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データベースにユーザイベントを格納するアプリケーションを開発しています。その目的のためにSQLiteを使用していますが、クエリを実行しているときにエラーが発生します。以下 は、ボタンを追加したときにアクションをトリガ私のコードでクリックされた： -テーブル作成時にCodename SQLiteエラーが発生しました
add.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent evt) {
Log.p(dateLabel.getText().toString());
//if((dateLabel.getText() == null) && (eventArea.getText() == null) && (descriptionArea.getText() == null)){
if ((dateLabel.getText() == "") || (eventArea.getText() == "") || (descriptionArea.getText() == "")) {
Dialog.show("Required field", "Please fill all the fields", "OK", "");
}
//}
else {
Label date1 = new Label("Event Date:- ");
Label dateLabel1 = new Label(dateLabel.getText());
Label event1 = new Label("Event:- ");
Label eventArea1 = new Label(eventArea.getText());
Label description1 = new Label("Event Description:- ");
Label descriptionArea1 = new Label(descriptionArea.getText());
Container container1 = TableLayout.encloseIn(2, date1, dateLabel1, event1, eventArea1, description1, descriptionArea1);
container1.setUIID("container");
saveEvent.add(container1);
ToastBar.showMessage("Event successfull saved", FontImage.MATERIAL_SAVE, 4000);
//Databse Working
try {
db = Display.getInstance().openOrCreate("Events.db");
cur = db.executeQuery("CREATE TABLE 'calendar' ('Date' DATE NOT NULL,'Event' VARCHAR(250) NOT NULL,'Description' VARCHAR(500) NOT NULL);");
String[] values = new String[] {
dateLabel.getText(), eventArea.getText(), descriptionArea.getText()
};
db.execute("INSERT INTO data('Date','Event','Description') VALUES(?,?,?)", values);
Button database = new Button("Database");
calendar.add(database);
database.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent evt) {
try {
cur = db.executeQuery("SELECT * FROM data");
int columns = cur.getColumnCount();
DataEvent.removeAll();
if (columns > 0) {
boolean next = cur.next();
if (next) {
ArrayList <String[]> data = new ArrayList < >();
String[] columnNames = new String[columns];
for (int iter = 0; iter < columns; iter++) {
columnNames[iter] = cur.getColumnName(iter);
}
while (next) {
Row currentRow = cur.getRow();
String[] currentRowArray = new String[columns];
for (int iter = 0; iter < columns; iter++) {
currentRowArray[iter] = currentRow.getString(iter);
}
data.add(currentRowArray);
next = cur.next();
}
Object[][] arr = new Object[data.size()][];
data.toArray(arr);
DataEvent.add(BorderLayout.CENTER, new Table(new DefaultTableModel(columnNames, arr)));
} else {
DataEvent.add(BorderLayout.CENTER, "Query returned no results");
}
} else {
DataEvent.add(BorderLayout.CENTER, "Query returned no results");
}
DataEvent.revalidate();
Util.cleanup(db);
Util.cleanup(cur);
} catch (IOException e) {
e.printStackTrace();
}
}
});
し、アプリケーションによってスローされたエラーは以下の通りです： -
java.sql.SQLException: Query does not return results
at org.sqlite.PrepStmt.executeQuery(PrepStmt.java:104)
at com.codename1.impl.javase.SEDatabase.executeQuery(SEDatabase.java:172)
at com.pivotal.calendar.Calender$4.actionPerformed(Calender.java:211)
at com.codename1.ui.util.EventDispatcher.fireActionEvent(EventDispatcher.java:349)
at com.codename1.ui.Button.fireActionEvent(Button.java:435)
at com.codename1.ui.Button.released(Button.java:467)
at com.codename1.ui.Button.pointerReleased(Button.java:566)
at com.codename1.ui.Form.pointerReleased(Form.java:2642)
at com.codename1.ui.Form.pointerReleased(Form.java:2578)
at com.codename1.ui.Component.pointerReleased(Component.java:3266)
at com.codename1.ui.Display.handleEvent(Display.java:2025)
at com.codename1.ui.Display.edtLoopImpl(Display.java:1070)
at com.codename1.ui.Display.mainEDTLoop(Display.java:999)
at com.codename1.ui.RunnableWrapper.run(RunnableWrapper.java:120)
at com.codename1.impl.CodenameOneThread.run(CodenameOneThread.java:176)
java.io.IOException: Query does not return results
at com.codename1.impl.javase.SEDatabase.executeQuery(SEDatabase.java:176)
at com.pivotal.calendar.Calender$4.actionPerformed(Calender.java:211)
at com.codename1.ui.util.EventDispatcher.fireActionEvent(EventDispatcher.java:349)
at com.codename1.ui.Button.fireActionEvent(Button.java:435)
at com.codename1.ui.Button.released(Button.java:467)
at com.codename1.ui.Button.pointerReleased(Button.java:566)
at com.codename1.ui.Form.pointerReleased(Form.java:2642)
at com.codename1.ui.Form.pointerReleased(Form.java:2578)
at com.codename1.ui.Component.pointerReleased(Component.java:3266)
at com.codename1.ui.Display.handleEvent(Display.java:2025)
at com.codename1.ui.Display.edtLoopImpl(Display.java:1070)
at com.codename1.ui.Display.mainEDTLoop(Display.java:999)
at com.codename1.ui.RunnableWrapper.run(RunnableWrapper.java:120)
at com.codename1.impl.CodenameOneThread.run(CodenameOneThread.java:176)
'db.executeQuery'は、結果を返さないクエリ用に設計されていないようです。それが例外をスローする理由です –