TP框架对数据库的操作

1.添加数据

      1.1添加一条数据

$user           = new User;
$user->name     = 'thinkphp';
$user->email    = 'thinkphp@qq.com';
$user->save();

$user = new User;
$user->save([
    'name'  =>  'thinkphp',
    'email' =>  'thinkphp@qq.com'
]);

1.2过滤非数据表字段的数据

$user = new User;
// 过滤post数组中的非数据表字段数据
$user->allowField(true)->save($_POST);

 1.3指定某些字段数据

$user = new User;
// post数组中只有name和email字段会写入
$user->allowField(['name','email'])->save($_POST);

 1.4添加多条数据

$user = new User;
$list = [
    ['name'=>'thinkphp','email'=>'thinkphp@qq.com'],
    ['name'=>'onethink','email'=>'onethink@qq.com']
];
$user->saveAll($list);

1.5静态方法 

$user = User::create([
    'name'  =>  'thinkphp',
    'email' =>  'thinkphp@qq.com'
]);
echo $user->name;
echo $user->email;
echo $user->id; // 获取自增ID

2.更新数据

          2.1查找并更新

$user = User::get(1);
$user->name     = 'thinkphp';
$user->email    = 'thinkphp@qq.com';
$user->save();

2.2直接更新数据

$user = new User;
// save方法第二个参数为更新条件
$user->save([
    'name'  => 'thinkphp',
    'email' => 'thinkphp@qq.com'
],['id' => 1]);

 2.3 过滤非数据表字段

$user = new User;
// 过滤post数组中的非数据表字段数据
$user->allowField(true)->save($_POST,['id' => 1]);

2.4指定某些字段

$user = new User();
// post数组中只有name和email字段会写入
$user->allowField(['name','email'])->save($_POST, ['id' => 1]);

            2.5批量更新数据

$user = new User;
$list = [
    ['id'=>1, 'name'=>'thinkphp', 'email'=>'thinkphp@qq.com'],
    ['id'=>2, 'name'=>'onethink', 'email'=>'onethink@qq.com']
];
$user->saveAll($list);

2.6静态方法

User::where('id', 1)
    ->update(['name' => 'thinkphp']);

2.7自动识别

            2.7.1显示更新数据

// 实例化模型
$user = new User;
// 显式指定更新数据操作
$user->isUpdate(true)
    ->save(['id' => 1, 'name' => 'thinkphp']);

2.7.2显示新增数据

$user = User::get(1);
$user->name = 'thinkphp';
// 显式指定当前操作为新增操作
$user->isUpdate(false)->save();

3.删除数据

            3.1删除当前模型

$user = User::get(1);
$user->delete();

3.2根据主键删除

User::destroy(1);
// 支持批量删除多个数据
User::destroy('1,2,3');
// 或者
User::destroy([1,2,3]);

 3.3条件删除

User::destroy(function($query){
    $query->where('id','>',10);
});

4.查询数据

              4.1获取单个数据

// 取出主键为1的数据
$user = User::get(1);
echo $user->name;

// 使用查询构造器查询满足条件的数据
$user = User::where('name', 'thinkphp')->find();
echo $user->name;

 4.2获取多个数据

// 根据主键获取多个数据
$list = User::all('1,2,3');
// 或者使用数组
$list = User::all([1,2,3]);
// 对数据集进行遍历操作
foreach($list as $key=>$user){
    echo $user->name;
}

// 使用查询构造器查询
$list = User::where('status', 1)->limit(3)->order('id', 'asc')->select();
foreach($list as $key=>$user){
    echo $user->name;
}

  4.3获取某个字段或者某个列的值

// 获取某个用户的积分
User::where('id',10)->value('score');
// 获取某个列的所有值
User::where('status',1)->column('name');
// 以id为索引
User::where('status',1)->column('name','id');