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I'm building a MySQL database and I think the use of implicit DEFAULTS is very promising.
I use successfully
DEFAULT CURRENT_TIMESTAMP and
DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP for On Insert Timestamps and On Update Timestamps.
I would like to add a public key standard. A 32-character unique and random alphanumeric string. Is this possible with the DEFAULT field specification? If so, how?
Or do I have to deal with it by creating a random value and checking its uniqueness, for the 1 in 1.5 ^ 50 chance, it's a duplicate, at INSERT?
This article seemed promising, but gave me no definitive answers: https://www.percona.com/blog/2015/04/29/generated-virtual-columns-in-mysql-5-7-labs/
thank you in advance
Laravel has 2 fields in his auth that help the user to log in, e.g. Eg email and password. I've added another field (hidden field) to the login blade to pass a random number along with the password and email address.
In my eloquentuserprovider.php I grab $ credentials[‘password’] and $ credentials[‘email’] but so when I write $ credentials[‘hidden’] I get the error message "undifined index hidden".
So my question is how to add other fields together with email and password to validate the user
I am writing my entire validation logic in eloquentuserprovider.php
Reviewed by Jamesreimb on
i 2019 zk
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I am using a Plesk VPS (Operating system: Centos 6 / Linux (Final)), where I recently tried to upgrade MySQL from version 5.5.55 to version 5.6.
Since I'm relatively new to this area, I've followed this Plesk article closely. In particular, I have the steps on the & # 39; Plesk on CentOS 6 & # 39; followed.
Unfortunately, I made the mistake that version 8 is disabled by default. As a result, MySQL Version 8 has been installed, causing major problems now. To the point where I can not start MySQL anymore.
I tried to downgrade from version 8 to version 5.6 by opening the file
/etc/yum.repos.d/mysql-community.repo Notepad ++, where I made sure that the following was entered:
# Enable MySQL 5.5 [mysql55-community] name = MySQL 5.5 Community Server baseurl = http: //repo.mysql.com/yum/mysql-5.5-community/el/6/$basearch/ enabled = 0 gpgcheck = 1 gpgkey = file: /// etc / pki / rpm-gpg / RPM-GPG-KEY-mysql # Enable MySQL 5.6 [mysql56-community] name = MySQL 5.6 Community Server baseurl = http: //repo.mysql.com/yum/mysql-5.6-community/el/6/$basearch/ activated = 1 gpgcheck = 1 gpgkey = file: /// etc / pki / rpm-gpg / RPM-GPG-KEY-mysql # Activate MySQL 5.7 [mysql57-community] name = MySQL 5.7 Community Server baseurl = http: //repo.mysql.com/yum/mysql-5.7-community/el/6/$basearch/ enabled = 0 gpgcheck = 1 gpgkey = file: /// etc / pki / rpm-gpg / RPM-GPG-KEY-mysql [mysql80-community] name = MySQL 8.0 Community Server baseurl = http: //repo.mysql.com/yum/mysql-8.0-community/el/6/$basearch/ enabled = 0 gpgcheck = 1 gpgkey = file: /// etc / pki / rpm-gpg / RPM-GPG-KEY-mysql [mysql-connectors-community] name = MySQL Connectors Community baseurl = http: //repo.mysql.com/yum/mysql-connectors-community/el/6/$basearch/ activated = 1 gpgcheck = 1 gpgkey = file: /// etc / pki / rpm-gpg / RPM-GPG-KEY-mysql [mysql-tools-community] name = MySQL Tools Community baseurl = http: //repo.mysql.com/yum/mysql-tools-community/el/6/$basearch/ activated = 1 gpgcheck = 1 gpgkey = file: /// etc / pki / rpm-gpg / RPM-GPG-KEY-mysql [mysql-tools-preview] name = MySQL Tools preview baseurl = http: //repo.mysql.com/yum/mysql-tools-preview/el/6/$basearch/ enabled = 0 gpgcheck = 1 gpgkey = file: / etc / pki / rpm-gpg / RPM-GPG-KEY-mysql [mysql-cluster-7.5-community] name = MySQL Cluster 7.5 Community baseurl = http: //repo.mysql.com/yum/mysql-cluster-7.5-community/el/6/$basearch/ enabled = 0 gpgcheck = 1 gpgkey = file: /// etc / pki / rpm-gpg / RPM-GPG-KEY-mysql [mysql-cluster-7.6-community] name = MySQL Cluster 7.6 Community baseurl = http: //repo.mysql.com/yum/mysql-cluster-7.6-community/el/6/$basearch/ enabled = 0 gpgcheck = 1 gpgkey = file: /// etc / pki / rpm-gpg / RPM-GPG-KEY-mysql
When entering the command
yum update mysqlThe following was displayed on the screen:
Loaded plugins: fastest mirrors, security Set up the upgrade process Load the mirror speed from the cached host file * atomic: www4.atomicorp.com * epel: mirror.freethought-internet.co.uk * remi-safe: mirror.netweaver.uk Package (s) mysql available but not installed. No packages marked for updating
I then went on with the steps, hoping the installation would still work miraculously.
I have come as far as
Service MySQL start where I made the same mistake as before, that was:
MySQL daemon could not be started. Start mysqld: [FAILED]
Not only am I completely at a loss as to how to downgrade to MySQL version 5.6 and start a backup of MySQL.
[Warning] [Server] & # 39; Disabling symbolic links with --skip-symbolic-left (or equivalent option) is the default. Consider not using this option because it is outdated and will be removed in a future release. [System] [Server] / usr / sbin / mysqld (mysqld 8.0.16) is started as process 14057 [System] [Server] Start the data directory upgrade. [ERROR] [InnoDB] Unsupported redo log format (0). The redo log was created before MySQL 5.7.9 [ERROR] [InnoDB] Plugin initialization aborted with error General error. [ERROR] [Server] Error initializing the DD Storage Engine. [ERROR] [Server] Initialization of the data dictionary failed. [ERROR] [Server] Abort, stop [System] [Server] / usr / sbin / mysqld: shutdown complete (mysqld 8.0.16) MySQL Community Server - GPL.
Reviewed by MervinROX on
i 2019 14
i 2019 14https: //i109.fastpic****big/2019/0530/1a/8cc154f25e5801e1a07b7acf76dc8a1a.jpg i i i ,. 12:24, -, (2001) HD. 2019 2017 (49), 39 "II:" 30.28 Likes. 0 comments. 0. 2019, & # 39 ;, -, 54., 16. 2017140 & # 39; 2017 (15 ,, ISBN: 978-617-7312-45-0, -, & # 39 ;, 25: 60-61 , 69-70. ,, 100 -, 2006, 17.,.,.!. 11: 55 9 ,, ROSHEN.
I've created a Select statement that displays all topics associated with a book. Now I'm trying to create a Select statement that displays all topics that are not associated with the book. Book and topic have a much too much relationship.
Problem: I get the topics associated with other books because they are not technically associated with my book.
In detail: I have a database full of books. A book can have many topics and a topic can have many books. I have created a UI for adding a book. This interface displays all available topics when the user selects three topics. Three records are created in the books_has_topics table. One field has an ID for the book, the other for the topic. I also have a UI for updating the book. I want the user to be able to change the topics.
that works, it gives me a list of all books assigned to the book based on the book id.
SELECT * FROM topic T INNER JOIN book_has_topic BHT ON T.topic_id = BHT.topic_topic_id WHERE BHT.Book_book_id = [bookid];
This kind of work I not only get all the topics that are not associated with the book ID, but also all the topics that are associated with other books.
SELECT DISTINCT topic_id, topic_name FROM topic T LEFT JOIN book_has_topic BHT ON T.topic_id = BHT.topic_topic_id WHERE BHT.book_book_id IS NULL or BHT.book_book_id <> [bookid];
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We have a setup of Master -> Replication -> Replication
the dbs are: mysql 5.7 -> 5.6 -> 5.7
On replication 5.6 we have the following my.cnf:
[mysqld] default-storage-engine = InnoDB innodb_file_per_table = 1 Benefit scheme = 0 max_connections = 4096 group_concat_max_len = 8196 innodb_flush_log_at_trx_commit = 0 query_cache_limit = 128 MB query_cache_size = 128 MB max_allowed_packet = 268435456 open_files_limit = 29000 #log_timestamps = SYSTEM Slow-Query-Log = 1 #log = /var/log/mysql_query.log Server ID = 2 log-bin replicate-do-db = db_main log-slave-updates Slave jump error = all
However, the bin log on the server is not updated. The relay log is being updated. Server ID on the Master 5.7 is 1 and on the last 5.7 Slave is 3.
all servers have log slave updates and after validation with mysqladmin var | grep update we see log_slave_updates ON.
What are we missing?