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

SQL statement learning

SQL statement Query statement select SELECT column_name,column_name FROM table_name [WHERE Clause] [LIMIT N][ OFFSET M] select is a query statement, followed by commas to separate multiple columns, and * indicates all columns Which form is it from after from where add conditional restrictions Limit limit the number of displays Offset indic ...

Posted by Sgarissta on Mon, 16 May 2022 03:42:58 +0300