java - 将txt文件中的数据存储在mysql表中

Question

我正在尝试编写一个程序，从 txt 文件中读取数据并将它们存储在表中。用户将给出文件的目录，然后创建具有特定字段的表。

然后我必须用每个表所拥有的数据填充它。有谁可以帮助我如何做到这一点？ .txt 文件包含如图所示的数据:
两列由制表符分隔。我尝试了下面的代码，但出现错误:

java.sql.SQLException:at part1.importData(part1.java:31)
    at part1.main(part1.java:16)

我尝试过的代码是:

public class notepad {

    public static void main(String args[]) throws Exception {

        Class.forName("com.mysql.jdbc.Driver");
        Connection con = (Connection) DriverManager.getConnection(
                "jdbc:mysql://localhost:3300/mydb", "root", "root");

        String dirpath = "";
        Scanner scanner1 = new Scanner(System.in);
        while (true) {
            System.out.println("Please give the directory:");
            dirpath = scanner1.nextLine();
            File fl = new File(dirpath);
            if (fl.canRead())

                break;
            System.out.println("Error:Directory does not exists");
        }

        try {
            String files;
            File folder = new File(dirpath);
            File[] listOfFiles = folder.listFiles();

            for (int i = 0; i < listOfFiles.length; i++) {
                if (listOfFiles[i].isFile()) {
                    files = listOfFiles[i].getName();
                    if (files.endsWith(".txt") || files.endsWith(".TXT")) {
                        List<File> txtFiles = new ArrayList<File>();
                        txtFiles.add(listOfFiles[i]);
                        String[] parts = files.split("\\.");
                        String tablename = parts[0];
                        for (File txtFile : txtFiles) {
                            List sheetData = new ArrayList();

                            try {
                                FileReader in = new FileReader(txtFile);
                                BufferedReader br = new BufferedReader(in);
                                String line = br.readLine();
                                while (line != null) {
                                    System.out.println(line);
                                    line = br.readLine();
                                }
                                in.close();

                            } catch (Exception e) {
                                System.err.println("Error: " + e.getMessage());
                            }
                            showExcelData(sheetData);
                            getCreateTable1(con, tablename);
                            importData(con, txtFile);
                        }
                    }
                }
            }

        } catch (Exception e) {
            System.out.println();
        }
    }

    private static String getCreateTable1(Connection con, String tablename) {

        try {
            Class.forName("com.mysql.jdbc.Driver");
            Statement stmt = con.createStatement();
            String createtable = "CREATE TABLE "
                    + tablename
                    + " ( text VARCHAR(255), price int )";
            System.out.println("Create a new table in the database");
            stmt.executeUpdate(createtable);
        } catch (Exception e) {
            System.out.println(((SQLException) e).getSQLState());
            System.out.println(e.getMessage());
            e.printStackTrace();
        }

        return null;
    }

    private static void importData(Connection con, File txtFile) {

        Statement stmt;
        String query;
        try {
            stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,
                    ResultSet.CONCUR_UPDATABLE);

            query = "LOAD DATA INFILE '" + txtFile
                    + "' INTO TABLE tablename (text,price);";

            stmt.executeUpdate(query);

        } catch (Exception e) {
            e.printStackTrace();
            stmt = null;
        }

    }

有人可以帮我吗？我的困难是当我尝试导入数据时。

Answer 1

问题是您尝试将 File 传递给查询，而 AFAIK 它应该是文件的完整路径，例如:

'C:\temp\data1.txt'

所以在这个函数中你应该使用:

 private static void importData(Connection con, File txtFile) {

        query = "LOAD DATA INFILE '" + txtFile.getAbsolutePath()
                + "' INTO TABLE tablename (text,price);";

，请注意，这只有在本地主机上才有效，对于远程服务器，最好在批量插入中执行此操作，这意味着您需要重写整个代码。