ThinkPHP where方法详解
分类:PHP时间: 2016年4月22日
在ThinkPHP框架中,where方法的用法是查询语言的精髓,是ThinkPHP连贯操作的重要部分。where方法的参数支持字符串、数组和对象,数组查询是非常强大的,也是官方推荐的。where方法可以完成包括普通查询、表达式查询、快捷查询、区间查询、组合查询在内的查询操作。下面PHP程序员雷雪松详细的讲解下where方法的用法。
1、字符串查询
M("User")->where('status=0')->select();//查询status为0的记录
2、数组查询
a、普通查询
$where['status'] = 0;//字段就是数组的下标,值就是对应的条件 M("User")->where(array('status'=>'0'))->select();//查询status为0的记录
注意:数组的下标必须为数据库的字段,否则会被过滤。
b、表达式查询
表达式 | 含义 |
---|---|
EQ | 等于(=) |
NEQ | 不等于(<>) |
GT | 大于(>) |
EGT | 大于等于(>=) |
LT | 小于(<) |
ELT | 小于等于(<=) |
LIKE | 模糊查询 |
[NOT] BETWEEN | (不在)区间查询 |
[NOT] IN | (不在)IN 查询 |
EXP | 表达式查询,支持SQL语法 |
$where['status'] = array("eq",0);//字段就是数组的下标,值就是对应的条件 M("User")->where($where)->select();//查询status为0的记录
3、where方法数组查询例子
1、如何使用数组实现同一字段多个条件?比如,查询createdate大于等于2016年4月20日并且小于等于2016年4月23日的记录。
$where['createdate'] = array(array('EGT',"2016-04-20"),array('ELT',"2016-04-23"));//使用一个二维数组就可以解决同一字段多个条件 M("User")->where($where)->select();//查询createdate大于等于2016年4月20日并且小于等于2016年4月23日的记录
2、数组查询使用OR查询?比如,查询status等于0或者1的记录。
$where['status'] = array(array('EQ',"0"),array('EQ',"1"),"OR");//使用一个二维数组就可以解决同一字段多个条件 M("User")->where($where)->select();//查询status等于0或者1的记录
3、多个条件里既有AND又有OR的数组查询?比如,查询createdate小于等于2016年4月20日并且status为1或者level为0的记录。
$where['createdate'] = array('EGT',"2016-04-20"); $where['status'] = '1'; $condition['_logic'] = "AND"; $map['_complex']=$where; $map['level']='0'; $map['_logic']='OR'; M("User")->where($map)->select();//查询createdate小于等于2016年4月20日并且status为1或者level为0的记录

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