I have an array with Field Names and jdbc Type codes. (Those int codes that you can find in
http://download.oracle.com/javase/1.4.2/docs/api/constant-values.html#java.s
The Apache DdlUtils Library has a convenience class for this: https://db.apache.org/ddlutils/api/org/apache/ddlutils/model/TypeMap.html
String typeName = TypeMap.getJdbcTypeName(typeCode)
The library helps you also with other DDL needs, but doesn't seem to get much attention lately.