ThinkPHP is a very excellent PHP development framework. It adopts the MVC design pattern and is a reusable framework for building object-oriented Web applications. In development, it is often necessary to obtain the length of query results. This article will introduce how to obtain the length of query results in ThinkPHP.

1. Use the count method

In ThinkPHP, you can use the count method to get the length of the query result. The count method is a static method and can be used directly:

$count?=?ModelName::where($where)->count();

Among them, ModelName is your model and $where is the query condition. Specify query conditions through the where method, and then call the count method to obtain the number of query results.

2. Use select method count function

In addition to using the count method, you can also use the select method and count function to obtain the length of the query result. The method is as follows:

$count?=?ModelName::where($where)->field('count(*)?as?count')->select()[0]['count'];

In this method, the data column to be queried is specified through the field method. Here, the count function is selected, and then the alias is specified as count. Finally, call the select method to obtain the query result, take out the first element in the array (because only one row of data is returned), and then take out the value of the count column to get the length of the query result.

Summary

To obtain the length of the query result in ThinkPHP, you can use the count method or the select method count function. Using the count method is more concise and clear, but if you need to obtain other statistical results (such as average, maximum, etc.), you can use the select method and the corresponding function to achieve it. Using these methods, you can easily obtain the number of query results and play a very helpful role in development.

The above is the detailed content of How to get the length of query results in ThinkPHP. For more information, please follow other related articles on the PHP Chinese website!