Thinkphp3.2.3打印上⼀句执⾏的sql语句
$num = M('joinactivity as a')->join('fh_activity as b on b.a_id = a.a_id')->where($where)->count();
thinkphp3echo M('joinactivity as a')->_sql();
SELECT COUNT(*) AS tp_count FROM fh_joinactivity as a INNER JOIN fh_activity as b on b.a_id = a.a_id WHERE a.u_id = 1 AND a.is_read = 0 AND b.a_time < 1486556237 LIMIT 1

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