HBase Basic API (Java) operations (add and revise)

Package hbaseexec2;/* * Create a students table and perform related operations */import Java.io.ioexception;import Java.util.arraylist;import Java.util.list;import Org.apache.hadoop.conf.configuration;import org.apache.hadoop.hbase.HBaseConfiguration; Import Org.apache.hadoop.hbase.hcolumndescriptor;import Org.apache.hadoop.hbase.htabledescriptor;import Org.apache.hadoop.hbase.keyvalue;import Org.apache.hadoop.hbase.client.delete;import Org.apache.hadoop.hbase.client.get;import Org.apache.hadoop.hbase.client.hbaseadmin;import Org.apache.hadoop.hbase.client.htable;import Org.apache.hadoop.hbase.client.put;import Org.apache.hadoop.hbase.client.result;import Org.apache.hadoop.hbase.client.resultscanner;import Org.apache.hadoop.hbase.client.scan;import Org.apache.hadoop.hbase.util.bytes;public class HBaseJavaAPI {// Declare static config private static configuration conf = null;static {conf = Hbaseconfiguration.create (); Conf.set (" Hbase.zookeeper.quorum "," 192.168.6.91 "); Conf.set (" Hbase.zookeeper.property.clientPort "," 2181 ");} Determine if a table exists pRivate Static Boolean isexist (String tableName) throws IOException {hbaseadmin hadmin = new Hbaseadmin (conf); return hadmin . tableexists (tableName);} Create database table public static void CreateTable (String tableName, string[] columnfamilys) throws Exception {// Create a new database administrator hbaseadmin hadmin = new Hbaseadmin (conf), if (Hadmin.tableexists (TableName)) {System.out.println ("table" + Tablename+ "already exists! "); System.exit (0);} else {//Create a description of the students table Htabledescriptor Tabledesc = new Htabledescriptor (tableName);//Add the column family for in the description for (String Columnfamily:columnfamilys) {tabledesc.addfamily (new Hcolumndescriptor (columnfamily));} Build the table hadmin.createtable (TABLEDESC) According to the configured description; SYSTEM.OUT.PRINTLN ("CREATE TABLE" +tablename+ "Success!");}} Delete database table public static void Deletetable (String tableName) throws Exception {//Create a new database administrator hbaseadmin hadmin = new HBASEADMI N (Conf), if (Hadmin.tableexists (tableName)) {//Close a table hadmin.disabletable (tableName); hadmin.deletetable (TableName); System.out.println ("Delete table" +tablename+ "Success!" ");} else {System.out.println ("Deleted Tables" +tabLename+ "does not exist! "); System.exit (0);}} Add a data public static void AddRow (String tableName, String row,string columnfamily, string column, String value) throws E xception {htable table = new htable (conf, tableName); Put put = new put (bytes.tobytes (row));//Specify Rows//Parameters: Column family, column, Value Put.add (Bytes.tobytes (columnfamily), bytes.tobytes (column), Bytes.tobytes (value)); Table.put (put);} Delete a (row) data public static void Delrow (string tableName, String row) throws Exception {htable table = new htable (conf, tabl ename);D elete del = new Delete (bytes.tobytes (Row)); Table.delete (DEL);}  Delete multiple data public static void Delmultirows (String tableName, string[] rows) throws Exception {htable table = new Htable (conf, TableName); list<delete> dellist = new arraylist<delete> (); for (String row:rows) {Delete del = new Delete (Bytes.tobytes ( Row));d Ellist.add (del);} Table.delete (dellist);} Gets a data public static void GetRow (string tableName, String row) throws Exception {htable table = new htable (conf, Tablena ME); Get get = new GeT (bytes.tobytes (row)); Result result = Table.get (get);//output, raw method returns all KeyValue array for (KeyValue RowKV:result.raw ()) {System.out.print ("line name:" + N EW String (Rowkv.getrow ()) + ""); System.out.print ("timestamp:" + rowkv.gettimestamp () + ""); System.out.print ("Column family name:" + New String (rowkv.getfamily ()) + ""); System.out.print ("Column name:" + New String (Rowkv.getqualifier ()) + ""); System.out.println ("Value:" + New String (Rowkv.getvalue ()));}} Get all data public static void Getallrows (String tableName) throws Exception {htable table = new htable (conf, tableName); Scan scan = new scan (); Resultscanner results = Table.getscanner (scan);//output result for (result result:results) {for (KeyValue RowKV:result.raw ()) { System.out.print ("line name:" + New String (Rowkv.getrow ()) + ""); System.out.print ("timestamp:" + rowkv.gettimestamp () + ""); System.out.print ("Column family name:" + New String (rowkv.getfamily ()) + ""); System.out.print ("Column name:" + New String (Rowkv.getqualifier ()) + ""); System.out.println ("Value:" + New String (Rowkv.getvalue ()));}}} Main function public static VOID Main (string[] args) {try {String tableName = "student";//First step: Create database table: "Student" string[] Columnfamilys = {"Info", "Cour    Se "}; Hbasejavaapi.createtable (TableName, Columnfamilys);///Second step: Add data to data table//Add first row of data if (Isexist (TableName)) { Hbasejavaapi.addrow (TableName, "zpc", "info", "Age", "20"); Hbasejavaapi.addrow (TableName, "zpc", "info", "Sex", "boy"); Hbasejavaapi.addrow (TableName, "zpc", "Course", "China", "97"); Hbasejavaapi.addrow (TableName, "zpc", "Course", "math", "128"); Hbasejavaapi.addrow (TableName, "zpc", "course", "Chinese", "85");//Add a second row of data Hbasejavaapi.addrow (TableName, "Henjun", " Info "," Age "," 19 "); Hbasejavaapi.addrow (TableName, "<span style=" font-family:arial, Helvetica, Sans-serif; " >henjun</span> "," info "," Sex "," boy "); Hbasejavaapi.addrow (TableName, "Henjun", "Course", "China", "90"); Hbasejavaapi.addrow (TableName, "Henjun", "Course", "math", "120"); Hbasejavaapi.addrow (TableName, "Henjun", "Course", "中文版", "90");//Add third row of data Hbasejavaapi.addrow (TableName, "NiaopeNg "," info "," Age "," 18 "); Hbasejavaapi.addrow (TableName, "<span style=" font-family:arial, Helvetica, Sans-serif; " >niaopeng</span> "," info "," Sex "," girl "); Hbasejavaapi.addrow (TableName, "Niaopeng", "Course", "China", "100"); Hbasejavaapi.addrow (TableName, "Niaopeng", "Course", "math", "100"); Hbasejavaapi.addrow (TableName, "Niaopeng", "course", "Chinese", "99");//Step three: Get a data System.out.println ("************ * * Obtain a (ZPC) data ************* "); Hbasejavaapi.getrow (TableName, "zpc");//Fourth step: Get All Data System.out.println ("************** Get All Data ***************"); Hbasejavaapi.getallrows (tableName);///Fifth step: Delete a data System.out.println ("************ Delete A (zpc) data ************"); Hbasejavaapi.delrow (TableName, "zpc"); Hbasejavaapi.getallrows (tableName);///Sixth step: Delete multiple data System.out.println ("************** Delete multiple data ***************"); String rows[] = new string[] {"Qingqing", "Xiaoxue"}; Hbasejavaapi.delmultirows (tableName, rows); Hbasejavaapi.getallrows (tableName);///Seventh Step: Delete Database System.out.println ("*************** Delete database table **************"); Hbasejavaapi.deletetable (TableName); SYSTEM.OUT.PRINTLN (Does the table "+tablename+" exist? "+isexist (TableName));} else {System.out.println (tableName + "This database table does not exist!) ");}} catch (Exception e) {e.printstacktrace ();}}}

HBase Basic API (Java) operations (add and revise)