Re: Exception when setting a CLOB on H2 v2.0.202

Hi Nigel,

Thanks for pointing this out. What you are suggesting sounds like the right solution. And we'd gladly accept a PR at https://github.com/apache/cayenne <https://github.com/apache/cayenne>

Cheers,
Andrus


> On Jan 19, 2022, at 4:38 AM, Nigel Huband <[email protected]> wrote:
> 
> Hi everybody,
>  
> In Cayenne 4.1.1 (and probably other versions) when using CLOB's with H2 v2.0.202 an error occurs when attempting to save.
>  
> This is due to a change in behaviour in H2 (likely from 1.x) where a CLOB now needs to be saved as a stream.
>  
> In Cayenne, the CharType() has following method which is executed when saving  CLOB for an H2 DB:
>  
>               public void setJdbcObject(PreparedStatement st, String value, int pos, int type, int scale) throws Exception {
>  
>                              // if this is a CLOB column, set the value as "String"
>                              // instead. This should work with most drivers
>                              if (type == Types.CLOB || type == Types.NCLOB) {
>                                            st.setString(pos, value);
>                              } else if (scale != -1) {
>                                            st.setObject(pos, value, type, scale);
>                              } else {
>                                            st.setObject(pos, value, type);
>                              }
>               }
>  
> As the type is a CLOB, when the st.setString(pos, value) gets executed an exception is thrown from H2 as you now need to set a stream as follows:
>  
>     Clob clob = st.getConnection().createClob();
>     clob.setString(1, val);
>     st.setClob(pos, clob);
>  
> As a fix I'm thinking creating a H2CharType() which overrides the setJdbcObject() similar to the OracleCharType() to contain this functionality.
>  
> I'm happy to submit a PR on GitHub with the solution, please advise?
>  
> Kind regards,
> Nigel.
>  
> 
> NIGEL HUBAND 
> TECHNICAL LEAD
> AVOKA APAC
>  
>  
> Level 2, 1a Rialto Lane, Manly
> New South Wales, Australia 2100
> 
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