如何在java JDBC中获取具有列名/标题的数据[重复]

Question

以下是使用 JDBC 从 DB 获取数据的 Java 代码。但是，我也想要列名，但它只是附加数据。我不确定如何实现这一点。

import java.io.FileReader;
import java.io.FileWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSetMetaData;
import java.sql.Statement;
import java.sql.ResultSet;
import java.util.Properties;
public class DbToCSV {


    public static void main(String[] args) {


        try {

            FileReader reader=new FileReader("some.properties");  
            Properties properties=new Properties();  
            properties.load(reader);  
            String filename =properties.getProperty("filepath");
            FileWriter filewrite = new FileWriter(filename);
            Class.forName(properties.getProperty("jdbc.driver")).newInstance();
            Connection connection = DriverManager.getConnection
                    (properties.getProperty("jdbc.url"),
                    properties.getProperty("jdbc.username"),
                    properties.getProperty("jdbc.password"));

            String query = properties.getProperty("jdbc.query");

            Statement stmt = connection.createStatement();
            ResultSet resultSet = stmt.executeQuery(query);
            ResultSetMetaData rsmd = resultSet.getMetaData();
            int columnCount = rsmd.getColumnCount();


            while (resultSet.next()) {
                for(int i=2; i<=columnCount;i++){

                    filewrite.append(resultSet.getString(i));
                    filewrite.append(',');
                }
                filewrite.append('\n');
               }
            filewrite.flush();
            filewrite.close();
            connection.close();
            System.out.println("CSV File is Generated successfully.");



        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

请任何人解释一下如何在 CSV 中使用列标题？

Answer 1

您可以从ResultSet 元数据中获取此信息。

ResultSetMetaData rsmd = rs.getMetaData();

String name = rsmd.getColumnName(1);