如何将.jar文件中的数据加载到Mysql表中？

Question

I want to load data from .txt file (which is in project folder) to mySQL table.

String path = getClass().getResource("/DataEmployees.txt").getPath();
String query = "LOAD DATA LOCAL INFILE ? INTO TABLE employees LINES TERMINATED BY '\r\n' STARTING BY 'xxx';";
try( Connection connection = Main.dataSource.getConnection() ){
    try( PreparedStatement preparedStatement = connection.prepareStatement(query) ){
        preparedStatement.setString(1, path);
        preparedStatement.executeUpdate();
    }
}catch(Exception exception){
    ExceptionDialog exceptionDialog = new ExceptionDialog("Couldn't load default sample data",exception);
    exceptionDialog.showAndWait();
};

But I get an error:

java.sql.SQLException: Unable to open file '/C:/Users/Tomek/EclipseWorkspace/Pizza%20Service/bin/DataEmployees.txt'for 'LOAD DATA LOCAL INFILE' command.Due to underlying IOException: 

** BEGIN NESTED EXCEPTION ** 

java.io.FileNotFoundException
MESSAGE: C:\Users\Tomek\EclipseWorkspace\Pizza%20Service\bin\DataEmployees.txt (The system cannot find the path specified)

STACKTRACE:

java.io.FileNotFoundException: C:\Users\Tomek\EclipseWorkspace\Pizza%20Service\bin\DataEmployees.txt (The system cannot find the path specified)
    at java.io.FileInputStream.open0(Native Method)
    at java.io.FileInputStream.open(Unknown Source)
    at java.io.FileInputStream.<init>(Unknown Source)
    at java.io.FileInputStream.<init>(Unknown Source)
    at com.mysql.jdbc.MysqlIO.sendFileToServer(MysqlIO.java:3674)
    at com.mysql.jdbc.MysqlIO.readResultsForQueryOrUpdate(MysqlIO.java:2995)
    at com.mysql.jdbc.MysqlIO.readAllResults(MysqlIO.java:2245)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2638)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2535)
    at 

DataEmployees is in another source folder.

I don't know what is wrong here and how can I fix it. It works when I use absolute path: String path = "C:/Users/Tomek/EclipseWorkspace/Pizza Service/files/DataEmployees.txt";

EDIT

String path="";
try {
    path = getClass().getResource("/DataEmployees.txt").toURI().getPath();
} catch (URISyntaxException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}
String query = "LOAD DATA LOCAL INFILE ? INTO TABLE employees LINES TERMINATED BY '\r\n' STARTING BY 'xxx';";

this works but within the eclipse. If I export jar file to desktop then I get exception:

java.sql.SQLException: Unable to open file 'null'for 'LOAD DATA LOCAL INFILE' command.Due to underlying IOException: 

** BEGIN NESTED EXCEPTION ** 

java.io.FileNotFoundException
MESSAGE: null (The system cannot find the file specified)

STACKTRACE:

java.io.FileNotFoundException: null (The system cannot find the file specified)

Answer 1

If you want to read that file from inside your jar use:

InputStream input = getClass().getResourceAsStream("/path/to/file");

The path starts with "/", but that is not the path in your file-system, but in your classpath (in-side jar). So if your file is called data.txt and is in files folder at the root of jar file you should use getResourceAsStream("/files/data.txt") to read it as stream.