mysql

Mysql Query issues using LIKE and apostrophe

由 懵懂的女人 提交于 2021-02-19 01:32:07
问题 So I have an interesting issue that I have never come across and can't seem to find much information about correcting the issue. I have massive database that has an enormous amount of data in it (10 years worth), and attempting to search through it. Now the search stuff works fine, but recently someone brought it to my attention about a 'bug' if you will. I've tried to trouble shoot it to get the expected results, but to no avail. This is my issue: When someone uses an apostrophe in the

Python + MySQLdb executemany

由 别来无恙 提交于 2021-02-19 01:26:44
问题 I'm using Python and its MySQLdb module to import some measurement data into a Mysql database. The amount of data that we have is quite high (currently about ~250 MB of csv files and plenty of more to come). Currently I use cursor.execute(...) to import some metadata. This isn't problematic as there are only a few entries for these. The problem is that when I try to use cursor.executemany() to import larger quantities of the actual measurement data, MySQLdb raises a TypeError: not all

How to remove a number from MySQL's JSON array?

由 邮差的信 提交于 2021-02-19 00:49:46
问题 If I have a MySQL table with a JSON column called numbers and a record that has [1, 2, 3] in that column (array of integers), how do I update that record to remove the 2 (so it becomes [1, 3] )? 回答1: I was searching for an answer my self and came to this question, not wanting to use objects I continued the search. But I found a solution, you need to use a combination of json_remove and json_search The following removes the value 1 from the table tbl and the column numbers UPDATE tbl SET

How to remove a number from MySQL's JSON array?

由 自闭症网瘾萝莉.ら 提交于 2021-02-19 00:47:22
问题 If I have a MySQL table with a JSON column called numbers and a record that has [1, 2, 3] in that column (array of integers), how do I update that record to remove the 2 (so it becomes [1, 3] )? 回答1: I was searching for an answer my self and came to this question, not wanting to use objects I continued the search. But I found a solution, you need to use a combination of json_remove and json_search The following removes the value 1 from the table tbl and the column numbers UPDATE tbl SET

Most efficient way to clone an AWS RDS database?

由 浪尽此生 提交于 2021-02-18 22:46:54
问题 I have 2 MySQL databases running on a server called X and Y, which both have identical content. A series of updates run throughout the day, which changes the content of X. At the end of the day, a process runs that compares the content of X with the content of Y (for various tables) in order to discover new rows, updated row data etc. Once the updates have been processed, mysqldump is used to dump X and then Y is overwritten with the dump. Both X and Y are now the same again, and the whole

Most efficient way to clone an AWS RDS database?

由 喜你入骨 提交于 2021-02-18 22:44:34
问题 I have 2 MySQL databases running on a server called X and Y, which both have identical content. A series of updates run throughout the day, which changes the content of X. At the end of the day, a process runs that compares the content of X with the content of Y (for various tables) in order to discover new rows, updated row data etc. Once the updates have been processed, mysqldump is used to dump X and then Y is overwritten with the dump. Both X and Y are now the same again, and the whole

What can I do to get actual prepared statements in Wordpress

由 我与影子孤独终老i 提交于 2021-02-18 22:24:06
问题 My company wants to use WordPress for their Internet site and my main concern is the use of prepared statements. According to this, and I read the source code myself in disbelief, WordPress sanitizes string but is not prepared at the database. Is there anything I can do to get the real thing? Or are my concerns unfounded? 回答1: History Understand that the wpdb class, originally a fork of Justin Vincent's ezSQL library, was introduced way back in 2003, only a couple of months after the MySQL

mysql 彻底解决：Incorrect string value: '\xF0\x9F\x98\xAD",...' for column 'commentC...

由 家住魔仙堡 提交于 2021-02-18 21:31:31
彻底解决：Incorrect string value: '\xF0\x9F\x98\xAD",...' for column 'commentContent' at row 1 今天在爬取网易云音乐歌曲评论的时候，在将数据插入mysql数据库的时候，出现了 Incorrect string value: '\xF0\x9F\x98\xAD",...' for column 'commentContent' at row 1 这个错误，Google了下发现原来是因为数据库编码问题导致的，原因在于我们的评论数据中存在emoj表情，而这些表情是按照四个字节一个单位进行编码的，而我们通常使用的utf-8编码在mysql数据库中默认是按照3个字节一个单位进行编码的，正是这个原因导致将数据存入mysql数据库的时候出现错误，那么这个问题我们应该怎么解决呢？ 　　我分为下面五个步骤来解决： (1)：修改mysql数据库的编码为uft8mb4 (2)：修改数据表的编码为utf8mb4 (3)： 　　　　在mysql的安装目录下找到my.ini,作如下修改： 　　　　[mysqld] 　　　　character-set-server=utf8mb4 　　　　[mysql] 　　　　default-character-set=utf8mb4 　　　　修改后重启Mysql 　　　　 （4）

SpringBoot整合Zookeeper和Dubbo

由 北慕城南 提交于 2021-02-18 21:31:18
一、Dubbo 1、 Dubbo定义 Dubbo是Alibaba开源的分布式服务框架，它最大的特点是按照分层的方 式来架构，使用这种方式可以使各个层之间解耦合（或者最大限度地松耦 合）。从服务模型的角度来看，Dubbo采用的是一种非常简单的模型，要 么是提供方提供服务，要么是消费方消费服务，所以基于这一点可以抽象 出服务提供方（Provider）和服务消费方（Consumer）两个角色。 Dubbo就是资源调度和治理中心的管理工具。 2、Dubbo架构 节点角色说明： Provider: 暴露服务的服务提供方。 Consumer: 调用远程服务的服务消费方。 Registry: 服务注册与发现的注册中心。 Monitor: 统计服务的调用次调和调用时间的监控中心。 Container: 服务运行容器。 调用关系说明： 0. 服务容器负责启动，加载，运行服务提供者。 1. 服务提供者在启动时，向注册中心注册自己提供的服务。 2. 服务消费者在启动时，向注册中心订阅自己所需的服务。 3. 注册中心返回服务提供者地址列表给消费者，如果有变更，注册中心将基于长连接推送变更数据给消费者。 4. 服务消费者，从提供者地址列表中，基于软负载均衡算法，选一台提供者进行调用，如果调用失败，再选另一台调用。 5. 服务消费者和提供者，在内存中累计调用次数和调用时间，定时每分钟发送一次统计数据到监控中心

mysql insert after delete fails because of “duplicate entry”

由 懵懂的女人 提交于 2021-02-18 20:56:19
问题 I have a code with two mysql queries. DELETE FROM my_table WHERE user_id=some_number INSERT INTO my_table (user_id, ... ) VALUES(some_number, ...) The field user_id is unique. In rare cases the insert fails claiming a duplicate entry occurred. My first instinct leads me to to believe the DELETE didn't finish and now the insert is trying to insert and I'm getting a duplicate entry. Is this possible? How can I avoid this? Might there be a different explanation you can think of? Update: The
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