Query the data of a specified date in a specified table in mysql database? There are details

{Code...} The above is the existing query statement, which can find all the tables in the entire database and how much data is in the table. Now I want to break it down: For example, there are 1,000 tables in the test database, and I only want to check 200 of them (specified) that contain the specif...

PHP中文网 2017-05-18 10:49:37 0  2  1009

Data Structure - Problems with pointer array assignment in C++?

As the title says, I defined a two-dimensional pointer array in Figure 1. The content of each pointer pointing to the address in the two-dimensional array should be 1000. I later printed out this two-dimensional pointer, and it was indeed 1000; in the next picture In the algorithm in the picture, I ...

曾经蜡笔没有小新 2017-05-16 13:21:23 0  1  643

When the C/C++ language printf function outputs the value of the array pointed to by the pointer, why does the value of the pointer change like this?

1. In what order are the parameters of the prinf function containing pointer expressions calculated? The result of the code operation is obviously not from left to right. {code...}

大家讲道理 2017-06-27 09:18:57 0  4  1498

javascript - Array deletes any specified number in the array

I need to delete any specified number in [1,2,3,4,5]. How to do it? For example, if you want to delete 2, the result returned is [1,3,4,5]

大家讲道理 2017-07-05 10:41:17 0  3  887

How to get matching results based on specified conditions in specified JSON data?

How to get matching results based on specified conditions in specified JSON data?

不言 2018-10-23 17:22:57 0  2  1207

How to update/delete two or more specified pieces of data

How to update/delete two or more specified pieces of data? All I know now is that multiple pieces of data with the same conditions can be deleted at the same time. But I don’t know how to delete multiple specified pieces of data at the same time. For example: I want to delete two pieces of data with...

王先生 2019-10-31 11:26:08 0  2  1243

Vue 3 - Specifying the type of components and props when using them as function parameters

In Vue3, I'm creating a function that will accept an instance of a component and a property to be passed. I'm also using TypeScript and wondering if it's possible to enter these parameters. For example, the function would look like: constexample=(component,props)=>{//}; So my question is: How do ...

P粉709644700 2024-01-05 23:55:40 0  1  504

MySQL NODEJS: A Complete Guide to Creating Databases and Related Tables

I'm setting up a mysql/nodejs application. I want to drop the database, recreate the database, and create the tables every time the server restarts. If I specify the connection to the database: letcon=mysql.createConnection({host:"localhost",user:"root",password:"pass",...

P粉682987577 2023-08-26 14:44:38 0  1  520

How to query the 5 pieces of data starting with a specified ID in laravel5.2?

For example, there are 10 pieces of data with IDs 1-10. Now I want to query the 5 pieces of data after the specified ID based on the passed ID. For example, if the input ID is 1, the query IDs are 1, 2, 3, and 4. ,5 data, if the incoming id is 3, how to query the data with id 3,4,5,6,7? Thank you

ringa_lee 2017-05-16 16:48:32 0  2  411

javascript - How to specify a function function in the data attribute of html5?

Could you please specify a function function in the data-* attribute? For example, if I write like this, I will get an error formatter is not a function: {code...}

学习ing 2017-06-24 09:43:53 0  6  1033

When calling a function directly, this points to the global object windows. What is this?

When calling a function directly, this points to the global object windows. What is this?

13月32号 2019-03-28 09:38:48 0  0  989

PHP gets the data and sends it to the specified tag.

The value obtained by function success_msg($data=array()){$arr = $data;} is as follows. [result_code] => SUCCESS [return_code] => SUCCESS [return_msg] => OK Please tell me how to get the data here and send it to the specified label. For example, the result code is displayed on the page like...

小Q 2017-10-19 22:34:08 0  1  1094

javascript - Ajax requests background data through the interface. When to use put, get, and post? Please give advice.

Ajax requests background data through the interface. Please give me some advice on when to use put, get, and post.

滿天的星座 2017-05-19 10:25:20 0  7  474

Problem with JAVASCRIPT constructor and prototype pointing to each other? Help! ! !

Recently, I have seen the problem of js prototype, and I basically understand it, but I found a very strange problem when opening it in the console. For example, {code...} enter the code in the control. It stands to reason that {code...} Persion.prototype prototype The constructor of the object poin...

大家讲道理 2017-07-05 10:43:41 0  4  924

javascript - How to find a number among many numbers

To find out whether a certain number is among four billion numbers, you certainly can't use a big loop, right? . . The amount of data is too large. Please give me some advice.

高洛峰 2017-05-19 10:14:02 0  2  507

php json_encode function encrypts a two-dimensional array and returns false!!!!!????

The php json_encode function encrypts a two-dimensional array and returns false!!!!!???? Why is this? Please give me some advice.

..... 2018-08-03 17:42:23 0  3  1519

database

Connect to the database without specifying a data table? I have three tables in it. How does it know which one to use? Is it because of this reason that the effect cannot come out?

铁力瓦尔良 2021-05-18 15:01:43 0  1  1070

javascript - What is the difference between js writing plug-ins using object-oriented programming and ordinary functions

For example, if I write a tab, using the oriented programming method is more complicated than ordinary function encapsulation, but it can also achieve code reuse. Why do so many people choose to use object-oriented programming plug-ins? What is the biggest difference between oriented programming and...

曾经蜡笔没有小新 2017-06-13 09:23:21 0  3  1006

Title rewritten to: "Invalid argument: The argument supplied to foreach() is invalid"

It's common for me to deal with data that can be either an array or an empty variable, and feed that data to some foreach. $values=get_values();foreach($valuesas$value){...} When you provide data that is not an array to foreach, you will receive a warning: Warning:Invalidargumentsuppliedforforeach()...

P粉546138344 2023-08-21 12:14:09 0  2  441