简单的单字段数据自增(多字段参考update)

$this->db()->increment('user-id-1', 1, 'nums');

生成的语句 UPDATE pre_user SET nums = nums+1 WHERE id = 1;

 //特别指定表前缀为u_(假设配置中配置的不为u_)v2.6.5起可用
$this->db()->increment('user-id-1', 1, 'nums', 'u_');

生成的语句 UPDATE u_user SET nums = nums+1 WHERE id = 1;

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