if [ $node_num -eq 1 ] then echo "MySQL $port Instance is slave ..." exit 0 else echo "MySQL $port Instance is master ..." exit 2 fi fi EOF 赋权: 代码语言:txt AI代码解释 chmod +x /data/consul/shell/check_mysql_mgr_master.sh chmod +x /data/consul/shell/check_mysql_mgr...
importjava.sql.*;publicclassMain{publicstaticvoidmain(String[]args){Stringurl="jdbc:mysql://localhost:3306/my_database";Stringusername="root";Stringpassword="password";try(Connectionconnection=DriverManager.getConnection(url,username,password)){Stringquery="SELECT JSON_UNQUOTE(json_data) FROM my_table...
JSON(JavaScript Object Notation)主要用于互联网应用服务之间的数据交换。MySQL 支持RFC 7159定义的 JSON 规范,主要有JSON 对象和JSON 数组两种类型。下面就是 JSON 对象,主要用来存储图片的相关信息: AI检测代码解析 { "Image": { "Width": 800, "Height": 600, "Title": "View from 15th Floor", "Thumbnai...
# 写一个判断是小数的函数 def is_float(s): s = str(s) if...return True return False # 下面的代码和以上相同,是加了注释的 ^_^ def is_float(s): s = str(s) # 强制转化操作是因为传进来的被判断对象的类型具有不确定性...,是个合法的负小数 return True return False # 除了以上正小数...
set_data_type_json() : Item set_data_type_longlong() : Item set_data_type_null() : Item set_data_type_source() : Item_param set_data_type_string() : Item set_data_type_time() : Item set_data_type_timestamp() : Item set_data_type_utf8() : dd::Parameter, dd::Parameter_im...
update user set authentication_string='' where user='root'; 重启: mysql.server restart; 其他常用: show databases; DROP DATABASE IF EXISTS dbxx; create database dbxx; use dbxx; show tables; select * from tablexx; delete from user where user="xxx"; ...
JSON中属性名称必须用双引号 JSON中表述字符串必须使用双引号 JSON中不能有单行或多行注释 JSON没有undefined这个值 mysql常用命令 show databases; create database +数据库名; 创建一个指定名称的数据库 use +数据库; 使用一个数据库,相当于进入指定的数据库 ...
字符串聚合窗口函数 ❌ STRING_AGG 函数 数组转换为表(UNNEST) ❌ ✔️ 空值排序顺序(ORDER BY NULLS FIRST/LAST) ❌ ✔️ 支持空值的等值比较(IS [NOT] DISTINCT FROM) <=> ✔️ BETWEEN SYMMETRIC 运算符 ❌ ✔️ OVERLAPS 运算符 ❌ ✔️ 单个查询中两次引用同一个临时表 ❌...
The process ID of the monitor process used on Windows platforms by RESTART to spawn and restart a mysqld is now shown in the processes table as an angel_pid. String hashing improvements. Prior to NDB 8.0, all string hashing was based on first transforming the string into a normalized fo...
Note: The query values are first attempted to be parsed as JSON, and if that fails assumed to be plaintext strings. SSL options The ssl option in the connection options takes a string or an object. When given a string, it uses one of the predefined SSL profiles included. The following ...