How create a SQL array from a Java List?

Question

I'm trying to insert an array in a table, but I need to convert the list to the SQL Array type. I'm using the Connection#createArrayOf() method, but I'm getting an exception.

I need to pass a type name, but I don't know what is this and I always get an exception. The array is from VARCHAR.

How I solve this to insert the array?

The code

Object[] array = new Object[token.getCategories().size()];
array = token.getCategories().toArray();
pstmTokenInsert.setArray(1, conn.createArrayOf("VARCHAR", array));

The stacktrace

org.postgresql.util.PSQLException: Could not find array type for data type VARCHAR
at org.postgresql.jdbc4.AbstractJdbc4Connection.createArrayOf(AbstractJdbc4Connection.java:73)
at org.postgresql.jdbc4.Jdbc4Connection.createArrayOf(Jdbc4Connection.java:21)
at org.apache.commons.dbcp.DelegatingConnection.createArrayOf(DelegatingConnection.java:560)
at br.ifsp.da.data.TokenDAO.insertTokens(TokenDAO.java:37)
at br.ifsp.da.data.ProcessedPageInserter.loopInsertion(ProcessedPageInserter.java:44)
at br.ifsp.da.data.ProcessedPageInserter.call(ProcessedPageInserter.java:27)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722)

Answer 1

Use "varchar" instead of "VARCHAR". See http://grepcode.com/file/repo1.maven.org/maven2/postgresql/postgresql/9.0-801.jdbc4/org/postgresql/jdbc2/TypeInfoCache.java#TypeInfoCache.0types