Question

我设置了代码，以便用户可以输入Microsoft Access文件的名称，然后成功创建文件。但是，我想使用JFileChooser使过程更顺畅，但是当我使用它时，我的代码不起作用。

这是我的（工作）以前的代码，其中包含一些不相关的代码 -

try {

    fileName = JOptionPane.showInputDialog(null,"Enter file name ");
   String dbPath = "C:/Users/Evan/Documents/"+fileName+".accdb";

       System.out.println(dbPath);
       // outputs C:/Users/Evan/Documents/fileName.accdb
try (Connection conn = DriverManager.getConnection(

    "jdbc:ucanaccess://" + dbPath  
 +   ";newdatabaseversion=V2010"
)) {
 DatabaseMetaData dmd = conn.getMetaData();
    try (ResultSet rs = dmd.getTables(null, null, "Database", new String[] { "TABLE" })) {

        try (Statement s = conn.createStatement()) {
            s.executeUpdate("CREATE TABLE " + "Database " 
+" (Row COUNTER PRIMARY KEY, A DOUBLE , B DOUBLE)");
            System.out.println("File " + fileName + " created.");
            valueProperty.setValue(fileName);
        }

}
conn.close();

 }

}
 catch (Exception f){
  f.printStackTrace();
 }
       }

以下是我现在的代码，输出错误

net.ucanaccess.jdbc.UcanaccessSQLException：UCAExc ::: 4.0.2空数据库文件

并生成一个不包含错误消息的文件＆＃34;无法识别的数据库格式＆＃34;以及文件的名称和路径，尽管文件的路径与除文件名之外的其他工作文件相同：

try {

    JFileChooser chooser = new JFileChooser();
   chooser.setCurrentDirectory(new File("/home/me/Documents"));
int retrieval = chooser.showSaveDialog(null);
if (retrieval == JFileChooser.APPROVE_OPTION) {
   FileWriter fw = new FileWriter(chooser.getSelectedFile()+".accdb");


  path=chooser.getSelectedFile().getAbsolutePath()+".accdb";
 // System.out.println(path);
fileName=chooser.getSelectedFile().getName();

   String dbPath = path.replace("\\","/"); /* I know this looks weird, I
just did it because the output in the working version has it with / instead. 
I've tried it with both slashes and the result is the same. */   

   System.out.println(dbPath);
   // outputs C:/Users/Evan/Documents/fileName.accdb

/*where the code has an error */  try (Connection conn = DriverManager.getConnection(

    "jdbc:ucanaccess://" + dbPath  
 +   ";newdatabaseversion=V2010"
)) {
DatabaseMetaData dmd = conn.getMetaData();
    try (ResultSet rs = dmd.getTables(null, null, "Database", new String[] { 
"TABLE" })) {

        try (Statement s = conn.createStatement()) {
            s.executeUpdate("CREATE TABLE " + "Database" +" (Row COUNTER 
PRIMARY KEY, A DOUBLE , B DOUBLE)");
            System.out.println("File " + fileName + " created.");
            valueProperty.setValue(fileName);
        }

}
conn.close();

 }}
else 
    System.out.println("failed");
    return;

}
catch (Exception f){
  f.printStackTrace();
}

感谢任何人提供的任何帮助，谢谢

Answer 1

;newdatabaseversion=V2010将创建一个新文件 at all 。如果它存在但包含零字节，则它不是有效的Access数据库。跟踪代码以查看它是否正在创建零字节文件，如果是，则在尝试打开连接之前删除该文件。

使用JFileChooser进行UCanAccess：＆＃34;清空数据库文件＆＃34;

1 个答案: