jdbc-db2 - 提取完整记录[重复]

Posted 2021-04-15

这个问题在这里已有答案：

• How do I iterate through the values of a row from a result set in java? 4个答案

我试图从DB2表中提取数据。我想知道是否有一种方法可以从ResultSet打印整个记录，而无需指定单个列名。

我的代码：

import java.sql.*;

            public class Ftp {
                public static void main(String[] args) {
                    String url = "jdbc:db2://mvshost:4456/SQA_SYSTEM";
                    String user = "xxxxx";
                    String password = "yyyyyy";
                    Connection con;
                    PreparedStatement stmt;
                    ResultSet rs;
                    try {
                        Class.forName("com.ibm.db2.jcc.DB2Driver");
                        con = DriverManager.getConnection(url, user, password);
                        con.setAutoCommit(false);
                        stmt = con.prepareStatement("SELECT EMP FROM IDATDMK.GREEN");
                        rs = stmt.executeQuery();
                        while (rs.next()) {
                            String EMP = rs.getString("EMP");
                            System.out.println("EMP from DB2 = " + EMP);                    
                        }
                        rs.close();
                        stmt.close();
                        con.commit();
                        con.close();

                    }
                    catch (Exception e) {
                      System.out.println("Exception: " + e);
                      }
                    }
                }
            }

如果我将查询编写为Select * from IDATDMK.GREEN，如何在while循环中打印整个记录而不指定单个列名。我在表格中有80多列。

答案

ResultSetMetaData rsmd = rs.getMetaData();
int columnsNumber = rsmd.getColumnCount();

while(rs.next(){
for (int i = 1; i <= columnsNumber; i++) {
       if (i > 1) System.out.print("
");
       String columnValue = rs.getString(i);
       System.out.print(columnValue) }}