thinkphp in query how to paginate

ThinkPHP is a widely used PHP framework that provides powerful query functions that allow users to easily perform various complex query operations. Among them, the in query statement is one of the commonly used query statements. This article will introduce how to use the in query statement in ThinkPHP to implement the paging function.

1. What is in query

Before understanding how in query is paginated, we need to first understand what in query is. In database queries, the in query statement is a statement used to match query conditions given a set of values. For example, if we want to find a product whose category is TV or computer or mobile phone, we can use the in query statement. The in query syntax is as follows:

SELECT column_name(s) FROM table_name WHERE column_name IN (value1,value2,...);

Among them, IN is followed by a bracket, and inside the bracket is a list of values. For example:

SELECT * FROM products WHERE category_name IN ('手机', '电脑', '电视');

This SQL statement will return product information for mobile phones, computers or TVs.

2. How to use in query to implement paging

After understanding the basic usage of in query statement, we can start to solve how to use in query statement to implement paging. Pagination refers to dividing the results into several pages in the query result set so that users can browse the query results page by page. ThinkPHP provides powerful paging function, which can easily implement paging function.

In ThinkPHP, the paging class is located in the \think\paginator namespace. Using the paging function requires the following three steps:

1. Query data

Use the in query statement to query the data that needs to be paginated, for example:

$goods = Db::name('goods')
         ->where('category_id','in',[1,2,3,4,5])
         ->order('price DESC')
         ->paginate(10);

The above code Products with product categories 1, 2, 3, 4, and 5 will be queried, sorted by price from high to low, and 10 pieces of data will be displayed on each page.

2. Get pagination data

By calling the paginate() method, we can get the paginator object. The pager object includes information such as the current page number, the number of data displayed on each page, and the total number of data items. We can get the data in the paginator in the following ways:

$goods = $goods->items();

3. Rendering the paginated view

The paginator object also contains rendering methods for pagination information. We can use these methods to generate paginated views. . For example:

<div class="pagination"><?php echo $goods->render(); ?></div>

In the above code, we generate the html view of the paginator through the render() method, and then insert it into the page. In this way, we have completed the paging function using the in query statement.

3. Summary

This article introduces how to use the in query statement in ThinkPHP to implement paging. The in query statement can easily query multiple given values, and the pager can easily display the data in pages. Combining these two functions, we can easily implement complex query and paging functions.

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