在其他笔记本电脑/PC 上安装基于 JAVAFX 的应用程序后创建 SQLite 数据库的问题 [重复]

Question

如果不存在需要创建一个DB然后保存表。代码中显示的函数 getConnection()。实施的方案如下： SAVE按钮事件调用btnsave()->insertrecord()->executequery()->getConnection()

我通过以下方式测试应用程序：

1. 在 PC1 上安装的 eclipse 内部 --> 运行良好。创建数据库并成功删除表条目。

2. Create the runnable Jar and copy to other laptop PC2 --.与情况 1 一样运作良好。

3. Inno setup 安装在 PC2 上。因此，使用 INNO 来制作安装程序。安装 n PC2。似乎没有创建数据。如果创建了，不知道会在系统的什么地方创建？如何以编程方式读取数据库路径？

      @FXML
       private void btnsave(ActionEvent event) throws Exception{        
      insertrecord();
      System.out.println("New Patient Inserted");       
    }
   
    private void insertrecord() throws Exception
     {
         try{
         String query ="INSERT INTO `newpatient`(patientId,patientName,patientAge,patientGender,patientAddress,patientMobile)"+
            "VALUES("+ newpatient_id.getText() +",'" +  newpatient_name.getText() + "','"+  newpatient_age.getText() + "',"
                    + "'"+  selectedGender  + "','"+  newpatient_address.getText() + "',"+  newpatient_mobile.getText() +")";             
          executeQuery(query);
          System.out.println("Saved");
         }
         catch(Exception e) {
          //System.out.println("Execption in Save");
          e.printStackTrace();            
          }
         }
   
           private void executeQuery(String query) {
   
     Connection  conn= getConnection();
     Statement st;
     try {
            st = conn.createStatement();
            st.executeUpdate(query);         
        }catch(Exception e){
          e.printStackTrace(); 
       }
      }
   
   
       public static Connection getConnection() {       
        Connection conn = null;
   
         try{           
   
                Class.forName("org.sqlite.JDBC");
                conn = DriverManager.getConnection("jdbc:sqlite:patientdata","root","");
                System.out.println("data base connection established:  "+ conn.toString());
   
                Statement stmt = null;
                stmt = conn.createStatement();
                String pat = "CREATE TABLE if not exists newpatient " +
                               "(patientId INTEGER NOT NULL," +
                               " patientName    CHAR(50)    NOT NULL, " + 
                               " patientAge     INTEGER     NOT NULL, " + 
                               "patientGender   CHAR(10) NOT NULL,"+
                               "patientAddress  CHAR(100) NOT NULL,"+
                               "patientMobile   BIGINT(10) NOT NULL)";
                System.out.println("newpatient Table Created:  ");
                stmt.executeUpdate(pat);
                stmt.close();
   
                stmt = conn.createStatement();
                String hist = "CREATE TABLE if not exists history " +
                                   "(id INTEGER NOT NULL," +
                                   " date    DATE    NOT NULL, " + 
                                   " start   TIME     NOT NULL, " +                                               
                                   "stop   TIME NOT NULL)";
                System.out.println("history Table Created:  ");    
                stmt.executeUpdate(hist);
                stmt.close();
                return conn
               }
   

Answer 1

我有一个误解，认为 jdbc:sqlite: 会自动在安装应用程序的同一文件夹中创建数据库文件。但是，该文件夹在安装任何应用程序的地方都被写保护。以下对我有用：

public static Connection getConnection() {      
    Connection conn = null;

        try{        
            
                File theDir = new File( "c://spm_database");
                if (!theDir.exists()){
                    theDir.mkdirs();
                }
                System.out.println(theDir.toString());
                String dbpath = theDir.toString()+"/patientdata.db";
                System.out.println("Current absolute dbpath is: " + dbpath);
                
                Class.forName("org.sqlite.JDBC");
                conn = DriverManager.getConnection("jdbc:sqlite:"+dbpath);
                System.out.println("data base connection established:  "+ conn.toString());
               // extra code .....
           }
           catch(Exception e){
            }
           retrun conn
         }