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Checking for an empty field with MySQL
...)" and there's one record with null hotline but it doesn't match.I'm using MySQL 5.6
– Scott Chu
Apr 15 '16 at 10:16
...
How to debug Lock wait timeout exceeded on MySQL?
...al Locking and Mutex Information.
Here is a sample from one of my clients:
mysql> show engine innodb status\G
*************************** 1. row ***************************
Type: InnoDB
Name:
Status:
=====================================
110514 19:44:14 INNODB MONITOR OUTPUT
=================...
AsyncProcedures异步过程扩展 · App Inventor 2 中文网
...作
常见问题
Q: 异步过程中如何更新UI？
Q: 如何处理异步过程的错误？
Q: 异步过程会阻塞应用吗？
Q: 如何控制异步过程的执行顺序？
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Storing Data in MySQL as JSON
...
CouchDB and MySQL are two very different beasts. JSON is the native way to store stuff in CouchDB. In MySQL, the best you could do is store JSON data as text in a single field. This would entirely defeat the purpose of storing it in an R...
常用Sql - 爬虫/数据库 - 清泛IT社区，为创新赋能！
本帖最后由 zqp2013 于 2015-3-17 22:06 编辑
mysql：drop table if exists tablename;
不能写成
drop table tablename if exists tablename;
mysql：建立索引Sql
CREATE TABLE tablename (
`ID` &nbs...
Why does “_” (underscore) match “-” (hyphen)?
...cluding zero characters).
(From section 3.3.4.7. Pattern Matching in the MySQL documentation.)
If you want to use the underscore in like as a literal, you have to escape it:
select * from a where name like '%taz\_manual%.pdf%';
...
How to send an email with Python?
...se user:
If you use 126/163, 网易邮箱, you need to set"客户端授权密码", like below:
ref: https://stackoverflow.com/a/41470149/2803344
https://docs.python.org/3/library/email.examples.html#email-examples
share
...
PDO MySQL扩展模块 检测通不过？ - PHP - 清泛IT论坛，有思想、有深度
...hp.in中下面两行已经放开注释：
extension=pdo.so
extension=pdo_mysql.so
PDO检测仍然通不过。
终极解决方案：
php编译时加上如下参数，重新编译安装php：
--with-pdo-mysql
php编译安装完整参数请参见：http://www.tsingfun.com/html/2015/env_0826/...
Why use sprintf function in PHP?
...example, forcing 2dp, 4-digit numbers, etc. It's quite useful for building MySQL query strings.
Another advantage is that it allows you to separate the layout of the string from the data being fed into it, almost like feeding in paramaters. For example, in the case of a MySQL query:
// For securit...
MySQL pagination without double-querying?
I was wondering if there was a way to get the number of results from a MySQL query, and at the same time limit the results.
...