HBase表A有一个列族"info”,2个列为“info:name”、“info:age”,补全代码,实现查询name为“XiaoMing”的数据。 table = conn.getTable(tableName); Scan scan = new Scan();
时间: 2024-05-21 20:10:56 浏览: 10
Filter filter = new SingleColumnValueFilter(Bytes.toBytes("info"), Bytes.toBytes("name"), CompareOperator.EQUAL, Bytes.toBytes("XiaoMing")); scan.setFilter(filter); ResultScanner scanner = table.getScanner(scan); for (Result result : scanner) { System.out.println(Bytes.toString(result.getValue(Bytes.toBytes("info"), Bytes.toBytes("name"))) + " " + Bytes.toString(result.getValue(Bytes.toBytes("info"), Bytes.toBytes("age")))); } scanner.close();
相关问题
HBase表A有一个列族"info”,2个列为“info:name”、“info:age”,补全代码,实现查询name为“XiaoMing”的数据
以下是Java代码示例:
```
Configuration conf = HBaseConfiguration.create();
Connection connection = ConnectionFactory.createConnection(conf);
Table table = connection.getTable(TableName.valueOf("A"));
Scan scan = new Scan();
Filter filter = new SingleColumnValueFilter(Bytes.toBytes("info"), Bytes.toBytes("name"), CompareOperator.EQUAL, Bytes.toBytes("XiaoMing"));
scan.setFilter(filter);
ResultScanner scanner = table.getScanner(scan);
for (Result result : scanner) {
byte[] nameValue = result.getValue(Bytes.toBytes("info"), Bytes.toBytes("name"));
byte[] ageValue = result.getValue(Bytes.toBytes("info"), Bytes.toBytes("age"));
String name = Bytes.toString(nameValue);
String age = Bytes.toString(ageValue);
System.out.println("Name: " + name + ", Age: " + age);
}
table.close();
connection.close();
```
这段代码使用HBase Java API查询表A中列族为"info",列名为"name",值为"XiaoMing"的数据。通过Scan对象设置过滤器,使用SingleColumnValueFilter来指定列族、列名和比较运算符,最后通过ResultScanner遍历查询结果,输出name和age的值。
HBase表A有一个列族"info",2个列为"info:name"、"info:age", table = conn.getTable(tableName); Scan scan = new Scan(); 补全上述代码,实现查询name为"XiaoMing"的数据
以下是补全的代码:
```
table = conn.getTable(tableName);
Scan scan = new Scan();
Filter filter = new SingleColumnValueFilter(Bytes.toBytes("info"), Bytes.toBytes("name"), CompareOperator.EQUAL, Bytes.toBytes("XiaoMing"));
scan.setFilter(filter);
ResultScanner scanner = table.getScanner(scan);
for (Result result : scanner) {
String name = Bytes.toString(result.getValue(Bytes.toBytes("info"), Bytes.toBytes("name")));
String age = Bytes.toString(result.getValue(Bytes.toBytes("info"), Bytes.toBytes("age")));
System.out.println("Name: " + name + ", Age: " + age);
}
scanner.close();
```
以上代码使用了单列值过滤器(SingleColumnValueFilter),过滤条件为列族为"info",列名为"name",值为"XiaoMing"。查询结果会打印出符合条件的行的"name"和"age"列的值。