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Date: Thu, 3 Nov 2005 19:04:47 +0100 (CET)
From: "Deepa Remesh (JIRA)" <derby-dev@db.apache.org>
To: derby-dev@db.apache.org
Subject: [jira] Created: (DERBY-680) In ij,
 executing a prepared statement with numeric/decimal parameter fails with
 NullPointerException in J2ME/CDC/FP
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In ij, executing a prepared statement with numeric/decimal parameter fails with NullPointerException in J2ME/CDC/FP
-------------------------------------------------------------------------------------------------------------------

         Key: DERBY-680
         URL: http://issues.apache.org/jira/browse/DERBY-680
     Project: Derby
        Type: Bug
  Components: Tools  
    Versions: 10.2.0.0    
 Environment: j9_foundation VM in IBM WCTME 5.7
    Reporter: Deepa Remesh
 Assigned to: Deepa Remesh 


NPE is thrown in ij when executing prepared statement which 
- has numeric/decimal parameters
- does not return any result set

Repro for this problem is the test lang/cast.sql. This test currently fails in CDC/FP.

The following lines in the test throw NPE:
execute q10 using 'values 123456.78';
execute q11 using 'values 123456.78';

where q10 is "prepare q10 as 'insert into t1 (num) values cast(? as numeric(18))';"
and q11 is "prepare q11 as 'insert into t1 (dc) values cast(? as decimal(18))';"

The stack trace for failure is:
java.lang.NullPointerException
        at org.apache.derby.impl.tools.ij.util.DisplayMulti(util.java:666)
        at org.apache.derby.impl.tools.ij.utilMain.displayResult(utilMain.java:398)
        at org.apache.derby.impl.tools.ij.utilMain.go(utilMain.java:290)
        at org.apache.derby.impl.tools.ij.Main.go(Main.java:203)
        at org.apache.derby.impl.tools.ij.Main.mainCore(Main.java:169)
        at org.apache.derby.impl.tools.ij.Main.main(Main.java:75)
        at org.apache.derby.tools.ij.main(ij.java:56)


This happens in the following code. Since the above prepared statements do not return result sets, call to getMetaData() will return null. But in the code, no check is done to see if getMetaData() returns null before calling getColumnType.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
						// In J2ME there is no object that represents
						// a DECIMAL value. By default use String to
						// pass values around, but for integral types
						// first convert to a integral type from the DECIMAL
						// because strings like 3.4 are not convertible to
						// an integral type.
						switch (ps.getMetaData().getColumnType(c))
						{
						case Types.BIGINT:
							ps.setLong(c, rs.getLong(c));
						    break;
						case Types.INTEGER:
						case Types.SMALLINT:
						case Types.TINYINT:
							ps.setInt(c, rs.getInt(c));
							break;
						default:
							ps.setString(c,rs.getString(c));
						    break;
						}			
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


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