php HandlerSocket的使用

SQL原型：INSERT INTO test.t (id, a, b) VALUES (1, ‘a1′, ‘b1′), (2, ‘a2′, ‘b2′)

shell> telnet localhost 9999
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
P    1    test  t    PRIMARY id,a,b
0    1
1    +    3    1    a1   b1
0    1    0
1    +    3    2    a2   b2
0    1    0

注：使用HandlerSocket时，因为没有实际运行SQL，所以Binlog记录的是Row格式。

SQL原型：SELECT id, a, b FROM test.t WHERE id = 1 LIMIT 1

shell> telnet localhost 9999
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
P    1    test  t    PRIMARY id,a,b
0    1
1    =    1    1    1    0
0    3    1    a1   b1

SQL原型：SELECT id, a, b FROM test.t WHERE id >=1 LIMIT 2

shell> telnet localhost 9999
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
P    1    test  t    PRIMARY id,a,b
0    1
1    >=   1    1    2    0
0    3    1    a1   b1   2    a2   b2

SQL原型：SELECT id, a, b FROM test.t WHERE a = ‘a1′ AND b = ‘b1′ LIMIT 1

shell> telnet localhost 9999
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
P    1    test  t    a_b   id,a,b
0    1
1    =    2    a1   b1   1    0
0    3    1    a1   b1

对HandlerSocket一个常见的误解是只能执行PRIMARY类型的KV查询，实际上只要支持索引，一般的简单查询它都能胜任，篇幅所限，这里就不多说了，如果你觉得直接操作telnet有些吃力，也可以使用自己熟悉的客户端来测试，官方文档里有介绍。

注：HandlerSocket作者写了一个不错的PPT可以参考：HandlerSocket plugin for MySQL

记：MySQL5.6提供原生的Memcached API，实际就是KV型NoSQL了，但HandlerSocket并不局限于KV形式，所以仍然有生存空间。

互联网技术发展犹如一列高速运行的火车，下一站：HandlerSocket！大家做好准备吧。