How to perform fuzzy query in thinkphp

First of all, in ThinkPHP, we can operate the database through the Db class. We can use the table method of the Db class to specify which data table to operate, and then call the corresponding query method to operate. When performing fuzzy queries, we can use the like method. The field name that requires fuzzy matching is used as the first parameter of this method, and the string that needs to be matched is used as the second parameter. For example, if we want to query all users whose names contain "Zhang", we can write the code like this:

Db::table('user')->where('name', 'like', '%张%')->select();

In this statement, the first parameter of the where method is the condition to be queried, where 'name' is the data The field name in the table, the second parameter 'like' indicates that we want to perform fuzzy matching, and the third parameter '%张%' is the string that needs to be matched. Using the % wildcard character, you can match a string containing any number of characters, so you can find all users whose usernames contain "张".

In addition to using the query methods provided by the Db class, ThinkPHP also provides some more advanced query methods, such as model query and related query, etc. Defining model classes simplifies queries because model queries are implemented using defined model classes. For example, we can define a searchByName method in the User model to query all users whose names contain the specified string:

class User extends Model
{
    public function searchByName($keyword)
    {
        return $this->where('name', 'like', '%' . $keyword . '%')->select();
    }
}

In this method, $this represents the object of the current User model, and the where method is The same as described above, except that the Db class is replaced by $this. We can encapsulate this query method so that it can be reused anywhere in the application

class User extends Model
{
    public static function searchByName($keyword)
    {
        return self::where('name', 'like', '%' . $keyword . '%')->select();
    }
}

Here we change the searchByName method to a static method and replace $this with self, so that it can be used anywhere in the application. The User::searchByName() method is directly called to query.

Associative query is a method of querying by connecting multiple related data tables using the JOIN statement. Relevant queries in ThinkPHP are implemented by defining model associations. The specific implementation method is beyond the scope of this article. However, it should be noted that when performing fuzzy queries, the JOIN statement will reduce the query efficiency. In this case, you can consider performing fuzzy queries first. , and then perform related queries, or use caching and other methods to improve query speed.

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