Hbase常用操作记录

Hbase

创建表

语法：create <table>, {NAME => <family>, VERSIONS => <VERSIONS>}

例如：创建表t1，有两个family name：f1，f2，且版本数均为2

create \'table\',{NAME => \'family1\', VERSIONS => 2,TTL=>\'100000\'},{NAME => \'family2\', VERSIONS => 2,TTL=>\'100000\'}

查看表结构

describe <table>

修改表结构

disable \'table\'

alter \'table\',{NAME=>\'info\',TTL=>\'100000\'}

enable \'table\'

删除表

disable \'table\'

drop \'table\'

统计行数 hbase org.apache.hadoop.hbase.mapreduce.RowCounter \'tablename\'

添加数据 put \'table\',\'rowkey\',\'family:column\',\'value\'

查询表中的数据行数 count \'table\', {INTERVAL => 100, CACHE => 500}

删除数据

删除行中的某个列值 delete \'table\',\'rowkey\',\'family:column\'

删除行 deleteall \'table\',\'rowkey\'

删除表中的所有数据 truncate \'table\'

rowkey中包含某关键字

BinaryComparator-使用Bytes.compareTo()比较
BinaryPrefixComparator-和BinaryComparator差不多，从前面开始比较
NullComparator-Does not compare against an actual value but whether a given one is null, or not null.
BitComparator-Performs a bitwise comparison, providing a BitwiseOp class with AND, OR, and XOR operators.
RegexStringComparator-正则表达式
SubstringComparator-把数据当成字符串，用contains()来判断

import org.apache.hadoop.hbase.filter.CompareFilter

import org.apache.hadoop.hbase.filter.需要使用的过滤器

提取rowkey以01结尾数据

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())))

import org.apache.hadoop.hbase.filter.RowFilter

scan \'table\',FILTER => RowFilter.new(CompareFilter::CompareOp.valueOf(\'EQUAL\'),SubstringComparator.new(\'KEY\'))

以某关键字开头

scan \'table\', FILTER => "PrefixFilter (\'关键字\')"

根据column family value查询包含某一关键字的数据

scan \'table\', FILTER=>"ColumnPrefixFilter(\'family:column\') AND ( ValueFilter(=,\'substring:关键字1\') OR ValueFilter(=,\'substring:关键字2\') )"

查询值等于某一关键字的数据

scan \'table\', FILTER=>"ValueFilter(=,\'binary:关键字\')"