Shell script integer value comparison, logic test, if statement
1. Conditional test operation
[conditional expression]
(1) document test[file or directory]-d: Whether the directory is directory (test) -e: Test whether the directory or file exists (Exist) -f: Test whether it is a file -r: Test whether the current user has permission to read, -w: Test whether the current user has permission to write -x: T ...
Posted by Sneo on Fri, 20 May 2022 07:41:43 +0300
JDBC connection database
1, jdbc connection to mysql above 8.0
After the mysql version above 8.0 is updated, the corresponding jdbc connection has also changed.
First of all, we need to configure the mysql environment. It is recommended that you go to the Internet to find a tutorial and follow it. I won't talk about the installation and configuration of mysql here.
...
Posted by mjl4975 on Fri, 20 May 2022 03:06:37 +0300
Connecting MySQL database with Linux (C + +)
1, Environmental installation
The first is the installation of MySQL, which is directly installed only with apt get command (this method is recommended here, because it does not need to link the relevant path when compiling later programs)
sudo apt-get install mysql-server
After my installation, the relevant header files and dynamic lib ...
Posted by posidon on Fri, 20 May 2022 01:31:35 +0300
tp3. 2.3 SQL injection vulnerability analysis
thinkphp3.2.3 sql injection vulnerability analysis
First go to ThinkPHP's official website to download thinkphp_v3.2.3 full version source code( https://www.thinkphp.cn/Down ), and then unzip it to the root directory of phpstudy website.
thinkphp3.2.3 where injection
environment
Configuration database
ThinkPHP/Conf/convention.php, crea ...
Posted by madcrazy1 on Wed, 18 May 2022 22:50:05 +0300
How much do you know about the five distributed transactions?
1, Foreword
A Transaction is a Transaction between the beginning and the end of a Transaction.
To put it simply: either all are executed or all fail.
Distributed transactions are naturally transactions running in distributed systems, which are composed of transactions on multiple different machines. As above, only when all transactions in the ...
Posted by mingo on Wed, 18 May 2022 08:36:52 +0300
Solve the problem that Oracle occupies too much disk
background
After the database has been running for some time, the table space has been increasing, but the actual amount of data is not so large. Deleting data or truncate tables does not reduce the tablespace. This is because when the table space is insufficient, it will expand automatically, but it will not shrink automatically.
terms of se ...
Posted by lorewap3 on Wed, 18 May 2022 03:56:25 +0300
Software testing environment -- install MySQL on Linux (detailed), fine sorting
1, Foreword
Several common ways to install software on Linux:
Source code compilationDecompress the compressed package (generally tar.gz)Compiled installation package (RPM, DPKG, etc.)Online installation (YUM, APT, etc.) The convenience of the above methods increases in turn, but the versatility decreases in turn
Delete the development ...
Posted by parkej60 on Wed, 18 May 2022 02:16:56 +0300
Debezium specifies binlog location to initialize exception troubleshooting and repair
Abnormal phenomenon
Recently, the project needs to use Debezium to specify the binlog location to read data. When FileDatabaseHistory is configured to save offset, an unrecognized schema exception will appear.
14:52:18.237 [blc-9.135.12.10:3307] ERROR io.debezium.connector.mysql.MySqlStreamingChangeEventSource - Encountered change event ' ...
Posted by jasonscherer on Wed, 18 May 2022 01:40:00 +0300
JDBC connects IDEA and SQL Server database
Steps of JDBC linking SQL Server database
SQL Server2014 database configuration:
(1). Open the installed SQL Server 2014 Management Studio, select SQL server authentication, and enter the user name (SA by default) and password,
(2). Open the security login, right-click sa, select attribute status, and set whether to allow connection to the da ...
Posted by harrisonad on Tue, 17 May 2022 23:58:36 +0300
Deep parsing resultMap tag
Generally speaking, a table corresponds to a mapper mapping file, but the storage of some attributes in the database does not directly store its contents, but stores its unique identification, such as id. the political outlook, Department, job level and position of employees in the following table are maintained through the id of each sub table ...
Posted by langemarkdesign on Tue, 17 May 2022 21:43:35 +0300