In Django, getting a “Error: Unable to serialize database” when trying to dump data?
Could be something similar to this. Run it with: python manage.py dumpdata –indent=2 -v 2 –traceback gigs To see the underlying error.
Could be something similar to this. Run it with: python manage.py dumpdata –indent=2 -v 2 –traceback gigs To see the underlying error.
You get it via SELECT LAST_INSERT_ID(); or via having your framework/MySQL library (in whatever language) call mysql_insert_id(). That won’t work. There you have to query the IDs after inserting.
This is a MySQL answer. They perform exactly the same – unless you are using MyISAM, then a special case for COUNT(*) exists. I always use COUNT(*) anyway. https://dev.mysql.com/doc/refman/5.6/en/aggregate-functions.html#function_count For MyISAM tables, COUNT(*) is optimized to return very quickly if the SELECT retrieves from one table, no other columns are retrieved, and there is no …
Ver refers to the version of the mysql command line client – what you are envoking by typing ‘mysql’ Distrib refers to the mysql server version your client was built with. This is not to be confused with the mysql server you are connected to, which can be obtained with SELECT VERSION(); The mysql client …
GROUP BY maps groups of rows to one row, per distinct value in specific columns, which don’t even necessarily have to be in the select-list. SELECT b, c, d FROM table1 GROUP BY a; This query is legal SQL (correction: only in MySQL; actually it’s not standard SQL and not supported by other brands). MySQL …
Yes you can. You just need to make that column be an index. CREATE TABLE `test` ( `testID` int(11) NOT NULL, `string` varchar(45) DEFAULT NULL, `testInc` int(11) NOT NULL AUTO_INCREMENT, PRIMARY KEY (`testID`), KEY `testInc` (`testInc`) ) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8; insert into test( testID, string ) values ( 1, ‘Hello’ ); insert into test( …
There are a number of changes with express 4.x. Like the error says, all of the middleware has been removed. Update your package.json to include the “new” packages, a basic list can be found here and a full list here Using your code from above, you would just need the following: // package.json { “dependencies”: …
From the MySQL 5.0 Reference: Assessment of the nature of a routine is based on the “honesty” of the creator: MySQL does not check that a routine declared DETERMINISTIC is free of statements that produce nondeterministic results. However, misdeclaring a routine might affect results or affect performance. Declaring a nondeterministic routine as DETERMINISTIC might lead …
I found myself asking this question and from all the posts I read never found any performance comparisons. So here’s my attempt. I’ve created the following tables, populated with 2,000,000 random ip address from 100 random networks. CREATE TABLE ipv6_address_binary ( id SERIAL NOT NULL AUTO_INCREMENT PRIMARY KEY, addr BINARY(16) NOT NULL UNIQUE ); CREATE …
This is a phpmyadmin internal mechanism to manage relationship between tables. This feature is actually useful for MYISAM tables which don’t support foreign keys and constraints. By defining internal relations in phpmyadmin you link tables together which otherwise can’t be linked. These information are stored in a phpmyadmin specific table inside your MySQL server (phpmyadmin.PMA_relation). …