Question

这是我将数据添加到数据库的代码。

stop(); //add a stop function too!

var gameOver: Boolean = false;

var mainSpeed: Number = 10; //how fast the main guy can move

//BULLET TIMING VARIABLES
var cTime: Number = 0; //the amount of frames that has elapsed since last bullet shot
var cLimit: Number = 12; //amount of frames needed to shoot another bullet
var shootAllow: Boolean = false; //whether or not main can shoot
//ENEMY TIMING VARIABLES
//how much time before another enemy is made
var enemyTime: Number = 0;
//how much time needed to make an enemy
//it should be more than the shooting rate
//or else killing all of the enemies would
//be impossible :O
var enemyLimit: Number = 50;
//showing the amount of enemies that have been added to the stage
var enemyTotal: Number = 0;

//the player's score
var score: Number = 0;

//this movieclip will hold all of the bullets
_root.createEmptyMovieClip('bulletHolder', _root.getNextHighestDepth());

onEnterFrame = function() { //this function will run every frame (needed for moving the character
  if (Key.isDown(37) || Key.isDown(65)) { //if the "A" key or Left Arrow Key is Down
    bat._x -= mainSpeed; //then the move the guy left
  }
  if (Key.isDown(38) || Key.isDown(87)) { //if the "W" key or Up Arrow Key is Down
    bat._y -= mainSpeed; //then move the guy up
  }
  if (Key.isDown(39) || Key.isDown(68)) { //if the "D" key or Right Arrow Key is Down
    bat._x += mainSpeed; //then move the guy to the right
  }
  if (Key.isDown(40) || Key.isDown(83)) { //if the "S" key or Down Arrow Key is Down
    bat._y += mainSpeed; //then move the guy down
  }

  //keeping the main character within bounds
  if (bat._x <= 0) {
    bat._x += mainSpeed;
  }
  if (bat._y <= 0) {
    bat._y += mainSpeed;
  }
  if (bat._x >= 500) {
    bat._x -= mainSpeed;
  }
  if (bat._y >= 500) {
    bat._y -= mainSpeed;
  }

  if (Key.isDown(32) && shootAllow) { //if the space bar is pressed
    var bulletID: Number = Math.random(); //create a variable that we'll use at the bullet's id
    //then attach a bullet to the stage
    bulletHolder.attachMovie('fire', 'Bullet' + bulletID, _root.getNextHighestDepth());
    //setting the coordinates of the bullet to be the same as the main character
    bulletHolder['Bullet' + bulletID]._x = bat._x;
    bulletHolder['Bullet' + bulletID]._y = bat._y - 70;
    bulletHolder['Bullet' + bulletID].onEnterFrame = function() {
      //giving the bullet some actions
      this._y -= 50; //moving the bullet
      if (this._y < -1 * this._height) { //if the bullet goes off stage
        //then destroy it
        this.removeMovieClip();
      }

      //checking if the game is over
      if (gameOver) {
        //destroy this guy if the game is over
        this.removeMovieClip();
      }
    }
    shootAllow = false;
  }

  cTime++; //increment the time
  if (cTime == cLimit) { //if enough time has elapsed
    shootAllow = true; //allow shooting again
    cTime = 0; //reset the time
  }

  enemyTime++; //incrementing time for enemy
  if (enemyTime == enemyLimit) { //if enough time has elapsed
    _root.attachMovie('thug', 'en' + enemyTotal, _root.getNextHighestDepth()); //then add the enemy
    //setting it's coordinates
    _root['en' + enemyTotal]._x = int(Math.random() * Stage.width); //randomly within the boundaries
    _root['en' + enemyTotal]._y = -50; //sets this offstage at first
    _root['en' + enemyTotal].onEnterFrame = function() { //then give it some functions
      this._y += 5;

      //run a loop checking if it's touching any bullets
      for (var cBullet: String in _root.bulletHolder) {
        //if it's touching the bullet
        //we have to use coordinates because hit testing doesn't seem to work
        if (this._y >= _root.bulletHolder[cBullet]._y - 50 && this._y <= _root.bulletHolder[cBullet]._y) {
          if (this._x <= _root.bulletHolder[cBullet]._x + 25 && this._x >= _root.bulletHolder[cBullet]._x - 55) {
            //then destroy this guy
            //this is where I tried to make it work but
            //it just change the movieclip but not removed it
            this.gotoAndStop(2)
            if (_root.thug.frame = 2) {
              _root.thug.removeMovieClip();
            }
            //and destroy the bullet
            _root.bulletHolder[cBullet].removeMovieClip();

            //up the score
            _root.score += 5;
          }
        }
      }

      //hit testing with the user
      if (this.hitTest(_root.bat)) {
        //set the game to be over and go to lose screen
        gameOver = true;
        gotoAndStop(2);
      }

      //checking if the game is over
      if (gameOver) {
        //destroy this guy if the game is over
        this.removeMovieClip();
      }
    }
    enemyTime = 0; //reset the time
    enemyTotal++; //add 1 more to the amount of enemies total
  }

  //updating the score text field
  txtScore.text = 'Score:  ' + score;
}

当我运行此代码时，会出现错误消息

必须声明标量变量@tell

为什么会收到这样的错误消息？我的代码错了吗？你能帮我摆脱这个问题吗？

这是我收到的错误消息：

Error message.

Answer 1

您需要更改第3个参数。

更改cmnd.Parameters.Add("@tel", SqlDbType.NVarChar).Value = tel;

到

cmnd.Parameters.Add("@tell", SqlDbType.NVarChar).Value = tel;

您声明的sql中的参数名称不同

Answer 2

似乎有一个拼写错误，它应该是@tell（注意加倍l）。

为什么这个C＃代码无法向我的数据库添加行？

2 个答案: