SpringDao操作——查询、增加方法

新建一个实体类User  （@Component注解，将一个对象放入容器中。）

新建一个接口UserDaoIface

package com.zhaoming.dao.iface;
import java.util.List;
import com.zhaoming.entity.User;
public interface UserDaoIface {
    public List<User> queryAll();
    public User addUser(User user); 
}

新建一个实现类UserDaoImp

package com.zhaoming.dao.imp;


import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.List;
import javax.annotation.Resource;
import org.springframework.jdbc.core.ConnectionCallback;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.core.RowMapper;
import org.springframework.stereotype.Repository;
import com.zhaoming.dao.iface.UserDaoIface;
import com.zhaoming.entity.User;


@Repository

public class UserDaoImp implements UserDaoIface{

    @Resource
    JdbcTemplate jdbcTemplate;
    /*
    @Override
    public List<User> queryAll() {
        String sql = "select * from users";
        List<User> list = jdbcTemplate.query(sql, new RowMapper<User>() {  //匿名内部类

            public User mapRow(ResultSet rs, int arg1) throws SQLException {
                User user = new User(rs.getInt(1), rs.getString(2), rs.getString(3), rs.getString(4));
                return user;
            }
        });
*/
    //兰姆达表达式
    @Override
    public List<User> queryAll() {
        String sql = "select * from users";
        List<User> list = jdbcTemplate.query(sql, (RowMapper<User>) (rs,index)->
             new User(rs.getInt(1), rs.getString(2), rs.getString(3), rs.getString(4))
        );
        return list;
    }
    @Override
    public User addUser(User user) {
        String sql = "insert into users values(seq_uid.nextval,?,?,?)";
        User user0 = jdbcTemplate.execute((ConnectionCallback<User>) (connection) ->{

                PreparedStatement psmt = connection.prepareStatement(sql,new String[]{"id"});
                psmt.setString(1,user.getName() );
                psmt.setString(2, user.getPassword());
                psmt.setString(3, user.getTelephone());
                psmt.executeUpdate();
                ResultSet rs = psmt.getGeneratedKeys();
                if(rs.next())
                {
                    user.setId(rs.getInt(1));
                }
                return user;
        
        });
        return user0;
    }

}

测试

package com.zhaoming.userdao;

import java.util.List;
import javax.annotation.Resource;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import com.zhaoming.dao.imp.UserDaoImp;
import com.zhaoming.entity.User;
import spring.config.DataSourceConfig;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = {DataSourceConfig.class})
public class UserDaoTest {

    @Resource
    UserDaoImp userDao;
    public void testQuery(){ 
        List<User> list = userDao.queryAll();
        for (User user : list) {
            System.out.println(user.getName());
        }
    }
    
    @Test
    public void testAdd(){
        User user = new User(0, "admin", "123", "321");
        User user0 = userDao.addUser(user);
        System.out.println(user0.getId());
    }
}