Android : SQLite 版学生系统 _Android

实践是知识的母亲，知识是生活的明灯。这篇文章主要讲述Android : SQLite 版学生系统相关的知识，希望能为你提供帮助。
【Android : SQLite 版学生系统】在 Android : ListView 学生管理中已经使用 ListView 控件实现简易学生管理功能，现在尝试采用 SQLite 数据库本地保存学生信息，并完善查询功能。
使用工具

android studio (ver. 3.5.1)
android（sdk 29)
java(ver.1.8.0)
gradle(ver. 5.4.1)

功能实现 1.创建学生实体类。

public class StuInfo implements Serializable { private String name; private String major; private String age; private String sex; private String kecheng; private String academy; private String date; private int id; ······

2.设计一个的列表来显示学生信息。

文章图片
3.创建 mysqliteAccess 类访问数据库。

public class MySQLiteAccess extends SQLiteOpenHelper { /** * @param context：上下文 * @param version：版本号 */ public MySQLiteAccess(Context context, int version) { super(context, "stu4.db", null, version); } /** * 数据库文件创建成功后调用 * SQL操作的语句 * @param db 数据库 stuAdmin.db *列： *id（int类型主键：学号） *name（text） *sex（text） *age（int） */ @Override public void onCreate(SQLiteDatabase db) { System.out.println("数据库创建"); db.execSQL("create table students(\\n" + "id integer primary keyautoincrement,\\n" + "name text,\\n" + "sex text,\\n" + "age integer,\\n" + "academy text,\\n" + "major text\\n," + "date text\\n" + "); "); db.execSQL("create table courseTable(\\n" + "stuno text ,\\n" + "course text \\n" + "); " ); } ······

3.创建 DBop 类对数据库中数据进行操作。

public class DBop { private MySQLiteAccess mySQLiteAccess; private SQLiteDatabase database; public void test(Context context) { mySQLiteAccess = new MySQLiteAccess(context, 3); database = mySQLiteAccess.getReadableDatabase(); }public void insert(StuInfo s) { int age = Integer.parseInt(s.getAge()); database.execSQL("insert into students values(?,?,?,?,?,?,?" + ")", new Object[]{null, s.getName(), s.getSex(), age, s.getAcademy(), s.getMajor(), s.getDate()}); System.out.println("插入数据成功"); }public void delete(int id) { Integer I = new Integer(id); //String n=new String(name); database.execSQL("delete from students where id=?", new Object[]{I}); }public List< StuInfo> searchByName(String key) { List< StuInfo> listByName = new ArrayList< StuInfo> (); key = "%" + key + "%"; Cursor cursor = database.rawQuery("select * from students where name like?", new String[]{key}); while (cursor.moveToNext()) {//int id=cursor.getInt(cursor.getColumnIndex("id")); String name = cursor.getString(cursor.getColumnIndex("name")); String sex = cursor.getString(cursor.getColumnIndex("sex")); String age = cursor.getString(cursor.getColumnIndex("age")); listByName.add(new StuInfo(name, sex, age)); } return listByName; } ······

4.创建 StudentAdapter

public class StudentAdapter extends BaseAdapter implements View.OnClickListener { ······ @Override public View getView(int position, View convertView, ViewGroup parent) { View stuView = View.inflate(stuContext, R.layout.list, null); TextView tv_id = stuView.findViewById(R.id.li_id); TextView tv_name = stuView.findViewById(R.id.li_name); TextView tv_academy = stuView.findViewById(R.id.li_academy); ImageView iv_edit = stuView.findViewById(R.id.li_edit); ImageView iv_delete = stuView.findViewById(R.id.li_delete); final StuInfo student = (StuInfo) stuDates.get(position); tv_id.setText(String.valueOf(student.getId())); tv_name.setText(student.getName()); tv_academy.setText(student.getAcademy()); iv_edit.setImageResource(R.drawable.edit); iv_delete.setImageResource(R.drawable.delete); //增加监听 iv_edit.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Context context = v.getContext(); Intent intent = new Intent(); intent.setClass(context, Edit.class); intent.putExtra("altStu", student); ((Activity) context).startActivity(intent); } }); iv_delete.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { dbOperate.delete(student.getId()); stuDates.remove(student); StudentAdapter.this.notifyDataSetChanged(); } }); //给删除和编辑设置标志 iv_edit.setTag(position); iv_delete.setTag(position); return stuView; } ······

5.创建 searchActivity

public class searchActivity extends AppCompatActivity implements View.OnClickListener { private Button btn_return; private ListView lv_searchlist; DBop dbOperate = new DBop(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_search); lv_searchlist = (ListView) findViewById(R.id.lv_searchlist); btn_return = (Button) findViewById(R.id.btn_return); btn_return.setOnClickListener(this); dbOperate.test(this); Bundle bundle = getIntent().getExtras(); String searchKey = bundle.getString("searchKey"); List< StuInfo> searchList = dbOperate.searchByAll(searchKey); if (!searchList.isEmpty()) { StudentAdapter myAdapter = new StudentAdapter(this, searchList); lv_searchlist.setAdapter(myAdapter); } else { Toast.makeText(this, "无结果", Toast.LENGTH_SHORT); } } ······

演示