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1 connection pool 1.1 INTRODUCTION In actual development, "get Connection" or "release resources" are two processes that consume system resources very much. In order to solve this kind of performance problem, we usually use Connection pool technology to share Connection. In this way, we don't need to creat ...

1.mysql configuration file I. linux:/etc/my.cnf file windows:my.ini file Binary log logbin: master-slave copy error log: it is off by default, recording serious warning and error information, details of each startup and shutdown. Query log: log Data file:. myd (store data). myi (store index) frm (store table structure) 2, ...

1, When operating the database, using the prepared statement will greatly improve the performance advantages of operating the database as follows: 1). Readability and maintainability of the code. (use placeholders to represent parameters?) 2) can maximize performance (precompile), MySQL does not support performance optimizat ...

Java implementation file click does not respond jsp page link, click visit action to download the file on the server with IO stream, the problem is that no response is given to any click, and no error is reported in the log. Foreground ajax code Ext.Ajax.request({ url : '/yjy/training/TrainingTimeAction.do?method=downLoadAttchById', params : { ...

SSIS circulates the CSV file by month according to the month and year in the Query Library and names it by that month. Let's take a look at the overall structure. Control flow: Data flow: First of all, we do a task to execute sql. The configuration is as follows: Result set configuration: Note that the variables in the ...

SQLite is an embedded database whose database is a file. Because SQLite itself is written in C and its volume is very small, it is often integrated into various applications, even in iOS and Android apps. SQLite3 is built in Python, so you don't need to install anything to use SQLite in Python. Before using SQLite, we need to understand several ...

I'm writing a LINQ to SQL statement, and I'm using the standard syntax of a regular inner join with an ON clause in C. How do you represent the following in LINQ to SQL: select DealerContact.* from Dealer inner join DealerContact on Dealer.DealerID = DealerContact.DealerID #1 building In fact, it's usually best not to join linq. Wh ...

Design pattern is the solution to the problem. Learning the use of design pattern from the code of God can effectively improve the ability of personal coding and design code. This series of blog is used to summarize the design patterns used in the read framework source code (Spring series, Mybatis) and ...

This one doesn't write demo, because the next one makes a simple memo practice, which can be used as an example. install Just go to the official website to download mysql. Then the MySQL module of node is introduced. npm install --save mysql Use Create database session const mysql = require('mysql') const c ...

This one doesn't write demo, because the next one makes a simple memo practice, which can be used as an example. install Just go to the official website to download mysql. Then the MySQL module of node is introduced. npm install --save mysql Use Create database session const mysql = require('mysql') const c ...