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原 PageHelper分页后对list进行操作，然后放到一个新的list里面导致分页失效

一：场景。我的业务需求是需要用PageHelper分页，然后对分页的list进行操作，然后放到一个新的list里面，这样会导致PageHelper分页失效。通俗来讲就是，查询出来一共是20条数据，但是返回给前端的只有8条数据。二：之前的代码（错误）public ReturnMsgUtils selectCheckData(Map<String, Object> params) {

2021-02-02 17:36:58 阅读(2706)

原 hive批量新增报错：ERROR c.a.d.p.DruidPooledPreparedStatement - [,82] - getMaxFieldSize error

一：介绍：我已经用spring boot 集成了hive，然后进行批量新增的操作，报错信息如下：10:03:58.810 [http-nio-9999-exec-6] INFO c.g.mapper.HiveDao - [batchInsertUpload,64] - 批量新增hive：insert into table ads_smart.user_upload_cust_store

2021-02-02 10:37:06 阅读(2458)

原 postgresql 批量插入报错：org.postgresql.util.PSQLException: An I/O error occurred while sending to the back

前提：我使用postgresql批量插入，一次性插入500条数据报错如下13:36:15.959 [http-nio-9999-exec-2] WARN c.z.h.p.ProxyConnection - [checkException,153] - HikariPool-1 - Connection org.postgresql.jdbc.PgConnection@9d18918 marked

2021-01-12 17:15:18 阅读(4057)

原 java.sql.SQLException: null, message from server: "Host 'xxx' is blocked because of many

mysql错误：java.sql.SQLException: null, message from server: "Host '112.87.186.103' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'" at com.mysql.cj.jdbc.exceptions.S

2021-01-02 23:39:23 阅读(938)

原 Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column '

mysql 报错如下：### Cause: java.sql.SQLSyntaxErrorException: Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column 'mszl_new.m.menu_sort' which is not functionally de

2021-01-02 09:18:58 阅读(2122)

原 WARN: Establishing SSL connection without server's identity verification is not recommended. Accordi

项目连接mysql的时候出现如下的错误信息：Mon Dec 21 12:24:01 CST 2020 WARN: Establishing SSL connection without server's identity verification is not recommended. According to MySQL 5.5.45+, 5.6.26+ and 5.7.6+ requireme

2020-12-21 13:41:34 阅读(792)

原 centos 8 下安装redis

一：安装gccyum -y install gcc二：下载redis安装包。wget http://download.redis.io/releases/redis-6.0.8.tar.gz解压tar -zxvf redis-6.0.8.tar.gz三：切换到redis解压目录下执行make命令cd /opt/redis-6.0.8make四：安装并指定目录make install PREFIX=

2020-12-20 21:43:35 阅读(763)

原 nginx: [emerg] unknown directive 'ssl' in /usr/local/nginx/conf/nginx.conf

一：到nginx解压目录。cd /opt/nginx-1.9.8二：执行命令./configure --with-http_ssl_module三：执行make命令，注意这里是make，不是make install否则会覆盖安装目录make如果执行完make命令后报错如下： src/core/ngx_murmurhash.c: In function ‘ngx_murmur_hash2’:s

2020-12-19 20:06:52 阅读(5690)

原 java 移动文件夹内的文件，从一个目录移动到另外一个目录

一：需求：我们将文件夹55下面所有的文件全部移动到66文件夹中。移动前：55文件夹里面有1.txt；2.txt文件。移动前：66文件夹。二：代码如下。public static int fileMove(String from, String to) { try { File dir = new File(from); File[] fil

2020-12-15 14:30:16 阅读(1214)

原 jsp获取当前地址栏的路径

方法一：${requestScope['javax.servlet.forward.request_uri']}方法二：<% String url=request.getAttribute("javax.servlet.forward.request_uri").toString(); %> <%=url%>方法一和方法二都是直接写在jsp页面即可。

2020-12-05 18:39:47 阅读(670)

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