求 java java.sql.SQLException:The Network Adapter could not establish the connection我写了一个链接 oracle 的servlet 小程序,报的上面的错 ,然后我再写个测试的 JDBC 程序,都能通过 ,能打印出数据库中的内容,测试

java java java.sql.time java.sql.date 二者如何组合成一个java.util.date java.sql.Date与java.util.Date的区别 import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.sql.*; public class a java如何获取当前时间 年月日 时分秒并且转成java.sql.Date格式.谢谢你们 import=java.sql.*和import=java.util.* 有什么区别? java.sql.date的时分秒去哪里了? java.sql.date的时分秒去哪里了? java.sql.SQLException: Illegal operation on empty result set.import java.sql.Connection;import java.sql.ResultSet;import java.sql.Statement;public class shujuku { public static void main(String args[]) { Connection conn; conn = Conn java.sql.SQLException:Operation not allowed after ResultSet closed at com.mysql.jdbc.ResultSet.ch创建表格后,增删查改中增实现不了,报错、、、求指导java.sql.SQLException:Operation not allowed after ResultSet closed代码：private java 中import java.sql.Connection 报错：The import java.sql.Connection conflicts with a type defined in the same file import java.io.IOException;import java.io.OutputStream;import java.net.Socket;import java.net.UnknownHostException;import java.sql.ResultSet;import org.sql.IntoDB;public class BaiduReferer {public static void main(String[] args) throws UnknownHostExc SQL >select count(*) from Teacher where teacherCode=? and teacherPassword=? java.sql.SQLException:SQL >select count(*) from Teacher where teacherCode=? and teacherPassword=?java.sql.SQLException: Can not issue executeUpdate() for SELECTsat com.mysql. java 中 JAVA.百钱买鸡. java static java.sql.SQLException:Parameter index out of range (0 < 1 ).at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1074)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:988)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:9