"@gmail"附近的语法错误

Question

我正在使用布尔函数创建登录活动,但是在匹配电子邮件地址与数据库中的电子邮件地址时会出错,但会出错

这是我的dbHandler类方法:

 public Boolean loginCheck(String email,String password)
{
    Boolean flag=false;
    String selectQuery = "SELECT  * FROM " + TABLE_NAME + " WHERE email=" + email +" AND pass="+password;

    SQLiteDatabase db = this.getReadableDatabase();
    Cursor cursor = db.rawQuery(selectQuery, null);
    // Move to first row
    cursor.moveToFirst();
    if(cursor.getCount() == 1){
      flag=true;
    }
    else
    {
      flag=false;
    }

    return flag;
}

这是java文件代码

login.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            String emailValue=edtEmail.getText().toString();//this is EditText
            String passValue=edtPass.getText().toString();

            if(db.loginCheck(emailValue, passValue))
            {
                Intent in = new Intent(getApplicationContext(), Home.class);
                startActivity(in);
                Toast.makeText(getApplicationContext(), "Login Successful", 2000).show();
            }
            else
            {
                Toast.makeText(getApplicationContext(), "Username and Password not match", 5000).show();
            }
        }
    });

得到错误

 01-23 04:58:30.519: E/AndroidRuntime(2422):                                                     android.database.sqlite.SQLiteException: near "@gmail": syntax error (code  1): , while compiling: SELECT  * FROM login WHERE email=stackoverflow@gmail.com AND pass=stackoverflow
 01-23 04:58:30.519: E/AndroidRuntime(2422):    at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
  01-23 04:58:30.519: E/AndroidRuntime(2422):   at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:882)

请提供解决方案

Answer 1

问题是你没有用单引号传递字符串.

最好使用rawQuery参数'String array as:

Cursor cursor = db.rawQuery(
        "select * from "+TABLE_NAME +" where email = ? and pass = ? ", new String[]{email, password});

希望这可以帮助.