2月 182020
 

mysql的正则匹配用regexp,而替换字符串用REPLACE(str,from_str,to_str)

例如
UPDATE myTable SET HTML=REPLACE(HTML,'<br>','') WHERE HTML REGEXP '(<br */*>\s*){2,}'

更多例子如下:

为了找出以“d”开头的名字,使用“^”匹配名字的开始:

SELECT * FROM master_data.md_employee WHERE name REGEXP ‘^d’; Continue reading »

2月 182020
 

题外话,前端也可以调用已有的接口获取ip,例如调用搜狐接口 https://pv.sohu.com/cityjson?ie=utf-8

在spring框架中,获取IP接口,则需要获取 HttpServletRequest 对象,该对象中包含了客户端请求的相关信息。

java代码如下:

/** 
 * @Description: 获取客户端IP地址   
 */  
private String getIpAddr(HttpServletRequest request) {   
    String ip = request.getHeader("x-forwarded-for");   
    if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {   
        ip = request.getHeader("Proxy-Client-IP");   
    }   
    if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {   
        ip = request.getHeader("WL-Proxy-Client-IP");   
    }   
    if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {   
        ip = request.getRemoteAddr();   
        if(ip.equals("127.0.0.1")){     
            //根据网卡取本机配置的IP     
            InetAddress inet=null;     
            try {     
                inet = InetAddress.getLocalHost();     
            } catch (Exception e) {     
                e.printStackTrace();     
            }     
            ip= inet.getHostAddress();     
        }  
    }   
    // 多个代理的情况,第一个IP为客户端真实IP,多个IP按照','分割  
    if(ip != null && ip.length() > 15){    
        if(ip.indexOf(",")>0){     
            ip = ip.substring(0,ip.indexOf(","));     
        }     
    }     
    return ip;   
}

Continue reading »

2月 012020
 

找到两种方法:
1、采用mybatis注解的方式
参见:MyBatis Plus 自定义查询语句
DAO层:

@Select("select b.bomName, " +
		"b.bomProductType, b.bomMaterial, " +
		"o.customerID AS bomID, " +
		"o.ordersDataNo AS qrCode, " +
		"s.deliveryDate AS barCode, " +
		"s.mainType AS workshop " +
		"FROM mes_order_bom b " +
		"LEFT JOIN mes_order_ordersdata o ON b.ordersID = o.id " +
		"LEFT JOIN mes_order_soncontract s ON o.sonContractID = s.id " +
		"WHERE o.ordersDataNo IN (#{orderNoList})")
List<MesOrderBom> getBomAndOrderCodeNumber(@Param("orderNoList")List<String> orderNoList);

Continue reading »

2月 012020
 

mybatis-plus select查询语句默认是查全部字段,有两种方法可以指定要查询的字段

假定表结构如下:

CREATE TABLE `user` (
  `id` bigint(20) NOT NULL COMMENT '主键',
  `name` varchar(30) DEFAULT NULL COMMENT '姓名',
  `age` int(11) DEFAULT NULL COMMENT '年龄',
  `email` varchar(50) DEFAULT NULL COMMENT '邮箱',
  `manager_id` bigint(20) DEFAULT NULL COMMENT '直属上级id',
  `create_time` datetime DEFAULT NULL COMMENT '创建时间'
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

假设目前仅需要查询name,age两个字段。 Continue reading »