删除数据表数据库? [英] delete data form database?
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问题描述
我怎样才能在数据库中删除数据时,我列表视图中单击一个项目?请给我一些code到这一点。
这是我的方法来选择列表视图项:
how can i delete data in database when i click an item in listview? please give me some code to that. this my method to choose item in listview:
listview.setOnItemClickListener(new OnItemClickListener(){
public void onItemClick(AdapterView adapterView, View convertView, int position, long id)
{
AlertDialog.Builder alertDialog = new AlertDialog.Builder(AndroidSpinnerFromSQLiteActivity.this);
alertDialog.setTitle("Confirm Delete...");
alertDialog.setMessage("Are you sure you want delete this?");
alertDialog.setIcon(R.drawable.delete);
alertDialog.setPositiveButton("YES",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int which) {
}
});
alertDialog.setNegativeButton("NO",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
}
});
alertDialog.show();
}
});
};
这是我的数据库类:
this my database class:
公共类数据库处理器扩展SQLiteOpenHelper {
public class DatabaseHandler extends SQLiteOpenHelper {
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "spinnerExample";
private static final String TABLE_LABELS = "labels";
private static final String KEY_ID = "id";
private static final String KEY_NAME = "name";
public DatabaseHandler(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
String CREATE_CATEGORIES_TABLE = "CREATE TABLE " + TABLE_LABELS + "("
+ KEY_ID + " INTEGER PRIMARY KEY," + KEY_NAME + " TEXT" +")";
db.execSQL(CREATE_CATEGORIES_TABLE);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_LABELS);
onCreate(db);
}
public void insertLabel(String label){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(KEY_NAME, label);
db.insert(TABLE_LABELS, null, values);
db.close();
}
public List<String> getAllLabels(){
List<String> labels = new ArrayList<String>();
String selectQuery = "SELECT * FROM " + TABLE_LABELS;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(selectQuery, null);
if (cursor.moveToFirst()) {
do {
labels.add(cursor.getString(1));
} while (cursor.moveToNext());
}
cursor.close();
db.close();
return labels;
}
}
推荐答案
添加一种方法在乌拉圭回合的数据库类code
Add one method in ur database class code
如果ü要删除表中的所有原始然后用
if u want to Delete Table All Raw then use
db.execSQL("DELETE from "+Table_Name);
其他ü要在表中删除特定的原
other u want to deleted particular Raw in table
db.delete(Table_Name, "Raw_Field_Name" + "='" + Raw_field_value+"'", null);
列表视图项的单击事件使用
list view item click event use
Listview lv;
//on create method
lv = (ListView) findViewById(R.id.list_contact_name);
lv.setOnItemClickListener(new OnItemClickListener()
{
public void onItemClick(AdapterView<?> arg0, View v, int position,
long id) {
// call DELETE method here
}
});
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