Redis Learning Note (4)-list

Package Cn.com;import Java.util.list;import Redis.clients.jedis.jedis;import Redis.clients.jedis.BinaryClient.LIST _position;public class Redis_list {public static Jedis Redis = new Jedis ("localhost", 6379);//Connection redis/** * Returns the specified interval in the list key Within the element, the interval is specified with an offset of start and stop. * */public static void Lrange () {redis.flushdb ();//Clear Data/** Initialize data */redis.lpush ("languages", "中文版", "chain"); Redis.lpush ("Languages", "中文版"); /** Fetch data */list<string> list=redis.lrange ("languages", 0,-1); for (String s:list) {System.out.println ("s:" +s);}} /** * Inserts one or more value values into the table header of the list key * If there are multiple value values, then each value value is inserted into the table header sequentially from left to right: * If key does not exist, an empty list is created and the Lpush operation is performed. * An error is returned when key exists but is not a list type. * */public static void Lpush () {redis.flushdb ();//Clear Data Redis.lpush ("languages", "中文版", "chain"); Redis.lpush (" Languages "," 中文版 ");//Add repeating element Redis.lpush (" languages "," 1 "," 2 "," 3 "); List<string> List=redis.lrange ("languages", 0,-1); for (String s:list) {System.out.println ("s:" +s);}} /** * LPUSHX Key value * Inserts values value into the table header of the list key, when andOnly if key exists and is a list. * As opposed to the Lpush command, when key does not exist, the LPUSHX command does nothing. * */public static void Lpushx () {redis.flushdb ();//Clear Data Redis.lpushx ("languages", "中文版"); List<string> List=redis.lrange ("languages", 0,-1); for (String s:list) {System.out.println ("s:" +s);}} /** * Rpush key value [value ...] * Inserts one or more value values into the footer of the list key (rightmost). * If key does not exist, an empty list is created and the Rpush operation is performed. * An error is returned when key exists but is not a list type. * */public static void Rpush () {redis.flushdb ();//Clear Data Redis.rpush ("languages", "中文版", "chain"); Redis.rpush (" Languages "," 中文版 ");//Add repeating element Redis.rpush (" languages "," 1 "," 2 "," 3 ");//Add repeating element list<string> List=redis.lrange ("Languages", 0,-1); for (String s:list) {System.out.println ("s:" +s);}} /** * LPUSHX Key value * Inserts values value into the tail of the list key when and only if key exists and is a list. * As opposed to the Lpush command, when key does not exist, the LPUSHX command does nothing. * */public static void Rpushx () {redis.flushdb ();//Clear Data Redis.rpush ("Languages", "1", "2", "3");//Add repeating element redis.rpushx (" Languages "," 中文版 "); List<string> List=redis.lrange ("languages", 0,-1); for (String s:lIST) {System.out.println ("s:" +s);}} /** * Remove and return the header element of the list key. * Returns NIL when key does not exist. * */public static void Lpop () {redis.flushdb ();//Clear Data Redis.lpush ("Languages", "1", "2", "3", "4", "5"); String Str=redis.lpop ("languages"); List<string> List=redis.lrange ("languages", 0,-1); SYSTEM.OUT.PRINTLN ("removed element:" +STR); SYSTEM.OUT.PRINTLN ("List of remaining elements:"); for (String s:list) {System.out.print ("" +s+ "");}} /** * Remove and return the tail element of the list key. * Returns NIL when key does not exist. * */public static void Rpop () {redis.flushdb ();//Clear Data Redis.lpush ("Languages", "1", "2", "3", "4", "5"); String Str=redis.rpop ("languages"); List<string> List=redis.lrange ("languages", 0,-1); SYSTEM.OUT.PRINTLN ("removed element:" +STR); SYSTEM.OUT.PRINTLN ("List of remaining elements:"); for (String s:list) {System.out.print ("" +s+ "");}} /** * If there is at least one non-empty list within a given key, then the header element of the first non-empty list encountered, * together with the name of the list to which the popup element belongs, the result is returned to the caller * */public static void Blpop () {REDIS.FLUSHDB ();//Clear Data//redis.lpush ("languages", "a", "B", "C", "D", "E");//Initialize Data Redis.lpush ("base", "a", "B", "C", "D");//Initialize Data list <String> List=redis.blpop (1000, "base"); for (String s:list) {System.out.println (s+ "");} List<string> list2=redis.lrange ("base", 0,-1); for (String s:list2) {System.out.println ("remaining" +s+ "");}} /** * If there is at least one non-empty list within a given key, then the tail element of the first non-empty list that is encountered is popped, and together with the name of the list to which the popup element belongs, the resulting result is returned to the caller * */public static void Brpop () {REDIS.FLUSHDB ();//Clear Data Redis.lpush ("base", "a", "B", "C", "D");//Initialize Data list<string> list=redis.brpop ("base"); for (String S:list) {System.out.println (s+ "");} List<string> list2=redis.lrange ("base", 0,-1); for (String s:list2) {System.out.println ("remaining" +s+ "");}}  /** * POPs an element from the head and puts the data that pops up in the new array with the same method (Rpoplpush) * When the list source is empty, the Brpoplpush command blocks the connection until the wait time-out, or there is another client that performs lpush on the source or Rpush command. * Timeout parameter timeout takes a number in seconds as the value. Setting the timeout parameter to 0 indicates that the blocking time can be extended indefinitely (block indefinitely). * */public static void Brpoplpush () {redis.flushdb ();//Clear Data Redis.lpush ("base", "a", "B", "C", "D");//Initialize data string s= Redis.brpoplpush ("base", "Dest", 0); System.out.println ("s:" +s); List<string> list=redis.lrange ("base", 0,-1); for (String str:list) {SystEm.out.println ("Base list" +str+ "");} List<string> List1=redis.lrange ("Dest", 0,-1); for (String Str:list1) {System.out.println ("dest list:" +str+ "");}} /** * POPs an element from the head and puts the data that pops into the new array * */public static void Rpoplpush () {redis.flushdb ();//Clear Data Redis.lpush ("base", "a", "B", "C" , "D");//Initialize Data string S=redis.rpoplpush ("base", "dest"); System.out.println ("popup element:" +s); List<string> list=redis.lrange ("base", 0,-1); for (String str:list) {System.out.println ("base list" +str+ "");} List<string> List1=redis.lrange ("Dest", 0,-1); for (String Str:list1) {System.out.println ("dest list:" +str+ "");}} /** * Lrem Key Count value * Removes the element in the list that is equal to the parameter value, based on the value of the parameter count. * Count > 0: Searches from the header to the end of the table, removing elements equal to value, count. * Count < 0: Searches from the end of the table to the header, removing the element equal to value, the number is the absolute value of count. * Count = 0: Removes all values that are equal to value in the table. * */public static void Lrem () {redis.flushdb ();//Clear Data Redis.lpush ("base", "a", "B", "C", "D", "E", "F", "G", "H");// Initialize the data long Index=redis.lrem ("base", 0, "a");//Remove the element containing a in the Set System.out.println (index); List<String> list=redis.lrange ("base", 0,-1); System.out.println ("======== remaining element =========="); for (String str:list) {System.out.println (str+ "");}} /** * LSET Key index value * Sets the value of the element with the list key subscript as index to value. * An error is returned when the index parameter is out of range, or an empty list (key does not exist) is LSET. * */public static void LSet () {redis.flushdb ();//Clear Data Redis.lpush ("base", "a", "B", "C", "D", "E", "F", "G", "H");// Initialize the data redis.lset ("base", 6, "2b");//Set the B element to 2blist<string> List=redis.lrange ("base", 0,-1); for (String s:list) { System.out.println (s);}} /** * Let the list keep only the elements within the specified interval, and the elements that are not within the specified range will be deleted. * For example, execute the command LTRIM List 4 6, which means that only the 4 to 6 elements of the list are preserved, and the remaining elements are all deleted. * */public static void LTrim () {redis.flushdb ();//Clear Data String [] s=new string[]{"A", "B", "C", "D", "E", "F", "G", "H"}; Redis.lpush ("base", s);//Initialize Data Redis.ltrim ("base", 4, 6);//value reserved b,c,d corresponding index is 4,5,6 many have been preserved list<string> list= Redis.lrange ("base", 0,-1); for (String str:list) {System.out.println (str);}} /** * Returns the length of the list key. * If key does not exist, then key is interpreted as an empty list, returning 0. * If key is not a list type, returns an error * */public static VOID Llen () {redis.flushdb ();//Clear Data Redis.lpush ("base", "a", "B", "C", "D", "E", "F", "G", "H");//Initialize Data long length= Redis.llen ("base"); System.out.println ("Length:" +length);} /** * Returns the element in the list key, subscript as index. * Subscript (Index) parameter start and stop all base on 0, that is, 0 represents the first element of the list, 1 represents the second element of the list, and so on. * You can also use a negative subscript, 1 for the last element of the list, 2 for the penultimate element of the list, and so on. * If key is not a list type, an error is returned. * */public static void Lindex () {redis.flushdb ();//Clear Data Redis.lpush ("base", "a", "B", "C", "D", "E", "F", "G", "H");// Initializes the data string S=redis.lindex ("base", 2); System.out.println (s);} /** * Linsert Key before| After Pivot value * Inserts a value in the list key, either before or after the value pivot. * No action is taken when pivot does not exist in the list key. Pivot refers to an element in an array * When key does not exist, key is treated as an empty list, and no action is taken. * If key is not a list type, an error is returned. * */public static void Linsert () {redis.flushdb ();//Clear Data Redis.lpush ("base", "a", "B", "C", "D", "E", "F", "G", "H");// Initializes the data Redis.linsert ("base", list_position. Before, "B", "2b");//Insert 2b//redis.linsert before B ("base", list_position. After, "B", "2b");//after B insert 2blist<string> list=redis.lrange ("base", 0,-1);for (String str:list) {System.out.println (str);}} public static void Main (String [] args) {Linsert ();}}

　　

Redis Learning Note (4)-list