Comparison Filter： 对比过滤器：
1.RowFilter
select * from ns1:t1 where rowkey <= row100
/**
* 测试缓存和批处理
*/
@Test
public void testBatchAndCaching() throws IOException {
Configuration conf = HBaseConfiguration.create();
Connection conn = ConnectionFactory.createConnection(conf);
TableName tname = TableName.valueOf("ns1:t7");
Scan scan = new Scan();
scan.setCaching(2);
scan.setBatch(4);
Table t = conn.getTable(tname);
ResultScanner rs = t.getScanner(scan);
Iterator<Result> it = rs.iterator();
while (it.hasNext()) {
Result r = it.next();
System.out.println("========================================");
//得到一行的所有map,key=f1,value=Map<Col,Map<Timestamp,value>>
NavigableMap<byte[], NavigableMap<byte[], NavigableMap<Long, byte[]>>> map = r.getMap();
//
for (Map.Entry<byte[], NavigableMap<byte[], NavigableMap<Long, byte[]>>> entry : map.entrySet()) {
//得到列族
String f = Bytes.toString(entry.getKey());
Map<byte[], NavigableMap<Long, byte[]>> colDataMap = entry.getValue();
for (Map.Entry<byte[], NavigableMap<Long, byte[]>> ets : colDataMap.entrySet()) {
String c = Bytes.toString(ets.getKey());
Map<Long, byte[]> tsValueMap = ets.getValue();
for (Map.Entry<Long, byte[]> e : tsValueMap.entrySet()) {
Long ts = e.getKey();
String value = Bytes.toString(e.getValue());
System.out.print(f + "/" + c + "/" + ts + "=" + value + ",");
}
}
}
System.out.println();
}
}
/**
* 测试RowFilter过滤器
*/
@Test
public void testRowFilter() throws IOException {
Configuration conf = HBaseConfiguration.create();
Connection conn = ConnectionFactory.createConnection(conf);
TableName tname = TableName.valueOf("ns1:t1");
Scan scan = new Scan();
RowFilter rowFilter = new RowFilter(CompareFilter.CompareOp.LESS_OR_EQUAL, new BinaryComparator(Bytes.toBytes("row0100")));
scan.setFilter(rowFilter);
Table t = conn.getTable(tname);
ResultScanner rs = t.getScanner(scan);
Iterator<Result> it = rs.iterator();
while (it.hasNext()) {
Result r = it.next();
System.out.println(Bytes.toString(r.getRow()));
}
}
/**
* 测试FamilyFilter过滤器
*/
@Test
public void testFamilyFilter() throws IOException {
Configuration conf = HBaseConfiguration.create();
Connection conn = ConnectionFactory.createConnection(conf);
TableName tname = TableName.valueOf("ns1:t7");
Scan scan = new Scan();
FamilyFilter filter = new FamilyFilter(CompareFilter.CompareOp.LESS, new BinaryComparator(Bytes.toBytes("f2")));
scan.setFilter(filter);
Table t = conn.getTable(tname);
ResultScanner rs = t.getScanner(scan);
Iterator<Result> it = rs.iterator();
while (it.hasNext()) {
Result r = it.next();
byte[] f1id = r.getValue(Bytes.toBytes("f1"), Bytes.toBytes("id"));
byte[] f2id = r.getValue(Bytes.toBytes("f2"), Bytes.toBytes("id"));
System.out.println(f1id + " : " + f2id);
}
}
/**
* 测试QualifierFilter(列过滤器)
*/
@Test
public void testColFilter() throws IOException {
Configuration conf = HBaseConfiguration.create();
Connection conn = ConnectionFactory.createConnection(conf);
TableName tname = TableName.valueOf("ns1:t7");
Scan scan = new Scan();
QualifierFilter colfilter = new QualifierFilter(CompareFilter.CompareOp.EQUAL, new BinaryComparator(Bytes.toBytes("id")));
scan.setFilter(colfilter);
Table t = conn.getTable(tname);
ResultScanner rs = t.getScanner(scan);
Iterator<Result> it = rs.iterator();
while (it.hasNext()) {
Result r = it.next();
byte[] f1id = r.getValue(Bytes.toBytes("f1"), Bytes.toBytes("id"));
byte[] f2id = r.getValue(Bytes.toBytes("f2"), Bytes.toBytes("id"));
byte[] f2name = r.getValue(Bytes.toBytes("f2"), Bytes.toBytes("name"));
System.out.println(f1id + " : " + f2id + " : " + f2name);
}
}
/**
* 测试ValueFilter(值过滤器)
* 过滤value的值，含有指定的字符子串
*/
@Test
public void testValueFilter() throws IOException {
Configuration conf = HBaseConfiguration.create();
Connection conn = ConnectionFactory.createConnection(conf);
TableName tname = TableName.valueOf("ns1:t7");
Scan scan = new Scan();
ValueFilter filter = new ValueFilter(CompareFilter.CompareOp.EQUAL, new SubstringComparator("to"));
scan.setFilter(filter);
Table t = conn.getTable(tname);
ResultScanner rs = t.getScanner(scan);
Iterator<Result> it = rs.iterator();
while (it.hasNext()) {
Result r = it.next();
byte[] f1id = r.getValue(Bytes.toBytes("f1"), Bytes.toBytes("id"));
byte[] f2id = r.getValue(Bytes.toBytes("f2"), Bytes.toBytes("id"));
byte[] f1name = r.getValue(Bytes.toBytes("f1"), Bytes.toBytes("name"));
byte[] f2name = r.getValue(Bytes.toBytes("f2"), Bytes.toBytes("name"));
System.out.println(f1id + " : " + f2id + " : " + Bytes.toString(f1name) + " : " + Bytes.toString(f2name));
}
}
/**
* DependentColumnFilter 依赖列过滤器 自定义一种过滤基数
*/
@Test
public void testDepFilter() throws IOException {
Configuration conf = HBaseConfiguration.create();
Connection conn = ConnectionFactory.createConnection(conf);
TableName tname = TableName.valueOf("ns1:t7");
Scan scan = new Scan();
DependentColumnFilter filter = new DependentColumnFilter(Bytes.toBytes("f2"),
Bytes.toBytes("addr"),
true,
CompareFilter.CompareOp.NOT_EQUAL,
new BinaryComparator(Bytes.toBytes("beijing"))
);
scan.setFilter(filter);
Table t = conn.getTable(tname);
ResultScanner rs = t.getScanner(scan);
Iterator<Result> it = rs.iterator();
while (it.hasNext()) {
Result r = it.next();
byte[] f1id = r.getValue(Bytes.toBytes("f1"), Bytes.toBytes("id"));
byte[] f2id = r.getValue(Bytes.toBytes("f2"), Bytes.toBytes("id"));
byte[] f1name = r.getValue(Bytes.toBytes("f1"), Bytes.toBytes("name"));
byte[] f2name = r.getValue(Bytes.toBytes("f2"), Bytes.toBytes("name"));
System.out.println(f1id + " : " + f2id + " : " + Bytes.toString(f1name) + " : " + Bytes.toString(f2name));
}
}
/**
* 单列值value过滤， 和值过滤器对比看
* 如果value不满足，整行滤掉
*/
@Test
public void testSingleColumValueFilter() throws IOException {
Configuration conf = HBaseConfiguration.create();
Connection conn = ConnectionFactory.createConnection(conf);
TableName tname = TableName.valueOf("ns1:t7");
Scan scan = new Scan();
SingleColumnValueFilter filter = new SingleColumnValueFilter(Bytes.toBytes("f2",
Bytes.toBytes("name"),
CompareFilter.CompareOp.NOT_EQUAL),
new BinaryComparator(Bytes.toBytes("tom2.1")));
//ValueFilter filter = new ValueFilter(CompareFilter.CompareOp.EQUAL, new SubstringComparator("to"));
scan.setFilter(filter);
Table t = conn.getTable(tname);
ResultScanner rs = t.getScanner(scan);
Iterator<Result> it = rs.iterator();
while (it.hasNext()) {
Result r = it.next();
byte[] f1id = r.getValue(Bytes.toBytes("f1"), Bytes.toBytes("id"));
byte[] f2id = r.getValue(Bytes.toBytes("f2"), Bytes.toBytes("id"));
byte[] f1name = r.getValue(Bytes.toBytes("f1"), Bytes.toBytes("name"));
byte[] f2name = r.getValue(Bytes.toBytes("f2"), Bytes.toBytes("name"));
System.out.println(f1id + " : " + f2id + " : " + Bytes.toString(f1name) + " : " + Bytes.toString(f2name));
}
}
复杂查询 like
-----------------
如 sql： select * from t7 where ((age <= 13) and (name like '%t') or (age > 13) and (name like 't%'))
FilterList
----------------
@Test
public void testComboFilter() throws IOException {
Configuration conf = HBaseConfiguration.create();
Connection conn = ConnectionFactory.createConnection(conf);
TableName tname = TableName.valueOf("ns1:t7");
Scan scan = new Scan();
//where ... f2:age <= 13
SingleColumnValueFilter ftl = new SingleColumnValueFilter(
Bytes.toBytes("f2"),
Bytes.toBytes("age"),
CompareFilter.CompareOp.LESS_OR_EQUAL,
new BinaryComparator(Bytes.toBytes("13"))
);
//where ... f2:name like %t
SingleColumnValueFilter ftr = new SingleColumnValueFilter(
Bytes.toBytes("f2"),
Bytes.toBytes("name"),
CompareFilter.CompareOp.EQUAL,
new RegexStringComparator("^t")
);
//ft
FilterList ft = new FilterList(FilterList.Operator.MUST_PASS_ALL);
ft.addFilter(ftl);
ft.addFilter(ftr);
//where ... f2:age > 13
SingleColumnValueFilter fbl = new SingleColumnValueFilter(
Bytes.toBytes("f2"),
Bytes.toBytes("age"),
CompareFilter.CompareOp.GREATER,
new BinaryComparator(Bytes.toBytes("13"))
);
//where ... f2:name like %t
SingleColumnValueFilter fbr = new SingleColumnValueFilter(
Bytes.toBytes("f2"),
Bytes.toBytes("name"),
CompareFilter.CompareOp.EQUAL,
new RegexStringComparator("t$")
);
//ft
FilterList fb = new FilterList(FilterList.Operator.MUST_PASS_ALL);
fb.addFilter(fbl);
fb.addFilter(fbr);
FilterList fall = new FilterList(FilterList.Operator.MUST_PASS_ONE);
fall.addFilter(ft);
fall.addFilter(fb);
scan.setFilter(fall);
Table t = conn.getTable(tname);
ResultScanner rs = t.getScanner(scan);
Iterator<Result> it = rs.iterator();
while (it.hasNext()) {
Result r = it.next();
byte[] f1id = r.getValue(Bytes.toBytes("f1"), Bytes.toBytes("id"));
byte[] f2id = r.getValue(Bytes.toBytes("f2"), Bytes.toBytes("id"));
byte[] f1name = r.getValue(Bytes.toBytes("f1"), Bytes.toBytes("name"));
byte[] f2name = r.getValue(Bytes.toBytes("f2"), Bytes.toBytes("name"));
System.out.println(f1id + " : " + f2id + " : " + Bytes.toString(f1name) + " : " + Bytes.toString(f2name));
}
}
分页过滤器：
列分页过滤:
select "fl:name"
keyOnly过滤器 ，只提取key 。丢弃value；
hbase的api操作之过滤器
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转载自www.cnblogs.com/zyanrong/p/10753819.html
周排行