Hbase 安装--7. 例子 PutExample

package Hbase_Master;   import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.hbase.HBaseConfiguration; import org.apache.hadoop.hbase.client.HTable; import org.apache.hadoop.hbase.client.Put; import org.apache.hadoop.hbase.util.Bytes; import java.io.IOException;       public class PutExample { public static void main(String[] args)throws IOException { Configuration conf= HBaseConfiguration.create(); // 创建配置文件   HTable table=new HTable(conf, "testtable");  // 创建 table   Put put= new Put(Bytes.toBytes("row1"));   // 创建 put实例，行key   put.add(Bytes.toBytes("colfam1"), Bytes.toBytes("qual1"), Bytes.toBytes("val1")); // 添加  colfam1:qual1 put.add(Bytes.toBytes("colfam1"), Bytes.toBytes("qual2"), Bytes.toBytes("val2")); // 添加 colfam1:qual2   table.put(put);   }   }

package util;   import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.hbase.HColumnDescriptor; import org.apache.hadoop.hbase.HTableDescriptor; import org.apache.hadoop.hbase.KeyValue; 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.util.Bytes;   import java.io.IOException; import java.util.ArrayList; import java.util.List; import java.util.Random;   /**  * Used by the book examples to generate tables and fill them with test data.  */ public class HBaseHelper {     private Configuration conf = null;   private HBaseAdmin admin = null;     protected HBaseHelper(Configuration conf) throws IOException {     this.conf = conf;     this.admin = new HBaseAdmin(conf);   }     public static HBaseHelper getHelper(Configuration conf) throws IOException {     return new HBaseHelper(conf);   }     public boolean existsTable(String table)   throws IOException {     return admin.tableExists(table);   }     public void createTable(String table, String... colfams)   throws IOException {     createTable(table, null, colfams);   }     public void createTable(String table, byte[][] splitKeys, String... colfams)   throws IOException {     HTableDescriptor desc = new HTableDescriptor(table);     for (String cf : colfams) {       HColumnDescriptor coldef = new HColumnDescriptor(cf);       desc.addFamily(coldef);     }     if (splitKeys != null) {       admin.createTable(desc, splitKeys);     } else {       admin.createTable(desc);     }   }     public void disableTable(String table) throws IOException {     admin.disableTable(table);   }     public void dropTable(String table) throws IOException {     if (existsTable(table)) {       disableTable(table);       admin.deleteTable(table);     }   }     public void fillTable(String table, int startRow, int endRow, int numCols,                         String... colfams)   throws IOException {     fillTable(table, startRow, endRow, numCols, -1, false, colfams);   }     public void fillTable(String table, int startRow, int endRow, int numCols,                         boolean setTimestamp, String... colfams)   throws IOException {     fillTable(table, startRow, endRow, numCols, -1, setTimestamp, colfams);   }     public void fillTable(String table, int startRow, int endRow, int numCols,                         int pad, boolean setTimestamp, String... colfams)   throws IOException {     fillTable(table, startRow, endRow, numCols, pad, setTimestamp, false, colfams);   }     public void fillTable(String table, int startRow, int endRow, int numCols,                         int pad, boolean setTimestamp, boolean random,                         String... colfams)   throws IOException {     HTable tbl = new HTable(conf, table);     Random rnd = new Random();     for (int row = startRow; row <= endRow; row++) {       for (int col = 0; col < numCols; col++) {         Put put = new Put(Bytes.toBytes("row-" + padNum(row, pad)));         for (String cf : colfams) {           String colName = "col-" + padNum(col, pad);           String val = "val-" + (random ?             Integer.toString(rnd.nextInt(numCols)) :             padNum(row, pad) + "." + padNum(col, pad));           if (setTimestamp) {             put.add(Bytes.toBytes(cf), Bytes.toBytes(colName),               col, Bytes.toBytes(val));           } else {             put.add(Bytes.toBytes(cf), Bytes.toBytes(colName),               Bytes.toBytes(val));           }         }         tbl.put(put);       }     }     tbl.close();   }     public String padNum(int num, int pad) {     String res = Integer.toString(num);     if (pad > 0) {       while (res.length() < pad) {         res = "0" + res;       }     }     return res;   }     public void put(String table, String row, String fam, String qual,                   String val) throws IOException {     HTable tbl = new HTable(conf, table);     Put put = new Put(Bytes.toBytes(row));     put.add(Bytes.toBytes(fam), Bytes.toBytes(qual), Bytes.toBytes(val));     tbl.put(put);     tbl.close();   }     public void put(String table, String row, String fam, String qual, long ts,                   String val) throws IOException {     HTable tbl = new HTable(conf, table);     Put put = new Put(Bytes.toBytes(row));     put.add(Bytes.toBytes(fam), Bytes.toBytes(qual), ts,             Bytes.toBytes(val));     tbl.put(put);     tbl.close();   }     public void put(String table, String[] rows, String[] fams, String[] quals,                   long[] ts, String[] vals) throws IOException {     HTable tbl = new HTable(conf, table);     for (String row : rows) {       Put put = new Put(Bytes.toBytes(row));       for (String fam : fams) {         int v = 0;         for (String qual : quals) {           String val = vals[v < vals.length ? v : vals.length - 1];           long t = ts[v < ts.length ? v : ts.length - 1];           put.add(Bytes.toBytes(fam), Bytes.toBytes(qual), t,             Bytes.toBytes(val));           v++;         }       }       tbl.put(put);     }     tbl.close();   }     public void dump(String table, String[] rows, String[] fams, String[] quals)   throws IOException {     HTable tbl = new HTable(conf, table);     List<Get> gets = new ArrayList<Get>();     for (String row : rows) {       Get get = new Get(Bytes.toBytes(row));       get.setMaxVersions();       if (fams != null) {         for (String fam : fams) {           for (String qual : quals) {             get.addColumn(Bytes.toBytes(fam), Bytes.toBytes(qual));           }         }       }       gets.add(get);     }     Result[] results = tbl.get(gets);     for (Result result : results) {       for (KeyValue kv : result.raw()) {         System.out.println("KV: " + kv +           ", Value: " + Bytes.toString(kv.getValue()));       }     }   } }