Eg:('a'=1 and 'b'=2) or ('c'=3 and 'd'=4) and 'e'=5
解決方法
$condition1['a'] = 1;
$condition1['b'] = 2;
$condition2['c'] = 3;
$condition2['d'] = 4;
$condition['_complex'] = array(
$condition1,
$condition2,
'_logic' => 'or'
);
$condition['e'] = 5;
D('模型')->where($condition)->select();