Naprawdę potrzebuję pliku bazy danych sqlite do badań. Tworzę aplikację w C # i potrzebuję bazy danych z wieloma tabelami, polami, widokami, indeksami, ograniczeniami i tak dalej. I nie chcę go tworzyć samodzielnie za pomocą narzędzia wiersza poleceń sqlite.
Więc przypuszczam, że ktoś może powiedzieć, gdzie mogę znaleźć taki plik, mogą to być różne aplikacje lub przykłady, a nawet może przesłać mi własny plik bazy danych. Będę wdzięczny za każdą pomoc.
Odpowiedzi:
Istnieje ładna przykładowa baza danych o nazwie Chinook. Stara się być nowoczesnym przykładem, który zastąpi NorthWind. Mają wersje dla różnych serwerów baz danych, w tym SQLite.
Sprawdź również ten przykład na forach klientów SQLite .NET (dołączonych do pierwszego postu)
Może narzędzie GUI do tworzenia bazy danych ułatwi rozpoczęcie, sprawdź to, bezpłatne do użytku osobistego
Osobiście tworzę bazy danych SQLite do testowania mapowań NHibernate. Zwykle tworzę swoje klasy i mapowania, a następnie używam mapowań do generowania schematu do nowego pliku SQLite (lub częściej w bazie danych pamięci) i używam tego. Większość artykułów wprowadzających do NHibernate również to robi.
SQLite jest powszechnie używany przez wiele aplikacji, więc jestem pewien, że wiele przykładów można znaleźć na twoim komputerze. Na przykład na moim komputerze z Win10, jeśli wyszukam w „c: \ Users \ Konstantin” (mój profil) pliki z:
Obecnie otrzymuję 785 wyników. Większość z nich ma ten tekst na początku - to 99% plików baz danych SQLite. W szczególności widzę, że jest używany przez skype, viber, dropbox, office i firefox.
Użyłem operacji sqlightCrud
Pierwsza klasa bazy danych Creat. package com.db;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
import android.widget.Toast;
public class DataBaseSampleActivity {
/** for database */
static final String DataBaseName = "EmployeDB";
/** for employee table */
static final String EmployeTable = "Employees";
static final String ColEmpID = "EmpId";
static final String ColEmpName = "EmpName";
static final String ColEmpAge = "EmpAge";
static final String ColDept = "Dept";
/** for department table */
static final String DeptTable = "Department";
static final String ColDeptID = "DeptId";
static final String ColDeptName = "DeptName";
public static final int DATABASE_VERSION = 2;
//private static final String KEY_ROWID = "_id";
private static final String EMPLOYEE_TABLE_CREATE ="Create table " + EmployeTable +
//"(_id INTEGER UNIQUE," + [old code]
"("+ColEmpID + " INTEGER PRIMARY KEY AUTOINCREMENT," +
ColEmpName + " VARCHAR(15) ," +
ColEmpAge + " INT(15) ," +
ColDept + " VARCHAR(15)) ";
private final Context context;
private DatabaseHelper DBHelper;
private SQLiteDatabase db;
public DataBaseSampleActivity(Context ctx){
Log.i("test****", "**test***");
this.context = ctx;
DBHelper = new DatabaseHelper(context);
}
private static class DatabaseHelper extends SQLiteOpenHelper{
public DatabaseHelper(Context context){
super(context, DataBaseName , null, DATABASE_VERSION);
Log.i("context","context");
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL(EMPLOYEE_TABLE_CREATE);
Log.i("************", "table created");
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
Log.w("tag", "Upgrading database from version " + oldVersion + " to "+ newVersion + ", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS " + EmployeTable);
onCreate(db);
}
};
public DataBaseSampleActivity open() throws SQLException{
db = DBHelper.getWritableDatabase();
Log.i("open", "message");
return this;
}
public void close(){
DBHelper.close();
}
//public long insert(Integer empid, String empname, Integer empage, String empdept) {
public long insert(String empname, Integer empage, String empdept) {
Log.i("**** suruchitest **** ","*** test ***");
ContentValues initialValues = new ContentValues();
//initialValues.put(ColEmpID, empid);
initialValues.put(ColEmpName, empname);
initialValues.put(ColEmpAge, empage);
initialValues.put(ColDept, empdept);
return db.insert(EmployeTable, null, initialValues);
}
public Cursor getEmpValues(){
Cursor mCursor = db.query(EmployeTable, null, null, null, null, null, null);
return mCursor;
}
public boolean deleteEmpList(long rowId){
Toast.makeText(context, "deleted", 2000).show();
return db.delete(EmployeTable, ColEmpID +" = " + rowId, null) > 0;
}
public boolean updateEmplist(String empname, Integer empage, String empdept, Integer rowid){
ContentValues initialValues = new ContentValues();
Log.i("##### "+rowid,""+empname+" "+empage+" "+empdept);
//initialValues.put(ColEmpID, rowid);
initialValues.put(ColEmpName,empname);
initialValues.put(ColEmpAge,empage);
initialValues.put(ColDept,empdept);
try{
int b = db.update(EmployeTable, initialValues, ColEmpID+ " = " + rowid, null);
Log.i("update", "up "+rowid+" ddd "+b);
return true;
}catch (Exception e){
Log.d("asdfasdfsadfasdf", "_--___--__--_=-_");
return false;
}
}
}
2. create Main Activity
package com.db;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends Activity implements OnClickListener {
Button buttonsubmit;
EditText empid,empname,empage,empdept;
String emp_name, emp_dept;
//Integer emp_id,emp_age;
Integer emp_age;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
buttonsubmit = (Button) findViewById(R.id.btnSubmit);
buttonsubmit.setOnClickListener(this);
// empid =(EditText) findViewById(R.id.empid);
empname =(EditText) findViewById(R.id.empname);
empage =(EditText) findViewById(R.id.empage);
empdept =(EditText) findViewById(R.id.empdpt);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
DataBaseSampleActivity dbObj = new DataBaseSampleActivity(getApplicationContext());
// String Emp_ids = empid.getText().toString();
// emp_id = Integer.parseInt(Emp_ids);
//emp_id = empid.getText().toString();
String Emp_ages = empage.getText().toString();
emp_age = Integer.parseInt(Emp_ages);
//emp_age = empage.getText().toString();
emp_name = empname.getText().toString();
emp_dept = empdept.getText().toString();
try {
Log.i("try", "message");
dbObj.open();
//long temp = dbObj.insert(emp_id, emp_name, emp_age, emp_dept);
long temp = dbObj.insert(emp_name, emp_age, emp_dept);
//Toast.makeText(getApplicationContext(), "temp"+temp, 3000).show();
dbObj.close();
Intent intent = new Intent(this,ShowListView.class);
startActivity(intent);
} catch (Exception e) {
// TODO: handle exception
Log.i("catch", "message");
}
}
}
2. Create listclass to show tha data
package com.db;
import java.lang.reflect.Array;
import java.util.ArrayList;
import android.R.integer;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
public class ShowListView extends Activity {
ArrayList<String> arrname = new ArrayList<String>();
ArrayList<String> arrage = new ArrayList<String>();
ArrayList<String> arrdept = new ArrayList<String>();
ArrayList<Integer> arrRowId = new ArrayList<Integer>();
ArrayList<Integer> arrDelId = new ArrayList<Integer>();
Array[] arr;
Button deleteBtn;
Button btnadd;
int index = 0;
public int pos;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.emplist);
//Toast.makeText(getApplicationContext(), "LIST VIEW", 5000).show();
ToGetCursorValues();
}
public void ToGetCursorValues(){
DataBaseSampleActivity db = new DataBaseSampleActivity(getApplicationContext());
db.open();
try {
Cursor cur = db.getEmpValues();
cur.moveToFirst();
arrRowId.clear();
arrname.clear();
arrage.clear();
arrdept.clear();
while (!cur.isAfterLast()) {
arrRowId.add(cur.getInt(cur.getColumnIndex(db.ColEmpID)));
arrname.add(cur.getString(cur.getColumnIndex(db.ColEmpName)));
arrage.add(cur.getString(cur.getColumnIndex(db.ColEmpAge)));
arrdept.add(cur.getString(cur.getColumnIndex(db.ColDept)));
cur.moveToNext();
}
//Log.i("#####","col "+arrlist.size());
//Toast.makeText(getApplicationContext(), "* "+arrname.size()+","+arrage.size()+","+arrdept.size(), 5000).show();
//Toast.makeText(getApplicationContext(), "***** "+arrRowId.get(0), 2000).show();
} catch (Exception e) {
// TODO: handle exception
}
ListView lst = (ListView) findViewById(R.id.mylist);
lst.setAdapter(new ListAdapter(getApplicationContext()));
db.close();
}
public class ListAdapter extends BaseAdapter implements OnCheckedChangeListener,OnClickListener{
private LayoutInflater inflater = null;
public ListAdapter(Context c){
Log.i("Context","Context");
inflater = LayoutInflater.from(c);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
//return 0;
return arrname.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return null;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}
class ViewHolder{
TextView empnameview;
TextView empageview;
TextView empdeptview;
CheckBox empchkbox;
}
// create a new ImageView for each item referenced by the Adapter
public View getView(final int position, View convertView, ViewGroup parent) {
Log.i("*view","view*");
ViewHolder vh;
//ImageView imageView;
if (convertView == null) { // if it's not recycled, initialize some attributes
Log.i("*null1*","*null1*");
vh = new ViewHolder();
convertView = inflater.inflate(R.layout.customlist, null);
Log.i("*null2*","*null2*");
pos = position;
vh.empnameview = (TextView) convertView.findViewById(R.id.ename);
vh.empageview = (TextView) convertView.findViewById(R.id.eage);
vh.empdeptview = (TextView) convertView.findViewById(R.id.edept);
vh.empchkbox = (CheckBox) convertView.findViewById(R.id.ckekDelete);
Log.i("*null3*","*null3*");
vh.empnameview.setText(arrname.get(position));
vh.empnameview.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(ShowListView.this,UpdateDB.class);
String name = arrname.get(position);
int age = Integer.parseInt(arrage.get(position));
String dept = arrdept.get(position);
int rowid = arrRowId.get(position);
intent.putExtra("KeyName" , name);
intent.putExtra("Keyage" , age);
intent.putExtra("Keydept" , dept);
intent.putExtra("Rowid", rowid);
startActivity(intent);
}
});
vh.empageview.setText(arrage.get(position));
vh.empdeptview.setText(arrdept.get(position));
vh.empchkbox.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
// TODO Auto-generated method stub
//Toast.makeText(getApplicationContext(), "OnChecked"+position, 2000).show();
if(buttonView.isChecked()){
arrDelId.add(arrRowId.get(position));
//Toast.makeText(getApplicationContext(), "OnChecked"+position, 2000).show();
// DataBaseSampleActivity db = new DataBaseSampleActivity(getApplicationContext());
// db.open();
// db.deleteEmpList(arrRowId.get(position));
// Toast.makeText(getApplicationContext(), "delet", 3000).show();
// db.close();
//
}
else{
for(int i=0;i<arrDelId.size();i++){
if(arrRowId.get(position) == arrDelId.get(i)){
arrDelId.remove(i);
}
}
}
}
});
Log.i("******", "complete");
} else {
Log.i("*not*","*not*");
vh = (ViewHolder) convertView.getTag();
}
deleteBtn = (Button) findViewById(R.id.delBtn);
deleteBtn.setOnClickListener(this);
btnadd = (Button) findViewById(R.id.addBtn);
btnadd.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent inte = new Intent(ShowListView.this, MainActivity.class);
startActivity(inte);
}
});
// imageView.setImageResource(thumbarr[position]);
return convertView;
}
public View getView1(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
for(int i=0;i<arrDelId.size();i++){
//Toast.makeText(getApplicationContext(), "OnDeleteClick "+i, 2000).show();
DataBaseSampleActivity db = new DataBaseSampleActivity(getApplicationContext());
db.open();
db.deleteEmpList(arrDelId.get(i));
//Toast.makeText(getApplicationContext(), "delet", 3000).show();
db.close();
}
ToGetCursorValues();
}
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
// TODO Auto-generated method stub
}
}
}
3. for update
package com.db;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class UpdateDB extends Activity implements OnClickListener{
Intent intnt;
EditText editname,editage,editdept;
Button updateBtn;
int row_id;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
editname = (EditText) findViewById(R.id.empname);
editage = (EditText) findViewById(R.id.empage);
editdept = (EditText) findViewById(R.id.empdpt);
updateBtn = (Button) findViewById(R.id.btnSubmit);
updateBtn.setText("Update");
intnt = getIntent();
editname.setText(intnt.getStringExtra("KeyName"));
editage.setText(""+intnt.getIntExtra("Keyage",0));
editdept.setText(intnt.getStringExtra("Keydept"));
row_id = intnt.getIntExtra("Rowid", 0);
updateBtn.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Toast.makeText(getApplicationContext(), "update", 3000).show();
DataBaseSampleActivity db = new DataBaseSampleActivity(getApplicationContext());
db.open();
String empname = editname.getText().toString();
int empage = Integer.parseInt(editage.getText().toString());
String empdept = editdept.getText().toString();
//db.deleteEmpList(row_id);
db.updateEmplist(empname, empage, empdept,row_id);
//Toast.makeText(getApplicationContext(), "delet", 3000).show();
db.close();
Intent list = new Intent(UpdateDB.this,ShowListView.class);
startActivity(list);
}
});
// Toast.makeText(getApplicationContext(), "update "+intnt.getIntExtra("Keyage",0), 3000).show();
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
}