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yanghui

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2014-11-17 11:21:29 | [全部帖] [楼主帖]

楼主

//表已经建好了。
//conn = DriverManager.getConnection(url,user,passwordofDB); 这句总是出现Connection不能转换为Connection。
//望高手指点，谢谢！
import java.sql.*;
import com.mysql.jdbc.Connection;
import com.mysql.jdbc.ResultSet;
import com.mysql.jdbc.*;
import com.mysql.jdbc.Statement;
import com.mysql.jdbc.jdbc2.optional.MysqlXid;
public class JdbcDome {
      public static void main(String[] args) {
            try{
                  // Class.forName("org.git.mm.mysql.Driver");
                  // java.sql.DriverManager.registerDriver(new org.git.mm.mysql.Driver());
                  Class.forName("com.mysql.jdbc.Driver");
            }
            catch(java.lang.ClassNotFoundException e)
            {
                  System.out.println("Class Not Found Exception occur.Message is:");
                  System.out.println(e.getMessage());
            }
            try{
                  Statement stmt;
                  ResultSet rs;
                  String url="jdbc:mysql://localhost;8080/test";
                  String user= "root";
                  String passwordofDB= "kaka19860205";
                  Connection conn=null;
                  try{
                        conn = DriverManager.getConnection(url,user,passwordofDB);
                  }
                  catch(Exception e)
                  {
                        e.printStackTrace();
                  }
                  stmt=(Statement) conn.createStatement();
                  rs=(ResultSet) stmt.executeQuery("select *from userinfo");
                  while(rs.next())
                  {
                        int id=rs.getInt(1);
                        String name=rs.getString(2);
                        String password=rs.getString(3);
                        int age=rs.getInt(4);
                        String gender=rs.getString(5);
                        String email=rs.getString(6);
                        System.out.println("id"+id);
                        System.out.println("name"+name);
                        System.out.println("password"+password);
                        System.out.println("age"+age);
                        System.out.println("gender"+gender);
                        System.out.println("email"+email);
                  }
                  rs.close();
                  stmt.close();
                  conn.close();
                  catch(SQLException e)
                  {
                        System.out.println("Class Not Found Exception occur.Message is:");
                        System.out.println(e.getMessage());
                  }
            }

php怎么获取js值
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求助啊（某双窗体程序编写）
各位大哥大姐帮忙看下这是怎么回事~
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SQL server2008 java jdbc 链接问题网上很多方法都试了大家来看下谢谢了

import com.mysql.jdbc.Connection;
import com.mysql.jdbc.ResultSet;
import com.mysql.jdbc.*;
import com.mysql.jdbc.Statement;

全部改成

java.sql.* 就行了

com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception:
** BEGIN NESTED EXCEPTION **
java.net.UnknownHostException
MESSAGE: localhost;8080
STACKTRACE:
java.net.UnknownHostException: localhost;8080
at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method)
at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:849)
at java.net.InetAddress.getAddressFromNameService(InetAddress.java:1200)
at java.net.InetAddress.getAllByName0(InetAddress.java:1153)
at java.net.InetAddress.getAllByName(InetAddress.java:1083)
at java.net.InetAddress.getAllByName(InetAddress.java:1019)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:246)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:271)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2744)
at com.mysql.jdbc.Connection.<init>(Connection.java:1553)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at JdbcDome.main(JdbcDome.java:30)
** END NESTED EXCEPTION **
Last packet sent to the server was 0 ms ago.
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2820)
at com.mysql.jdbc.Connection.<init>(Connection.java:1553)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at JdbcDome.main(JdbcDome.java:30)
Exception in thread "main" java.lang.NullPointerException
at JdbcDome.main(JdbcDome.java:39)
com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception:
** BEGIN NESTED EXCEPTION **
java.net.UnknownHostException
MESSAGE: localhost;8080
STACKTRACE:
java.net.UnknownHostException: localhost;8080
at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method)
at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:849)
at java.net.InetAddress.getAddressFromNameService(InetAddress.java:1200)
at java.net.InetAddress.getAllByName0(InetAddress.java:1153)
at java.net.InetAddress.getAllByName(InetAddress.java:1083)
at java.net.InetAddress.getAllByName(InetAddress.java:1019)
at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:246)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:271)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2744)
at com.mysql.jdbc.Connection.<init>(Connection.java:1553)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at JdbcDome.main(JdbcDome.java:30)
** END NESTED EXCEPTION **
Last packet sent to the server was 0 ms ago.
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2820)
at com.mysql.jdbc.Connection.<init>(Connection.java:1553)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at JdbcDome.main(JdbcDome.java:30)
Exception in thread "main" java.lang.NullPointerException
at JdbcDome.main(JdbcDome.java:39)

错误代码：：：：

com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception:
** BEGIN NESTED EXCEPTION **
com.mysql.jdbc.CommunicationsException
MESSAGE: Communications link failure due to underlying exception:
** BEGIN NESTED EXCEPTION **
java.io.EOFException
MESSAGE: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
STACKTRACE:
java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1997)
at com.mysql.jdbc.MysqlIO.readPacket(MysqlIO.java:573)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1044)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2748)
at com.mysql.jdbc.Connection.<init>(Connection.java:1553)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at JdbcDome.main(JdbcDome.java:30)
** END NESTED EXCEPTION **
Last packet sent to the server was 0 ms ago.
STACKTRACE:
com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception:
** BEGIN NESTED EXCEPTION **
java.io.EOFException
MESSAGE: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
STACKTRACE:
java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1997)
at com.mysql.jdbc.MysqlIO.readPacket(MysqlIO.java:573)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1044)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2748)
at com.mysql.jdbc.Connection.<init>(Connection.java:1553)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at JdbcDome.main(JdbcDome.java:30)
** END NESTED EXCEPTION **
Last packet sent to the server was 0 ms ago.
at com.mysql.jdbc.MysqlIO.readPacket(MysqlIO.java:641)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1044)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2748)
at com.mysql.jdbc.Connection.<init>(Connection.java:1553)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at JdbcDome.main(JdbcDome.java:30)
** END NESTED EXCEPTION **
Last packet sent to the server was 0 ms ago.
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2820)
at com.mysql.jdbc.Connection.<init>(Connection.java:1553)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:185)
at JdbcDome.main(JdbcDome.java:30)
Exception in thread "main" java.lang.NullPointerException
at JdbcDome.main(JdbcDome.java:39)
*/
import java.sql.*;
public class JdbcDome {
      public static void main(String[] args) {
            try{
                  // Class.forName("org.git.mm.mysql.Driver");
                  // java.sql.DriverManager.registerDriver(new org.git.mm.mysql.Driver());
                  Class.forName("com.mysql.jdbc.Driver");
            }
            catch(java.lang.ClassNotFoundException e)
            {
                  System.out.println("Class Not Found Exception occur.Message is:");
                  System.out.println(e.getMessage());
            }
            try{
                  Statement stmt;
                  ResultSet rs;
                  String url="jdbc:mysql://localhost:8080/test";
                  String user= "root";
                  String passwordofDB= "kaka19860205";
                  Connection conn=null;
                  try{
                        conn = DriverManager.getConnection(url,user,passwordofDB);
                  }
                  catch(Exception e)
                  {
                        e.printStackTrace();
                  }
                  stmt=(Statement) conn.createStatement();
                  rs=(ResultSet) stmt.executeQuery("select *from userinfo");
                  while(rs.next())
                  {
                        int id=rs.getInt(1);
                        String name=rs.getString(2);
                        String password=rs.getString(3);
                        int age=rs.getInt(4);
                        String gender=rs.getString(5);
                        String email=rs.getString(6);
                        System.out.println("id"+id);
                        System.out.println("name"+name);
                        System.out.println("password"+password);
                        System.out.println("age"+age);
                        System.out.println("gender"+gender);
                        System.out.println("email"+email);
                  }
                  rs.close();
                  stmt.close();
                  conn.close();
            }
            catch(SQLException e)
            {
                  System.out.println("Class Not Found Exception occur.Message is:");
                  System.out.println(e.getMessage());
            }
      }
}
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class Test {
      public static void main(String[] args) {
            Connection con = null;
            PreparedStatement ps = null;
            ResultSet rs = null;
            try {
                  con = ConnectionFactory.getConnection();
                  String sql = "SELECT id, name, password, age, gender, email " +
                  "FROM userinfo";
                  ps = con.prepareStatement(sql);
                  rs = ps.executeQuery();
                  while(rs.next()) {
                        System.out.println(" id = " + rs.getInt("id"));
                        System.out.println(" name = " + rs.getString("name"));
                        System.out.println("password = " + rs.getString("password"));
                        System.out.println(" age = " + rs.getInt("age"));
                        System.out.println(" gender = " + rs.getString("gender"));
                        System.out.println(" email = " + rs.getString("email"));
                        System.out.println();
                  }
            } catch (SQLException e) {
                  e.printStackTrace();
            } finally {
            if(rs != null) {
                  try {
                        rs.close();
                  } catch (SQLException e) {
                        e.printStackTrace();
                  }
            }
            if(ps != null) {
                  try {
                        ps.close();
                  } catch (SQLException e) {
                        e.printStackTrace();
                  }
            }
            if(con != null) {
                  try {
                        con.close();
                  } catch (SQLException e) {
                        e.printStackTrace();
                  }
            }
      }
}
}
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class ConnectionFactory {
      private final static String JDBC_DRIVER_CLASS = "com.mysql.jdbc.Driver";
      private final static String JDBC_URL = "jdbc:mysql://localhost:3306/test";
      private final static String DATABASE_USERNAME = "root";
      private final static String DATABASE_PASSWORD = "root";
      private ConnectionFactory() {
      }
      public static Connection getConnection() throws SQLException {
            Connection con = null;
            try {
                  Class.forName(JDBC_DRIVER_CLASS);
                  con = DriverManager.getConnection(
                  JDBC_URL, DATABASE_USERNAME, DATABASE_PASSWORD
                  );
            } catch (ClassNotFoundException e) {
                  e.printStackTrace();
            }
            return con;
      }
      "jdbc:mysql://localhost:3306/test";

当前这个test是？？？

--转自