Fixes a thread safety problem introduced by DBUTILS-124.

[hdevalke]

ColumnHandlers and PropertyHandlers are preloaded in a list as the ServiceLoader instances are not thread safe

[thecarlhall]

Thanks, @hdevalke! Nice catch. I totally missed that ServiceLoader isn't thread safe. I'll work to get this merged into master and cut a new release as soon as I can.

[garydgregory]

What not use a single static block?

[hdevalke]

Can you explain why that is problematic?

[garydgregory]

I think of it the other way around: Why use two blocks when you could use one?

[hdevalke]

I didn't see there was already a static block initializing primitiveDefaults. I find it more readable initializing each static variable in their own block. I did an update and put all in one static block.

[garydgregory]

I created https://issues.apache.org/jira/browse/DBUTILS-135 to track this fix. Committed to git master.

[objectboy2016]

Why not design a named parameter

such as:
string sql="select * from user where name=:name";
.......
runquery.addParameter("name","paul");

So simple and straightforward
No problem with the number, but the parameters of many will be a disaster

such as:
insert into a (a, b, c, d, f, g, i, e, g, k) values (?,?,?,?,?,?,?,?,?)

My eyes have been spent.

eager!!!!!!!!!!!!!!!!!!!!!!!