Introducing Spring Framework

Chapter 9 ■ Adding Persistence to Your Spring Application
Listing 9-15 shows how you can reduce the amount of code by using the JdbcTemplate class, where you can pass
the query and the row mapper. The JdbcTemplate implements a Template Design pattern that does the heavy work of
calling the JDBC directly, and therefore provides easy methods for executing SQL statements.
Next, let’s create the DocumentRowMapper class as shown in Listing 9-16.
Listing 9-16. DocumentRowMapper
package com.apress.isf.spring.jdbc;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.springframework.jdbc.core.RowMapper;
import com.apress.isf.java.model.Document;
import com.apress.isf.java.model.Type;
public class DocumentRowMapper implements RowMapper {
}
public Document mapRow(ResultSet rs, int rowNum) throws SQLException {
Document document = new Document();
document.setDocumentId(rs.getString("documentId"));
document.setName(rs.getString("name"));
document.setLocation(rs.getString("location"));
document.setCreated(rs.getDate("created"));
document.setModified(rs.getDate("modified"));
document.setDescription("doc_desc");
Type type = new Type();
type.setTypeId(rs.getString("typeId"));
type.setName(rs.getString("type_name"));
type.setDesc(rs.getString("type_desc"));
type.setExtension(rs.getString("extension"));
document.setType(type);
return document;
}
Listing 9-16 shows how to implement the RowMapper interface. You can see that the Spring Framework will
iterate every row and create the result list you need: the Document model. If you take this approach, you will have more
readable code.
Next, let’s create the XML configuration that will contain the new reference to the
DocumentJdbcTemplateRepository class as shown in Listing 9-17.
Listing 9-17. mydocuments-jdb-template-context.xml