数据库和胶水语言php的对话

MYSQL数据库操作基本命令：

Login database：
mysql -h 127.0.0.1 -u username -p admin
Watch database/tables：
show databases;
show tables;
watch tables-type:
desc table-name;
query table structure：
Select * from table-name;
Import sql-decument
source sql文件的路径;
create-tabels-e.g
create table ming( id int not null auto_increment , name int default null,primary key(id) );
CREATE TABLE employee (id int(10),name char(20),phone int(12));

Insert-date：
insert into table-name values (1,1);
INSERT INTO employee(id,name,phone) VALUES(01,‘Tom’,110110110);

数据类型是 CHAR 、VARCHAR,TEXT,DATE,TIME,ENUM 等类型的数据也需要单引号修饰，而
INT,FLOAT,DOUBLE 等则不需要

Alter-date
alter table table-name add( or drop) 字段名类型修饰 after 某列【把新列加在某列后面】
alter table ming add age int (20) after name;
update user set name=新值 where id=1
delete-date
Drop databases-name/tables-name;
Delete from table-name where id =1;
Date-type

整数: tinyint、smallint、mediumint、int、bigint 浮点数:
float、double、real、decimal 日期和时间: date、time、datetime、timestamp、year
字符串: char、varchar 文本: tinytext、text、mediumtext、longtext
二进制(可用来存储图片、音乐等): tinyblob、blob、mediumblob、longblob

mysql脚本
Ubuntu 错误更改
1 sql语句不区分大小写。
2 引入``反引号区分关键字和普通字符。error 1064
3 数据库名称错误或没有创建。error1146
error 数据输出

<?php
    // 创建连接
    if($con = mysqli_connect("127.0.0.1","apple","111111", "test")){
        echo  'connected';
    }else{
        echo  'fail';
    }
    // 检测连接
    $sql = 'select * from article';
    $query =mysqli_query($con,$sql);
    while ($first=mysqli_fetch_assoc($query)) {
    	$list[] =$first;
    }
    foreach($list as $key=>$row){
      echo "<hr/>";
      echo "<tr>";
		echo "<p> 编号:<td>{$row['id']}&nbsp </td></p> ";
		echo "<p>文章标题：<td>{$row['title']}</td></p> ";
		echo "<p>文章作者：<td>{$row['author']}</td></p> ";
		echo "<p>上传时间：<td>{$row['addtime']}</td></p> ";
		echo "<p>文章内容：<td>{$row['content']}</td></p> ";
		echo "<p><td>提交 下载 删除 批示</td></p> </br>";
		echo "<tr>";
      echo "<hr/>";
}
?>

数据输入
html

``new3.php`

<?php $title=$_POST['title']; $author=$_POST['author']; echo $title; $link = @mysql_connect('127.0.0.1','root','admin','test'); if (!$link){ die('Could not connect to MySQL: ' . mysql_error()); }else{ echo "MySQL connection-->"; $result =@mysql_select_db("test"); if($result){ echo "database has been linked-->"; }else{ echo "Not link"; } if($title == "" || $author == "" ) { echo ""; } } } mysqli_close($con); ?>

**article.sql**

/*
Navicat MySQL Data Transfer

Source Server : local
Source Server Version : 50067
Source Host : localhost:3306
Source Database : test

Target Server Type : MYSQL
Target Server Version : 50067
File Encoding : 65001

Date: 2020-06-19 11:18:17
*/

SET FOREIGN_KEY_CHECKS=0;

– Table structure for article

DROP TABLE IF EXISTS article;
CREATE TABLE article (
aid int(255) NOT NULL auto_increment,
title char(255) NOT NULL,
author char(255) NOT NULL,
PRIMARY KEY (aid)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

– Records of article


可能有些许错误，各位同行指正。

数据库和胶水语言php的对话

MYSQL数据库操作基本命令：

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