Question

我想更新数据库中的值并使用按钮

启动它

Button b1 = (Button) findViewById(R.id.update);
b1.setOnClickListener(new Button.OnClickListener() {
    public void onClick(View v){
        ContentValues cv=new ContentValues(); 
        cv.put("word",word); 
        cv.put("definition", def); 
        database.rawQuery("update priv_dbms set word ='"+word+"',
                              definition='"+def+"'", null);
        Toast.makeText(getApplicationContext(),
                    "Successfully Updated!!",
        Toast.LENGTH_SHORT).show();
        Intent intent = new Intent (v.getContext(), Priv_DBMS.class);
        startActivityForResult(intent, 0);
    }
});

当我启动应用程序时，没有错误，但数据库中的值不会更新。

这是我从编辑文本中获取值的代码：

passedVar=getIntent().getStringExtra(WordExtend_priv_dbms.ID_EXTRA2);
passedView = (EditText)findViewById(R.id.editword);
passedView.setText(passedVar);
passedVar1=getIntent().getStringExtra(WordExtend_priv_dbms.ID_EXTRA1);
passedView1 = (EditText)findViewById(R.id.editdef);
passedView1.setText(passedVar1)
word = passedView.getText().toString();
def = passedView1.getText().toString();

Answer 1

在onclick ::

中试试这个

String query = "update priv_dbms set word =\""+word+"\", definition=\""+def+"\"";

SQLiteDatabase db = getWritableDatabase();
db.execSQL(query);

db.close();

Toast.makeText(getApplicationContext(),
                    "Successfully Updated!!",
Toast.LENGTH_SHORT).show();
Intent intent = new Intent (v.getContext(), Priv_DBMS.class);
startActivityForResult(intent, 0);

Answer 2

我忘了把它放在onClick

中

String word = passedView.getText().toString();
String def = passedView1.getText().toString();

passedView和passedView1来自此处

passedView = (EditText)findViewById(R.id.editword);
passedView1 = (EditText)findViewById(R.id.editdef);

感谢您的回答!!

无法更新数据库中的值

2 个答案: