thinkphp5 で一般的に使用されるデータベース クエリ ステートメントの概要

$name = Db::name('data') -> where('id', 16) -> value('name'); print_r($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 */

$list = Db::name('data) -> where('status', 1) -> column('name'); print_r($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 ) */

$list = Db::name('data) -> where('status', 1) -> column('name', 'id'); print_r($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 ) */

$list = Db::name('data') -> where('status', 1) -> column('*', 'id'); print_r($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 ) ... ) */

$count = Db::name('data') -> where('status', 1) -> count(); echo $count; // 结果：9

$max = Db::name('data') -> where('status', 1) -> max('id); echo $max; // 结果：11

$result = Db::name('data') -> where("id > :id and name like :name", [ 'id' => 10, 'name' => "%php%" ]) -> select(); print_r($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%') */

$result = Db::name('users') -> whereTime('reg_time', '>', '2016-1-1') -> select(); print_r($result); /** 原生sql语句： >Prepare SELECT * FROM `tp_users` WHERE `reg_time` > ? >Execute SELECT * FROM `tp_users` WHERE `reg_time` > 1451577600 */

$result = Db::name('users') -> whereTime('reg_time', '>', 'this week') -> select(); print_r($result); // 从本周星期一开始

$result = Db::name('users') -> whereTime('reg_time', '>', '-2 days') -> select(); print_r($result);

$result = Db::name('users') -> whereTime('reg_time', 'between', ['2016-1-1', '2017-7-1']) -> select(); print_r($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 */

$result = Db::name('users') -> whereTime('reg_time', 'today') -> select(); print_r($result);

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 */

$p = 0; do { $result = Db::name('data') -> limit($p, 2) -> select(); $p += 2; //处理数据 } while(count($result) > 0);