Java - Prepared statements and arrays

Question

How can I handle an array in a prepared statement? ie, I want to do a query and one of the parameters I get is an array of strings which I want to use in the query (Don't select rows that have a field that's in the array)?

Answer 1

这可能现在对您无济于事，但我读到JDBC 4将支持SQL 2003版本中定义的数组类型。

Answer 2

Some JDBC drivers may already (before JDBC 4) contain proprietary extensions that support array-type parameters in prepared statements - you would need to consult with API for this. This would mean that you have to use and manipulate array-like type in SQL.

One work around would be using temporary tables. These are meta-steps for such solution:

1. Begin transaction (this is automatic if you are inside transactional method - EJB or Spring);
2. Using JDBC batch insert with prepared statement create and populate a temporary table with arrary elements (temporary table must have transactional scope - this is also proprietary to databases but supported by Oracle at least);
3. Construct your desired SQL that includes a join to temporary table to use array values (it could be explicit inner or outer JOIN or implicit join, eg using EXISTS, etc.);
4. Commit (or rollback if application exception) transaction (this should destroy temporary table; concurrent transactions should have no conflict for the same name of temporary table).

Example: IN expression gets replaced with JOIN to temporary table.

Answer 3

That pretty much depends upon RDBMS being used. Often such functionality can be accomplished using vendor's jdbc driver extensions.

2 variants I found are (for Oracle): http://blogs.itemis.de/kloss/2009/03/05/arrays-preparedstatements-jdbc-and-oracle/

http://www.angelfire.com/home/jasonvogel/java_jdbc_arrays.html

Try to look if that would help you.