[英]Database cannot be resolved to a variable
There was an Error in creating the Database and it was indicating the error word "Database" and it was displaying error: 创建数据库时发生错误,它指示错误词“数据库”,并且显示错误:
Database cannot be resolved a variable
So please tell me how to rectify it. 所以,请告诉我如何纠正它。
package com.flocater;
import com.flocator.R;
import android.app.Activity;
import android.content.ContentValues;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
public class AddFriends extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.addfriends);
}
public void addFriend(View v) {
// get access to views
EditText editName = (EditText) this.findViewById(R.id.editName1);
EditText editPhone = (EditText) this.findViewById(R.id.editPhone1);
EditText editArea = (EditText) this.findViewById(R.id.editArea1);
EditText editCity = (EditText) this.findViewById(R.id.editCity1);
try {
DBHelper dbhelper = new DBHelper(this);
SQLiteDatabase db = dbhelper.getWritableDatabase();
Log.d("Account", "Got Writable database");
// execute insert command
ContentValues values = new ContentValues();
values.put(Database.FRIENDS_NAME, editName.getText().toString());
values.put(Database.FRIENDS_PHONE, editPhone.getText().toString());// "The error was displayed in the word Database"
values.put(Database.FRIENDS_AREA, editArea.getText().toString());
values.put(Database.FRIENDS_CITY, editCity.getText().toString());
long rows = db.insert(Database.FRIENDS_TABLE_NAME, null, values);
db.close();
if (rows > 0) {
Toast.makeText(this, "Added Friend Successfully!",
Toast.LENGTH_LONG).show();
this.finish();
} else
Toast.makeText(this, "Sorry! Could not add Friend!",
Toast.LENGTH_LONG).show();
} catch (Exception ex) {
Toast.makeText(this, ex.getMessage(), Toast.LENGTH_LONG).show();//print message
}
}``
}
You did not share the DBHelper class, But with the available information, I think you should try DBHelper instead of Database in ALL the lines where you are using values.put().. 您没有共享DBHelper类,但是根据可用的信息,我认为您应该在使用values.put()的所有行中尝试使用DBHelper而不是Database。
values.put(DBHelper.FRIENDS_NAME, editName.getText().toString());
values.put(DBHelper.FRIENDS_PHONE, editPhone.getText().toString());
values.put(DBHElper.FRIENDS_AREA, editArea.getText().toString());
values.put(DBHelper.FRIENDS_CITY, editCity.getText().toString());
And also in insert method: 并且在插入方法中:
long rows = db.insert(DBHelper.FRIENDS_TABLE_NAME, null, values);
All the best 祝一切顺利
For the exception debug and verify SQL Script you are creating in Friendfinderactivity
at line no 36. 对于异常调试和验证SQL脚本,请在第36行的
Friendfinderactivity
中创建。
The following is the query that would be created by your code: select * from SQLiteDatabasenull
, which has wrong syntax. 以下是将由您的代码创建的查询:
select * from SQLiteDatabasenull
,语法错误。
That's the issue. 这就是问题。
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