de.olivergierke.spring4.java8.JdbcRepository.java Source code

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Here is the source code for de.olivergierke.spring4.java8.JdbcRepository.java

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/*
 * Copyright 2013 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package de.olivergierke.spring4.java8;

import javax.sql.DataSource;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.PreparedStatementSetter;
import org.springframework.jdbc.core.RowMapper;

/**
 * @author Oliver Gierke
 */
class JdbcRepository {

    private final JdbcTemplate template;

    /**
     * @param template
     */
    public JdbcRepository(DataSource dataSource) {
        this.template = new JdbcTemplate(dataSource);
    }

    public void executeQueryWithPreparedStatementAndRowMapper() {

        template.query("SELECT name, age FROM person WHERE dep = ?", ps -> ps.setString(1, "Sales"),
                (rs, rowNum) -> new Person(rs.getString(1), rs.getString(2)));

        // VS.

        template.query("SELECT name, age FROM person WHERE dep = ?", new PreparedStatementSetter() {
            @Override
            public void setValues(PreparedStatement ps) throws SQLException {
                ps.setString(1, "Sales");
            }
        }, new RowMapper<Person>() {
            @Override
            public Person mapRow(ResultSet resultSet, int i) throws SQLException {
                return new Person(rs.getString(1), rs.getString(2));
            }
        });
    }

    public void executeQueryWithPreparedStatementAndMethodReference() {

        template.query("SELECT name, age FROM person WHERE dep = ?", ps -> ps.setString(1, "Sales"),
                this::mapPerson);
    }

    // RowMapper
    private Person mapPerson(ResultSet rs, int rowNum) throws SQLException {
        return new Person(rs.getString(1), rs.getString(2));
    }

    static class Person {

        public Person(String firstname, String lastname) {

        }
    }
}