In Linux systems, code statistics tools play a very important role. They can help developers understand the size and complexity of the code base, so as to better manage and optimize projects. So what are the common Linux code statistics tools? The following is a detailed introduction. In Linux development, there are some common code statistics tools to help developers understand the code size and structure. These tools can provide information such as the number of lines of code, number of files, etc. 1. Cloc: Cloc is a cross-platform command line tool, used to count the number of lines, comment lines and blank lines of source code, and supports multiple programming languages. SLOCCount is a flexible and customizable line-of-code counting tool that can analyze source code files in the project directory.

When we typeset word documents, we sometimes have to comply with many formatting requirements. For example, when we write papers or other more formal documents, there are many setting requirements, including requirements for fonts, font sizes, line spacing, etc. Sometimes There are even some regulations on the number of lines per page. So how do we set the number of word lines? Let’s try to practice it below, I hope it will help or inspire you! First, we need to create a new Word document and open it. In order to set the number of rows per page, we need to click on the "Page Layout" tab at the top of the page. Next, in the lower right corner we will see an icon that looks like a small square, which can be seen in the red box. The schematic is shown below. 2. After that, click the small square sign to pop up the [Page

In web development, connecting to the database is a crucial step. With the development of PHP, the PDO extension has become the preferred way to connect to databases because it is compatible with multiple databases and provides better error handling and security. This article will provide an in-depth understanding of the safety and execution efficiency of PDO prepared statements to help developers better use PDO to connect to the database. Overview of PDO prepared statements When using PDO to connect to a database, there are two commonly used SQL statements: ordinary statements and prepared statements. Ordinary statements directly change

The core of prevention of SQL injection lies in the use of preprocessing statements, which is the principle of separating SQL logic from data to prevent attackers from manipulating queries. The specific approach is: first define SQL queries with placeholders; then bind data values ??separately to ensure that the input is always regarded as data rather than executable code; finally, secure queries are implemented through PDO or MySQLi to avoid vulnerabilities and risks caused by manual escaping.

Execution of SELECT queries using PHP's preprocessing statements can effectively prevent SQL injection and improve security. 1. Preprocessing statements separate SQL structure from data, send templates first and then pass parameters to avoid malicious input tampering with SQL logic; 2. PDO and MySQLi extensions commonly used in PHP realize preprocessing, among which PDO supports multiple databases and unified syntax, suitable for newbies or projects that require portability; 3. MySQLi is specially designed for MySQL, with better performance but less flexibility; 4. When using it, you should select appropriate placeholders (such as? or named placeholders) and bind parameters through execute() to avoid manually splicing SQL; 5. Pay attention to processing errors and empty results to ensure the robustness of the code; 6. Close it in time after the query is completed.

Use prepared statements in PHP mainly to prevent SQL injection attacks, improve performance, make the code clearer and easier to debug. 1. It effectively prevents SQL injection through parameterized queries, ensuring that user input is always processed as data rather than SQL logic; 2. Preprocessing statements only need to be compiled once when executed multiple times, significantly improving execution efficiency, especially suitable for batch operations; 3. Parameter binding supports position and named placeholders, separates SQL and data, and enhances code readability and maintenance; 4. Errors can be exposed in advance in the prepare stage, and exceptions can be handled uniformly by setting error mode, which helps to quickly debug.

PreparedstatementsinMySQLipreventSQLinjectionandimproveefficiencybyseparatingSQLlogicfromdatainputs.Tousethemeffectively:1)connecttothedatabase,2)preparetheSQLstatementwithplaceholders,3)bindparameterscorrectlybytype(sforstring,iforinteger,etc.),4)ex

PHP preprocessing statements safely execute queries by separating SQL logic from data. 1. Use placeholders (such as ? or :name) instead of directly embedding user input; 2. bind values ??and then execute to ensure that the input is correctly escaped to prevent SQL injection; 3. Improve performance when executing similar queries multiple times; 4. Make the code clearer and easier to maintain; 5. Common errors include directly splicing user input into SQL, ignoring error handling, and replacing representative names or column names with placeholders.