java工具类--数据库操作封装类

　　java对数据库操作简单处理，如下代码即可，封装了 增删改查及获取连接、关闭连接。

代码如下：

package com.test;

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.PreparedStatement;

import java.sql.ResultSet;





/**

 * 操作数据库工具类

 *

 *

 */

public class DbUtil {





    /**

     * 连接数据

     *

     * @return conn

     */

    public static Connection getConnection(String driver,String url,String username,String password) {

        Connection conn = null;

        try {

            Class.forName(driver);

            conn = DriverManager.getConnection(url, username, password);

        } catch (Exception e) {

            e.printStackTrace();

        }

        return conn;

    }



    /**

     * 关闭连接对象

     *

     * @param conn

     *            连接对象

     * @param pstmt

     *            预编译对象

     * @param rs

     *            结果集

     */

    public static void closeAll(Connection conn, PreparedStatement pstmt, ResultSet rs) {

        try {

            if (rs != null) {

                rs.close();

            }

            if (pstmt != null) {

                pstmt.close();

            }

            if (conn != null) {

                conn.close();

            }

        } catch (Exception e) {

            e.printStackTrace();

        }

    }



    /**

     * 增删改操作

     *

     * @param sql

     *            SQL命令

     * @param param

     *            参数

     * @return

     */

    public static int executUpdate(Connection conn,String sql, Object[] param) {

        int result = 0;

        PreparedStatement pstmt = null;

        try {

            pstmt = conn.prepareStatement(sql);

            if (param != null) {

                for (int i = 0; i < param.length; i++) {

                    pstmt.setObject(i + 1, param[i]);

                }

            }

            result = pstmt.executeUpdate();

        } catch (Exception e) {

            e.printStackTrace();

        } finally {

            closeAll(conn, pstmt, null);

        }

        return result;

    }

    /**

     * 查询

     *

     * @return int

     * @date 2015-7-25 上午11:10:06

     */

    public static ResultSet executQuery(Connection conn,String sql, String[] param) {

        PreparedStatement pstmt = null;

        ResultSet result = null;

        try {

            pstmt = conn.prepareStatement(sql);

            if (param != null) {

                for (int i = 0; i < param.length; i++) {

                    pstmt.setString(i + 1, param[i]);

                }

            }

            result = pstmt.executeQuery();

        } catch (Exception e) {

            e.printStackTrace();

        }  

        return result;

    }

}