原来我很接近但忘记了一步。
我不得不将查询本身更改为:
BEGIN
UPDATE jasper_report SET Uri = ? WHERE ReportId = ?
IF @@ROWCOUNT = 0 AND EXISTS(SELECT 1 FROM report WHERE Id = ?)
BEGIN
INSERT INTO jasper_report (ReportId, Uri) VALUES (?, ?)
END
END
然后在我的 Dao 中只需要使用Spring 的 JdbcTemplate 更新方法即可。它看起来像这样:
@Repository("jasperReportsDao")
public class JasperReportsDaoImpl extends JdbcTemplate implements JasperReportsDao {
@Override
public void saveJasperReport(JasperReport report) {
// If a record already exists, do an update, otherwise, do an insert
int rowsAffected = this.update(UPSERT_JASPER_REPORT, new Object[] { report.getUri(), report.getId(),
report.getId(), report.getId(), report.getUri()} );
if(log.isDebugEnabled()) { log.debug("Rows affected: " + rowsAffected); }
}
}