Changes between Initial Version and Version 1 of waue/2011/0426_4_3

Timestamp:

Apr 25, 2011, 3:54:50 PM (14 years ago)

Author:

waue

Comment:

--

waue/2011/0426_4_3

@@ +1 @@
+{{{
+#!html
+<div style="text-align: center; color:#151B8D"><big style="font-weight: bold;"><big><big>
+ITRI HBase 進階課程 
+</big></big></big></div> <div style="text-align: center; color:#7E2217"><big style="font-weight: bold;"><big>
+HBase 範例
+</big></big></div>
+}}}
+
+[wiki:waue/2011/0426_4_2 上一關 < ] 第三關 [wiki:waue/2011/0426_4_4 > 下一關] 
+
+ = 範例三： 取得 Column 的值 =
+
+{{{
+$ bin/hadoop jar ItriMenu.jar GetColumn "ex1Table" "row221" "Detail" "c1"
+}}}
+
+{{{
+#!java
+
+package itri;
+
+import java.io.IOException;
+
+import org.apache.hadoop.conf.Configuration;
+import org.apache.hadoop.hbase.HBaseConfiguration;
+import org.apache.hadoop.hbase.client.Get;
+import org.apache.hadoop.hbase.client.HTable;
+import org.apache.hadoop.hbase.client.Result;
+import org.apache.hadoop.hbase.util.Bytes;
+import org.apache.hadoop.util.GenericOptionsParser;
+
+public class GetColumn {
+
+        static String getColumn(String tablename, String row, String family,
+                        String column) {
+                HBaseConfiguration conf = new HBaseConfiguration();
+                String ret = "";
+
+                HTable table;
+                try {
+                        table = new HTable(conf, Bytes.toBytes(tablename));
+                        Get g = new Get(Bytes.toBytes(row));
+                        Result rowResult = table.get(g);
+                        ret = Bytes.toString(rowResult.getValue(Bytes.toBytes(family + ":"
+                                        + column)));
+
+                        table.close();
+                } catch (IOException e) {
+
+                        e.printStackTrace();
+                }
+
+                return ret;
+        }
+
+        public static void main(String[] argv) {
+//              String[] argc = {"t1","r1","f1","c1"};argv = argc;
+                String[] args = new GenericOptionsParser(new Configuration(), argv)
+                                .getRemainingArgs();
+                if (args.length < 4) {
+                        System.out.println("GetColumn <TableName> <Row> <Family> <Qualifier> ");
+                        return;
+                }
+                System.out.println(getColumn(args[0], args[1], args[2], args[3]));
+        }
+}
+
+}}}
+
+ * 執行結果
+
+{{{
+my value good
+}}}