Wordpress 4 makes use of SHOW COLUMNS and SHOW TABLES in addition to
SHOW INDEX, both with and without the FULL modifier. Implement support
for these statements using queries against INFORMATION_SCHEMA.
Some of these queries use lower-case versions of these statements,
such as "show tables like 'wp_flag_pictures'", so we make sure to
recognize both the upper- and lower-case versions.
This is based, in part, on the work of raptorz in the support forum at
https://wordpress.org/support/topic/upgrade-to-wp421-fail?replies=3#post-6886123
Signed-off-by: Kevin Locke <kevin@kevinlocke.name>
The current rewriting changes "default '0000-00-00 00:00:00'" when it
appears in CREATE TABLE statements, but does not handle the case that a
column default value is modified. This results in errors such as the
following during schema upgrade:
Error running :
ALTER TABLE wp_users ALTER COLUMN user_registered SET DEFAULT '0000-00-00 00:00:00'
---- converted to ----
ALTER TABLE wp_users ALTER COLUMN user_registered SET DEFAULT '0000-00-00 00:00:00'
----> ERROR: date/time field value out of range: "0000-00-00 00:00:00"
Apply the conversion to ALTER TABLE statements as well.
Signed-off-by: Kevin Locke <kevin@kevinlocke.name>
