv1);

ContentValues cv2 = new ContentValues();
cv2.put("name", "霍华德");
cv2.put("acc", "456456456456456");
cv2.put("money", "2000.00f");
sql.insert("account", null, cv2);
// 开启事务
sql.beginTransaction();
ContentValues from = new ContentValues();
from.put("money", "800.00f");
sql.update("account", from, "acc=?", new String[] { "123123123123123" });
ContentValues to = new ContentValues();
to.put("money", "2200.00f");
sql.update("account", to, "acc=?", new String[] { "456456456456456" });
sql.setTransactionSuccessful();
sql.endTransaction();
}

}
//查询
cursor = sqd.rawQuery("select * from useraddr", null);
l = new ArrayList();
while (cursor.moveToNext()) {
String name = cursor.getString(cursor.getColumnIndex("name"));
String tel = cursor.getString(cursor.getColumnIndex("tel"));
String addr = cursor.getString(cursor.getColumnIndex("addr"));
l.add(new User(name, tel, addr));
}
//添加
sqd.execSQL("insert into useraddr(name,tel,addr) values('"+ name + "','" + tel + "','" + addr + "')");
//刷新
sqd.execSQL("update user set age=18 where name like ?",new Object[]{"%zhang%"});
//删除
sqd.execSQL("delete from useraddr where name='"+ i.getStringExtra("name") + "'");