Question

我正在创建一个程序，我从.txt文件中读取数据并将它们存储在表中。在我的程序中，用户将给出文件的目录，程序将找到所有.txt文件，并且对于这些文件中的每一个都将创建一个表，该表将具有文件名称的名称，并且每个表将具有两个字段（文字和价格）。

这两列由空格分隔。在我的代码中显示了所有程序。但是当我尝试以编程方式导入数据时，我遇到了问题。我得到的错误异常是我在SQL语法中有错误。任何人都可以帮助我，因为我试图解决它几天没有结果？

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:3330/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();
                                    String filename = dirpath.substring(dirpath
                                            .indexOf('\\') - 2, files
                                            .indexOf(parts[0]));
                                }
                                in.close();

                            } catch (Exception e) {
                                System.err.println("Error: " + e.getMessage());
                            }

                            getCreateTable1(con, tablename);
                            importData(con, txtFile, tablename);
                        }
                    }
                }
            }

        } 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 String importData(Connection con, File txtFile,
            String tablename) {

        try {
            Statement stmt;

            stmt = con.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,
                    ResultSet.CONCUR_UPDATABLE);

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

            stmt.executeUpdate(importingdata);

        } catch (Exception e) {
            System.out.println(((SQLException) e).getSQLState());
            System.out.println(e.getMessage());
            e.printStackTrace();

        }
        return null;
    }
}

Answer 1

尝试更改

+ txtFile.getAbsolutePath() + "' INTO TABLE '" + tablename
                                            ^

到

+ txtFile.getAbsolutePath() + "' INTO TABLE " + tablename

此孤立报价会使您的对帐单无效。

导入表中的数据错误异常在mysql中

1 个答案: