當我們想將 python 透過 HappyBase scan function 取得的 HBase Table scan resualt，
呈現在網頁上時
Example: 'pytest' Table
RowKey f:id
"John" "a"
"Mary" "b"
"Tom" "c"
views.py (回傳 HBase scan result 給 detail.html)
connection = happybase.Connection('192.168.0.7')
connection.open()
使用HappyHBase連結到HBase(實際上是連結到Zookeeper，尚不知為何不用設定zookeeper的Port)
table = connection.table('pytest')
result = table.scan(columns=['f:id'], filter="SingleColumnValueFilter('f', 'id', !=, 'binary:a')")
對HBase上的 "pytest" Table 做 scan，篩選出 'f:id'不等於"a" 的row，並只回傳row的 id那欄
template = loader.get_template('app1/detail.html')
context = Context({'messages': result, })
return HttpResponse(template.render(context))
將result回傳包成HttpResponse，並回傳給指定的html template
-----------------HTML 顯示方法 1 ---------------------
若直接在html中顯示值:
detail.html
Example: 'pytest' Table
RowKey f:id
"John" "a"
"Mary" "b"
"Tom" "c"
views.py (回傳 HBase scan result 給 detail.html)
...
connection = happybase.Connection('192.168.0.7')
connection.open()
table = connection.table('pytest')
result = table.scan(columns=['f:id'], filter="SingleColumnValueFilter('f', 'id', !=, 'binary:a')")
template = loader.get_template('app1/detail.html')
context = Context({'messages': result, })
return HttpResponse(template.render(context))
...
connection = happybase.Connection('192.168.0.7')
connection.open()
table = connection.table('pytest')
result = table.scan(columns=['f:id'], filter="SingleColumnValueFilter('f', 'id', !=, 'binary:a')")
template = loader.get_template('app1/detail.html')
context = Context({'messages': result, })
return HttpResponse(template.render(context))
...
connection = happybase.Connection('192.168.0.7')
connection.open()
使用HappyHBase連結到HBase(實際上是連結到Zookeeper，尚不知為何不用設定zookeeper的Port)
table = connection.table('pytest')
result = table.scan(columns=['f:id'], filter="SingleColumnValueFilter('f', 'id', !=, 'binary:a')")
對HBase上的 "pytest" Table 做 scan，篩選出 'f:id'不等於"a" 的row，並只回傳row的 id那欄
template = loader.get_template('app1/detail.html')
context = Context({'messages': result, })
return HttpResponse(template.render(context))
將result回傳包成HttpResponse，並回傳給指定的html template
-----------------HTML 顯示方法 1 ---------------------
若直接在html中顯示值:
detail.html
{% for v in messages %}
{{v}}
<br>
{% endfor %}
{{v}}
<br>
{% endfor %}
會顯示
('Mary', {'f:id': 'b'})
('Tom', {'f:id': 'c'})
(X1,X2, ...) => python的 Tuple 型態
{a1:b1, a2:b2, ...} => python的 Dictionary型態(類似java的Map)
--------------------------------------------
--------------------------------------------
----------------HTML 顯示方法 2 -------------------
但如果我們只需要呈現 rowkey以及 id的值 則必須
在views.py中再加入
@register.filter
def get_item(dictionary, key):
return dictionary.get(key)
def get_item(dictionary, key):
return dictionary.get(key)
並且於 detail.html中加入
就會顯示
Mary b
Tom c
--------------------------------------------
{% for k, v in messages %} <-- k, v對應tuple中的兩個值
{{ k }}
{% for id in v %}
{{ v | get_item:id }} <-- Dictionary type的只能用這種方式取值
{% endfor %}
{% endfor %}
{{ k }}
{% for id in v %}
{{ v | get_item:id }} <-- Dictionary type的只能用這種方式取值
{% endfor %}
{% endfor %}
就會顯示
Mary b
Tom c
--------------------------------------------
