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From Julien Aymé (JIRA) <>
Subject [jira] Commented: (DBUTILS-54) Generated key handling for updates
Date Thu, 22 Oct 2009 10:52:59 GMT


Julien Aymé commented on DBUTILS-54:

We should think about it, since there is three methods to indicate that the generated keys
should be returned:

The first one just tells that the generated keys should be returned:
{code}Connection#prepareStatement(String, int){code},%20int%29

The second one specifies the names of the columns from which the keys should be generated
{code}Connection#prepareStatement(String, String[]){code},%20java.lang.String[]%29

and the last one specifies the indexes of the columns from which the keys should be generated
{code}Connection#prepareStatement(String, int[]){code},%20int[]%29

I'm willing to contribute a path with all three methods (this will however add a lot of code
into QueryRunner).

> Generated key handling for updates
> ----------------------------------
>                 Key: DBUTILS-54
>                 URL:
>             Project: Commons DbUtils
>          Issue Type: Improvement
>    Affects Versions: 1.2, Nightly Builds
>            Reporter: Michael V
>            Priority: Minor
> It would be great (and fairly easy to do) to provide a way to get autogenerated keys
from QueryRunner.update. There was an email thread about this in 2004 but it seems it never
was actually implemented.
> The thought is to provide an ability to recover generated keys, for instance by providing
a result set handler, in which case prepared statement would be generated with RETURN_GENERATED_KEYS
and getGeneratedKeys() would be passed to the result handler.
> It seems that in 1.2 there is a way to get PreparedStatement and work with QueryRunner
more as a support to JDBC but IMO it would be cool to add this feature.
> example solution:
> {noformat} 
>     public int update(Connection conn, String sql, Object... params)
>         throws SQLException {
>           update(sql, null, params);
>     }
>     protected PreparedStatement prepareStatement(Connection conn, String sql, int autoGeneratedKeys)
>         throws SQLException {
>         return conn.prepareStatement(sql, autoGeneratedKeys);
>     }
>     public int update(Connection conn, String sql, ResultSetHandler<?> rsh, Object...
>         throws SQLException {
>         PreparedStatement stmt = null;
>         int rows = 0;
>         try {
>             stmt = this.prepareStatement(conn, sql, rsh==null?Statement.NO_GENERATED_KEY:Statement.RETURN_GENERATED_KEYS);
>             this.fillStatement(stmt, params);
>             rows = stmt.executeUpdate();
>             if(rsh!=null)
>                  rsh.handle(stmt.getGeneratedKeys());
>         } catch (SQLException e) {
>             this.rethrow(e, sql, params);
>         } finally {
>             close(stmt);
>         }
>         return rows;
>     }
> {noformat} 
> Thanks!

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