SQLite 创建 查询 增加

public class UserDBHelper extends SQLiteOpenHelper

{

private static String datebase_name = "user_datebase";

public static String table_name = "user_table";

public UserDBHelper(Context context, String name, CursorFactory factory,

int version) {

super(context, name, factory, version);

// TODO Auto-generated constructor stub

}

public UserDBHelper(Context c){

this(c,datebase_name,null,1);

System.out.println("userdb");

}

@Override

public void onCreate(SQLiteDatabase db) {

// TODO Auto-generated method stub

System.out.println("enter oncreeat");

db.execSQL("create table "+table_name+" (user_id integer primary key autoincrement,user_name text,user_pswd text)");

System.out.println("over oncreate");

}

@Override

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

// TODO Auto-generated method stub

db.execSQL("drop table "+table_name);

this.onCreate(db);

}

}

private void insertIP()

{

String ip=IP.getText().toString();

System.out.println("ip:"+ip);

IPDB db = new IPDB(IpActivity.this);

int type=db.getType();

System.out.println("type:"+type);

SQLiteDatabase sd= db.getReadableDatabase();

String de="delete from "+IPDB.table_name ;

sd.execSQL(de);

System.out.println("ip删除成功！");

sd.close();

SQLiteDatabase sd1 = db.getWritableDatabase();

sd1.execSQL("insert into "+IPDB.table_name+" values(null,?)",new String[]{ip});

sd1.close();

db.close();

HttpURL.setIpHttp(ip);

Toast.makeText(IpActivity.this, "保存成功！", Toast.LENGTH_SHORT).show();

}

private String getIP()

{

String ip=null;

IPDB db = new IPDB(CybertronMainActivity.this);

SQLiteDatabase sd = db.getReadableDatabase();

Cursor c = sd.rawQuery("select ip_name from "+IPDB.table_name+"", null);

while(c.moveToNext()){

ip = c.getString(0);

System.out.println("ip:"+ip);

}

c.close();

sd.close();

db.close();

return ip;

}