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Mysql can parse the foreign key syntax for the myisam table type (meaning no error message will be raised if it encounters an fk definition), making migration from other database products or table engines easier because you do not have to edit the create table statements to remove them.
However, the older MyISAM storage engine does not include support for foreign keys. This means that MyISAM tables that are reverse engineered will not automatically have the relationship lines drawn between tables, making the database harder to understand.
4 lut 2017 · It's a little bit of work, but you can do this using triggers, see e.g. here or here. Although you might want to consider changing your hosting site, because there is other stuff that you cannot do in MyISAM (probably most importantly transactions), and, in case that site doesn't support innodb not by choice but because it is too old, because a ...
MyISAM storage engine does not support transactions, foreign keys, and row locking. Also, the storage limit of a MyISAM table is 256TB. MyISAM storage engine does support full-text search indexes, geospatial data type, and indexing.
You are advised to use foreign keys that reference only UNIQUE (including PRIMARY) and NOT NULL keys. For storage engines that do not support foreign keys (such as MyISAM), MySQL Server parses and ignores foreign key specifications.
MySQL FOREIGN KEY Constraint. The FOREIGN KEY constraint is used to prevent actions that would destroy links between tables. A FOREIGN KEY is a field (or collection of fields) in one table, that refers to the PRIMARY KEY in another table.
28 lis 2019 · I need to migrate a lot of mysql MyISAM table to a new InnoDb version, adding foreign key constraints. I can dump and import, disabling first foreign key checks. But is there a way to check which
