* Database schema update to reflect 1.18 and 1.19 changes.
* Better support for numRows() and dataSeek() functions on DB2 result sets.
* Updates to DB2 installer and updater classes.
* Developed by Andre, Diego, and other students at Minho University and reviewed by me.
* See r85885, r85896.
Only seemingly supported by MySQL, and likely a seldom used function
Not worth trying to support it, as other non mysql db's would need workarounds, and that's just not happening
* Merged the 4 simulated implementations of Database*::replace(). I took diffs, they were nearly identical. I made one based on the IBM DB2 version, since it used insert() which looked like a nice touch.
* Provided the non-simulated implementation of Database*::replace() via a protected member function, and made DatabaseMysql::replace() and DatabaseSqlite::replace() into a wrapper for it.
* Moved the MySQL-specific functionality from masterPosWait(), getSlavePos() and getMasterPos() from DatabaseBase to DatabaseMysql.
* Renamed getStatus() to getMysqlStatus() and moved it to DatabaseMysql. Removed "unimplemented" errors from two other subclasses. Really there's no way another DBMS could or should implement this function.
* Split the LoadMonitor class into a no-op class and a MySQL-specific class, to avoid fatal errors due to the getMysqlStatus() call if other DBMSs tried to use LoadBalancer with multiple servers. Of course there are lots of other reasons it won't work, I'm just fixing the architecture issue here.
And while I have a replicated test setup handy:
* On MySQL 4.1.9 and later, use SHOW SLAVE STATUS to get the lag instead of SHOW PROCESSLIST. This has the advantage of reading zero when there are no events for a while.
* Reverted the public -> protected changes from r90429, except for doQuery() after a review of usage:
** resultObject() is used by lots of things in core and extensions.
** makeSelectOptions() is used by SMW, and if that's going to be public, the other two probably should be too, for consistency.
** doQuery() was used by several things, but mostly by mistake. It's been marked private since r21359 which is before almost all of them. I updated the callers to use query().
* Added "protected" to doQuery() declarations in other database classes.
* Made them all implement one common interface (might add more functions to it later)
* Moved MySQLField to DatabaseMysql.php
* Renamed nullable() to isNullable()
* Removed maxLength() from:
** SQLiteField: makes no sense
** MySQLField: doesn't do what people may think, useless for this class' purpose of assisting querying the DB schema
Removed $wgDBcataloged based on discussion with platonides for r45755. All DB2 connections are now uncataloged. There is no performance difference.
Now using DB2 persistent connections.
Removed uniqueness constraint on user_groups table index in DB2 schema.
DB2: New LIST_SET_PREPARED mode for DatabaseIbm_db2::makeList() that handles ? tokens in prepared UPDATE statement
DB2: General fixes for DB2 database schema
DB2: Factored out foreign key definitions into foreignkeys.sql so that more can be added down the line without messing with the main schema
DB2: Better limit and offset support
