* 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.
It is now duplicateTableStructure() duty to addIdentifierQuotes() them.
Fixed bug for mysql < 4.1 where the new name would be quoted twice.
Always quote identifier in Oracle, doing otherwise seems a bug (can someone confirm?)
This fixes bug in DatabaseOracle.php tableName() on line 671 and allows it to call
the parent implementation instead of copying it with different quotes.
Adapt Mssql addIdentifierQuotes(). Replace its addIdentifierQuotes calls with addQuotes
as it's what it really is. The serialize() is probably unneeded, since I don't think it will
ever be called with objects but I kept it anyway.
-Add a working PHPUnit test that instantiates a new DB, adds set data, and deleted when done.
-Add listTables() to the Database classes (only MySql and SQLite use it, and only MySQL is tested)
* Drop unused and likely broken /*$var*/` -> `$var syntax
* Replace {$var} with '{$var}' and `{$var}` handling that uses relevant database independent quoting ({$var} without surrouding quotes are never used)
* Give the generic/mysql class a proper quote_ident implementation
* Fix the unused Oracle and Sqlite quote_ident implementations which are potential sql injections if used
* Split common variable replacemnt code off to a replaceGlobalVars and make the generic and oracle code use it instead of duplicating the same code as each other
* 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
