这是我的代码 `我创建了一个表，但我想创建两个表，当我点击“show”按钮时，我希望能够从两个表中选择内容并显示它们......这是我的代码...我遇到了问题创建两个表并显示它们：
public class Entername extends Activity {
private Button showButton;
private Button insertButton;
private TextView nameEditText;
private TextView addTextView;
private Button doneButton;
public DatabaseHelper dbHelper = new DatabaseHelper(Entername.this,"pubgolfdatabase",2);
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.entername);
addTextView = (TextView)findViewById(R.id.textView1);
doneButton= (Button)findViewById(R.id.doneButton);
insertButton = (Button)findViewById(R.id.addButton);
nameEditText = (EditText)findViewById(R.id.name);
showButton =(Button)findViewById(R.id.button1);
showButton.setOnClickListener(new showButtonListener());
insertButton.setOnClickListener(new InsertButtonListener());
doneButton.setOnClickListener(new DoneButtonListener());
/** create the database if it dosen't exist **/
SQLiteDatabase db = dbHelper.getWritableDatabase();
try
{
db.execSQL("create table user_name(ID integer, name varchar(90));");
}
catch(Exception e)
{
e.printStackTrace();
}
}
class InsertButtonListener implements OnClickListener, android.view.View.OnClickListener
{
public void onClick(View v)
{
if("".equals(nameEditText.getText().toString()))
{
Toast toast = Toast.makeText(Entername.this, "Sorry, you must input both the name and the address!", Toast.LENGTH_LONG);
toast.show();
}
else
{
long flag = 0;
int id = 1;
SQLiteDatabase db = dbHelper.getWritableDatabase();
Cursor cursor = db.query("user_name", new String[]{"count(*) ID"}, null, null, null, null, null);
while(cursor.moveToNext())
{
int idFromDatabase = cursor.getInt(cursor.getColumnIndex("ID"));
if(idFromDatabase != 0)
{
id = 1 + idFromDatabase;
}
}
ContentValues values = new ContentValues();
values.put("ID", id);
values.put("name", nameEditText.getText().toString().trim());
flag = db.insert("user_name", null, values);
if(flag != -1)
{
Toast toast = Toast.makeText(Entername.this, "You have successful inserted this record into database! ", Toast.LENGTH_LONG);
toast.show();
db.close();
//clear fields //clearing edittexts
nameEditText.setText("");
return;
}
else
{
Toast toast = Toast.makeText(Entername.this, "An error occured when insert this record into database!", Toast.LENGTH_LONG);
toast.show();
db.close();
//clear fields
//clearing edittexts
nameEditText.setText("");
return;
}
}
}
public void onClick(DialogInterface dialog, int which)
{
// TODO Auto-generated method stub
}
}
class DoneButtonListener implements OnClickListener, android.view.View.OnClickListener
{
public void onClick(View v)
{
Intent myIntent = new Intent(v.getContext(), Pickholespubs.class);
startActivityForResult(myIntent, 0);
}
public void onClick(DialogInterface dialog, int which)
{
// TODO Auto-generated method stub
}
}
class showButtonListener implements OnClickListener, android.view.View.OnClickListener
{
public void onClick(View v)
{
String display = "";
SQLiteDatabase db = dbHelper.getWritableDatabase();
/** the result will be loaded in cursor **/
Cursor cursor = db.query("user_name", new String[]{"ID","name"}, null, null, null, null, null);
/** check if the table is empty **/
if (!cursor.moveToNext())
{
addTextView.setText("No data to display, please make sure you have already inserted data!");
db.close();
return;
}
cursor.moveToPrevious();
/** if the table is not empty, read the result into a string named display **/
while(cursor.moveToNext())
{
int ID = cursor.getInt(cursor.getColumnIndex("ID"));
String name = cursor.getString(cursor.getColumnIndex("name"));
display = display + "\n"+"Player"+ID+", Name: "+name;
}
/** display the result on the phone **/
addTextView.setText(display);
db.close();
}
public void onClick(DialogInterface dialog, int which)
{
// TODO Auto-generated method stub
}
}
}`
答案 0 :(得分：1)
一个简单的答案就是不，你不能这样做。由于Create Table语法不允许同时进行两次DML操作。
但是alternet的方式如下，
Create Table table1 ( column list ); Create Table table2 ( column list );
这是可能的。道德是每个Create Table语法完成后必须有;（分号）。