Add, delete, modify and check in ThinkPHP

thinkphp is a PHP framework, abbreviated as tp. Today I will talk about the addition, deletion, and modification of tp. I believe that I understand the addition, deletion, and modification of tp. , you will definitely feel that the native one you used before is really too troublesome, and you wish you could use tp for everything you write. Let’s take a look!

1. Creation operation

Use the add method in ThinkPHP to add data to the database.

The usage method is as follows:

$User = M("User"); // 实例化User对象
$data['name'] = 'ThinkPHP';
$data['email'] = 'ThinkPHP@gmail.com';
$User->add($data);

Or use the data methodContinuous operation

$User->data($data)->add();

If the data object has been created before add (for example, using create Or data method), the add method does not need to pass in data.

Example of using the create method:

$User = M("User"); // 实例化User对象

// Create a data object based on the POST data submitted by the form

$User->create();
$User->add(); // 根据条件保存修改的数据

If your primary key is an automatic growth type, and if Insert dataIf successful, the return value of the Add method is the latest inserted primary key value, which can be obtained directly.

2. Reading data

There are many ways to read data in ThinkPHP, usually divided into reading data and reading data sets .

Read the data set using the findall or select method (findall and select methods are equivalent):

$User = M("User"); // 实例化User对象

// Find user data with a status value of 1 and return 10 pieces of data in order of creation time

$list = $User->where('status=1')->order('create_time')->limit(10)->select();

The return value of the select method is a two-dimensional array. If no results are found, an empty array is returned. Complex data queries can be completed with the coherent operation methods mentioned above. The most complex coherent method should be the use of the where method, because this part involves a lot of content, we will give detailed instructions on how to assemble query conditions in the query language part. The basic query does not involve the related query part for the time being, but uses the related model to perform data operations. Please refer to the related model part for this part.

Read data using the find method:

The operation of reading data is actually similar to that of the data set. All the coherent operation methods available for select can also be used for the find method. The difference is that the find method Only one record will be returned at most, so the limit method is invalid for find query operations.

$User = M("User"); // 实例化User对象

//Find user data with status value 1 and name value think

$User->where('status=1 AND name="think" ')->find();

Even if there is more than one piece of data that meets the conditions, the find method will only return the first record.

If you want to read the value of a certain field, you can use the getField method, for example:

$User = M("User"); // 实例化User对象

// Get the nickname of the user with ID 3

$nickname = $User->where('id=3')->getField('nickname');

When there is only one field, always returns a value.

If multiple fields are passed in, an associative array can be returned:

$User = M("User"); // 实例化User对象

// Get the list of IDs and nicknames of all users

$list = $User->getField('id,nickname');

The returned list is an array , the key name is the user's id, and the key value is the user's nickname.

3. Update data

Use the save method to update the database in ThinkPHP, and also supports the use of coherent operations.

$User = M("User"); // 实例化User对象

// Assignment of data object attributes to be modified

$data['name'] = 'ThinkPHP';
$data['email'] = 'ThinkPHP@gmail.com';
$User->where('id=5')->save($data); // 根据条件保存修改的数据

In order to ensure the security of the database and avoid errors, update the entire data table. If there are no update conditions, the data object itself will not If the primary key field is included, the save method will not update any database records.

Therefore the following code will not change any records in the database

$User->save($data);

Unless the following method is used:

$User = M("User"); // 实例化User对象

// Assignment of the data object attributes to be modified

$data['id'] = 5;
$data['name'] = 'ThinkPHP';
$data['email'] = 'ThinkPHP@gmail.com';
$User->save($data); // 根据条件保存修改的数据

If id is the primary key of the data table, the system will automatically use the value of the primary key as the update condition to update the values ​​of other fields.

Another method is to create the data object to be updated through the create or data method, and then save it, so that the parameters of the save method do not need to be passed in.

$User = M("User"); // 实例化User对象

// Assignment of data object attributes to be modified

$data['name'] = 'ThinkPHP';
$data['email'] = 'ThinkPHP@gmail.com';
$User->where('id=5')->data($data)->save(); // 根据条件保存修改的数据

Example of using the create method:

$User = M("User"); // 实例化User对象

// Create a data object based on the POST data submitted by the form

$User->create();
$User->save(); //根据条件保存要修改的数据

In the above situation, the form must contain a hidden field named with the primary key to complete the save operation.

If you only update the value of individual fields, you can use the setField method:

$User = M("User"); // 实例化User对象

//Change the user's name value

$User-> where('id=5')->setField('name','ThinkPHP');

The setField method supports updating multiple fields at the same time, only You just need to pass in an array, for example:

$User = M("User"); // 实例化User对象

// Change the value of the user's name and email

$User-> where('id=5')->setField(array('name','email'),array('ThinkPHP','ThinkPHP@gmail.com'));

As for the update of statistical fields (usually referring to numeric types), the system also Provides setInc and setDec methods:

$User = M("User"); // 实例化User对象
$User->setInc('score','id=5',3);// 用户的积分加3
$User->setInc('score','id=5'); // 用户的积分加1
$User->setDec('score','id=5',5);// 用户的积分减5
$User->setDec('score','id=5'); // 用户的积分减1

4. Delete data

Use delete method to delete the database in ThinkPHP records in. Delete operations can also be performed using coherent operations.

$User = M("User"); // 实例化User对象
$User->where('id=5')->delete(); // 删除id为5的用户数据
$User->where('status=0')->delete(); // 删除所有状态为0的用户数据

delete方法可以用于删除单个或者多个数据，主要取决于删除条件，也就是where方法的参数，也可以用order和limit方法来限制要删除的个数，例如：

// 删除所有状态为0的5个用户数据按照创建时间排序

$User->where('status=0')->order('create_time')->limit('5')->delete();

以上就是tp的增删查改四种方法了，更多关于tp的内天请到本站搜索哦~

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