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title: javaEE(SSM) learning notes 4: dynamic SQL Dynamic SQL import [main function]: splice SQL clauses according to different conditions or different data to achieve similar programming effect in XML files. [main element (mark)]: Query criteria: single branch if; Multi branch choose... when... other Special treatment: where /trim Up ...

1, What exactly is the $symbol? $is the attribute defined for the window object in jQuery $and jQuery can be interchanged when used. In fact, it is a function, which comes from the jQuery library jQuery and $are used as an attribute of window             window.jQuery = window.$ = jQuery;             ...

1. Overview JDK hasn't been compiled manually, dare you say you're a Java programmer? (Brother By Sheep- JDK hasn't been compiled manually, dare you say you're a Java programmer? Actual Compile Java Source (JDK Source, JVM) Video Tutorial_ Bell-Bell-Bell_ bilibili) Compiling JDK by hand is theoretically a better JDK for your computer Maybe it ...

Environment Configuration Linux 0 .vimrc #Create a new file in your own directory (~). vimrc vim ~/.vimrc #Add a text configuration (as follows... #Indicates how many spaces a tab shows by default 8 set tabstop=2 #Represents the length of the indentation that falls back when the backspace key is pressed in edit mode set softtabstop=2 #Re ...

linux bg and fg commands Under linux, if we want a task or program to be executed in the background, we can use &. In fact, linux also provides commands for other task scheduling. bg: change a command suspended in the background to continue execution; [background background background]fg: transfer the command in the background to the fore ...

From: https://www.eet-china.com/mp/a55310.html hello, everybody. Today I'm going to take you to learn about USB device driver. Kernel version: 4.4.94 1. Linux USB subsystem Before introducing device-side drivers, let's look at the Linux USB subsystem. The subsystem here is relative to the entire Linux kernel, not a single device. The communic ...