HBase Filter使用方法（一）

一、FilterList

 // 通過將operator參數設置爲Operator.MUST_PASS_ONE,達到list中各filter爲"或"的關係   or
 // 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);

二、幾大Filter

1、Comparision Filters

      1.1 RowFilter     √

1.2 FamilyFilter √

      1.3 QualifierFilter     √

      1.4 ValueFilter √

      1.5 DependentColumnFilter ×

2、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 ×

3、Decorating Filters

      3.1 SkipFilter ×

      3.2 WhileMatchFilters ×

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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 排除所有

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，不管用了？why--------

1.4   ValueFilter（同上）

1.5   DependentColumnFilter    未完待續！