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How to use mysqli to determine whether a MySQL database exists in PHP?

How to use the mysqli statement in PHP to accurately determine whether a MySQL database exists? In addition, how to determine whether a table in the database exists? In addition, what do the two styles provided in the official PHP documentation mean? Object-oriented style and process-oriented style....

淡淡煙草味 2017-06-14 10:49:52 0  1  1145

When inserting data encapsulated by the PHP class, the insertion is always unsuccessful and false is returned;

<?php //Database operation class class Model{ Private $host; //Database address Private $user; //Database username Private $pwd; /

A _ Ｑ _ｉ_ 2021-10-13 10:21:27 0  6  1132

I refresh the PHP page directly and can delete the numeric fields in the MYSQL database, but cannot delete the letter or URL fields?

I directly refresh the PHP page and can delete the numeric fields in the MYSQL database, but I cannot delete the letter or URL fields.

我就是我 2018-05-14 11:49:58 0  1  2323

tp5.1 Why does it sometimes show that the database cannot be found when connecting to mysql in the php toolbox, but sometimes the connection is successful?

tp5.1 Why does it sometimes show that the database cannot be found when connecting to mysql in the php toolbox, and sometimes it can connect successfully. The error display is the page that often appears. When it succeeds, it can connect to the database successfully, and the data inside can be read....

對方正在輸入。。。 2018-11-29 10:34:13 0  0  1083

After cross-class call, method cannot be found

Do static method overloading to achieve chained access to the database exercise demo5.php references the Query.php class and then accesses the method in Query. The page prompts me that the method 'table' is not found in the Database. The following is the source code. I hope it can help. The first er...

方人胥 2021-06-12 17:16:18 1  2  1201

How to build cross database query in PHP?

In our last episode (How to Build Cross-Database Queries in MySQL), I learned how to build cross-database queries in MySQL. This worked great, but when our hero tried to use this newfound knowledge in PHP, he found that his best friend failed. I looked into PHP's mysql_select_db. This seems to mean ...

P粉197639753 2023-10-22 11:40:00 0  2  829

How to remove blob pictures from mysql

How to display blob pictures stored in mysql database on php, it is best to have a complete example

(O_O) 2018-02-08 14:59:03 1  2  1655

PHP automatically performs the login operation after discovering that the login has expired, and then continues the previous step.

Conditions: There is a third-party website, and every step of the operation needs to be logged in. Now I have built a simple front-end page and used PHP to make a springboard in the middle. Process: Every request on the page I built is transmitted to the PHP springboard through ajax, and then the PH...

暖暖橙 2022-06-13 15:06:16 0  1  1385

How to configure mysql remote php external network link database

$con = mysql_connect("47.107.159.50:3306","root","root"); After using phpstudy to configure the mysql database on the Alibaba Cloud host, the php code is linked to the database. How to fill in the database address?

、‘（）’ 2019-01-12 11:09:47 0  3  1360

Laravel: Error [PDOException]: Driver not found in PostgreSQL

Translate: "I'm trying to connect with PostgreSQL database through Laravel in order to do a PHP artisan migrate, but it doesn't seem to be directed since it's reading the database name of MySQL.

P粉722409996 2023-07-31 18:16:43 0  2  1127

jsonp - The background php returns json. The local test Chinese display is normal, but the server Chinese becomes a question mark.

The back-end PHP gets the data from the MySQL database, and the output is in json format and transmitted to the front desk. The PHP files on the local and server are connected to the same database. During the local test, the json return data is normal in Chinese, but the json return data on the serv...

過去多啦不再A夢 2017-05-16 13:01:57 0  1  639

Created login database with PHP, cannot see it in MySQL

<?phpheader("Content-type:text/html;charset=utf-8");? ? //設置編碼$servername = "localhost";$username = "root";$password = "1234";$dbname = "login

LinXY 2019-03-07 15:38:33 0  2  1094

I would like to ask if PHP can read the mssql record set directly and store it directly into an array? Thank you

It used to be asp, but now it is transferred to php. For example, $sql = "SELECT * FROM abcDB"; //Record 20 records. How to get a two-dimensional record set and store it in an array at one time. Reason: After the database operation is completed, I want to disconnect. The data is slowly cir...

stock2 2019-04-27 20:02:10 0  1  1079

css - MYSQL large number of connections delayed execution

In the face of a large number of page links, MYSQL has a phenomenon similar to self-protection. Originally, for an operation such as insert xx, there may be more than 100 connections to insert in one second, and then the database will suppress these 100 inserts and not execute them. Then, for exampl...

淡淡煙草味 2017-05-02 09:32:45 0  0  766

Can PHP directly call functions in a class without using new?

I have to do something new every time, which is very unaccustomed. Can I use the functions in the class directly? The purpose of using the class is to look at the static attributes inside, so that when operating redis or mysql, automatic connection and connection reuse can be realized without the ne...

只爭朝夕 2022-12-23 12:12:24 0  1  2058

What is the default database name prefix in the php toolbox?

What is the default database name prefix in the php toolbox or where to view it. The following is the copied content information database name: root Which database should WordPress be installed to? Username: root Your MySQL username Password root...and its password Database host: 127.0.0.1 If localh...

彭離元 2019-07-08 02:23:41 0  1  1288

Example of relationship involving multiple entities

I haven't found any examples of MYSQL many-to-many relationships neither here nor in Google. What I'm looking for is a very simple example where php+mysql displays results from a database. Can someone write a very simple example?

P粉327903045 2023-08-27 21:44:53 0  2  610

How to write in PHP to log in to different pages with different usernames and passwords

As a novice, I originally imagined that when adding a user, I would select the value of value, enter the username and password when logging in, and at the same time determine whether the value of the selected value is 0 or 1. When entering different pages, the name of value saved in the database is ...

TimeLimit 2018-06-17 13:51:17 0  1  1432

How does MySQL PHP read data cyclically from the database in batches?

If five items are read from the database each time, how should the program continue to loop until all loops are completed? Is the logic of adding {code...} correct?

迷茫 2017-07-01 09:11:51 0  2  888

I would like to ask: Why does PHP only calculate the addition of two pieces of data? How can you find the sum of all numbers?

This is the template of finecms. There is such a loop, which displays the transaction information posted by members. Each information has replies from other members. This reply contains the amount, and an operation is written in PHP (just for display, (not written to the database), but it only calcu...

劉暢 2020-08-31 18:35:16 0  1  1117