Difference between revisions of "MySQL"
From Useful Things
(→After update) |
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= Triggers = | = Triggers = | ||
| − | == | + | == Before == |
| + | * OLD table name does not exist here | ||
<syntaxhighlight lang="mysql"> | <syntaxhighlight lang="mysql"> | ||
| − | create trigger {trigger_name} after update on {table_name} | + | create trigger {trigger_name} before [update|insert|delete] on {table_name} |
| + | for each row begin | ||
| + | insert into {new_table} (col1, col2, col3) values (OLD.col1, OLD.col2, OLD.col3) | ||
| + | end | ||
| + | </syntaxhighlight> | ||
| + | |||
| + | == After == | ||
| + | * OLD and NEW table names can be used to access the old value and the new value respectively | ||
| + | <syntaxhighlight lang="mysql"> | ||
| + | create trigger {trigger_name} after [update|insert|delete] on {table_name} | ||
for each row begin | for each row begin | ||
insert into {new_table} (col1, col2, col3) values (OLD.col1, NEW.col2, OLD.col3) | insert into {new_table} (col1, col2, col3) values (OLD.col1, NEW.col2, OLD.col3) | ||
end | end | ||
</syntaxhighlight> | </syntaxhighlight> | ||
Revision as of 12:30, 26 June 2014
Contents
User management
Adding a user
grant all privileges on {database_name}.* to {database_user}@'%' identified by 'their_password';Revoking privileges
revoke usage on {databse_name}.* from {database_user}@'%';Removing a user
drop user {database_user}@'%';Triggers
Before
- OLD table name does not exist here
create trigger {trigger_name} before [update|insert|delete] on {table_name}
for each row begin
insert into {new_table} (col1, col2, col3) values (OLD.col1, OLD.col2, OLD.col3)
endAfter
- OLD and NEW table names can be used to access the old value and the new value respectively
create trigger {trigger_name} after [update|insert|delete] on {table_name}
for each row begin
insert into {new_table} (col1, col2, col3) values (OLD.col1, NEW.col2, OLD.col3)
end