[jira] Commented: (DERBY-129) Derby should throw a truncation error or warning when CASTing a parameter/constant to char or char for bit datatypes and the data is too large for the datatype.

["Knut Anders Hatlen (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DERBY-129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12867896#action_12867896 ] 

Knut Anders Hatlen commented on DERBY-129:
------------------------------------------

I don't think Jeremy suggested that this issue was invalid, only that the appropriate response is a warning and not an exception. Derby doesn't currently give a warning.

> Derby should throw a truncation error or warning when CASTing a parameter/constant to char or char for bit datatypes and the data is too large for the datatype.
> ----------------------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: DERBY-129
>                 URL: https://issues.apache.org/jira/browse/DERBY-129
>             Project: Derby
>          Issue Type: Bug
>          Components: JDBC
>    Affects Versions: 10.0.2.1
>            Reporter: Mamta A. Satoor
>
> Derby doesn't throw a truncation exception/warning when data is too large during casting of constants or parameters to character string or bit string data types. 
> Following is ij example for constants which is too big for the datatype it is getting cast to
> ij> values (cast ('hello' as char(3)));
> 1
> ----
> hel
> 1 row selected
> ij> values (cast (X'0102' as char(1) for bit data));
> 1
> ----
> 01
> 1 row selected
> Following code snippet is when using parameters through a JDBC program
>    s.executeUpdate("create table ct (c CLOB(100K))");
>    //the following Formatters just loads cData with 32700 'c' characters
>    String cData = org.apache.derbyTesting.functionTests.util.Formatters.repeatChar("c",32700);
>    //notice that ? in the preared statement below is bound to length 32672
>    pSt = con.prepareStatement("insert into ct values (cast (? as varchar(32672)))");
>    pSt.setString(1, cData);
>    //Derby doesn't throw an exception at ps.execute time for 32700 characters into 32672 parameter. It silently
>    truncates it to 32672
>    pSt.execute();

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