前言：在后臺開發(fā)中絕對避免不了要關(guān)系型數(shù)據(jù)庫管理系統(tǒng)。常見的數(shù)據(jù)庫管理系統(tǒng)有MySql、SQLServer、Oracle等。

其中Mysql是最常用的數(shù)據(jù)庫管理系統(tǒng)。

推薦mysql相關(guān)視頻教程：https://www.php.cn/course/list/51/type/4.html

今天就為大家介紹一下Mysql。

以后會陸續(xù)為大家總結(jié)整理相關(guān)知識，謝謝！

官網(wǎng)下載地址：https://dev.mysql.com/downloads/mysql/

注意：安裝數(shù)據(jù)庫過程中，我們需要開啟管理員權(quán)限來安裝，否則會由于權(quán)限不足導(dǎo)致無法安裝。

1、 創(chuàng)建數(shù)據(jù)表

語法：create table 表名 (字段1，字段2...);

使用PHP腳本創(chuàng)建數(shù)據(jù)表：

<?php //配置數(shù)據(jù)庫信息 $localhost = 'localhost'; $username = 'zmz'; $password = '20040315'; $dbname = 'zmz'; $port = 3306;  //連接數(shù)據(jù)庫 $conn = mysqli_connect($localhost,$username,$password,$dbname,$port); //檢查連接 if(mysqli_connect_errno($conn)) { die('連接失敗！'.mysqli_connect_error()); } //創(chuàng)建數(shù)據(jù)表 $sql = "CREATE TABLE demo02(id SMALLINT(10) PRIMARY KEY, age TINYINT(3), name VARCHAR(10))CHARSET=utf8"; $query = mysqli_query($conn, $sql); //判斷是否創(chuàng)建成功 if(!$query) { die('創(chuàng)建失??！'.mysqli_error($conn)); } //釋放內(nèi)存 mysqli_free_result($query); //關(guān)閉連接 mysqli_close($conn); ?>

2、刪除數(shù)據(jù)表

語法：drop table 表名;

使用PHP腳本刪除數(shù)據(jù)表：

<?php //配置數(shù)據(jù)庫信息 $localhost = 'localhost'; $username = 'zmz'; $password = '20040315'; $dbname = 'zmz'; $port = 3306;  //連接數(shù)據(jù)庫 $conn = mysqli_connect($localhost,$username,$password,$dbname,$port); //檢查連接 if(mysqli_connect_errno($conn)) { die('連接失??！'.mysqli_connect_error()); } //刪除數(shù)據(jù)表 $sql = "DROP TABLE runoob_tbl"; $query = mysqli_query($conn, $sql); if(!$query) { die('刪除失??！'.mysqli_error($conn)); } //釋放內(nèi)存 mysqli_free_result($query); //關(guān)閉連接 mysqli_close($conn); ?>

3、插入數(shù)據(jù)

語法：insert into 表名(字段1，字段2...)values(value1,value2...);

使用PHP腳本插入數(shù)據(jù)：

<?php //配置數(shù)據(jù)庫信息 $localhost = 'localhost'; $username = 'zmz'; $password = '20040315'; $dbname = 'zmz'; $port = 3306;  //連接數(shù)據(jù)庫 $conn = mysqli_connect($localhost,$username,$password,$dbname,$port); //檢查連接 if(mysqli_connect_errno($conn)) { die('連接失?。?#39;.mysqli_connect_error()); } //插入數(shù)據(jù) $sql = "INSERT INTO demo02(id,age,name) VALUES(4,20,'mm')"; $query = mysqli_query($conn,$sql); //var_dump($query); //die(); //判斷是否插入成功 if(!$query) { die('插入失??！'.mysqli_error($conn)); } //釋放內(nèi)存 mysqli_free_result($query); //關(guān)閉連接 mysqli_close($conn); ?>

4、查詢數(shù)據(jù)

語法：select * from table;

使用PHP腳本查詢數(shù)據(jù)：

<?php //配置數(shù)據(jù)庫信息 $localhost = 'localhost'; $username = 'zmz'; $password = '20040315'; $dbname = 'zmz'; $port = 3306;  //連接數(shù)據(jù)庫 $conn = mysqli_connect($localhost,$username,$password,$dbname,$port); //判斷連接 if(mysqli_connect_errno($conn)) { die('連接失??！'.mysqli_connect_error()); } //查詢數(shù)據(jù) $sql = "SELECT * FROM demo02"; $query = mysqli_query($conn, $sql); //判斷是否查詢成功 if(!$query) { die('查詢失?。?#39;.mysqli_error($conn)); } echo 'mysql查詢語句'; echo '<table border=1>'; echo '<tr> <td>id</td> <td>age</td> <td>name</td> </tr>'; //循環(huán)數(shù)據(jù) while($row = mysqli_fetch_assoc($query)) { echo '<tr> <td>'.$row['id'].'</td> <td>'.$row['age'].'</td> <td>'.$row['name'].'</td> </tr>'; } echo '</table>'; //釋放內(nèi)存 mysqli_free_result($query); //關(guān)閉連接 mysqli_close($conn); ?>

5、update更新語句

語法：update 表名 set field1 = new value;

使用PHP更新數(shù)據(jù)

<?php //配置數(shù)據(jù)庫信息 $localhost = 'localhost'; $username = 'zmz'; $password = '20040315'; $dbname = 'zmz'; $port = 3306;  //連接數(shù)據(jù)庫 $conn = mysqli_connect($localhost,$username,$password,$dbname,$port); //檢查連接 if(mysqli_connect_errno($conn)) { die('連接失?。?#39;.mysqli_connect_error()); } //更新數(shù)據(jù) $sql = "UPDATE demo02 SET name='zylmy' WHERE id=1"; $query = mysqli_query($conn, $sql); //var_dump($query); //die(); //判斷是否更新成功 if(!$query) { die('更新失??！'.mysqli_error($conn)); } //關(guān)閉連接 mysqli_close($conn); ?>