一、新建SQLite操作类（继承SQLiteOpenHelper）
public class SQLiteTest extends SQLiteOpenHelper {
final static String DB_NAME = "test.db";//数据库名
private int version = 1;//数据库版本名
public SQLiteTest(Context context) {//当在别处调用时，只要传上下文就行了
super(context, DB_NAME, null, 1);
}
@Override
public void onCreate(SQLiteDatabase db) {
//建表
String sql = "create table if not exists students(" +
"s_id integer primary key autoincrement," +
"s_name varchar(30)," +
"s_sex integer," +
"s_age integer)";
db.execSQL(sql);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// 升级数据库
db.execSQL("drop table if exeits students");
this.onCreate(db);
}
}
二、新建对象类（比如是学生数据库就新建学生类）
注意点：get和set方法、构造方法
三、对象操作类
public class StudentDao {
private Context context;
SQLiteTest db ;
SQLiteDatabase sb;
public StudentDao(Context context) {
super();
this.context = context;
db = new SQLiteTest(context);
sb = db.getWritableDatabase();
}
//添加数据
public void addStudent(Student s){
String sql = "insert into students values(null,?,?,?)";
sb.execSQL(sql,new Object[]{s.getS_name(),s.getS_sex(),s.getS_age()});
}
//删
public void delStudent(int id){
String sql = "delete from students where s_id=?";
sb.execSQL(sql,new Object[]{id});
}
//改
public void updateStudent(Student s){
String sql = "update students set s_name=?,s_sex=?,s_age=? where s_id=?)";
sb.execSQL(sql,new Object[]{s.getS_name(),s.getS_sex(),s.getS_age(),s.getS_id()});
}
//查
public List<Student> getAllStudent(){
List<Student> list = new ArrayList<Student>();
Student s;
String sql = "select * from students";
//Cursor邮标
Cursor c = sb.rawQuery(sql, new String[]{});
while (c.moveToNext()) {
int id = c.getInt(c.getColumnIndex("s_id"));
int sex = c.getInt(c.getColumnIndex("s_sex"));
String showSex;
if(sex==0){
showSex="女";
}else {
showSex="男";
}
int age = c.getInt(c.getColumnIndex("s_age"));
String name = c.getString(c.getColumnIndex("s_name"));
s = new Student(id, name, age, showSex);
list.add(s);
}
return list;
}
}
五、在Activity中操作它：
private Button btn1;
ListView lv;
StudentDao sd;
List<Student> list;
int sid;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
}
public void init() {
sd = new StudentDao(MainActivity.this);
list = sd.getAllStudent();
btn1 = (Button) findViewById(R.id.add);
lv = (ListView) findViewById(R.id.lv_student);
lv.setAdapter(adapter);
LongClick();
}
public void LongClick() {
lv.setOnItemLongClickListener(new OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view,
int position, long id) {
// TODO Auto-generated method stub
sid = list.get(position).getS_id();
AlertDialog.Builder confirm = new AlertDialog.Builder(
MainActivity.this);
confirm.setTitle("删除确认");
confirm.setMessage("你确认要删除此信息吗？");
confirm.setNegativeButton("否", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
}
});
confirm.setPositiveButton("是", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
sd.delStudent(sid);
init();
}
});
confirm.setCancelable(false);
confirm.show();
return true;
}
});
}
public void addStu(View v) {
Intent intent = new Intent();
intent.setClass(MainActivity.this, NewStuActivity.class);
startActivity(intent);
}
BaseAdapter adapter = new BaseAdapter() {
@Override
public View getView(int position, View convertView, ViewGroup parent) {
convertView = View.inflate(MainActivity.this, R.layout.student,
null);
TextView et_id = (TextView) convertView.findViewById(R.id.tv_id);
TextView et_name = (TextView) convertView
.findViewById(R.id.tv_name);
TextView et_sex = (TextView) convertView.findViewById(R.id.tv_sex);
TextView et_age = (TextView) convertView.findViewById(R.id.tv_age);
et_id.setText(list.get(position).getS_id() + "");
et_name.setText(list.get(position).getS_name());
et_sex.setText(list.get(position).getShowSex());
et_age.setText(list.get(position).getS_age() + "");
return convertView;
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return list.get(position);
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}
};
xml略