[JDBC]查询结果集把字段名和字段值一起竖向输出

代码:

package com.hy.fieldandvalue;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.apache.log4j.Logger;

import com.hy.DBParam;

class DbParam{
    public final static String Driver = "oracle.jdbc.driver.OracleDriver";
    public final static String DbUrl = "jdbc:oracle:thin:@127.0.0.1:1521:orcl";
    public final static String User = "ufo";
    public final static String Pswd = "1234";
}

class KeyValue implements Comparable<KeyValue>{
    String key;
    Object value;
    
    @Override
    public int compareTo(KeyValue another) {
        return this.key.compareTo(another.key);
    }
}
public class Fetcher {
    private static Logger log = Logger.getLogger(Fetcher.class);
    
    public static void main(String[] args) {
        Connection conn = null;
        Statement stmt = null;
        
        try{
            Class.forName(DBParam.Driver).newInstance();
            conn = DriverManager.getConnection(DBParam.DbUrl, DBParam.User, DBParam.Pswd);
            stmt = conn.createStatement();
            
            //String sql = "select * from allocation_request where shipper_code='10005' and order_no='1911271000500004' and to_char(delivery_date,'yyyy-MM-dd')='2019-11-28'";
            String sql="select * from testtb17 where id=114 ";
            
            ResultSet rs = stmt.executeQuery(sql);
            ResultSetMetaData rsMetadata = rs.getMetaData();
            int count = rsMetadata.getColumnCount();
            
            
            int index = 0;
            while (rs.next()) {
                index++;
                List<KeyValue> kvList=new ArrayList<KeyValue>();
                
                for (int i=0; i<count; i++) {
                    int idx=i+1;
                    
                    KeyValue kv=new KeyValue();
                    kv.key = rsMetadata.getColumnLabel(idx);// 列名
                    kv.value=rs.getString(kv.key);
                    kvList.add(kv);
                }
                
                Collections.sort(kvList);
                
                System.out.println();
                StringBuilder sb=new StringBuilder();
                int idx=0;
                for(KeyValue kv:kvList) {
                    idx++;
                    sb.append(fixSizeStr("#"+idx,4)+fixSizeStr(kv.key,30)+kv.value+"
");
                }
                
                System.out.println(sb.toString());
            }
        } catch (Exception e) {
            System.out.print(e.getMessage());
            e.printStackTrace();
        } finally {
            try {
                stmt.close();
                conn.close();
            } catch (SQLException e) {
                log.error("Can't close stmt/conn because of " + e.getMessage());
            }
        }
    }
    
    /**
     * get a fix-length string,if less add space
     * @param str
     * @param size
     * @return
     */
    private static String fixSizeStr(String str, int size) {
        return String.format("%-"+size+"s", str);
    }
}

输出：

#1  AGE                           0
#2  CREATEDTIME                   2019-06-16 10:21:46
#3  ID                            114
#4  NAME                          0

--END-- 2019年12月4日20:26:01