vector4wang

public class OpenCVUtils {

    private final static List<List<Integer>> SIX_SIZE = new ArrayList<>();
    private final static List<List<Integer>> TEN_SIZE = new ArrayList<>();

    static {
        SIX_SIZE.add(new ArrayList<Integer>() {{
            add(0);
            add(1);
        }});

vector4wang

1、找对应的rpm源 https://dev.mysql.com/downloads/repo/yum/

2、rpm -Uvh platform-and-version-specific-package-name.rpm

3、查看mysql版本

yum repolist enabled | grep "mysql.*-community.*"

vector4wang

! Configuration File for keepalived

global_defs {
   notification_email {
    381347268@qq.com
   }
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}

vector4wang

rpm -qa | grep jdk

java-1.7.0-openjdk-1.7.0.75-2.5.4.2.el7_0.x86_64


java-1.7.0-openjdk-headless-1.7.0.75-2.5.4.2.el7_0.x86_64


然后删除该jdk

vector4wang

public class MapUdfSample extends GenericUDF {

	private final Map<Text, Text> resultMap = new LinkedHashMap<Text, Text>();

	private final Map<String, String> config_map = new LinkedHashMap<String, String>();

	private transient ObjectInspector[] argumentOIs;

	public void initConfigMap(){
		config_map.put("a","100");

vector4wang

-- name    cost
-- a,b,c	1,2,3
-- 转换得
-- name cost
-- a     1
-- b     2
-- c     3

create table t_split as select 'a,b,c' name,'1,2,3' cost;

vector4wang

{
  "query": {
    "nested": {
      "path": "areaJSon",
      "query": {
        "bool": {
          "must": {
            "exists": {
              "field": "areaJSon"
            }

vector4wang

import requests
import json


_header = {
    'Content-Type': 'application/json',
    'charset': 'utf-8'
}

_data = {

vector4wang

count()

• count(1) 针对每一行，不管是否为null;
• count(*) 针对总数也不管是否为null;
• count(field) 针对该列，会忽略为null的值(空值会计算在内)

DROP TABLE IF EXISTS `counttest`;
CREATE TABLE `counttest` (
  `name` char(1) DEFAULT NULL,
 `age` char(2) DEFAULT NULL

vector4wang

docker pull mysql:5.7

docker run --name local-mysql -p 3308:3306  -e MYSQL_ROOT_PASSWORD=123456 -d mysql:5.7