Derby where is null

The table later in this topic lists all the core Derby properties. Note: When setting properties that have boolean values, be sure to trim extra spaces around the word true. Extra spaces around the word true cause the property to be set to false, regardless of its previous setting. Table 1. Derby properties Property Scope Dynamic or Static derby. UserName S, D Dynamic. UserName Parent topic: Derby property reference.

This works in both DB2 and Derby and should work in pretty much any other database engine, as well. The reason that you have to cast when issuing an insert into If you don't want to do anything in the null case, then you can use the unit value :.

Of course, you could also do the null check just like in C , which is probably clearer in this case:. You can find the codes in the DB2 Information Center. Android will also require a permission to read certain files. Maybe you need to add this to your manifest:. Derby's handling of NULL values. Asked 4 Months ago Answers: 5 Viewed 22 times. SYSDUMMY1 But very often, in Java, the type that null should be cast to is unknown: In this example, the types could be derived from the insert clause, but that might prove to be complicated or impossible for more general use-cases.

What you would have to do if you wrote the SQL yourself is to cast null to int or something like that. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Ask Question. Asked 11 years, 7 months ago. Active 10 years, 9 months ago. Viewed 5k times. Does anyone know why the following query fails in Derby? The prepared statement is as follows: delete from MyTable where?

Thanks for the answers. I should have added the sql is being generated in a java program by an iBatis orm layer. The prepared statement is as follows delete from MyTable where?

I've edited the original question to clarify this hopefully. Add a comment. Active Oldest Votes. Nothing weird.