如何使用JDBC连接来检索一个表的内容是什么？

解决方法

下面的示例使用getString,getInt & executeQuery方法来获取和显示表的内容。

import java.sql.*;

public class jdbcResultSet {
   public static void main(String[] args) {
      try {
         Class.forName("org.apache.derby.jdbc.ClientDriver");
      }
      catch(ClassNotFoundException e) {
         System.out.println("Class not found "+ e);
      }
      try {
         Connection con = DriverManager.getConnection
         ("jdbc:derby://localhost:1527/testDb","username",
         "password");
         Statement stmt = con.createStatement();
         ResultSet rs = stmt.executeQuery
         ("SELECT * FROM employee");
         System.out.println("id  name    job");
         while (rs.next()) {
            int id = rs.getInt("id");
            String name = rs.getString("name");
            String job = rs.getString("job");
            System.out.println(id+"   "+name+"    "+job);
         }
      }
      catch(SQLException e){
         System.out.println("SQL exception occured" + e);
      }
   }
}

结果

上面的代码示例将产生以下结果。该结果可能会不同。

id  name   job
1   alok   trainee
2   ravi   trainee