package cn.itcast.datasource.jdbctemplate;import cn.itcast.domain.User;import cn.itcast.utils.JDBCUtils;import org.junit.Test;import org.springframework.jdbc.core.BeanPropertyRowMapper;import org.springframework.jdbc.core.JdbcTemplate;import org.springframework.jdbc.core.RowMapper;import java.sql.ResultSet;import java.sql.SQLException;import java.util.List;import java.util.Map;/** * @author newcityman * @date 2019/8/17 - 21:05 */public class JdbcTemplateDemo02 { /* * 根据id号，修改user对象 * */ // 获取JdbcTemplate对象 private JdbcTemplate temp = new JdbcTemplate(JDBCUtils.getDataSource()); @Test public void test01() {// 定义sql String sql = "update user set name=?,email=?,tel=? where id=?";// 执行sql语句 int i = temp.update(sql, "light", "23235@qq.com", "13770578331", 3);// 判断执行结果 if (i > 0) { System.out.println("数据修改成功"); } else { System.out.println("数据修改失败"); } } /* * 添加一条记录 * */ @Test public void test02() { // 定义sql String sql = "insert into user(id,name,email,tel) values(null,?,?,?)"; // 执行sql语句 int i = temp.update(sql, "小猪", "3254@qq.com", "177025874");// 判断执行结果 if (i > 0) { System.out.println("数据添加成功"); } else { System.out.println("数据添加失败"); } } /* * 删除id=7的记录 * */ @Test public void test03() {// 定义sql语句 String sql = "delete from user where id=?";// 执行sql语句 int i = temp.update(sql, 7);// 判断执行结果 if (i > 0) { System.out.println("数据删除成功"); } else { System.out.println("数据删除失败"); } } /* * 查询指定id的记录，并将其封装为Map集合 * */ @Test public void test04(){// 定义sql String sql="select id,name,email,tel from user where id=?"; Map<String, Object> map = temp.queryForMap(sql, 3); System.out.println(map); } /* * 查询所有记录，并将其封装为list集合 * */ @Test public void test05(){ String sql="select * from user"; List<Map<String, Object>> list = temp.queryForList(sql); for (Map<String, Object> obj : list) { System.out.println(obj); } } /* * 查询所有记录，并将其封装为emp对象的集合 * */ @Test public void test06(){ String sql ="select id ,name ,email ,tel from user "; List<User> list = temp.query(sql, new RowMapper<User>() { @Override public User mapRow(ResultSet rs, int i) throws SQLException { User user = new User(); int id = rs.getInt("id"); String name = rs.getString("name"); String email = rs.getString("email"); String tel = rs.getString("tel"); user.setId(id); user.setName(name); user.setEmail(email); user.setTel(tel); return user; } }); for (User user : list) { System.out.println(user); } } /* * 查询所有记录，并将其封装为emp对象的集合 * */ @Test public void test06_2(){ String sql ="select id ,name ,email ,tel from user "; List<User> list = temp.query(sql, new BeanPropertyRowMapper<User>(User.class)); for (User user : list) { System.out.println(user); } } /* * 查询所有记录数 * */ @Test public void test07(){ String sql ="select count(id) from user"; Long count = temp.queryForObject(sql, Long.class); System.out.println(count); }}
来源：https://www.cnblogs.com/newcityboy/p/11370872.html