thinkphp3.2 where 条件查询
在连贯操作中条件where的操作有时候自己很晕,所以整理下,有助于使用
查询条件
支持的表达式查询,tp不区分大小写
含义 | TP运算符 | SQL运算符 | 例子 | 实际查询条件 |
---|---|---|---|---|
等于 | EQ | = | $where['id'] = 2 ($where['id'] = array('EQ','1')) |
id = 2 |
不等于 | NEQ | != | $where['id'] = array('NEQ','1') | id!=2 |
大于 | GT | > | $where['id'] = array('GT','1') | id >1 |
大于等于 | EGT | EGT | $where['id'] = array('EGT','1') | id>=1 |
小于 | < | < | $where['id'] = array('lt',1) | id < 1 |
小于等于 | <= | <= | $where['id'] = array('elt',1) | id<=1 |
匹配 | like | like | $where['id'] = array('like','%begin') $where['id'] = array('like','begin%') $where['id'] = array('like','%begin%') |
where id like '%begin' where id like 'begin%' where id like'%begin%' |
在范围内包括俩端值 | between | 0<=id<=10 | $where['id'] = array('between',array('0','10')) | where id between 0 and 10 |
不在范围内 | not between | 0 >id and 1o < id | $where['id'] = array('not between',array('0','10')) | where id not between 0 and 10 |
在枚举的值中 | in | in | $where['id'] = array('in',array('1','2','5')) | where id in ('1','2','3') |
不在枚举值中 | not in | not in | $where['id'] = array('not in',array('1','2',5)) | where id not in ('1','2','5') |
exp | 表达式查询,支持SQL语法 |
exp 是表达式的意思,如果你觉得对于一个值限制条件太多的话就可以用这个
$where['id'] = array('exp','in ( select id from id from tableb)');
复查的查询语句
有的时候,我们希望通过一次的查询就能解决问题,这个时候查询条件往往比较复杂,但是却比多次查询库来的高效。
实在是搞不定的话就直接用$where['_string'] = 'xxxx', 这个代表查询的时候拼接上 xxx 条件,一次性解决问题
$where['_string'] = 'left join A on A.id = b.id where a.id not in (select id from C)';
- 区间查询(一个值得多种情况)
默认是 and
$where['id'] =array(array('neq','8'),array('elt','200'),'and'); // 小于等于200 不等于 8
$where['id'] = array(array('neq','8'),'array('neq','10')','or'); // 不等于8或者不等于10
- 复合查询
相当于封装了新的查询条件在里面
$where['a'] = 5;
$where['b'] = 6;
$where['_logic'] = 'or';
sql:where a = 5 or b = 6;
$condition['c'] = '3';
$condition['d'] = '4'
$condition['_logic'] = 'or'
$where['a'] = 9;
$where['_complex'] = $condition;
sql: where a=9 and (c = 3 or d = 4)
根据需求,灵活使用(无限套下去)
3.sql 查询
如果有设置了读写分离的话 query 是查询 execute是更新保存
M()->query('select * from a');
M()->execute('update a set counts = 3 where id = 1103')
4.获取要执行的sql 语句
有的时候条件太复杂,比如 id in(xxxxx),这个xxx就是通过一系列操作获得的结果,嫌麻烦的就直接 都扔进去,写sql 又长,就直接获取sql语句扔进去
1.fetchsql
2.buildsql
3.select(false)
M('user')->fetchsql(true)->select();
M('user')->buildsql();
M('user')->select(false);