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。
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" => "[email protected]"
]);
// WHERE email = '[email protected]'
$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" => ["[email protected]", "[email protected]", "[email protected]"]
]
]);
// WHERE
// user_id IN (2,123,234,54) OR
// email IN ('[email protected]','[email protected]','[email protected]')
// 否定条件 (自Medoo 0.9起支持)
$database->select("account", "user_name", [
"AND" => [
"user_name[!]" => "foo",
"user_id[!]" => 1024,
"email[!]" => ["[email protected]", "[email protected]", "[email protected]"],
"city[!]" => null
]
]);
// WHERE
// `user_name` != 'foo' AND
// `user_id` != 1024 AND
// `email` NOT IN ('[email protected]','[email protected]','[email protected]') 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" => "[email protected]"
],
"password" => "12345"
]
]);
// WHERE (user_name = 'foo' OR email = '[email protected]') 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
原文标题：WHERE语法-Medoo使用指南
原文链接：http://loiy.net/post/566.html