HBase Filter使用方法（一）

1、FilterList

1:經過將operator參數設置爲Operator.MUST_PASS_ONE,達到list中各filter爲"或"的關係   or

2:默認operator參數的值爲Operator.MUST_PASS_ALL,即list中各filter爲"並"的關係       and

FilterList f=new FilterList(FilterList.Operator.MUST_PASS_ONE);

2、幾大Filter

一、Comparision Filters

      1.1 RowFilter     √

1.2 FamilyFilter √

      1.3 QualifierFilter      √

      1.4 ValueFilter √

      1.5 DependentColumnFilter ×

二、Dedicated Filters

      2.1 SingleColumnValueFilter ×

      2.2 SingleColumnValueExcludeFilter ×

      2.3 PrefixFilter ×

      2.4 PageFilter ×

      2.5 KeyOnlyFilter ×

      2.6 FirstKeyOnlyFilter ×

      2.7 TimestampsFilter ×

      2.8 RandomRowFilter ×

三、Decorating Filters

      3.1 SkipFilter ×

      3.2 WhileMatchFilters ×

1.1   RowFilter  

格式：RowFilter(CompareFilter.CompareOp rowCompareOp, ByteArrayComparable rowComparator)

 

參數一  Operator Description

 

LESS 小於

LESS_OR_EQUAL 小於等於

EQUAL 等於

NOT_EQUAL 不等於

GREATER_OR_EQUAL 大於等於

GREATER 大於

NO_OP 排除全部

 

參數二  ByteArrayComparable  可用

BinaryComparator, BinaryPrefixComparator, BitComparator, LongComparator, NullComparator, RegexStringComparator, SubstringComparator

 

例子：Filter filter=new RowFilter(CompareOp.EQUAL, new BinaryComparator(Bytes.toBytes(RowKey))

 

相關的過濾方法使用:

提取rowkey以01結尾數據--正則表達式

Filter filter = new RowFilter(CompareFilter.CompareOp.EQUAL,new RegexStringComparator(".*01$"));

 

提取rowkey以包含201407的數據

Filter filter = new RowFilter(CompareFilter.CompareOp.EQUAL,new SubstringComparator("201407"));

 

 

提取rowkey以123開頭的數據

Filter filter = new RowFilter(CompareFilter.CompareOp.EQUAL,new BinaryPrefixComparator("123".getBytes()));

 

 

提取rowkey小於等於row010的行

Filter filter1 = new RowFilter(CompareFilter.CompareOp.LESS_OR_EQUAL,new BinaryComparator("row010".getBytes()));

 1.2   FamilyFilter（同上）

1.3   QualifierFilter（同上）--------當列爲數字，無論用了？why--------

1.4   ValueFilter（同上）

1.5   DependentColumnFilter    未完待續！