javajdbcmysql导出数据库文件

import java.io.FileWriter;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class JdbcExportToCSV {
    public static void main(String[] args) {
        String url = "jdbc:mysql://localhost:3306/mydatabase";
        String user = "username";
        String password = "password";
        String tableName = "mytable";
        String csvFilePath = "mytable.csv";

        try (Connection conn = DriverManager.getConnection(url, user, password);
             Statement stmt = conn.createStatement();
             ResultSet rs = stmt.executeQuery("SELECT * FROM " + tableName)) {

            FileWriter fileWriter = new FileWriter(csvFilePath);
            int columnCount = rs.getMetaData().getColumnCount();

            // 写入列名
            for (int i = 1; i <= columnCount; i++) {
                fileWriter.append(rs.getMetaData().getColumnName(i));
                if (i < columnCount) {
                    fileWriter.append(",");
                }
            }
            fileWriter.append("\n");

            // 写入数据
            while (rs.next()) {
                for (int i = 1; i <= columnCount; i++) {
                    fileWriter.append(rs.getString(i));
                    if (i < columnCount) {
                        fileWriter.append(",");
                    }
                }
                fileWriter.append("\n");
            }

            fileWriter.flush();
            fileWriter.close();

            System.out.println("Data exported to " + csvFilePath);

        } catch (SQLException | IOException e) {
            e.printStackTrace();
        }
    }
}