为什么没有将值插入数据库？

Question

我的数据库代码是这样的。

        public void addprofileinfo(HashMap<String, String> queryValues){

        SQLiteDatabase database = this.getWritableDatabase();

        ContentValues values = new ContentValues();

        values.put("StudentName", queryValues.get("StudentName"));
        values.put("RegistrationNo", queryValues.get("RegistrationNo"));
        values.put("Faculty", queryValues.get("Faculty"));
        values.put("TotalFeePaid", queryValues.get("TotalFeePaid"));

        database.insert("FEE", null, values);

        database.close();

和Activity代码是： protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.insertfield); editName=(EditText)findViewById(R.id.editTextName); editFaculty=(EditText)findViewById(R.id.editTextfaculty); editFee=(EditText)findViewById(R.id.editTexttotalfeepaid); editRegid=(EditText)findViewById(R.id.editTextid); 保存 = (按钮) findViewById(R.id.buttonsave);

addData();
}

public void addData(){
    save.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            try{

                HashMap<String, String> queryValuesMap = new HashMap<String, String>();

            queryValuesMap.put("StudentName",editName.getText().toString());
            queryValuesMap.put("Faculty", editFaculty.getText().toString());
            queryValuesMap.put("TotalFee",      editFee.getText().toString());
            queryValuesMap.put("RegistrationNo",        editRegid.getText().toString());

            dbtools.addprofileinfo(queryValuesMap);
            Toast.makeText(insertData.this, "Successful!!!", Toast.LENGTH_LONG).show();

            Intent intent;
            intent = new Intent(getApplicationContext(), MainActivity.class);
            startActivity(intent);
            dbtools.close();
            insertData.this.finish();



            }catch(Exception e){
                Toast.makeText(insertData.this, e.getMessage(), Toast.LENGTH_LONG).show();
            }}
            });

显示已成功保存消息，但未在数据库中找到该值。请问这是为什么？

Answer 1

尝试输入：

        dbtools.close();
        insertData.this.finish();

之前：

        Intent intent;
        intent = new Intent(getApplicationContext(), MainActivity.class);
        startActivity(intent);

Answer 2

 Intent intent;
        intent = new Intent(getApplicationContext(), MainActivity.class);
        startActivity(intent);
        dbtools.close();
        insertData.this.finish();

这有效..

Answer 3

但是用起来更好

    dbtools.close();
    insertData.this.finish(); 
    Intent intent;
    intent = new Intent(getApplicationContext(), MainActivity.class);
    startActivity(intent);

即关闭您的数据库并启动活动

为什么没有将值插入数据库？

Why the values are not being inserted in the database?

database

android

android-sqlite