CiscoVLAN、VLAN Trunk、VTP和STP配置(1)

package dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class BaseDao {
public static final String driver = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
public static final String url = "jdbc:sqlserver://127.0.0.1:1433;database=ebook";
public static final String uid = "sa";
public static final String pwd = "123456";

/**
* 创建连接对象
* @return
*/
public Connection getConnection(){
Connection connection = null;
try {
Class.forName(driver);
connection = DriverManager.getConnection(url,uid,pwd);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}
return connection;
}

/**
* 关闭全部连接
* @param connection
* @param statement
* @param result
*/
public void closeAll(Connection connection,PreparedStatement statement,ResultSet result){
if (result != null){
try {
result.close();
result = null;
} catch (SQLException e) {
e.printStackTrace();
}
}
if (statement != null){
try {
statement.close();
statement = null;
} catch (SQLException e) {
e.printStackTrace();
}
}
try {
if (connection != null && !(connection.isClosed())){
connection.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
}

/**
* 执行增、删、改操作
* @param sql
* @param param
* @return
*/
public int executeQuery(String sql,String[] param){
Connection connection = null;
PreparedStatement statement = null;
int num = 0;
try {
connection = this.getConnection();
statement = connection.prepareStatement(sql);
for (int i = 0 ; i < param.length ; i++){
statement.setString(i+1, param[i]);
}
num = statement.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
} finally {
this.closeAll(connection, statement, null);
}
return num;
}
}