Android 单击按钮即可删除sqlite数据库中的行
dhelper.java-单击活动类函数名称delete行中的按钮时调用deleteshowById2函数,在该函数中传递类上下文并传递名称Android 单击按钮即可删除sqlite数据库中的行,android,database,sqlite,delete-row,Android,Database,Sqlite,Delete Row,dhelper.java-单击活动类函数名称delete行中的按钮时调用deleteshowById2函数,在该函数中传递类上下文并传递名称 public static int deleteShowById2(String name, Context ctx) { DBHelper dbHelper = new DBHelper(ctx); SQLiteDatabase db = dbHelper.getReadableDatabase(); String where
public static int deleteShowById2(String name, Context ctx) {
DBHelper dbHelper = new DBHelper(ctx);
SQLiteDatabase db = dbHelper.getReadableDatabase();
String where = "showId='"+name+"'";
return db.delete(TableName, where, null);
}
活动课
public void deleteRow()
{
name=e1.getText().toString();
MyfirstPojo ob=new MyfirstPojo();
ob.setName(name);
int i=0;
i=dheloper.deleteShowById2(name,this);
if(i>0){
Toast.makeText(this, "One Row Deleted", Toast.LENGTH_LONG).show();
}
}
Button deletebutton=(Button)findViewById(R.id.button3);
deletebutton.setOnClickListener(this);
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.button1 :
gettext();
break;
case R.id.button2 :
Intent i=new Intent(MyfirstdatabaseActivity.thiViewDetailsActivity.class);
startActivity(i);
finish();
case R.id.button3 :
deleteRow();
default:
break;
}
}
无法删除以只读状态打开的数据库中的行。改用这个:
SQLiteDatabase db = dbHelper.getWritableDatabase();
改变这个
SQLiteDatabase db = dbHelper.getReadableDatabase();
对此
SQLiteDatabase db = dbHelper.getWritableDatabase();
你能解释一下MyfirstdatabaseActivity.thiViewDetailsActivity.class行吗?
SQLiteDatabase db = dbHelper.getWritableDatabase();