mysql

How to use implement AES_DECRYPT() of MySQL by Python

由 喜你入骨 提交于 2021-02-08 08:14:04
问题 I am trying to write a python code which has same functionarities of AES_ENCRYPT and AES_DECRYPT of MySQL. https://dev.mysql.com/doc/refman/5.6/ja/encryption-functions.html I want to encrypt and decrypt data between MySQL and Python. For example, I want to decrypt data by python, which is encrypted by AES_ENCRYPT of MySQL. And I want to decrypt data by AES_DECRYPT of MySQL, which is encrypted by Python vice versa. I found a example of AES_ENCRYPT in Python. https://www.maykinmedia.nl/blog

How to pass several resultsets for single report using JasperReports?

由 佐手、 提交于 2021-02-08 08:09:56
问题 In my report I have a set of fields and two datasets. I want to execute three procedure at a time to run a report. First procedure for execute set of fields and remaining two procedure for datasets. I pass one resultset to execute a report is working fine. But I want to pass two more resultset from execute() and port() methods. Is it possible to pass multiple resultset using JRResultSetDataSource or any other option? public ResultSet execute() throws ClassNotFoundException { Statement stmt;

Install luaSQL on Ubuntu

由 可紊 提交于 2021-02-08 08:01:33
问题 TL;DR: You can skip to here. I was trying to use luarocks installer, but the apt-get installer did it without problems. I am experiencing issues when installing luaSQL on Ubuntu. I need it for a script that uses luasql = require "luasql.mysql" . I followed the official documentation which can be found here: http://keplerproject.github.io/luasql/doc/us/ What I've tried (and what was suggested by the official documentation): sudo luarocks install luasql-mysql gave me the following output: Error

How can I sum and then remove duplicate fields MySql?

由 限于喜欢 提交于 2021-02-08 07:56:11
问题 Sorry if this turns out to be duplicate but I am having a hard time finding the exact answer... I have table that contains 'email'(varchar) and 'clicks'(int). The email field contains duplicate instances of email values. I would like to remove the duplicates and keep just one instance but also sum all values found in 'clicks' for that given email instance and update the remaining record to reflect that. I can use distinct and group by to get a view of the records I am after, its the sum and

面试：如何从大量的 URL 中找出相同的 URL？

由 ♀尐吖头ヾ 提交于 2021-02-08 07:54:52
来源 | http://8rr.co/FR7V 题目描述 给定 a、b 两个文件，各存放 50 亿个 URL，每个 URL 各占 64B，内存限制是 4G。请找出 a、b 两个文件共同的 URL。 解答思路 每个 URL 占 64B，那么 50 亿个 URL占用的空间大小约为 320GB。 5, 000, 000, 000 * 64B ≈ 5GB * 64 = 320GB 由于内存大小只有 4G，因此，我们不可能一次性把所有 URL 加载到内存中处理。对于这种类型的题目，一般采用 分治策略 ，即：把一个文件中的 URL 按照某个特征划分为多个小文件，使得每个小文件大小不超过 4G，这样就可以把这个小文件读到内存中进行处理了。 思路如下 ： 首先遍历文件 a，对遍历到的 URL 求 hash(URL) % 1000 ，根据计算结果把遍历到的 URL 存储到 a0, a1, a2, ..., a999，这样每个大小约为 300MB。使用同样的方法遍历文件 b，把文件 b 中的 URL 分别存储到文件 b0, b1, b2, ..., b999 中。这样处理过后，所有可能相同的 URL 都在对应的小文件中，即 a0 对应 b0, ..., a999 对应 b999，不对应的小文件不可能有相同的 URL。那么接下来，我们只需要求出这 1000 对小文件中相同的 URL 就好了。 接着遍历

Can't change user password on MySQL using UPDATE

由 谁说胖子不能爱 提交于 2021-02-08 07:54:47
问题 Under MySql 5.7.17 the mentioned instruction do not work and always I get no feedback or the following error message: ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UPDATE mysql.user SET password=password("elephant7") where user="root"' at line ... I tried the following UPDATE on the command line: UPDATE mysql.user SET Password = PASSWORD('elephant7') WHERE User='root'; I really don't

Can't change user password on MySQL using UPDATE

由 依然范特西╮ 提交于 2021-02-08 07:54:39
问题 Under MySql 5.7.17 the mentioned instruction do not work and always I get no feedback or the following error message: ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'UPDATE mysql.user SET password=password("elephant7") where user="root"' at line ... I tried the following UPDATE on the command line: UPDATE mysql.user SET Password = PASSWORD('elephant7') WHERE User='root'; I really don't

convert GMT time to EST

由 主宰稳场 提交于 2021-02-08 07:54:39
问题 My sql server is located in GMT and I need to get the EST equivalent tz. Somehow the EST is wrong. select now(),convert_tz(now(),'GMT','EST'),convert_tz(now(),'GMT','EST') - interval 10 minute The EST time should be 20:30 and not 19:30 Here is my results - 回答1: As @ceejayoz mentioned, the timezones of locations change depending on daylight savings observation. In addition, it's more proper to call it UTC rather than GMT, as when you call it GMT, it connotes that your servers are tune to some

convert GMT time to EST

由 限于喜欢 提交于 2021-02-08 07:53:06
问题 My sql server is located in GMT and I need to get the EST equivalent tz. Somehow the EST is wrong. select now(),convert_tz(now(),'GMT','EST'),convert_tz(now(),'GMT','EST') - interval 10 minute The EST time should be 20:30 and not 19:30 Here is my results - 回答1: As @ceejayoz mentioned, the timezones of locations change depending on daylight savings observation. In addition, it's more proper to call it UTC rather than GMT, as when you call it GMT, it connotes that your servers are tune to some

Set a repeating value to 0 while leaving the first value alone

由 点点圈 提交于 2021-02-08 07:48:41
问题 I am currently writing a report and noticed that I am getting repeated values. The issue is not that the values are repeating but that I am getting values that should be 0 after the first initial value. For example: My report is displaying the estimated shipping cost which might be $700 and since the order was broken up into 3 shipments, the report prints $700 3 times. This is not true because the estimated shipping should only be calculated one time. I am using iReport My question is: How do
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