MySql连接数据库和操作(java)

package org.wxd.weixin.util;

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

public class MySQLUtil {
　　public Connection getConnection(){
　　Connection conn = null;
　　String url ="jdbc:mysql://IP地址/数据库";
　　String user ="用户名";
　　String password ="密码";
try {

　　Class.forName("com.mysql.jdbc.Driver");
　　conn = DriverManager.getConnection(url, user, password);
} catch (Exception e) {
　　// TODO Auto-generated catch block
　　e.printStackTrace();
}
　　return conn;
}

/**
* 释放资源
*/
public void releaseResource(Connection conn, PreparedStatement ps,ResultSet rs){
　　try {
　　　　if(null != rs)
　　　　　　rs.close();
　　　　if(null != ps)
　　　　　　ps.close();
　　　　if(null != conn)
　　　　　　conn.close();
} catch (SQLException e) {
　　　　// TODO Auto-generated catch block
　　　　e.printStackTrace();
}
}

//保存用户信息
public static void saveWeixinUser(String openId){
MySQLUtil mysql = new MySQLUtil();
Connection conn = mysql.getConnection();
PreparedStatement ps = null;
String sql = "insert into weixin_user(open_id,subscribe_time,subscribe_status) values(?,now(),1)";
try {
ps = conn.prepareStatement(sql);
ps.setString(1, openId);
ps.execute();
} catch (SQLException e) {
e.printStackTrace();
}finally {
mysql.releaseResource(conn,ps,null);
}

}

//保存用户签到信息
public static void saveWeixinSign(String openId,int signPoints){
MySQLUtil mysql = new MySQLUtil();
Connection conn = mysql.getConnection();
PreparedStatement ps = null;
String sql = "insert into weixin_sign(open_id,sign_time,sign_points) values(?,now(),?)";
try {
ps = conn.prepareStatement(sql);
ps.setString(1, openId);
ps.setInt(2, signPoints);
ps.execute();
} catch (SQLException e) {
e.printStackTrace();
}finally {
mysql.releaseResource(conn,ps,null);
}

}

//更新用户总积分
public static void updateUserPoints(String openId,int signPoints){
MySQLUtil mysql = new MySQLUtil();
Connection conn = mysql.getConnection();
PreparedStatement ps = null;
String sql = "update weixin_user set points=points+? where open_id=?";
try {
ps = conn.prepareStatement(sql);
ps.setInt(1, signPoints);
ps.setString(2, openId);
ps.execute();
} catch (SQLException e) {
e.printStackTrace();
}finally {
mysql.releaseResource(conn,ps,null);
}
}

//查询用户总积分
public static String selectUserPoints(String openId){
MySQLUtil mysql = new MySQLUtil();
Connection conn = mysql.getConnection();
PreparedStatement ps = null;
ResultSet rs = null;
String sql = "select points from weixin_user where open_id=?";
String points = null;
try {
ps = conn.prepareStatement(sql);
ps.setString(1, openId);
rs = ps.executeQuery();
if(rs.next()){
points = rs.getString("points");
}
} catch (SQLException e) {
e.printStackTrace();
}finally {
mysql.releaseResource(conn,ps,rs);
}
return points;
}

//判断用户今天是否签到
public static boolean isTodaySigned(String openId){
boolean result = false;

MySQLUtil mysql = new MySQLUtil();
Connection conn = mysql.getConnection();
PreparedStatement ps = null;
ResultSet rs = null;
String sql = "select count(*) as signCounts from weixin_sign where open_id=? and date_format(sign_time,'%Y-%m-%d')=date_format(now(),'%Y-%m-%d')";
try {
ps = conn.prepareStatement(sql);
ps.setString(1, openId);
rs = ps.executeQuery();

int signCounts = 0;

if(rs.next()){
signCounts = rs.getInt("signCounts");
}
if(1 == signCounts)
result = true;

} catch (SQLException e) {
e.printStackTrace();
}finally {
mysql.releaseResource(conn,ps,rs);
}
return result;
}

/**
* 判断用户本周是否第七次签到
*
* @param openId 用户openid
* @param monday 本周周一的日期时间
* @return
*/
public static boolean isSevenSign(String openId,String monday){
boolean result = false;

MySQLUtil mysql = new MySQLUtil();
Connection conn = mysql.getConnection();
PreparedStatement ps = null;
ResultSet rs = null;
String sql = "select conut(*) as signCounts from weixin_sign where open_id=? and sign_time between str_to_date(?,'%Y-%m-%d %H:%i:%s') and now()";
try {
ps = conn.prepareStatement(sql);
ps.setString(1, openId);
ps.setString(2, monday);
rs = ps.executeQuery();

int signCounts = 0;

if(rs.next()){
signCounts = rs.getInt("signCounts");
}
if(6 == signCounts)
result = true;

} catch (SQLException e) {
e.printStackTrace();
}finally {
mysql.releaseResource(conn,ps,rs);
}
return result;
}
}