Oracle連接數據庫封裝類

package com.jwgl.util;

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


/**
 * 封裝Oracle數據庫常用操作
 *
 * @author 劉鵬
 *
 */
public class DbUtil {
    /**
     * 取得Connection
     *
     * @return
     */
    public static final String DBDRIVER="oracle.jdbc.driver.OracleDriver";
    public static final String DBURL="jdbc:oracle:thin:@127.0.0.1:1521:orcl";
    public static final String DBUSER="kong";
    public static final String DBPASS="kong";


    public static Connection conn = null;
    public static Statement pstm = null;
    public static PreparedStatement pstmt = null;
    public static ResultSet rs = null;


    /**
     * 取得數據庫連接
     * @return
     */
    public static Connection getConnection(){


        try{
            Class.forName(DBDRIVER);

        }catch(ClassNotFoundException e){
            e.printStackTrace();
        }
        try{
            conn = DriverManager.getConnection(DBURL,DBUSER,DBPASS);
        }catch(SQLException e){
            e.printStackTrace();
        }
        return conn;
    }




    /**
     * 數據庫操作Statement
     * @return
     */
    public static Statement getStatement(Connection con){
        //con = DbUtil.getConnection();
        try {
            if (con != null) {
                pstm = con.createStatement();
            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return pstm;
    }



    /**
     * 數據庫操作PreparedStatement
     * @return
     */
    public static PreparedStatement getPreparedStatement(Connection con,String sql) {
        //con = DbUtil.getConnection();
        if (con != null) {
            try {
                pstmt = conn.prepareStatement(sql);
            } catch (SQLException e) {

                e.printStackTrace();
            }
        }
        return pstmt;
    }

/*    此方法不需要寫，會出現丟失In或者Out參數
    public static ResultSet getResultSet(Connection conn,String sql){
        pstmt = DbUtil.getPreparedStatement(conn, sql);
        try {
            rs = pstmt.executeQuery();
        } catch (SQLException e) {

            e.printStackTrace();
        }
        return rs;
    }
*/

    /**
     * 關閉數據庫連接
     * @param conn
     */
    public static void close(Connection conn){
        if(conn!=null){
            try{
                conn.close();
            }catch(SQLException e){
                e.printStackTrace();
            }
        }
    }


    /**
     * 關閉數據庫操作Statement
     * @param stmt
     */
    public static void close(Statement stmt){
        if(stmt!=null){
            try{
                stmt.close();
            }catch(SQLException e){
                e.printStackTrace();
                }
        }
    }


    /**
     * 關閉數據庫操作PreparedStatement
     * @param pstmt
     */
    public static void close(PreparedStatement pstmt){
        if(pstmt!=null){
            try{
                pstmt.close();
            }catch(SQLException e){
                e.printStackTrace();
            }
        }
    }


    /**
     * 關閉數據庫查詢
     * @param rs
     */
    public static void close(ResultSet rs){
        if(rs!=null){
            try{
                rs.close();
            }catch(SQLException e){
                e.printStackTrace();
            }
        }
    }


    /**
     * 主方法用於測試
     * @param args
     */
    public static void main(String[] args) {

        System.out.println(DbUtil.getConnection());
    }

}