第一周学习知识点总结及感悟

第一部分-知识点

1.git命令

• 把主分支项目拉取下来
  git fetch
  git merge origin/master
  git diff //查看有没有冲突
• 上传分支
  cd 文件夹名称
  git add .
  git commit -m 写说明这是干嘛的
  git branch //这是创建分支
  git checkout //这是切换分支
  git push origin fengxiaobin:fengxiaobin 把分支推送到远程
  git status 查看状态

2. 使用PDO连接数据库实现增删改查功能

• 连接到数据库

function db(){
   try {
     $pdo = new PDO(mysql:host=" "; dbname=" ", username="root", passwd=" ");
     return $pdo;}catch ($e) {
     die("fail to connect mysql" .$e ->getMessage());
} 
}

• 增加

function add($data) {
  $pdo = db();
  $sql = "INSERT INTO photo (name,path) VALUES(?,?)";
  $std = $pdo -> prepare($sql);
  $res = $std -> execute($data);
  return $res;
}  

• 删除

function delete($id) {
  $pdo = db();
  $sql = "DELETE from photo where id = ?";
  $std = $pdo -> prepare($sql);
  $res = $std -> execute([$id]);
  return $res;
}

• 修改

function update($data){
  $pdo = db();
  $sql = "UPDATE photo set name = ?,path = ? where id = ?";
  $std = $pdo -> prepare($sql);
  $res = $std ->execute($data);
  return $res;
}

• 查询

function select() {
  $pdo = db();
  $sql = "select * from photo";
  $std = $pdo -> query($sql);
  $res = $std -> fetchALL();
  return $res;
}

• 查询id

function selectOne($id) {
  $pdo = db();
  $sql = "select * from photo where id = $id";
  $std = $pdo -> query($sql);
  $res = $std -> fetch();
  return $res;
} 

• 全局配置

define('DB_ADDRESS','127.0.0.1');
define('DB_NAME','sys-photo');
define('DB_USER','root');
define('DB_PASS','123456');