使用JDBCTemplate执行DQL/DML语句

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", "[email protected]", "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", "[email protected]", "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);
 }

}