android - 数据库未检索数据

public class Database_Activity { public int id; private DbHelper ourHelper; private Context ourContext; private SQLiteDatabase ourDatabase; private static class DbHelper extends SQLiteOpenHelper { // this is database name (change it as you want) public DbHelper(Context context) { super(context, "shrirang", null, 1); } @Override // create corrsponding tables public void onCreate(SQLiteDatabase db) { db.execSQL("CREATE TABLE travel ( id INTEGER PRIMARY KEY AUTOINCREMENT, src TEXT NOT NULL,dest TEXT NOT NULL,bcost INTEGER NOT NULL,tcost INTEGER,acost INTEGER);"); db.execSQL("CREATE TABLE bus ( bid INTEGER PRIMARY KEY AUTOINCREMENT, bsname TEXT NOT NULL, bsrc TEXT NOT NULL,bdest TEXT NOT NULL,bcost INTEGER NOT NULL,bt1 TEXT NOT NULL,bt2 TEXT NOT NULL);"); db.execSQL("CREATE TABLE train ( tid INTEGER PRIMARY KEY AUTOINCREMENT, trname TEXT NOT NULL, tsrc TEXT NOT NULL,tdest TEXT NOT NULL,tcost INTEGER NOT NULL,tt1 TEXT NOT NULL,tt2 TEXT NOT NULL);"); db.execSQL("CREATE TABLE flight ( fid INTEGER PRIMARY KEY AUTOINCREMENT, flname TEXT NOT NULL, fsrc TEXT NOT NULL,fdest TEXT NOT NULL,fcost INTEGER NOT NULL,ft1 TEXT NOT NULL,ft2 TEXT NOT NULL);"); db.execSQL("CREATE TABLE history ( sid INTEGER PRIMARY KEY AUTOINCREMENT, src TEXT NOT NULL,dest TEXT NOT NULL,budget INTEGER NOT NULL, day INTEGER NOT NULL,mon INTEGER NOT NULL, year INTEGER NOT NULL);"); db.execSQL("CREATE TABLE install (db INTEGER NOT NULL);"); } @Override // if tables all ready exist then delete public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { db.execSQL("DROP TABLE IF EXISTS travel"); db.execSQL("DROP TABLE IF EXISTS bus"); db.execSQL("DROP TABLE IF EXISTS train"); db.execSQL("DROP TABLE IF EXISTS flight"); db.execSQL("DROP TABLE IF EXISTS history"); db.execSQL("DROP TABLE IF EXISTS install"); onCreate(db); } } public Database_Activity(Context c) { ourContext = c; } // method for opening database public Database_Activity open() throws SQLException { ourHelper = new DbHelper(ourContext); ourDatabase = ourHelper.getWritableDatabase(); return this; } // method for creating entry public long createentry(String src, String dest, int bcost,int tcost,int acost) { ContentValues cv = new ContentValues(); cv.put("src", src); cv.put("dest", dest); cv.put("bcost", bcost); cv.put("tcost", tcost); cv.put("acost", acost); return ourDatabase.insert("travel", null, cv); } // method for adding bus details public long Add_BUS_Entry(String bname, String bsrc, String bdest, int bcost,String bt1,String bt2) { ContentValues cv = new ContentValues(); cv.put("bsname", bname); cv.put("bsrc", bsrc); cv.put("bdest", bdest); cv.put("bcost",bcost); cv.put("bt1", bt1); cv.put("bt2", bt2); return ourDatabase.insert("bus", null, cv); } // method for add train to database public long Add_TRAIN_Entry(String trname, String src, String dest, int cost,String t1,String t2) { ContentValues cv = new ContentValues(); cv.put("trname", trname); cv.put("tsrc", src); cv.put("tdest", dest); cv.put("tcost",cost); cv.put("tt1", t1); cv.put("tt2", t2); return ourDatabase.insert("train", null, cv); } // method for add flight to databse public long Add_FLIGHT_Entry(String flname, String src, String dest, int cost,String t1,String t2) { ContentValues cv = new ContentValues(); cv.put("flname", flname); cv.put("fsrc", src); cv.put("fdest", dest); cv.put("fcost",cost); cv.put("ft1", t1); cv.put("ft2", t2); return ourDatabase.insert("flight", null, cv); } // method for closing database public void close() { ourHelper.close(); } // method for showing database entries public String getData() { String[] columns = new String[] { "id", "src", "dest", "bcost" , "tcost", "acost"}; Cursor c = ourDatabase.query("travel", columns, null, null, null, null, null); String result = ""; int iRow = c.getColumnIndex("id"); int iun = c.getColumnIndex("src"); int ipw = c.getColumnIndex("dest"); int ib = c.getColumnIndex("bcost"); int it = c.getColumnIndex("tcost"); int ia = c.getColumnIndex("acost"); for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) { result = result + c.getString(iRow) + " " + c.getString(iun) + " " + c.getString(ipw) + " " + c.getShort(ib) + " " + c.getShort(it)+ " " + c.getShort(ia)+ "\n"; } return result; } // method for adding search entry public long AddSearch_entry(String s, String d, int b, int day, int mon, int year) { ContentValues cv = new ContentValues(); cv.put("src", s); cv.put("dest", d); cv.put("budget", b); cv.put("day", day); cv.put("mon", mon); cv.put("year", year); return ourDatabase.insert("history", null, cv); } // method for getting search data public String getSearchData() { String[] columns = new String[] { "sid", "src", "dest", "budget" , "day", "mon","year"}; Cursor c = ourDatabase.query("history", columns, null, null, null, null, null); String result = ""; int iRow = c.getColumnIndex("sid"); int iun = c.getColumnIndex("src"); int ipw = c.getColumnIndex("dest"); int ib = c.getColumnIndex("budget"); int it = c.getColumnIndex("day"); int ia = c.getColumnIndex("mon"); int ic = c.getColumnIndex("year"); for (c.moveToFirst(); !c.isAfterLast(); c.moveToNext()) { result = result + c.getString(iRow) + " " + c.getString(iun) + " " + c.getString(ipw) + " " + c.getShort(ib) + " " + c.getShort(it)+ "/" + c.getShort(ia)+ "/" + c.getShort(ic)+ "\n"; } return result; } // methods for reading corrosponding database entries public Cursor GetLatestSearch() { return ourDatabase.query("history", new String[] {"sid","src","dest","budget","day","mon","year"},null, null, null, null, null); } public Cursor Get_BUS_details() { return ourDatabase.query("bus", new String[] {"bid","bsname","bsrc","bdest","bcost","bt1","bt2"},null, null, null, null, null); } public Cursor findBUS(int temp) { return ourDatabase.query("bus", new String[] {"bid","bsname","bsrc","bdest","bcost","bt1","bt2"},"bid="+temp, null, null, null, null); } public Cursor Get_TRAIN_Details() { return ourDatabase.query("train", new String[] {"tid","trname","tsrc","tdest","tcost","tt1","tt2"},null, null, null, null, null); } public Cursor findTRAIN(int temp) { return ourDatabase.query("train", new String[] {"tid","trname","tsrc","tdest","tcost","tt1","tt2"},"tid="+temp, null, null, null, null); } public Cursor findAIR(int temp) { return ourDatabase.query("flight", new String[] {"fid","flname","fsrc","fdest","fcost","ft1","ft2"},"fid="+temp, null, null, null, null); } public Cursor Get_flight_details() { return ourDatabase.query("flight", new String[] {"fid","flname","fsrc","fdest","fcost","ft1","ft2"},null, null, null, null, null); } public Cursor GetHistorySearch(long schid) { return ourDatabase.query("history", new String[] {"sid","src","dest","budget","day","mon","year"},"sid="+schid, null, null, null, null); } // method for deleting history public void DeleteHistory() { ourDatabase.delete("history", null, null); } public int getM() { String[] columns = new String[] { "id", "src", "dest", "bcost" , "tcost", "acost"}; Cursor c = ourDatabase.query("travel", columns, null, null, null, null, null); int iRow = c.getColumnIndex("id"); return iRow; } public int Install() { int t; String[] columns = new String[]{"db"}; Cursor c = ourDatabase.query("install", columns,null, null, null, null, null); if (c != null){ c.moveToFirst(); t = c.getInt(0); return t; } return 0; } public long AddDB() { ContentValues cv = new ContentValues(); cv.put("db", "1"); return ourDatabase.insert("install", null, cv); } }

public class Train extends ListActivity{ LayoutInflater mInflater; static Object[] wer; static Object searchid; Dialog dialog = null; String s1="",s2="",s3="",info=""; private long schid = 0; String title = "",url=""; String f="",t="",b="",a="",d="",n=""; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); try{ // set screen 'srchres.xml' setContentView(R.layout.bus); List<String> strings; // create string list to store search entry final List<String> listid; // create string list for store list id's strings = new ArrayList<String>(); listid = new ArrayList<String>(); super.onCreate(savedInstanceState); Database_Activity db_obj = new Database_Activity(this); // Define strings to store database entries @SuppressWarnings("unused") String temp0="",t="",temp1="", temp2="", temp3="" ,temp4=""; @SuppressWarnings("unused") String bt0="",bt="",bt1="", bt2="", bt3="" ,bt4=""; @SuppressWarnings("unused") String at0="",at="",at1="", at2="", at3="" ,at4=""; db_obj.open(); // open database // ** check for who is starting activity either MainActivity.java (or) History.java ** if(getIntent().getExtras() != null)// if this is true it is from History.java { // Get a History list index which we have selected Bundle bun2 = getIntent().getExtras(); if (null == bun2) return; this.schid = bun2.getLong("uid"); Cursor c2 = db_obj.GetHistorySearch(schid); // get search history from database if (c2.moveToFirst()) { s1=c2.getString(1); // get source s2=c2.getString(2); // get destination s3=c2.getString(3); // get budget } } else // if not then it is from MainActivity.java { Cursor c1 = db_obj.GetLatestSearch(); // Get search which is searched now if (c1.moveToFirst()) { s1=c1.getString(1); // get source s2=c1.getString(2); // get destination s3=c1.getString(3); // get budget } } int co = Integer.parseInt(s3.toString()); Cursor c = db_obj.Get_TRAIN_Details(); if(c.moveToFirst()){ // Retrive train information from database bt0 = c.getString(0); title = c.getString(1); bt = c.getString(2); bt1 = c.getString(3); bt2 = c.getString(4); int cost2 = Integer.parseInt(bt2.toString()); bt3 = c.getString(5); bt4 = c.getString(6); // Compare given source, destination and budget with database entries if(s1.equalsIgnoreCase(bt) && s2.equalsIgnoreCase(bt1) && co>=cost2) { // ** if searched entry available in database show data info = bt+" to "+bt1+" in "+bt2+" at "+bt3; listid.add("B"+bt0); strings.add(info); } mInflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE); } db_obj.close(); // close database // Add search result to list setListAdapter(new ArrayAdapter<String>(this, R.layout.wtlist_item1, strings) { @Override public View getView(int position, View convertView, ViewGroup parent) { View row; if (null == convertView) { row = mInflater.inflate(R.layout.wtlist_item1, null); } else { row = convertView; } TextView tv = (TextView) row.findViewById(android.R.id.text1); tv.setText(getItem(position)); return row; } }); ListView lv = getListView(); //** Add action for click on search result ** lv.setOnItemClickListener(new OnItemClickListener() { @SuppressWarnings("deprecation") public void onItemClick(AdapterView<?> parent, View view,int position, long id) { wer = listid.toArray(); searchid = wer[(int)id]; // add id to list // Show small dialog box showDialog(7); } }); }catch(Exception e) { Toast.makeText(getApplicationContext(), "Error"+e, Toast.LENGTH_LONG).show(); } }