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| package xyz.shi.service;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.support.GeneratedKeyHolder;
import org.springframework.jdbc.support.KeyHolder;
import org.springframework.stereotype.Service;
import xyz.shi.entity.User;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
@Service
public class UserService1 {
@Autowired
private JdbcTemplate jdbcTemplate;
public int save(String name, String pwd) {
//该类返回新增记录时的自增长主键值。
KeyHolder keyHolder = new GeneratedKeyHolder();
int update = jdbcTemplate.update((connection) -> {
PreparedStatement ps = connection.prepareStatement("insert into users(name,password) values(?,?)", Statement.RETURN_GENERATED_KEYS);
ps.setObject(1, name);
ps.setObject(2, pwd);
return ps;
}, keyHolder);
if (update > 0){
System.out.println("保存成功...user id:"+keyHolder.getKey());
}
return keyHolder.getKey().intValue();
}
/**
* 根据用户id 查询
* @param id
* @return
*/
public User getUser(int id){
User user = jdbcTemplate.queryForObject("select * from users where id = ?", new Object[]{id},new BeanPropertyRowMapper<>(User.class));
return user;
}
/**
* 分页查询
* @param page
* @param pageSize
* @return
*/
public List<User> queryUserList(int page, int pageSize){
int index = (page-1)*pageSize;
int size = pageSize;
List<User> list = jdbcTemplate.query("select * from users limit ?,?", new Object[]{index, size}, new BeanPropertyRowMapper<>(User.class));
return list;
}
/**
* 更新
* @param id
* @param name
* @return
*/
public boolean update(int id,String name){
int update = jdbcTemplate.update("update users set name=? where id=?", name, id);
if (update > 0){
return true;
}
throw new RuntimeException("update error");
}
public boolean delete(int id){
int deleteCount = jdbcTemplate.update("delete from users where id=?", id);
return deleteCount > 0;
}
// execute的用法
public List<User> execute1(int page,int pageSize) {
return jdbcTemplate.execute((Connection conn) -> {
PreparedStatement ps = conn.prepareStatement("select * from users limit ?,?");
ps.setObject(1, (page - 1) * pageSize);
ps.setObject(2, pageSize);
ResultSet resultSet = ps.executeQuery();
List<User> userList = new ArrayList<>();
while (resultSet.next()) {
User user = new User();
user.setId(resultSet.getInt("id"));
user.setName(resultSet.getString("name"));
user.setPassword(resultSet.getString("password"));
userList.add(user);
}
return userList;
});
}
}
|