深入探索动态SQL在SQL Server中的应用与安全

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"《Dynamic SQL: Applications, Performance, and Security in SQL Server 2nd Edition》是关于在微软SQL Server中使用动态SQL的深入指南，涵盖了SQL Server 2016和2017的新特性。本书旨在帮助开发人员和数据库管理员提高应用的灵活性，利用动态SQL实现性能优化和安全的业务智能解决方案。" 本书详细介绍了动态SQL在各种场景下的应用，如根据用户输入条件进行大规模搜索、生成值列表、动态数据透视以及自定义数据库对象。作者Edward Pollack强调了动态SQL对于响应快速变化的商业需求的重要性，并提供了如何安全防御SQL注入攻击的策略。在性能方面，书中有大量关于如何在存储过程和动态SQL中解决性能问题的内容。学习者将了解到如何编写高效且易于维护的代码，同时减少对系统性能的影响。此外，书中还涵盖了动态SQL的调试技巧，以确保正确执行结果。针对安全问题，作者详细阐述了SQL注入的风险以及如何建立有效的防御机制，使读者能够自信地使用动态SQL而不必担心安全性问题。这包括最佳实践和防范措施，帮助开发人员构建安全的应用程序。自动化数据库管理是另一个关键主题，本书展示了如何使用动态SQL自动化SQL Server中的各种管理任务，从而提高工作效率。本书的目标读者是希望提升T-SQL编码技能的开发人员和数据库管理员。无论是在追求应用灵活性，还是寻求解决与动态SQL相关的性能问题，或者是想了解动态SQL的基础知识和其为企业带来的竞争优势，这本书都是理想的选择。《Dynamic SQL: Applications, Performance, and Security in Microsoft SQL Server》是掌握动态SQL的全面教程，它将帮助读者在理解和应用动态SQL方面达到新的高度，同时确保在安全性和性能方面达到最佳实践。通过学习本书，读者可以将组织的响应能力提升到一个新的水平，在日益激烈的全球市场竞争中获得优势。

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Intended Audience

Anyone with a healthy interest in database administration or development can benefit

from the topics covered within this book. Each chapter starts out with basic definitions

and examples, providing an easy entry point for professionals with any level of

experience. We transition into more advanced techniques, allowing you to not only learn

the basics of an important subject, but also gain access to scripts and ideas that could be

tested and used to solve problems you may face in your everyday experiences.

If you have a particular interest in database security or optimziation, then you will

appreciate the focus on these topics in each chapter. SQL Injection gets an exhaustive

review, with many different aspects and examples presented to ensure a thorough

explanation of this important topic! Every chapter, regardless of topic, will reference

performance whenever possible. It is an oft-made mistake that a database is designed

with little data and few users, ignoring the possibility that it will one day grow into a

behemoth. Reminders are placed throughout this book to consider query performance

at all times, even when performance may seem “good enough.”

Contacting theAuthor

We can only grow personally and professionally if we are willing to consider other

viewpoints and revise our own to improve.

I love hearing from anyone who has ideas, questions, applications, video game

recommendations, or criticism. Please contact me at ed7@alum.rpi.edu and let me

know what I can do to improve the content of this book, or address any questions or

problems you may have.

InTroduCTIon

The benefit of storing our T-SQL command as a string is that we are free to use any

string manipulation commands on it, building it in one or many steps. Now to tackle our

original problem: how to select data from a table that is not defined until runtime. To

accomplish this, we remove Person.Person from the string and replace it with a variable

that we define as shown previously:

DECLARE @sql_command NVARCHAR(MAX);

DECLARE @table_name SYSNAME;

SELECT @table_name = 'Person.Person';

SELECT @sql_command = 'SELECT TOP 10 * FROM ' + @table_name;

EXEC (@sql_command);

The variable @table_name stores the name of the table we wish to query.

Commonly, this would be passed in as a parameter, either from other stored

procedures, or an application that calls this directly. By building it into @sql_command,

we gain the flexibility of querying any table we wish, without hard-coding it ahead

of time. While this is a trivial example (how often will we want to select data in this

fashion?), it provides the basis for thousands of applications, each of which can save

immense time, resources, and complexity. Before diving further into the details of

dynamic SQL and its many uses, let’s look at a more practical (and more complex)

example of dynamic SQL in action.

Dynamic SQL inAction

A common maintenance need is to run T-SQL against many databases on a server.

This maintenance could involve backing up databases, rebuilding indexes, reporting

on critical data elements, or many other applications. If our database list never

changes and no databases are ever renamed, we could hard-code names into each

procedure and not need to worry about changing them in the future. This would work

until the one day when we finally experience those inevitable changes, moving or

renaming databases, ultimately breaking those valuable maintenance procedures. It’s

critical that our maintenance, monitoring, and reporting jobs operate with the highest

level of reliability possible.

Listing 1-1 shows a common example of a statement that could be used to run a

backup against a single database, storing it on a local drive.

CHAPTER 1 WHAT IS DYNAMIC SQL?

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深入探索动态SQL在SQL Server中的应用与安全

ambiguous overload for ‘operator<<’ (operand types are ‘std::basic_ostream<char>’ and ‘Poco::Dynamic::Var’) std::cout << "result is: " << result << std::endl;

cannot convert ‘Poco::JSON::Object*’ to ‘Poco::Dynamic::Var*’ in initialization _ptr(const_cast<Other*>(ptr.get()))

Compare: Static Testing and Dynamic Testing

select mybatis

Matrix<float, Eigen::Dynamic, Eigen::Dynamic> aa = Map<Matrix<float, Eigen::Dynamic, Eigen::Dynamic, Eigen::RowMajor>>(H,num,num);

sql server 跟踪工具

Eigen Matrix<double, Eigen::Dynamic, Eigen::Dynamic>如何简写

mybatisplus

sql server的性能监视器在哪

sql server来龙去脉系列

SQL server 如何查看db性能

sql server性能监控

mybatis增强框架

mybatis-plus

dynamic sql is not allowed in stored function or trigger

kettle 查询_执行dynamic_sql

@SelectProvider(type = MySelectProvider.class, method = "dynamicSQL") List<User> selectByRoleAndPage(@Param("role") int role, RowBounds rowBounds);请示例一个springboot项目中的MySelectProvider类

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cannot convert ‘Poco::JSON::Object’ to ‘Poco::Dynamic::Var’ in initialization _ptr(const_cast<Other*>(ptr.get()))