MySQL での IP アドレスの保存

CREATE TABLE access_log (
    id         INT AUTO_INCREMENT PRIMARY KEY,
    ip_address VARCHAR(45),    -- fits IPv4 (15 chars) and IPv6 (39 chars)
    accessed_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

INSERT INTO access_log (ip_address) VALUES ('192.168.1.5');

CREATE TABLE access_log (
    id         INT AUTO_INCREMENT PRIMARY KEY,
    ip_address INT UNSIGNED,
    accessed_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

INSERT INTO access_log (ip_address)
VALUES (INET_ATON('192.168.1.5'));

SELECT INET_NTOA(ip_address) AS ip FROM access_log;

INSTALL EXTENSION vsql_network_address;

CREATE TABLE access_log (
    id         INT AUTO_INCREMENT PRIMARY KEY,
    ip_address INET,
    accessed_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

-- IPv4 and IPv6 in the same column
INSERT INTO access_log (ip_address) VALUES
    (inet_from_string('192.168.1.5')),
    (inet_from_string('10.0.0.1')),
    (inet_from_string('2001:db8::1'));

-- Read back as strings
SELECT inet_to_string(ip_address), accessed_at FROM access_log;

-- Sort by IP address numerically (not lexicographically)
SELECT inet_to_string(ip_address) FROM access_log ORDER BY ip_address;

-- Extract address family
SELECT inet_to_string(ip_address),
       inet_family(ip_address) AS family   -- 4 or 6
FROM access_log;

-- Check if an address is IPv6
SELECT * FROM access_log
WHERE inet_family(ip_address) = 6;

-- Store with a netmask (INET allows host bits)
INSERT INTO access_log (ip_address)
VALUES (inet_from_string('192.168.1.5/24'));

SELECT inet_host(ip_address)    AS host_part,
       inet_masklen(ip_address) AS prefix_len
FROM access_log WHERE id = 1;

CREATE INDEX idx_ip ON access_log(ip_address);

-- Equality lookups use the index
SELECT * FROM access_log
WHERE ip_address = inet_from_string('192.168.1.5');