thinkphp database query quantity operation method

When using the ThinkPHP framework for database development, querying the quantity of data is a very basic operation. This article will introduce how to use the database query quantity operation method in the ThinkPHP framework to help developers better implement the data query function.

1. Total number of queries

In development, we need to query the total number of records in a table. There are two ways to query the total number using the ThinkPHP framework:

1. Use the count method

The count method is the standard method for querying the quantity in ThinkPHP and can easily return the query results. Records. The usage method is as follows:

$count = Db::name('table')->count();

Among them, table refers to the name of the data table to be queried, and the count() method returns the total number of records.

2. Using the Find method

We can also use the Find method to get the total number of records. The Find method returns a record, and the value of the record is the number of all records in the table. The usage method is as follows:

$count = Db::name('table')->field('count(*) as count')->find();

It should be noted that the field() method is used here to specify the field of the returned record, and the AS statement returns the number of records.

2. Query the total number of specified conditions

When querying data, sometimes we need to query the total number of records that meet the condition based on a certain condition. The method of using the ThinkPHP framework to query the total number of specified conditions is as follows:

1. Using the where method

The where method is a method used to set query conditions. It can return the results according to the specified conditions. The total number of records for this condition. The usage is as follows:

$count = Db::name('table')->where('id',1)->count();

Query the number of records with id=1. If you need to query multiple conditions, you can use an array to pass it:

$count = Db::name('table')->where(['id'=>1,'status'=>1])->count();

This will query the number of records that satisfy id=1 and status=1.

2. Use whereOr method

If you need to query the number of records that meet any of multiple conditions, you can use the whereOr method. The usage method is as follows:

$count = Db::name('table')->whereOr(['id'=>1,'status'=>1])->count();

This will query the number of records that satisfy id=1 or status=1.

The above is the operation method of querying the quantity in the ThinkPHP framework. To summarize, the count method and the Find method are two relatively simple methods for querying the number of records, among which the field method is used to set the returned fields. When querying the number of records of a certain condition, you can use the where method to set the query conditions or the whereOr method to query the existing quantity of any one of multiple conditions. For framework developers, these methods of querying the number of records will greatly reduce development time.

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