tp_data 数据表
value()
$name = Db::name('data')-> where('id', 16)-> value('name');print_r($name);// 获取 tp_data 数据表中 id = 16，name 字段的值,并打印// 结果：1111/** 原生sql语句>Prepare SELECT `name` FROM `tp_data` WHERE `id` = ? LIMIT 1>Execute SELECT `name` FROM `tp_data` WHERE `id` = 16 LIMIT 1*/column()
获取一列满足条件的数据
$list = Db::name('data)-> where('status', 1)-> column('name');print_r($list);// 从 tp_data 数据表获取一列 status = 1 的 name 字段值/** 结果：Array( [0] => thinkphp [1] => thinkphp [2] => thinkphp [3] => thinkphp [4] => 7777777777 [5] => thinkphp [6] => thinkphp [7] => thinkphp [8] => thinkphp)*/获取一列满足条件的数据，并以id值为键名
$list = Db::name('data)-> where('status', 1)-> column('name', 'id');print_r($list);// 从 tp_data 数据表获取一列 status=1 的 name 字段值集合/** 结果：Array( [3] => thinkphp [4] => thinkphp [5] => thinkphp [6] => thinkphp [7] => 7777777777 [8] => thinkphp [9] => thinkphp [10] => thinkphp [11] => thinkphp)*/获取以id为键名的数据集
$list = Db::name('data') -> where('status', 1) -> column('*', 'id');print_r($list);// 从 tp_data 数据表获取一列 status=1 的数据集/** 结果：Array( [3] => Array( [id] => 3 [name] => thinkphp [status] => 1 ) [4] => Array( [id] => 4 [name] => thinkphp [status] => 1 ) [5] => Array( [id] => 5 [name] => thinkphp [status] => 1 ) ...)*/聚合查询
count
max
min
avg
sum
统计 data 表的数据
$count = Db::name('data')-> where('status', 1)-> count();echo $count;// 结果：9统计 data 表的最大 id
$max = Db::name('data')-> where('status', 1)-> max('id);echo $max;// 结果：11简单查询
$result = Db::name('data')-> where("id > :id and name like :name",['id' => 10,'name' => "%php%"])-> select();print_r($result);/** 结果：Array( [0] => Array( [id] => 11 [name] => thinkphp [status] => 1 ))*//** 原生sql语句：>Prepare SELECT * FROM `tp_data` WHERE (id > ? and name like ?)>Execute SELECT * FROM `tp_data` WHERE (id > '10' and name like '%php%')*/日期查询
日期类型int，时间戳格式
查询时间大于 2016-1-1 的数据
$result = Db::name('users')-> whereTime('reg_time', '>', '2016-1-1')-> select();print_r($result);/** 原生sql语句：>Prepare SELECT * FROM `tp_users` WHERE `reg_time` > ?>Execute SELECT * FROM `tp_users` WHERE `reg_time` > 1451577600*/查询本周
$result = Db::name('users')-> whereTime('reg_time', '>', 'this week')-> select();print_r($result);// 从本周星期一开始查询最近两天添加的数据
$result = Db::name('users')-> whereTime('reg_time', '>', '-2 days')-> select();print_r($result);查询创建时间在 2016-1-1 ~ 2017-7-1 的数据
$result = Db::name('users')-> whereTime('reg_time', 'between', ['2016-1-1', '2017-7-1'])-> select();print_r($result);/** 原生sql语句：>Prepare SELECT * FROM `tp_users` WHERE `reg_time` BETWEEN ? AND ?>Execute SELECT * FROM `tp_users` WHERE `reg_time` BETWEEN 1451577600 AND 1483200000*/查询今天的数据
昨天：yesterday
本周：week
上周：last week
$result = Db::name('users')-> whereTime('reg_time', 'today')-> select();print_r($result);分块查询
Db::name('data')-> where('status', '>', 0)-> chunk(2, function($list) { foreach($list as $data) { //处理2条记录 }});/** 原生sql语句：>Prepare SELECT * FROM `tp_data` WHERE `status` > ? ORDER BY `id` asc LIMIT 2>Execute SELECT * FROM `tp_data` WHERE `status` > 0 ORDER BY `id` asc LIMIT 2>Close stmt>Prepare SELECT * FROM `tp_data` WHERE `status` > ? AND `id` > ? ORDER BY `id` asc LIMIT 2>Execute SELECT * FROM `tp_data` WHERE `status` > 0 AND `id` > 4 ORDER BY `id` asc LIMIT 2>Close stmt>Prepare SELECT * FROM `tp_data` WHERE `status` > ? AND `id` > ? ORDER BY `id` asc LIMIT 2>Execute SELECT * FROM `tp_data` WHERE `status` > 0 AND `id` > 6 ORDER BY `id` asc LIMIT 2>Close stmt...>Prepare SELECT * FROM `tp_data` WHERE `status` > ? AND `id` > ? ORDER BY `id` asc LIMIT 2>Execute SELECT * FROM `tp_data` WHERE `status` > 0 AND `id` > 16 ORDER BY `id` asc LIMIT 2>Close stmt>Prepare SELECT * FROM `tp_data` WHERE `status` > ? AND `id` > ? ORDER BY `id` asc LIMIT 2>Execute SELECT * FROM `tp_data` WHERE `status` > 0 AND `id` > 17 ORDER BY `id` asc LIMIT 2>Close stmt*/改进
$p = 0;do { $result = Db::name('data') -> limit($p, 2) -> select(); $p += 2; //处理数据} while(count($result) > 0);
