HBase Filter使用方法（一） - 关系型数据库

一、FilterList

 // 通过将operator参数设置为Operator.MUST_PASS_ONE,达到list中各filter为"或"的关系   or
 // 默认operator参数的值为Operator.MUST_PASS_ALL,即list中各filter为"并"的关系       and
    FilterList f=new FilterList(FilterList.Operator.MUST_PASS_ONE);

二、几大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 ×

1.1   RowFilter  

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

参数一  Operator Description

LESS 小于

LESS_OR_EQUAL 小于等于

EQUAL 等于

NOT_EQUAL 不等于

GREATER_OR_EQUAL 大于等于

GREATER 大于

NO_OP 排除所有

参数二  ByteArrayComparable  可用

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

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

相关的过滤方法使用:

提取rowkey以01结尾数据–正则表达式

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

提取rowkey以包含201407的数据

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

提取rowkey以123开头的数据

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

提取rowkey小于等于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）——–当列为数字，不管用了？why——–

1.4   ValueFilter（同上）

1.5   DependentColumnFilter    未完待续！