如何显示表的内容?(How to display contents of table ?)

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小牛编辑
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2023-12-01

问题描述 (Problem Description)

如何使用JDBC连接检索表的内容?

解决方案 (Solution)

下面的示例使用getString,getInt和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 (Result)

上面的代码示例将产生以下结果。 结果可能会有所不同。

id  name   job
1   alok   trainee
2   ravi   trainee