Detailed explanation of a simple department case (PHP code example)

Objective of this article:

1. Learn how to analyze a project according to a certain idea

Case:

1. Use object-oriented The final effect required by the method is:

Requirements:

Knowledge points that must be used:

1. Class definition

2. Class instantiation

3. Object reference assignment=&

4. Destructor

5. Constructor

The effect to be achieved in this case is actually very simple, but the key point is, is your thinking clear? Are your ideas organized to a certain extent, or have you done many projects? Have you summarized your own set of systematic ideas and plans? My summary is as follows:

3 analyses:

1. Process analysis

2. Specific implementation analysis

3 , Database analysis

3 executions:

1. Create database, initialize database data (Project startup data)

2. Create class, Implementation class

3. Write process

Next we analyze one by one

1. Process analysis

1. Get all department information

2. Get single department information

3. Write a test for object reference assignment =&

For example $jordon1=&$ jordon

4. Write a sentence at the end of all logic: The application ends here

5. The destructor of a class is executed

2. Specific Implementation analysis

1. The first step: identify the object (find the noun)

Based on the above process, we have only one object:

1. Department

2. Step 2: Identify the attributes of the object (data nouns combined with the real world to analyze and combine specific scenarios)

1. Department: Attributes include: id, name

3. Step 3: Method of identifying objects (verb combined with the real world to analyze and combine with specific scenarios)

1. Department methods are

1. Obtain all department information

    2. Obtain single department information

Because all data must be saved to the database, and all data must be obtained from the database, so next

Database Analysis:

Table: (There are at least as many tables as there are objects)

1. Department Field = Attributes of the object

Analysis completed Finally, we will do the specific operations

1. Create the database and initialize the database data (Project startup data)

Create the database, and we will name it Called department

Create a table for the database, indicating that it is called the department table

analyze whether there is initialization data, ( We can call it the startup data of the project. Without this data, the project cannot be started.) Then write these initialization data to the database

To sum up the above analysis, the initialization data is 3 departments

So Next we initialize the database

2. Create classes and implement classes

Create department classes:

For For the convenience of management, we put all the classes in the model folder, and then we call this class file Department.class.php, and then we write the attributes and methods of the classes analyzed above into the department class

model/Depart.class.php

<?php
//部门类
class Depart{
    //定义属性 id,名称
    public $id = "";
    public $name = "";
    public $conn = "";//数据库连接
    public $tableName = "depart";//表名
    //构造函数
    public function __construct( $id,$name ){
        //初始化属性
        $this->id = $id;
        $this->name = $name;
        //初始化行为 初始化方法
        $this->initConn();
    }
    //析构函数 销毁数据库连接
    public function __destruct(){
        //销毁连接
        if( $this->conn ){
            mysqli_close( $this->conn );
            echo "销毁了连接<br/>";
        }
    }
    
    //定义方法
    //创建公共的方法 获取数据库连接
    public function initConn(){
        $config = Array(
            "hostname"=>"127.0.0.1",
            "database"=>"depart",
            "username"=>"root",
            "password"=>"root"
        );
        $this->conn = mysqli_connect( $config[&#39;hostname&#39;],$config[&#39;username&#39;] ,$config[&#39;password&#39;],
                $config[&#39;database&#39;]);
    }
    // 1.获取所有部门信息
    public function getAll(){
        //创建数据库连接
        $conn = $this->conn;
        //写sql
        $sql = " select * from ".$this->tableName;
        //执行sql
        $result = mysqli_query( $conn,$sql );
        //获取数据
        // mysqli_fetch_all($result)//特点：不会包含字段名
        $list = Array();
        while( $row = mysqli_fetch_assoc(  $result ) ){
            $list[] = $row;
        }
        //返回数据
        return $list;
    }
    // 2.获取单个部门信息
    public function getOne( $id ){
        //创建数据库连接
        $conn = $this->conn;
        //写sql
        $sql = " select * from ".$this->tableName." where id= ".$id; 
        //执行sql
        $result = mysqli_query( $conn,$sql );
        //获取数据
        // mysqli_fetch_all($result)//特点：不会包含字段名
        $list = Array();
        while( $row = mysqli_fetch_assoc(  $result ) ){
            $list[] = $row;
        }
        //返回数据
        return $list;
    }
}
?>

3. Write the process

Next, we write the specific process and process code based on the results of the process analysis As follows:

<?php
//引入类文件
require_once "model/Depart.class.php";

//写流程
// 1.获取所有部门信息
//
$humanResourseDepartment = new Depart(2,"行政部门");
//通过对象调用方法  
$alllist = $humanResourseDepartment->getAll();


echo "<b>所有部门信息为：</b><br/>";
print_r( $alllist );
echo "<br/>";
// 2.获取单个部门信息 = 开发部门
$devDepartment = $humanResourseDepartment ->getOne( 1 );
echo "<b>开发部门信息：</b>  <br/>";
print_r( $devDepartment );
echo "<br/>";
// 3.对象引用赋值=&的测试
//      $jordon1=&$jordon
$humanResourseDepartment1 =& $humanResourseDepartment;
echo "修改前:行政部门的名字为：".$humanResourseDepartment->name."<br/>";
//修改
$humanResourseDepartment1->name = "人力部门";
echo "修改后:行政部门的名字为：".$humanResourseDepartment->name."<br/>";
// 4.在所有逻辑最后写一句话：应用程序到此为止
echo "<b>应用程序到此为止</b>  <br/>";

// 5.执行了一个类的析构函数
?>

The running results are as follows:

All department information is:
Array ( [0] => Array ( [ id] => 1 [name] => Development Department) [1] => Array ( [id] => 2 [name] => Administration Department) [2] => Array ( [id] => 3 [name] => Logistics Department) )
Development Department Information:
Array ( [0] => Array ( [id] => 1 [name] => Development Department) )
Before modification: The name of the administrative department is: Administrative Department
After modification: The name of the administrative department is: Human Resources Department
The application ends here
The connection is destroyed

(2) Summary:

1. Mainly recorded my project analysis ideas

I hope this article can bring some help to everyone, thank you! !

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