


Mysql usage in nodejs
1. Establish a database connection: createConnection(Object) method This method accepts an object as a parameter. The object has four commonly used attributes: host, user, password, and database. The same parameters as the database link in php. The attribute list is as follows:
[javascript] view plaincopy
host: The host name where the database is connected. (Default: localhost)
port: The connection port. (Default: 3306)
localAddress: used for TCP connection IP address. (Optional)
socketPath: The path to the unix domain. This parameter will be ignored when using host and port.
user: The username of the MySQL user.
password: The password of the MySQL user.
database: The name of the database to link to (optional).
charset: Connection Character set. (Default: 'UTF8_GENERAL_CI'. Use uppercase when setting this value!)
timezone: The time zone where local time is stored. (Default: 'local')
stringifyObjects: Whether to serialize objects. See issue #501. (Default: 'false')
insecureAuth: Whether to allow old authentication methods to connect to the database instance. (Default: false)
typeCast: Determines whether column values are converted to native JavaScript type column values. (Default: true)
queryFormat: Custom query statement formatting function.
supportBigNumbers: When the database handles large numbers (long integers and decimals), it should be enabled (default: false).
bigNumberStrings: Enable supportBigNumbers and bigNumberStrings and force these Numbers are returned as strings (default: false).
dateStrings: Force date types (TIMESTAMP, DATETIME, DATE) to be returned as strings instead of a javascript Date object. (Default: false)
debug: whether Turn on debugging. (Default: false)
multipleStatements: Whether to allow multiple query statements to be passed in one query. (Default: false)
flags: Link flags.
Nodejs new Date() Save to mysql, Set the attribute dateStrings of the
connection to true, and add 8 hours to the saved time
var date = new Date();
date.setHours(date.getHours() + 8);
then save

本篇文章给大家带来了关于mysql的相关知识,其中主要介绍了关于架构原理的相关内容,MySQL Server架构自顶向下大致可以分网络连接层、服务层、存储引擎层和系统文件层,下面一起来看一下,希望对大家有帮助。

mysql的msi与zip版本的区别:1、zip包含的安装程序是一种主动安装,而msi包含的是被installer所用的安装文件以提交请求的方式安装;2、zip是一种数据压缩和文档存储的文件格式,msi是微软格式的安装包。

方法:1、利用right函数,语法为“update 表名 set 指定字段 = right(指定字段, length(指定字段)-1)...”;2、利用substring函数,语法为“select substring(指定字段,2)..”。

在mysql中,可以利用char()和REPLACE()函数来替换换行符;REPLACE()函数可以用新字符串替换列中的换行符,而换行符可使用“char(13)”来表示,语法为“replace(字段名,char(13),'新字符串') ”。

转换方法:1、利用cast函数,语法“select * from 表名 order by cast(字段名 as SIGNED)”;2、利用“select * from 表名 order by CONVERT(字段名,SIGNED)”语句。

本篇文章给大家带来了关于mysql的相关知识,其中主要介绍了关于MySQL复制技术的相关问题,包括了异步复制、半同步复制等等内容,下面一起来看一下,希望对大家有帮助。

在mysql中,可以利用REGEXP运算符判断数据是否是数字类型,语法为“String REGEXP '[^0-9.]'”;该运算符是正则表达式的缩写,若数据字符中含有数字时,返回的结果是true,反之返回的结果是false。

本篇文章给大家带来了关于mysql的相关知识,其中主要介绍了mysql高级篇的一些问题,包括了索引是什么、索引底层实现等等问题,下面一起来看一下,希望对大家有帮助。


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