使用java将SQLPLUS查询输出为*.csv格式

import java.io.FileWriter;
import java.io.IOException;
import java.sql.*;

public class SQLToCSV {
    public static void main(String[] args) {
        String jdbcUrl = "jdbc:mysql://localhost:3306/mydatabase";
        String username = "root";
        String password = "password";
        String sqlQuery = "SELECT * FROM mytable";
        String csvFilePath = "output.csv";

        try {
            // 连接数据库
            Connection connection = DriverManager.getConnection(jdbcUrl, username, password);

            // 执行查询
            PreparedStatement statement = connection.prepareStatement(sqlQuery);
            ResultSet resultSet = statement.executeQuery();

            // 创建CSV文件
            FileWriter writer = new FileWriter(csvFilePath);

            // 写入CSV数据
            ResultSetMetaData metaData = resultSet.getMetaData();
            int columnCount = metaData.getColumnCount();
            for (int i = 1; i <= columnCount; i++) {
                writer.append(metaData.getColumnName(i));
                if (i < columnCount) {
                    writer.append(",");
                } else {
                    writer.append("\n");
                }
            }

            while (resultSet.next()) {
                for (int i = 1; i <= columnCount; i++) {
                    writer.append(resultSet.getString(i));
                    if (i < columnCount) {
                        writer.append(",");
                    } else {
                        writer.append("\n");
                    }
                }
            }

            // 关闭资源
            writer.flush();
            writer.close();
            resultSet.close();
            statement.close();
            connection.close();

            System.out.println("CSV文件生成成功！");
        } catch (SQLException | IOException e) {
            e.printStackTrace();
        }
    }
}