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Insert, on duplicate update in PostgreSQL?

...rom an answer on Stack Overflow how to perform multiple updates at once in MySQL using the following syntax: 16 Answers ...
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PHP PDO: charset, set names?

I had this previously in my normal mysql_* connection: 9 Answers 9 ...
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Installing specific package versions with pip

I'm trying to install version 1.2.2 of the MySQL_python adaptor, using a fresh virtualenv created with the --no-site-packages option. The current version shown in PyPi is 1.2.3 . Is there a way to install the older version? I found an article stating that this should do it: ...
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Laravel migration: unique key is too long, even if specified

...allows to store long key indexes. Server settings (by default included in MySQL 5.7.7+ / MariaDB 10.2.2+): [mysqld] # default character set and collation collation-server = utf8mb4_unicode_ci character-set-server = utf8mb4 # utf8mb4 long key index innodb_large_prefix = 1 innodb_file_format = barr...
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How to escape single quotes in MySQL

How do I insert a value in MySQL that consist of single or double quotes. i.e 16 Answers ...
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ZMQ: 基本原理 - 开源 & Github - 清泛网 - 专注C++内核技术

...的一个。 本文的目的是解释ØMQ架构的基本概念,它们是如何组合起来的,以及它们被如此设计的原因。   拓扑 拓扑是ØMQ最主要的概念,除非你知道“拓扑”代表什么,否则将与其他概念混淆更难理解,甚至理解不当。 按...
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App Inventor 2开发计步器与定位器 - App Inventor 2 中文网 - 清泛IT论坛,有思想、有深度

...编写“健身宝”手机应用程序   3.问题:   (1)如何获取走路步数、距离?   (2)如何计算走路时间?   (3)如何获得当前位置?   (4)如何存储信息?   4.规划:   (1)利用pedometer(计步器)组件...
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How to convert SQL Query result to PANDAS Data Structure?

...Original answer: I can't help you with SQLAlchemy -- I always use pyodbc, MySQLdb, or psychopg2 as needed. But when doing so, a function as simple as the one below tends to suit my needs: import decimal import pydobc import numpy as np import pandas cnn, cur = myConnectToDBfunction() cmd = "SELE...
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How can I sanitize user input with PHP?

...of that language. For example, if you embed a string in some SQL targeting MySQL, you must escape the string with MySQL's function for this purpose (mysqli_real_escape_string). (Or, in case of databases, using prepared statements are a better approach, when possible.) Another example is HTML: If yo...
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How to properly create composite primary keys - MYSQL

...ep these as two distinct columns. You could use a two-column primay key in mysql ...PRIMARY KEY(id_a, id_b)... but I prefer using a two-column unique index, and having an auto-increment primary key field. share | ...