aerospike key 说明
所属分类 aerospike
浏览量 1814
aerospike默认不会存原始key
aerospike-client-4.0.8.jar
com.aerospike.client.Key
public final class Key {
// Namespace. Equivalent to database name.
public final String namespace;
// Optional set name. Equivalent to database table.
public final String setName;
// Unique server hash value generated from set name and user key.
public final byte[] digest;
// Original user key. This key is immediately converted to a hash digest.
// This key is not used or returned by the server by default.
public final Value userKey;
public Key(String namespace, String setName, String key) throws AerospikeException {
this.namespace = namespace;
this.setName = setName;
this.userKey = new Value.StringValue(key);
digest = computeDigest(setName, this.userKey);
}
保存原始key可以使用两种方式
Set "WritePolicy.sendKey" to true.
In this case, the key will be sent to the server for storage on writes
and retrieved on multi-record scans and queries.
设置 WritePolicy.sendKey 为 true
Explicitly store and retrieve the key in a bin
把key写入到某个列
public static byte[] computeDigest(String setName, Value key) throws AerospikeException
Generate unique server hash value from set name, key type and user defined key.
The hash function is RIPEMD-160 (a 160 bit hash).
160位的hash值
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