Changes between Initial Version and Version 1 of NCHCCloudCourse100929_4_HBEX4

Timestamp:

Sep 27, 2010, 6:26:39 PM (15 years ago)

Author:

waue

Comment:

--

NCHCCloudCourse100929_4_HBEX4

@@ +1 @@
+{{{
+#!html
+<div style="text-align: center; color:#151B8D"><big style="font-weight: bold;"><big><big>
+HBase 進階課程 
+</big></big></big></div> <div style="text-align: center; color:#7E2217"><big style="font-weight: bold;"><big>
+程式範例練習
+</big></big></div>
+}}}
+
+[wiki:NCHCCloudCourse100929_4_HBEX3 上一關 < ] 第四關 [wiki:NCHCCloudCourse100929_4_HBEX5 > 下一關]
+
+ = 範例四： Scan all Column = 
+
+{{{
+#!java
+package org.nchc.hbase;
+
+import java.io.IOException;
+
+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.Result;
+import org.apache.hadoop.hbase.client.ResultScanner;
+import org.apache.hadoop.hbase.util.Bytes;
+import org.apache.hadoop.util.GenericOptionsParser;
+
+public class ScanTable {
+
+        static void ScanColumn(String tablename, String family, String column) {
+                HBaseConfiguration conf = new HBaseConfiguration();
+
+                HTable table;
+                try {
+                        table = new HTable(conf, Bytes.toBytes(tablename));
+
+                        ResultScanner scanner = table.getScanner(Bytes.toBytes(family));
+
+                        System.out.println("Scan the Table [" + tablename
+                                        + "]'s Column => " + family + ":" + column);
+                        int i = 1;
+                        for (Result rowResult : scanner) {
+                                byte[] by = rowResult.getValue(Bytes.toBytes(family), Bytes
+                                                .toBytes(column));
+                                String str = Bytes.toString(by);
+                                System.out.println("row " + i + " is \"" + str + "\"");
+                                i++;
+                        }
+                } catch (IOException e) {
+                        e.printStackTrace();
+                }
+        }
+
+        public static void main(String[] argv) {
+                String[] args = new GenericOptionsParser(new Configuration(), argv)
+                                .getRemainingArgs();
+                if (args.length < 3) {
+                        System.out
+                                        .println("ScanColumn <TableName> <Family> <Qualifier> ");
+                        return;
+                }
+                ScanColumn(args[0], args[1], args[2]);
+        }
+}
+
+}}}
+
+