更新数据库的有关问题
更新数据库的问题
用while把数据库里的数据全读到了text里，怎么能改完text里面的数据，全部text的数据都更新到数据库
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In C language, what is the difference between while(1) and while(0)?
Aug 31, 2023 am 10:45 AM
We know that in C language, 'while' keyword is used to define a loop that works based on the condition passed to the loop. Now, since the condition can have two values, true or false, the code inside the while block will be executed repeatedly if the condition is true and will not be executed if the condition is false. Now, by passing parameters to the while loop, we can differentiate between while(1) and while(0) because while(1) is a loop where the condition is always considered true and hence the code inside the block will start executing repeatedly. Furthermore, we can state that it is not 1 that is passed to the loop that makes the condition true, but if any non-zero integer is passed to the while loop, then it will be considered as the true condition, so
What is the difference between using foreach and iterator to delete elements when traversing Java ArrayList?
Apr 27, 2023 pm 03:40 PM
1. The difference between Iterator and foreach is the polymorphic difference (the bottom layer of foreach is Iterator) Iterator is an interface type, it does not care about the type of collection or array; both for and foreach need to know the type of collection first, even the type of elements in the collection; 1. Why is it said that the bottom layer of foreach is the code written by Iterator: Decompiled code: 2. The difference between remove in foreach and iterator. First, look at the Alibaba Java Development Manual, but no error will be reported in case 1, and an error will be reported in case 2 (java. util.ConcurrentModificationException) first
How to determine the number of foreach loop in php
Jul 10, 2023 pm 02:18 PM
The steps for PHP to determine the number of the foreach loop: 1. Create an array of "$fruits"; 2. Create a counter variable "$counter" with an initial value of 0; 3. Use "foreach" to loop through the array, and Increase the value of the counter variable in the loop body, and then output each element and their index; 4. Output the value of the counter variable outside the "foreach" loop to confirm which element the loop reaches.
PHP returns an array with key values flipped
Mar 21, 2024 pm 02:10 PM
This article will explain in detail how PHP returns an array after key value flipping. The editor thinks it is quite practical, so I share it with you as a reference. I hope you can gain something after reading this article. PHP Key Value Flip Array Key value flip is an operation on an array that swaps the keys and values in the array to generate a new array with the original key as the value and the original value as the key. Implementation method In PHP, you can perform key-value flipping of an array through the following methods: array_flip() function: The array_flip() function is specially used for key-value flipping operations. It receives an array as argument and returns a new array with the keys and values swapped. $original_array=[
PHP returns the current element in an array
Mar 21, 2024 pm 12:36 PM
This article will explain in detail about the current element in the array returned by PHP. The editor thinks it is very practical, so I share it with you as a reference. I hope you can gain something after reading this article. Get the current element in a PHP array PHP provides a variety of methods for accessing and manipulating arrays, including getting the current element in an array. The following introduces several commonly used techniques: 1. current() function The current() function returns the element currently pointed to by the internal pointer of the array. The pointer initially points to the first element of the array. Use the following syntax: $currentElement=current($array);2.key() function key() function returns the array internal pointer currently pointing to the element
What is the difference between foreach and for loop
Jan 05, 2023 pm 04:26 PM
Difference: 1. for loops through each data element through the index, while forEach loops through the data elements of the array through the JS underlying program; 2. for can terminate the execution of the loop through the break keyword, but forEach cannot; 3. for can control the execution of the loop by controlling the value of the loop variable, but forEach cannot; 4. for can call loop variables outside the loop, but forEach cannot call loop variables outside the loop; 5. The execution efficiency of for is higher than forEach.
Usage of while
Sep 25, 2023 am 09:47 AM
The usage of while is "while condition: code block". The condition is an expression. When the condition is true, the code block is executed, and then it is judged again whether the condition is true. If it is true, the code block continues to be executed until the condition is false. . while is a commonly used loop control statement, used to repeatedly execute a block of code when certain conditions are met.
Is while a keyword in go language?
Jun 04, 2021 pm 05:01 PM
In the Go language, while is not a keyword. You can use the for statement plus break to achieve the effect of a while loop, such as "for {sum++ if sum>10{break}else{...}}". The go language has 25 keywords such as break, default, func, select, case, defer, go, map, else, goto, for, if, var, etc.
