Java类——JDBC链接、并操作MySQL数据库

Java——MySQL数据库操作类

 package pkg.src.database;
 
 import java.sql.*;
 
 public class MYSQL_DBManager {
 
     //
     //定义数据库相关的变量
     static String Drivername="com.mysql.jdbc.Driver";
     static String IP="localhost";
     static String Port="3306";
     static String DataBaseName="world";
     static String UserName="root";
     static String Password="123456";
 
     //定义数据库操作需要的成员变量
     private static Connection conn=null;
     private static Statement stmt=null;
     private static PreparedStatement prstmt=null;
     private static ResultSet rst=null;
     private ResultSetMetaData rsmt=null;
     public String setIP(String sIP){
         IP=sIP;
         return IP;
     }
     public String setUsername(String userName){
         UserName=userName;
         return UserName;
     }
     public String setPassword(String passwordS){
         Password=passwordS;
         return Password;
     }
 
     private static String URL="jdbc:mysql://"+IP+"/"+Port+"/"+DataBaseName+"?"
     +"user="+UserName+"&"+"password="+Password+"&userUnicode=true&characterEncoding=UTF-8";
 
     public static void getConnection(){
         //连接到数据库
         //加载驱动
         try {
             //动态加载jdbc驱动
             Class.forName(Drivername);
             //or: com.mysql.jdbc.Driver driver=new com.mysql.jdbc.Driver();
             //or: new com.mysql.jdbc.Driver();
             System.out.println("Load Driver success.");
             //conn代表一个数据库链接
             conn=DriverManager.getConnection(URL);
             System.out.println("conn创建成功！");
             stmt=conn.createStatement();
         } catch (ClassNotFoundException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         } catch (SQLException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
     }
     //执行数据库的查询操作，返回查询得到的数据集rst
     public static ResultSet executeQuery(String SQLCommand){
         try {
             rst=stmt.executeQuery(SQLCommand);
         } catch (SQLException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         return rst;
     }
     //执行数据库的更新操作,包括删除操作和修改操作
     public static void executeUpdate(String SQLCommand){
         try {
             stmt.executeUpdate(SQLCommand);
         } catch (SQLException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
     }
     //数据库当前的连接状态是什么样
     public void isConnected(){
         try {
             if(conn.isClosed()){
                 System.out.println("database connection is still openning.");
             }else{
                 System.out.println("database connection is closed.");
             }
         } catch (SQLException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
     }
     //关闭数据库链接
     private void ShutdonwConnection(){
         try {
             conn.close();
         } catch (SQLException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         try {
             stmt.close();
         } catch (SQLException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         try {
             prstmt.close();
         } catch (SQLException e) {
             // TODO Auto-generated catch block
             e.printStackTrace();
         }
         rst=null;
         rsmt=null;
     }
     //把数据库查询结果加载到JTable中
     public javax.swing.JTable loadRstToJTable(){
     }
 }