mysql

Wildcard searching of encrypted data in a MySQL database?

由 放肆的年华 提交于 2021-02-07 12:54:17
问题 I am in the process of building a small web application which will hold around 10 pieces of information for every person inserted. Due to data protection the majority of this information must be encrypted. Using the CodeIgniter framework and the CodeIgniter encryption class I can encode the information on the application side before storing it in the database. The CodeIgniter encryption class uses PHP's mcrypt function along with the AES_256 cipher. The problem I have is that I need to allow

Passing Variable to GoLang Query

由 本小妞迷上赌 提交于 2021-02-07 12:49:17
问题 first off let me say I'm a beginner (started a few days ago) with golang and am in the process of learning how to practically apply the language. My goal is to build a web Rest API that queries a database and provides data back to the user. I've been able to successfully create a simple API using martini (https://github.com/go-martini/martini) and connect to a MySQL database using https://github.com/go-sql-driver/mysql. My problem at the current moment is how to pass a variable param from the

Cant retrieve column value from Laravel's Eloquent when primary key is varchar

由 对着背影说爱祢 提交于 2021-02-07 12:24:18
问题 I encountered an issue where my Laravel's Eloquent Model does not give me the value of the column called 'id' it just turn to be an integer (0) instead of a string. I though the column was somehow protected but in other Models where the 'id' is an intenger it return the value just fine. Question: Can't I use VARCHAR for primary keys? Note: I have to create more tables with respective models where the primary key need to be a string; I'm kinda new Laravel Migration: Schema::create('country',

你所不知道的Java十种经典排序算法

由 痞子三分冷 提交于 2021-02-07 12:15:02
算法分类 比较排序：在排序的最终结果里，元素之间的次序依赖于他们之间的比较，每个数必须和其他数进行比较，才能确定自己的位置。 优势：适用于一切需要排序的情况。不在乎数据的分布，适用于各种规模的数据 冒泡排序、快速排序、插入排序、希尔排序 、堆排序、选择排序、归并排序。 在冒泡排序之类的排序中，问题规模为n，又因为需要比较n次，所以平均时间复杂度为O(n²)。在归并排序、快速排序之类的排序中，问题规模通过分治法消减为logN次，所以平均时间复杂度为O(nlogn)。 非比较排序：只要确定每个元素之前的已有的元素个数即可，所有一次遍历即可解决。时间复杂度为O(n)。 计数排序、基数排序、桶排序。 非比较排序的时间复杂度低，但是需要占用空间来确定唯一的位置。 递归factorial 方法内部调用方法本身 ⚠️递归的层级太深容易造成栈内存溢出stackOverFlowError 冒泡排序 一次比较相邻的两个元素，如果第一个比第二个大就交换它们两个。 从第一对到结尾的最后一对，重复比较。 重复前面两个步骤（每次都能找到一轮中的最大值）。 算法分析： 最佳情况：T(n) = O(n) 最差情况：T(n) = O(n²) 平均情况：T(n) = O(n²) public static int [ ] bubbleSort ( int [ ] array ) { if ( array .

PDO bindValue with \PDO::PARAM_BOOL causes statement execute to fail silently

由 痴心易碎 提交于 2021-02-07 12:11:38
问题 In one server setup I experience very strange error. There's PHP 5.3.6 with PDO Driver for MySQL, client library version 5.1.61. Everything is compiled by hand. When I bind params with bindValue and set third parameter as \PDO::PARAM_BOOL then statement execute return false and nothing happens (no data inserted to MySQL, even no exception at all). When I don't use third parameter it goes well. In fact I can't ommit third parameter, bacues Doctrine2 DBAL sets it while converting parameters...

REPLACE versus INSERT in SQL

由 醉酒当歌 提交于 2021-02-07 11:17:10
问题 I am doing the following SQL tutorial: http://sql.learncodethehardway.org/book/ex11.html and in this exercise the author says in the second paragraph: In this situation, I want to replace my record with another guy but keep the unique id. Problem is I'd have to either do a DELETE/INSERT in a transaction to make it atomic, or I'd need to do a full UPDATE. Could anyone explain to me what the problem is with doing an UPDATE, and when we might choose REPLACE instead of UPDATE? The UPDATE code:

REPLACE versus INSERT in SQL

由 梦想与她 提交于 2021-02-07 11:15:32
问题 I am doing the following SQL tutorial: http://sql.learncodethehardway.org/book/ex11.html and in this exercise the author says in the second paragraph: In this situation, I want to replace my record with another guy but keep the unique id. Problem is I'd have to either do a DELETE/INSERT in a transaction to make it atomic, or I'd need to do a full UPDATE. Could anyone explain to me what the problem is with doing an UPDATE, and when we might choose REPLACE instead of UPDATE? The UPDATE code:

ErrorException: Indirect modification of overloaded property App\Answer::$attribute has no effect

由 我怕爱的太早我们不能终老 提交于 2021-02-07 10:55:02
问题 I get this exception when Answer model I am trying to change value of 'ans' attribute from my answers table database. public function setAnsAttribute($ans){ } ErrorException: Indirect modification of overloaded property App\Answer::$attribute has no effect 回答1: The setAnsAtribute method has no code? If you have code, please add more code to see what is happening. Thank you. If you do not have a code, I will indicate it below. I refer you to the Laravel Mutators page so you can see the example

ErrorException: Indirect modification of overloaded property App\Answer::$attribute has no effect

由 丶灬走出姿态 提交于 2021-02-07 10:54:35
问题 I get this exception when Answer model I am trying to change value of 'ans' attribute from my answers table database. public function setAnsAttribute($ans){ } ErrorException: Indirect modification of overloaded property App\Answer::$attribute has no effect 回答1: The setAnsAtribute method has no code? If you have code, please add more code to see what is happening. Thank you. If you do not have a code, I will indicate it below. I refer you to the Laravel Mutators page so you can see the example

ErrorException: Indirect modification of overloaded property App\Answer::$attribute has no effect

由 怎甘沉沦 提交于 2021-02-07 10:54:32
问题 I get this exception when Answer model I am trying to change value of 'ans' attribute from my answers table database. public function setAnsAttribute($ans){ } ErrorException: Indirect modification of overloaded property App\Answer::$attribute has no effect 回答1: The setAnsAtribute method has no code? If you have code, please add more code to see what is happening. Thank you. If you do not have a code, I will indicate it below. I refer you to the Laravel Mutators page so you can see the example
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