我试图从一个名为“登录”的表从名为“ creds”的数据库返回数据。我可以连接到数据库，但是由于某种原因，找不到该表。
我尝试重新创建数据库/将其移至src文件夹中，但没有任何作用。
这是Java项目Project
Connection.java：
import java.sql.*;
import java.sql.DriverManager;
public class Connection {
private static final String USERNAME = "dbuser";
private static final String PASSWORD = "dppassword";
private static final String CONN = "jdbc:sqlite:creds.sqlite";
public static java.sql.Connection getConnection() throws SQLException {
try {
Class.forName("org.sqlite.JDBC");
return DriverManager.getConnection(CONN);
}
catch(Exception e) {
e.printStackTrace();
}
return null;
}
}
Model.java：
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
public class Model {
Connection connection;
public Model() {
try {
this.connection = db.Connection.getConnection();
}
catch(Exception e) {
}
if(connection == null) {
System.exit(1);
}
}
public boolean isDBConnected() {
return this.connection !=null;
}
public boolean isLogin(String user, String pass) throws Exception{
PreparedStatement pr = null;
ResultSet rs = null;
String SQL = "SELECT * FROM login where username = ? and password = ?";
try{
pr = this.connection.prepareStatement(SQL);
pr.setString(1, user);
pr.setString(2, pass);
rs = pr.executeQuery();
boolean boo;
if(rs.next()) {
return true;
}
else {
return false;
}
}
catch(Exception e) {
e.printStackTrace();
return false;
}
finally {
pr.close();
rs.close();
}
}
}
LogController.java
package login;
import java.net.URL;
import java.util.ResourceBundle;
import javafx.event.ActionEvent;
import javafx.fxml.FXML;
import javafx.fxml.FXMLLoader;
import javafx.fxml.Initializable;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.Pane;
import javafx.stage.Stage;
public class LogController implements Initializable{
Model loginModel = new Model();
@FXML
private TextField pass;
@FXML
private Label lbl;
@FXML
private TextField user;
@FXML
void log(ActionEvent event) {
try {
if(this.loginModel.isLogin(user.getText(), pass.getText())) {
System.out.print("yay");
}
}
catch(Exception e) {
}
}
public void initialize(URL url, ResourceBundle rb ) {
if(this.loginModel.isDBConnected()) {
lbl.setVisible(true);
lbl.setText("Connected");
}
else {
lbl.setVisible(true);
lbl.setText("Not Connected");
}
}
public void nextMain() {
try {
Stage next = new Stage();
FXMLLoader ld = new FXMLLoader();
//Pane root = (Pane)ld.load(getClass().getResource("/Main/umain.fxml"));
//will be next class
}
catch(Exception e) {
e.printStackTrace();
}
}
}
此图像中的“已连接”一词表明它已按照上述代码进行连接。GUI login.java刚启动了GUI
我在输出时收到的错误是：
org.sqlite.SQLiteException: [SQLITE_ERROR] SQL error or missing database (no such table: login)
at org.sqlite.core.DB.newSQLException(DB.java:941)
at org.sqlite.core.DB.newSQLException(DB.java:953)
at org.sqlite.core.DB.throwex(DB.java:918)
at org.sqlite.core.NativeDB.prepare_utf8(Native Method)
at org.sqlite.core.NativeDB.prepare(NativeDB.java:134)
at org.sqlite.core.DB.prepare(DB.java:257)
at org.sqlite.core.CorePreparedStatement.<init>(CorePreparedStatement.java:47)
at org.sqlite.jdbc3.JDBC3PreparedStatement.<init>(JDBC3PreparedStatement.java:30)
at org.sqlite.jdbc4.JDBC4PreparedStatement.<init>(JDBC4PreparedStatement.java:19)
at org.sqlite.jdbc4.JDBC4Connection.prepareStatement(JDBC4Connection.java:35)
at org.sqlite.jdbc3.JDBC3Connection.prepareStatement(JDBC3Connection.java:241)
at org.sqlite.jdbc3.JDBC3Connection.prepareStatement(JDBC3Connection.java:205)
at login.Model.isLogin(Model.java:32)
at login.LogController.log(LogController.java:31)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.reflect.misc.Trampoline.invoke(Unknown Source)
at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at sun.reflect.misc.MethodUtil.invoke(Unknown Source)
at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java:1769)
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java:1657)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Node.fireEvent(Node.java:8413)
at javafx.scene.control.Button.fire(Button.java:185)
at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:182)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:96)
at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java:89)
at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
at javafx.event.Event.fireEvent(Event.java:198)
at javafx.scene.Scene$MouseHandler.process(Scene.java:3757)
at javafx.scene.Scene$MouseHandler.access$1500(Scene.java:3485)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1762)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2494)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:381)
at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:295)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354(GlassViewEventHandler.java:417)
at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:389)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:416)
at com.sun.glass.ui.View.handleMouseEvent(View.java:555)
at com.sun.glass.ui.View.notifyMouse(View.java:937)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
at java.lang.Thread.run(Unknown Source)
最后是cred.db文件的mysqlite数据库工具的屏幕截图： "login" table
如果有人对我为什么看不到桌子上的任何东西有任何想法，请告诉我！
