keyset

Keyset Pagination - Filter By Search Term across Multiple Columns

由 三世轮回 提交于 2020-08-27 22:06:37
问题 I'm trying to move away from OFFSET/FETCH pagination to Keyset Pagination (also known as Seek Method). Since I'm just started, there are many questions I have in my mind but this is one of many where I try to get the pagination right along with Filter. So I have 2 tables aspnet_users having columns PK UserId uniquidentifier Fields UserName NVARCHAR(256) NOT NULL, AffiliateTag varchar(50) NULL .....other fields aspnet_membership having columns PK+FK UserId uniquidentifier Fields Email NVARCHAR

Keyset Pagination - Filter By Search Term across Multiple Columns

由 大城市里の小女人 提交于 2020-08-27 22:05:11
问题 I'm trying to move away from OFFSET/FETCH pagination to Keyset Pagination (also known as Seek Method). Since I'm just started, there are many questions I have in my mind but this is one of many where I try to get the pagination right along with Filter. So I have 2 tables aspnet_users having columns PK UserId uniquidentifier Fields UserName NVARCHAR(256) NOT NULL, AffiliateTag varchar(50) NULL .....other fields aspnet_membership having columns PK+FK UserId uniquidentifier Fields Email NVARCHAR

Are keySet entries of a WeakHashMap never null?

由 六眼飞鱼酱① 提交于 2019-12-23 07:29:12
问题 If I iterate over the key set of a WeakHashMap, do I need to check for null values? WeakHashMap<MyObject, WeakReference<MyObject>> hm = new WeakHashMap<MyObject, WeakReference<MyObject>>(); for ( MyObject item : hm.keySet() ) { if ( item != null ) { // <- Is this test necessary? // Do something... } } In other words, can elements of the WeakHashMap be collected while I am iterating over them? EDIT For the sake of this question, one can assume that no null entries is added in the hash map. 回答1

Python 3 installation failed 'Keyset as registered is invalid'

由 混江龙づ霸主 提交于 2019-12-20 03:17:15
问题 I have been trying to get Python 3 installed, but this error occurs: I am running it on Windows 8 64-bit. I will keep trying. Thanks for the help. I didn't find any articles on the matter, so I came here. 回答1: I encounterd this problem for all applications, meaning that when I tried to install an application the same error will pop up "keyset as registered is invalid". The solution for me was to delete the folder S-1-5-21-3065067753-4167832549-3323262698-1001 found here: %AppData%\Microsoft

java hashmap word count from a text file

由 北城以北 提交于 2019-12-14 03:33:02
问题 I am trying to code to read info from a text file, I need to find out how many times each word separated by white space occurs. I then need to output in alphabetical order with the count of each word. I am looking to use a TreeMap, keySet() and an Iterator. My code is very incomplete and I am quite stuck. import java.util.HashMap; import java.util.Map public class WordCount<E extends Comparable<E>> { private static Map<String, Integer> map = new HashMap<String, Integer>(); static { fillMap

“System.Security.Cryptography.CryptographicException: Keyset does not exist” when reading private key from remote machine

由 主宰稳场 提交于 2019-12-10 23:55:17
问题 I am trying to access the private key of an X509 certificate intalled in a certificate store on a remote machine. Whilst I can access the cert store and the certificate on the remote server, I get the error "System.Security.Cryptography.CryptographicException: Keyset does not exist" when I call the PrivateKey property of the X509Certificate2 object. I have been through answers given for this error but none of them seem to work for me. I have verified that the user calling my code has

converting hashmap to stringarray

由 僤鯓⒐⒋嵵緔 提交于 2019-12-06 11:48:14
问题 I am trying to convert a hashmap into an array, that I can put in a created string array. I however get java.lang. I have typeconverted my drinkar.keySet().toArray() to String[], but it will still not work. public String[] receiveArrayList(){ String[] list = new String[0]; try { ois = new ObjectInputStream(socket.getInputStream()); drinkar = (HashMap<String, ArrayList<String>>) (ois.readObject()); System.out.println(drinkar); System.out.println(Arrays.toString(drinkar.keySet().toArray()));

converting hashmap to stringarray

由 若如初见. 提交于 2019-12-04 17:19:16
I am trying to convert a hashmap into an array, that I can put in a created string array. I however get java.lang. I have typeconverted my drinkar.keySet().toArray() to String[], but it will still not work. public String[] receiveArrayList(){ String[] list = new String[0]; try { ois = new ObjectInputStream(socket.getInputStream()); drinkar = (HashMap<String, ArrayList<String>>) (ois.readObject()); System.out.println(drinkar); System.out.println(Arrays.toString(drinkar.keySet().toArray())); list = (String[]) (drinkar.keySet().toArray()); for(int i = 0; i < list.length; i++){ System.out.println

Why Java 6 overrides keySet(), entrySet() and values() interface in SortedMap

由 一个人想着一个人 提交于 2019-12-02 03:53:13
问题 Java 5 http://docs.oracle.com/javase/1.5.0/docs/api/java/util/SortedMap.html Java 6 https://docs.oracle.com/javase/6/docs/api/java/util/SortedMap.html As you can see that since Java 6, these three apis are overridden. Can anyone tell me what's the purpose of making such a change? 回答1: The methods had to be overridden in order to have their own Javadoc. Other reasons why you would declare a method in a subinterface are the ability to restrict the return type or to add annotations, but they

java collections - keyset() vs entrySet() in map

由 那年仲夏 提交于 2019-11-28 18:40:55
问题 I put a string array elements is a map where elements of string array is key and frequency of word is value, e.g.: String[] args = {"if","it","is","to","be","it","is","up","me","to","delegate"}; then the map will have entries like [ if:1, it:2 .... ] Set<String> keys = m.keySet(); System.out.println("keyset of the map : "+keys); prints all keys: "if","it","is","to","be","it","is","up","me","to","delegate" Set<Map.Entry<String, Integer>> entrySet = m.entrySet(); Iterator<Map.Entry<String,
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