欢迎访问芦艺网!

WHERE语法-Medoo使用指南

上一篇《Medoo入门:安装和配置-Medoo使用指南》中介绍了Medoo的安装、配置和基本使用。本篇将介绍Medoo的WHERE语法。

Medoo的一些方法要求传递$where参数,像SQL的WHERE子句那样用于筛选查询记录。WHERE子句很强大,但有很多复杂的语法,逻辑相关性,以及有关SQL注入的潜在安全问题。但Medoo提供了强大和极端易用的方式来构造WHERE子句和预防SQL注入。

php-medoo

基本条件
基本条件足够简单易懂。您可以使用其他符号来获得用于数字的高级过滤器。

$database->select("account", "user_name", [
	"email" => "foo@bar.com"
]);
// WHERE email = 'foo@bar.com'
 
$database->select("account", "user_name", [
	"user_id" => 200
]);
// WHERE user_id = 200
 
$database->select("account", "user_name", [
	"user_id[>]" => 200
]);
// WHERE user_id > 200
 
$database->select("account", "user_name", [
	"user_id[>=]" => 200
]);
// WHERE user_id >= 200
 
$database->select("account", "user_name", [
	"user_id[!]" => 200
]);
// WHERE user_id != 200
 
$database->select("account", "user_name", [
	"age[<>]" => [200, 500]
]);
// WHERE age BETWEEN 200 AND 500
 
// 你不仅可以使用单一的字符串或数字值,也可以使用数组
$database->select("account", "user_name", [
	"OR" => [
		"user_id" => [2, 123, 234, 54],
		"email" => ["foo@bar.com", "cat@dog.com", "admin@medoo.in"]
	]
]);
// WHERE
// user_id IN (2,123,234,54) OR
// email IN ('foo@bar.com','cat@dog.com','admin@medoo.in')
 
// 否定条件 (自Medoo 0.9起支持)
$database->select("account", "user_name", [
	"AND" => [
		"user_name[!]" => "foo",
		"user_id[!]" => 1024,
		"email[!]" => ["foo@bar.com", "cat@dog.com", "admin@medoo.in"],
		"city[!]" => null
	]
]);
// WHERE
// `user_name` != 'foo' AND
// `user_id` != 1024 AND
// `email` NOT IN ('foo@bar.com','cat@dog.com','admin@medoo.in') AND
// `city` IS NOT NULL
 
// 可以从 select()或get()方法的结果取得
$database->select("account", "user_name", [
	"user_id" => $database->select("post", "user_id", ["comments[>]" => 40])
]);
// WHERE user_id IN (2, 51, 321, 3431)

相对条件
相对条件可以描述数据和数据之间的复杂关系。您可以使用“and”和“or”来构建复杂的相对条件查询。

// [基本的相对条件]
$database->select("account", "user_name", [
	"AND" => [
		"user_id[>]" => 200,
		"age[<>]" => [18, 25],
		"gender" => "female"
	]
]);
// WHERE user_id > 200 AND age BETWEEN 18 AND 25 AND gender = 'female'
 
$database->select("account", "user_name", [
	"OR" => [
		"user_id[>]" => 200,
		"age[<>]" => [18, 25],
		"gender" => "female"
	]
]);
// WHERE user_id > 200 OR age BETWEEN 18 AND 25 OR gender = 'female'
 
// [复合的相对条件]
$database->has("account", [
	"AND" => [
		"OR" => [
			"user_name" => "foo",
			"email" => "foo@bar.com"
		],
		"password" => "12345"
	]
]);
// WHERE (user_name = 'foo' OR email = 'foo@bar.com') AND password = '12345'

全文搜索
通过目标关键词搜索记录。

// [MATCH]
$database->select("post_table", "post_id", [
	"MATCH" => [
		"columns" => ["content", "title"],
		"keyword" => "foo"
	]
]);
// WHERE MATCH (content, title) AGAINST ('foo')
 
// [LIKE]
// The default connector of LIKE is AND
$database->select("account", "user_id", [
	'LIKE' => [
		'location' => "foo",
		'nickname' => "foo",
		'user_name' => "foo",
		'description' => "foo"
	]
]);
 
$database->select("account", "user_id", [
	'LIKE' => [
		'AND' => [
			'location' => "foo",
			'nickname' => "foo",
			'user_name' => "foo",
			'description' => "foo"
		]
	]
]);
// WHERE (
//	location LIKE '%foo%' AND
//	nickname LIKE '%foo%' AND
//	user_name LIKE '%foo%' AND
//	description LIKE '%foo%'
// )
 
$database->select("account", "user_id", [
	'LIKE' => [
		'OR' => [
			'location' => "foo",
			'nickname' => "foo",
			'user_name' => "foo",
			'description' => "foo"
		]
	]
]);
// WHERE (
//	location LIKE '%foo%' OR
//	nickname LIKE '%foo%' OR
//	user_name LIKE '%foo%' OR
//	description LIKE '%foo%'
// )

附加条件

$database->select("account", "user_id", [
	"GROUP" => "type",

	// "ORDER" => "age DESC"
	"ORDER" => "age",

	// Must have to use it with ORDER together
	"HAVING" => [
		"user_id[>]" => 500
	],

	// LIMIT => 20
	"LIMIT" => [20, 100]
]);
//	SELECT user_id FROM account
//	GROUP BY type
//	ORDER BY age
//	HAVING user_id > 500
//	LIMIT 20,100

Medoo版本: 0.9.1.1 , 官网原文:http://medoo.in/api/where

→ 下一篇:选取方法:Select API-Medoo使用指南

发表评论

关闭菜单