MySQL分布式鎖是一種常見(jiàn)的數(shù)據(jù)并發(fā)控制方法，可以在分布式系統(tǒng)中用來(lái)控制多個(gè)進(jìn)程、線程間對(duì)同一資源的訪問(wèn)。本文將介紹MySQL分布式鎖的使用教程。

第一步，創(chuàng)建名為lock的數(shù)據(jù)庫(kù)表：

CREATE TABLE `lock` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`resource_name` varchar(128) NOT NULL,
`owner` varchar(128) DEFAULT NULL,
`create_time` datetime DEFAULT NULL,
PRIMARY KEY (`id`),
UNIQUE KEY `idx_lock_resource_name` (`resource_name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

第二步，編寫獲取和釋放鎖的方法：

//獲取鎖
public boolean getLock(String resourceName, String owner, int expireSeconds) {
String sql = "INSERT INTO `lock` (resource_name, owner, create_time) VALUES (?, ?, NOW()) ";
sql += "ON DUPLICATE KEY UPDATE owner=VALUES(owner), create_time=VALUES(create_time)";
int result = jdbcTemplate.update(sql, resourceName, owner);
return result == 1;
}
//釋放鎖
public boolean releaseLock(String resourceName, String owner) {
String sql = "DELETE FROM `lock` WHERE resource_name= ? AND owner=?";
int result = jdbcTemplate.update(sql, resourceName, owner);
return result == 1;
}

第三步，使用分布式鎖：

String resourceName = "my_resource";
String owner = UUID.randomUUID().toString();
int expireSeconds = 60;
while (!getLock(resourceName, owner, expireSeconds)) {
//未獲取到鎖，則等待一段時(shí)間再重試
Thread.sleep(100);
}
try {
//執(zhí)行需加鎖的業(yè)務(wù)邏輯
} finally {
releaseLock(resourceName, owner);
}

以上就是MySQL分布式鎖的使用教程，希望對(duì)大家有所幫助。