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MySqlConnector: MySqlBulkLoader class. Upload empty data from csv to MySQL table

From MySqlConnector.MySQLBulkLoader class I want to convert csv to MySQL table keeping null values.

P粉398117857 2024-04-06 14:35:18 0  1  1018

Solve the problem of operation error when pythonanywhere connects to MySQL database

I have finished my django project and I want to test it on PythonAnywhere, everything was fine until the mysql database connection showed an error to which I have paid subscription. An operation error occurred on /home/ (1044, "Access to database 'almx98' for user 'almx98'@'%' is denied") ...

P粉459440991 2024-03-31 22:43:19 0  1  686

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

syntax - C++11 thread calls member function of object

If you drop a member function of a class, it's probably like this. {Code...} But what if you want a specific object of this class to perform this operation?

迷茫 2017-05-16 13:22:21 0  2  1173

The test database operation class db statically calls the getInstance method.

In the entry file idnex.php, new base.php calls the run method. How to complete the connection to the database in base.php. I don't see an instance of the db class in the code. Can any kind person explain this to me? Thanks!

航航 2022-08-18 17:23:59 0  1  934

Return value of transaction commit?

Db::commit() can use if (Db::commit()) {Operation only if MySQL operation is successful}

不屑一顧 2018-05-10 17:44:41 0  0  831

How to use PDO connection in other class?

I think I have a problem understanding how OOP works. I've changed the code so it works, but it's not the right way I think. Following scenario (no, I'm not creating the user login myself, it's really just for local developers to understand OOP better): I have a database.php file: classDatabase{/*Pr...

P粉548512637 2023-10-23 09:37:51 0  1  898

Why do PDO and PDOStatement exist at the same time? What are the considerations for this design?

Problem description: We all know that since PHP 5.1.0, PDO has been a standard part of PHP. PDO provides three classes: PDO, PDOStatement and PDOException. Needless to say, the PDOException class depends on its name for function and positioning. It's all clear. So the question comes: why at the same...

我想大聲告訴你 2017-05-16 13:11:25 0  3  867

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

MySQL operation guide using UNION and LIMIT

So, I have this problem at hand. I have to get multiple records from different tables using inner join and using UNION or UNIONALL for pagination, below code is used to get all records and count. This is my nemesis: (SELECTpp.idasid,pp.*,i.name,p.nameasplans_name,u.username,u.email,u.phone,DATE_ADD(...

P粉680487967 2023-09-08 12:39:10 0  1  616

MySQL operation to get maximum sum function

I'm trying to set the maximum quantity to "max" and I'm getting the error: Error code: 1111. Invalid use of group function 0.000 seconds SELECTmax(count(*))asmaxFROMticketgroupbyfan_fan_id; I'm not sure what the problem is here and I'd be happy to get some help here - and I need to solve i...

P粉139351297 2024-04-04 17:49:26 0  1  675

mysql - Problems with coherent operation in ThinkPHP3.2.3?

代碼 SQL語句為SELECT crsIpint,crsIpout,crsName,wfdz,CheckStatus,0 AS flag FROM vehicle.crossing AS t1 LEFT JOIN ( SELECT * FROM caminfo.devs_ip_status WHERE type = 95 ) AS t2 ON( t1.crsId = t2.Devi...

過去多啦不再A夢 2017-07-05 10:46:05 0  3  1033

Database pdo connection problem

<?php try{ $pdo = new PDO("mysql:127.0.0.1:3306;dbname='blogs';charset=utf8mb4",'root',''); echo "pdo connection successful".""; }catch(Exc

移動用戶-1547390 2020-11-15 18:12:58 0  4  1146

javascript - jquery selects one of the buttons of the same class to perform an operation.

{Code...} ".parButton" There are multiple Buttons. This will allow the currently clicked one to be selected. Why when I execute this line of code, the first ".parButton" Button is always executed multiple times.

漂亮男人 2017-06-30 09:57:35 0  1  982

Can't use constants with empty()?

parent::_initialize();// Inherit the initialization operation in the parent class. It is different from what the teacher said. In addition, if(empty(USER_ID)) reports an error, if(USER_ID!=null) can.

劉磊 2018-11-01 16:04:04 0  2  1527

javascript - Does Firefox not support bootstrap tooltip? It's good in Google

&lt;button type="button" class="btn btn-link General-fontsize custom-btn operation-icon-margin" ng-disabled="!vm.startEnabled" ng-click="vm.openDialog('start')&q

某草草 2017-05-19 10:10:03 0  1  828

javascript - Can I use setAttribute/removeAttribute to add or delete class names?

In a group discussion about the operation of class names in native js, someone suggested that the setAttribute and removeAttribute methods can be used to operate class names. I felt very puzzled: I thought there were only classList.add() or classList.remove(). Methods can solve this need, but someon...

過去多啦不再A夢 2017-05-19 10:46:49 0  3  1135

LastInsertId() returns a problem. I tested it and found that when deleting and modifying, lastInsertId() returned "0", so use if(null!== $this->xxx->lastInsertId()){} to judge. Can't distinguish between insertion, deletion and addition? Is there still something wrong with my test code? Can someone who knows please answer it? Thank you) [Using singleton mode]

class MyDb{.......public function test($sql){ ? ?$this->affect_nums = $this->pdo->exec($sql);//影響行數(shù) ? ?if ($this->affect_nums>0) { ? ? ? ?$this-&

黃粱一夢夢黃梁 2019-07-23 22:07:47 0  1  1273

When running the article classification function, it prompts that the database PDO preprocessing operation failed.

public function query($sql,$batch=false){        $data=$batch?$this->data:array($this->data);        $this->data=array();        //

D 2019-05-29 11:16:32 0  0  1266

After adding parent::initialize();, an error is reported

protected function _initialize(){ parent::initialize();//Inherit the initialization operation in the parent class define('USER_ID', Session::get('user_id')); } In the Base controller, parent is added: :initialize(); This sentence reports an error. Why is this?

phpcn_u43886 2017-10-24 11:23:23 0  4  1577