How to implement additions, deletions and modifications in PHP object-oriented database connection

php object-oriented method of connecting to the database to implement additions, deletions and modifications: first create the Mysql class and define variables; then initialize the class through the constructor; then connect to the database and customize the method of inserting data; finally use the update and delete methods to modify Or just delete the data.

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PHP (object-oriented) connects to the database to achieve basic additions, deletions and modifications Check

1. Create the mysql_class.php file and then create the Mysql class in the file and define the variable

<?php
    class
 Mysql{
        private
 $host;//服务器地址
        private
 $root;//用户名
        private
 $password;//密码
        private
 $database;//数据库名
         
        //后面所提到的各个方法都放在这个类里
        //...
    }
?>

2. Initialize the class through the constructor

function
 __construct($host,$root,$password,$database){
    $this->host
 = $host;
    $this->root
 = $root;
    $this->password
 = $password;
    $this->database
 = $database;
    $this->connect();
}

For connect( ) method, let’s talk about it in the next step

3. Methods to create a connection database and close the database

function
 connect(){
    $this->conn
 = mysql_connect($this->host,$this->root,$this->password) or die("DB
 Connnection Error !".mysql_error());
    mysql_select_db($this->database,$this->conn);
    mysql_query("set
 names utf8");
}
         
function
 dbClose(){
    mysql_close($this->conn);
}

4. Encapsulate the mysql_query(), mysql_fetch_array(), mysql_num_rows() functions

function
 query($sql){
    return
 mysql_query($sql);
}
        
function
 myArray($result){
    return
 mysql_fetch_array($result);
}
        
function
 rows($result){
    return
 mysql_num_rows($result);
}

5. Customized query data method

function
 select($tableName,$condition){
    return
 $this->query("SELECT
 * FROM $tableName $condition");
}

6. Customized data insertion method

function
 insert($tableName,$fields,$value){
    $this->query("INSERT
 INTO $tableName $fields VALUES$value");
}

7. Customized data modification method

function
 update($tableName,$change,$condition){
    $this->query("UPDATE
 $tableName SET $change $condition");
}

8. Customized deletion of data Method

function
 delete($tableName,$condition){
    $this->query("DELETE
 FROM $tableName $condition");
}

Now that the database operation class has been encapsulated, let’s take a look at how to use it.

We still use PHP to connect to the database to implement the most basic addition, deletion, modification and query (process-oriented) of the database and tables involved in the article (the data in the table is added by yourself):

9 , then we first instantiate the database operation class

$db
 = new Mysql("localhost","root","admin","beyondweb_test");

Instantiation can be performed outside the Mysql class in the mysql_class.php file.

Then we create a test.php file, first introduce the mysql_class.php file

<?php
    require("mysql_class.php");
?>

Then let’s start the operation

10. Insert data into the table

<?php
    $insert
 = $db->insert("user","(nikename,email)","(#beyondweb#,#beyondwebcn@xx.com#)");//请把#号替换为单引号
    $db->dbClose();
?>

11. Modify the data in the table

<?php
    $update
 = $db->update("user","nikename
 = #beyondwebcn#","where
 id = #2#");//请把#号替换为单引号
    $db->dbClose();
?>

12. Query the data in the table and output it

<?php
    $select
 = $db->select("user");
    $row
 = $db->rows($select);
    if($row>=1){
?>
<table
 border="1px">
    <tr>
        <th>id</th>
        <th>nikename</th>
        <th>email</th>
    </tr>
<?php
    while($array
 = $db->myArray($select)){
        echo
"<tr>";
        echo
"<td>".$array[#id#]."</td>";//请把#号替换为单引号
        echo
"<td>".$array[#nikename#]."</td>";//请把#号替换为单引号
        echo
"<td>".$array[#email#]."</td>";//请把#号替换为单引号
        echo
"</tr>";
    }
?>
</table>
<?php
    }else{
        echo
"查不到任何数据!";
    }
      
    $db->dbClose();
?>

13. Delete the data in the table

<?php
    $delete
 = $db->delete("user","where
 nikename = #beyondweb#");//请把#号替换为单引号
    $db->dbClose();
?>

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