Vorrei utilizzare uno FactoryBean
di tipo <Properties>
che implementerei utilizzando JdbcTemplate
. È quindi possibile utilizzare l'oggetto Properties
generato con il meccanismo <context:property-placeholder>
.
codice di esempio: Configurazione
public class JdbcPropertiesFactoryBean
extends AbstractFactoryBean<Properties>{
@Required
public void setJdbcTemplate(final JdbcTemplate jdbcTemplate){
this.jdbcTemplate = jdbcTemplate;
}
private JdbcTemplate jdbcTemplate;
@Required
public void setTableName(final String tableName){
this.tableName = tableName;
}
private String tableName;
@Required
public void setKeyColumn(final String keyColumn){
this.keyColumn = keyColumn;
}
private String keyColumn;
@Required
public void setValueColumn(final String valueColumn){
this.valueColumn = valueColumn;
}
private String valueColumn;
@Override
public Class<?> getObjectType(){
return Properties.class;
}
@Override
protected Properties createInstance() throws Exception{
final Properties props = new Properties();
jdbcTemplate.query("Select " + keyColumn + ", " + valueColumn
+ " from " + tableName, new RowCallbackHandler(){
@Override
public void processRow(final ResultSet rs) throws SQLException{
props.put(rs.getString(1), rs.getString(2));
}
});
return props;
}
}
XML:
<bean id="props" class="foo.bar.JdbcPropertiesFactoryBean">
<property name="jdbcTemplate">
<bean class="org.springframework.jdbc.core.JdbcTemplate">
<!-- reference to a defined data source -->
<constructor-arg ref="dataSource" />
</bean>
</property>
<property name="tableName" value="TBL_PROPERTIES" />
<property name="keyColumn" value="COL_KEY" />
<property name="valueColumn" value="COL_VAL" />
</bean>
<context:property-placeholder properties-ref="props" />
fonte
2011-01-05 08:01:52