How to implement fuzzy query and deduplication in laravel

In Laravel, we often need to perform fuzzy queries and hope that the query results do not contain duplicate data. This article describes how to use Laravel's query builder to implement fuzzy queries and deduplication operations.

1. Fuzzy query

Laravel’s query constructor provides many flexible methods to easily implement fuzzy queries. The following are some common fuzzy query methods:

1. Use like method

Use like method to implement basic fuzzy query. For example, suppose we need to query all articles containing the keyword "laravel":

$articles = DB::table('articles')
    ->where('content', 'like', '%laravel%')
    ->get();

In this example, we use the where method to specify the condition that the content field contains the keyword "laravel", And use the like operator to implement fuzzy query. Note that the % symbol is used to match any character.

2. Use the orWhere method

Use the orWhere method to implement multi-condition fuzzy query. For example, suppose we need to query all articles containing the keyword "laravel" or "php":

$articles = DB::table('articles')
    ->where('content', 'like', '%laravel%')
    ->orWhere('content', 'like', '%php%')
    ->get();

In this example, we use the where method to specify the first condition as the content field Contains the keyword "laravel" and uses the orWhere method to specify that the second condition is that the content field contains the keyword "php".

3. Use whereRaw method

Use whereRaw method to implement more complex fuzzy queries. For example, suppose we need to query all articles that contain at least one number:

$articles = DB::table('articles')
    ->whereRaw('content REGEXP "[0-9]+"')
    ->get();

In this example, we use the whereRaw method to specify that the condition is content The field matches the regular expression [0 -9] , that is, it contains at least one number.

2. Deduplication operation

When performing fuzzy query, we are likely to encounter the problem of duplicate data. To avoid duplicate data, we can use Laravel's deduplication operation. The following are some common deduplication operations:

1. Use distinct method

Use distinct method to achieve deduplication. For example, suppose we need to query all articles containing the keyword "laravel" and remove duplicate data:

$articles = DB::table('articles')
    ->select('title', 'content')
    ->distinct()
    ->where('content', 'like', '%laravel%')
    ->get();

In this example, we use the select method to specify that the returned fields are title and content, and use the distinct method to specify the deduplication operation. It should be noted that using the distinct method will query all fields and remove duplicate values.

2. Use the groupBy method

Use the groupBy method to group by fields and remove duplicate data after grouping. For example, suppose we need to query all articles containing the keyword "laravel", group them by author, and remove duplicate articles for each author:

$articles = DB::table('articles')
    ->select('author', 'title', 'content')
    ->where('content', 'like', '%laravel%')
    ->groupBy('author', 'title', 'content')
    ->get();

In this example, we use the select method to specify the returned fields for author, title, and content, and use the groupBy method to specify the order of author, title, and content to group. It should be noted that using the groupBy method may lead to inaccuracies in the result set, because it groups the matching result set by the specified field, which may prevent some data from being returned.

In short, using Laravel's query builder, we can easily implement fuzzy queries and deduplication operations, which can greatly improve query efficiency and the accuracy of the result set.

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