Changes between Version 2 and Version 3 of waue/2010/0402

Timestamp:

Apr 22, 2010, 10:50:33 AM (16 years ago)

Author:

waue

Comment:

--

waue/2010/0402

@@ -9 +9 @@
 [[PageOutline]]
  = 零、前言 =
+
+ * thrift 是透過非java的其他程式語言，直接對hbase 進行存取的中介函式庫
+ * ''''' 此篇介紹的是如何用php透過 thrift 對 hbase 操作 '''''
+
  * 程式安裝測試方法已紀錄於： [wiki:waue/2010/0401 安裝編譯及測試 ]
  * 因此目錄結構為
- || hadoop || /opt/hadoop ||  ||
- || hbase || /opt/hbase ||  ||
- || 網頁根目錄 || /var/www/ ||  ||
- || hbase 的php碼目錄 || /var/www/hbase ||  ||
- || thrift php || /var/www/hbase/thrift ||  ||
+
+ || hadoop || /opt/hadoop ||  
+ || hbase || /opt/hbase ||  
+ || 網頁根目錄 || /var/www/ ||  
+ || hbase 的php碼目錄 || /var/www/hbase ||  
+ || thrift php || /var/www/hbase/thrift ||  
 
  * 測試程式之前，請先確定
@@ -43 +48 @@
 ?>
 ........
-其他程式碼
+其他html 碼
+<?
+或是 下面提到的各式讀寫操作
+
+?>
 .......
 <?
@@ -50 +59 @@
 }}}
 
-
-
+ * 所有的程式碼都必須包含這些引入函式庫、開啟關閉socket 的敘述
+
+ = 二、各種對hbase的操作 =  
+
+ == 2.1 列出hbase 裡的所有 table == 
+{{{
+!#php
+echo( "listing tables...\n" );
+$tables = $client->getTableNames();
+sort( $tables );
+foreach ( $tables as $name ) {
+  echo( "  found: {$name}\n" );
+}
+}
+}}}
+ == 2.2 刪除table == 
+{{{
+!#php
+$name = "hbase table name";
+if ($client->isTableEnabled( $name )) {
+      echo( "    disabling table: {$name}\n");
+      $client->disableTable( $name );
+}
+echo( "    deleting table: {$name}\n" );
+    $client->deleteTable( $name );
+}
+}}}
+ == 2.3 新增table == 
+
+ * 我們先定義columns 的物件結構如下
+{{{
+!#php
+$columns = array(
+  new ColumnDescriptor( array(
+    'name' => 'entry:',
+    'maxVersions' => 10
+  ) ),
+  new ColumnDescriptor( array(
+    'name' => 'unused:'
+  ) )
+);
+}}}
+
+ * 將剛剛的column 放到table 內
+{{{
+!#php
+$t = "table name";
+echo( "creating table: {$t}\n" );
+
+try {
+  $client->createTable( $t, $columns );
+} catch ( AlreadyExists $ae ) {
+  echo( "WARN: {$ae->message}\n" );
+}
+
+}}}
+ == 2.4 列出 table內的家族成員 family == 
+{{{
+!#php
+$t = "table name";
+echo( "column families in {$t}:\n" );
+
+$descriptors = $client->getColumnDescriptors( $t );
+asort( $descriptors );
+foreach ( $descriptors as $col ) {
+  echo( "  column: {$col->name}, maxVer: {$col->maxVersions}\n" );
+}
+}}}
+ == 2.5 寫入資料 == 
+{{{
+!#php
+$t = "table name";
+$row = "row name"
+$valid = "foobar-\xE7\x94\x9F\xE3\x83\x93";
+
+$mutations = array(
+  new Mutation( array(
+    'column' => 'entry:foo',
+    'value' => $valid
+  ) ),
+);
+
+$client->mutateRow( $t, $row, $mutations );
+}}}
+
+ == 2.6 讀取資料 == 
+ === get  取得一個 column value ===
+ * get  取得一個 column value 的用法
+
+$table_name = 't1';
+$row_name = '1';
+$fam_col_name = 'f1:c1';
+
+        $arr = $client->get($table_name, $row_name , $fam_col_name);
+        // $arr = array
+        foreach ( $arr as $k=>$v  ) {
+                // $k = TCell
+                echo ("value = {$v->value} , <br>  "); 
+                echo ("timestamp = {$v->timestamp}  <br>");
+        }
+}
+
+ ===  getRow 取得一整個row ===
+ * getRow($tableName, $row) 用法
+{{{
+#!php
+$table_name = "table name";
+$row_name = "row name";
+
+$arr = $client->getRow($table_name, $row_name);
+// $client->getRow return a array
+foreach ( $arr as $k=>$TRowResult  ) {
+                // $k = 0 ; non-use
+                // $TRowResult = TRowResult
+                printTRowResult($TRowResult);
+}
+}}}
+
+ ===  scan 一整個table ===
+
+{{{
+!#php
+$table_name = 't1';
+$start_row = ""; // 從row 的起點開始
+$family = array( "f1","f2","f3" );
+
+
+$scanner = $client->scannerOpen( $table_name, $start_row , $family );
+// $scanner 是一個遞增數字 for open socket
+// scannerGet() 一次只抓一row，因此要用while迴圈不斷地抓
+while (true ){
+                $get_arr = $client->scannerGet( $scanner );
+                // get_arr is an array
+
+                if($get_arr == null) break;
+                // 沒有回傳值代表已經沒有資料可抓，跳脫此無限迴圈
+
+                foreach ( $get_arr as $TRowResult ){
+                        // $TRowResult = TRowResult
+                        echo (" row = {$TRowResult->row} ; <br> ");
+                        $column = $TRowResult->columns;
+                        foreach ($column as $family_column=>$Tcell){
+                                        echo ("family:column = $family_column ");
+                                        // $family_column = family_column
+                                        // $Tcell = Tcell
+                                        echo (" value = {$Tcell->value} ");
+                                        echo (" timestamp = {$Tcell->timestamp}  <br>");
+                        }
+                }
+}
+echo( "<br> ----------------- " );
+echo( "<br> Scanner finished <br>" );
+$client->scannerClose( $scanner );
+
+}}}