Attached is a patch which deals with

select 'id' as xxx from table

The issue is:

When the driver gets a data type which does not map into the SQL.Types
it attempts to load the object into a java object. Eventually throwing
an exception indicating that the type "unknown" was not found.

Since the backend defaults "unknown" types to text it was suggested that
the jdbc driver do the same.

This patch does just that.

I have tested it on the above select statement as well as a small
program that serializes, and deserializes a class

Dave Cramer

2 files changed, 14 insertions, 2 deletions

diff --git a/src/interfaces/jdbc/org/postgresql/jdbc1/ResultSet.java b/src/interfaces/jdbc/org/postgresql/jdbc1/ResultSet.java
index 8949eabc75b..eecce9c939c 100644
--- a/src/interfaces/jdbc/org/postgresql/jdbc1/ResultSet.java
+++ b/src/interfaces/jdbc/org/postgresql/jdbc1/ResultSet.java
@@ -862,7 +862,13 @@ public class ResultSet extends org.postgresql.ResultSet implements java.sql.Resu
       case Types.VARBINARY:
 	return getBytes(columnIndex);   
       default:
-        return connection.getObject(field.getPGType(), getString(columnIndex));
+        String type = field.getPGType();
+        // if the backend doesn't know the type then coerce to String
+        if (type.equals("unknown")){
+           return getString(columnIndex);
+        }else{
+           return connection.getObject(field.getPGType(), getString(columnIndex));
+        }
       }
   }
   
diff --git a/src/interfaces/jdbc/org/postgresql/jdbc2/ResultSet.java b/src/interfaces/jdbc/org/postgresql/jdbc2/ResultSet.java
index 9df669910da..feec8d08c26 100644
--- a/src/interfaces/jdbc/org/postgresql/jdbc2/ResultSet.java
+++ b/src/interfaces/jdbc/org/postgresql/jdbc2/ResultSet.java
@@ -727,7 +727,13 @@ public class ResultSet extends org.postgresql.ResultSet implements java.sql.Resu
       case Types.VARBINARY:
 	return getBytes(columnIndex);   
       default:
-        return connection.getObject(field.getPGType(), getString(columnIndex));
+        String type = field.getPGType();
+        // if the backend doesn't know the type then coerce to String
+        if (type.equals("unknown")){
+           return getString(columnIndex);
+        }else{
+           return connection.getObject(field.getPGType(), getString(columnIndex));
+        }
       }
   }