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", "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);
    }

}