Attached is a patch that fixes ResultSetMetaData.isNullable() in

the JDBC driver.

This method is currently unimplemented and always returns
ResultSetMetaData.columnNullable. This is obviously incorrect
when a column is defined with NOT NULL or PRIMARY KEY. And we
have to think of check constraints, views, functions etc.

The patch simply changes the return value to
ResultSetMetaData.columnNullableUnknown. This is until someone
comes up with a real implementation of course.

On Fri, 14 Sep 2001 17:53:50 +0200, Tomisaw Kity?ski wrote:
>Hello there,
>
>could someone tell me, please, do I have any chance to get
>proper implementation of above method in JDBC (1.1+) soon?
>
>Current "return 1" works fine on most tables, however it seems
>to be a little bit incorrect with some of them ;)

Ren? Pijlman

Author: bmomjian

src/interfaces/jdbc/org/postgresql/jdbc1/ResultSetMetaData.java

@@ -136,19 +136,22 @@ public boolean isCurrency(int column) throws SQLException
   }
 
   /**
-   * Can you put a NULL in this column?  I think this is always
-   * true in 6.1's case.  It would only be false if the field had
-   * been defined NOT NULL (system catalogs could be queried?)
+   * Indicates the nullability of values in the designated column.
    *
    * @param column the first column is 1, the second is 2...
    * @return one of the columnNullable values
    * @exception SQLException if a database access error occurs
    */
   public int isNullable(int column) throws SQLException
   {
-    return columnNullable;	// We can always put NULL in
+	/*
+	 * TODO This needs a real implementation, taking into account columns
+	 * defined with NOT NULL or PRIMARY KEY, CHECK constraints, views, 
+	 * functions etc.
+	 */
+    return columnNullableUnknown;
   }
-  
+
   /**
    * Is the column a signed number? In PostgreSQL, all numbers
    * are signed, so this is trivial.  However, strings are not

src/interfaces/jdbc/org/postgresql/jdbc2/ResultSetMetaData.java

@@ -131,17 +131,20 @@ public boolean isCurrency(int column) throws SQLException
   }
 
   /**
-   * Can you put a NULL in this column?  I think this is always
-   * true in 6.1's case.  It would only be false if the field had
-   * been defined NOT NULL (system catalogs could be queried?)
+   * Indicates the nullability of values in the designated column.
    *
    * @param column the first column is 1, the second is 2...
    * @return one of the columnNullable values
    * @exception SQLException if a database access error occurs
    */
   public int isNullable(int column) throws SQLException
   {
-    return columnNullable;	// We can always put NULL in
+	/*
+	 * TODO This needs a real implementation, taking into account columns
+	 * defined with NOT NULL or PRIMARY KEY, CHECK constraints, views, 
+	 * functions etc.
+	 */
+    return columnNullableUnknown;
   }
 
   /**