search
HomeDatabaseMysql Tutorial Transact-SQL 示例

Transact-SQL 示例

Jun 07, 2016 pm 05:45 PM
dynamicexternalSplicingExampletransfer

任务需求是这样的,定义一个存储过程可以根据设定的存储过程参数去查询某个表返回可以分页的,参数的功能如下: 1.返回记录集的第n页(@pageNo) 2.每页显示n条记录(@pageSize) 3.筛选条件(@where) 4.排序规则(@orderby) 5.总记录数(@rows) Ok,在拿

任务需求是这样的,香港虚拟主机,定义一个存储过程可以根据设定的存储过程参数去查询某个表返回可以分页的,参数的功能如下:
1.返回记录集的第n页(@pageNo)
2.每页显示n条记录(@pageSize)
3.筛选条件(@where)
4.排序规则(@orderby)
5.总记录数(@rows)

Ok,在拿到需求后,香港服务器,便开始分析。。。这里需要使用到拼接sql字符串变量然后Exec @sql即可,美国空间,但是实践发现。Exec @sql并不能把总记录数传递给外部的@rows OUTPUT参数上,为此stackoverflow一番发现答案。

下面是本人目前的做法: 

--定义存储过程 -- 示例过程中使用每个数据库都会自带的系统视图sys.objects作为测试用表 CREATE PROCEDURE dbo.Demo1 @pageNo int = 1, @pageSize int = 10, @where nvarchar(1000) = N'', @orderby nvarchar(1000) = N'name asc', @rows int OUTPUT AS BEGIN DECLARE @sql nvarchar(max) SET @sql = N'SELECT @rowsInner = COUNT(1) FROM sys.objects' IF @where N'' SET @sql = @sql + N' WHERE ' + @where SET @sql = @sql + N'; SELECT * FROM ( SELECT ROW_NUMBER() OVER(ORDER BY ' + @orderby + N') RowId, object_id, name FROM sys.objects ' IF (@where N'') SET @sql = @sql + N'WHERE ' + @where SET @sql = @sql + N' ) a WHERE a.RowId between (@pageNoInner - 1) * @pageSizeInner + 1 AND @pageNoInner * @pageSizeInner' --若要调试请撤销如下代码的注释并注释处 --SET @rows = 100 --print @sql -- EXEC sp_executesql @sql, N'@pageNoInner int, @pageSizeInner int, @rowsInner int OUTPUT', @pageNoInner = @pageNo, @pageSizeInner = @pageSize, @rowsInner = @rows OUTPUT -- END

Statement
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
When should you use a composite index versus multiple single-column indexes?When should you use a composite index versus multiple single-column indexes?Apr 11, 2025 am 12:06 AM

In database optimization, indexing strategies should be selected according to query requirements: 1. When the query involves multiple columns and the order of conditions is fixed, use composite indexes; 2. When the query involves multiple columns but the order of conditions is not fixed, use multiple single-column indexes. Composite indexes are suitable for optimizing multi-column queries, while single-column indexes are suitable for single-column queries.

How to identify and optimize slow queries in MySQL? (slow query log, performance_schema)How to identify and optimize slow queries in MySQL? (slow query log, performance_schema)Apr 10, 2025 am 09:36 AM

To optimize MySQL slow query, slowquerylog and performance_schema need to be used: 1. Enable slowquerylog and set thresholds to record slow query; 2. Use performance_schema to analyze query execution details, find out performance bottlenecks and optimize.

MySQL and SQL: Essential Skills for DevelopersMySQL and SQL: Essential Skills for DevelopersApr 10, 2025 am 09:30 AM

MySQL and SQL are essential skills for developers. 1.MySQL is an open source relational database management system, and SQL is the standard language used to manage and operate databases. 2.MySQL supports multiple storage engines through efficient data storage and retrieval functions, and SQL completes complex data operations through simple statements. 3. Examples of usage include basic queries and advanced queries, such as filtering and sorting by condition. 4. Common errors include syntax errors and performance issues, which can be optimized by checking SQL statements and using EXPLAIN commands. 5. Performance optimization techniques include using indexes, avoiding full table scanning, optimizing JOIN operations and improving code readability.

Describe MySQL asynchronous master-slave replication process.Describe MySQL asynchronous master-slave replication process.Apr 10, 2025 am 09:30 AM

MySQL asynchronous master-slave replication enables data synchronization through binlog, improving read performance and high availability. 1) The master server record changes to binlog; 2) The slave server reads binlog through I/O threads; 3) The server SQL thread applies binlog to synchronize data.

MySQL: Simple Concepts for Easy LearningMySQL: Simple Concepts for Easy LearningApr 10, 2025 am 09:29 AM

MySQL is an open source relational database management system. 1) Create database and tables: Use the CREATEDATABASE and CREATETABLE commands. 2) Basic operations: INSERT, UPDATE, DELETE and SELECT. 3) Advanced operations: JOIN, subquery and transaction processing. 4) Debugging skills: Check syntax, data type and permissions. 5) Optimization suggestions: Use indexes, avoid SELECT* and use transactions.

MySQL: A User-Friendly Introduction to DatabasesMySQL: A User-Friendly Introduction to DatabasesApr 10, 2025 am 09:27 AM

The installation and basic operations of MySQL include: 1. Download and install MySQL, set the root user password; 2. Use SQL commands to create databases and tables, such as CREATEDATABASE and CREATETABLE; 3. Execute CRUD operations, use INSERT, SELECT, UPDATE, DELETE commands; 4. Create indexes and stored procedures to optimize performance and implement complex logic. With these steps, you can build and manage MySQL databases from scratch.

How does the InnoDB Buffer Pool work and why is it crucial for performance?How does the InnoDB Buffer Pool work and why is it crucial for performance?Apr 09, 2025 am 12:12 AM

InnoDBBufferPool improves the performance of MySQL databases by loading data and index pages into memory. 1) The data page is loaded into the BufferPool to reduce disk I/O. 2) Dirty pages are marked and refreshed to disk regularly. 3) LRU algorithm management data page elimination. 4) The read-out mechanism loads the possible data pages in advance.

MySQL: The Ease of Data Management for BeginnersMySQL: The Ease of Data Management for BeginnersApr 09, 2025 am 12:07 AM

MySQL is suitable for beginners because it is simple to install, powerful and easy to manage data. 1. Simple installation and configuration, suitable for a variety of operating systems. 2. Support basic operations such as creating databases and tables, inserting, querying, updating and deleting data. 3. Provide advanced functions such as JOIN operations and subqueries. 4. Performance can be improved through indexing, query optimization and table partitioning. 5. Support backup, recovery and security measures to ensure data security and consistency.

See all articles

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
3 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
3 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
3 weeks agoBy尊渡假赌尊渡假赌尊渡假赌
WWE 2K25: How To Unlock Everything In MyRise
3 weeks agoBy尊渡假赌尊渡假赌尊渡假赌

Hot Tools

SublimeText3 Linux new version

SublimeText3 Linux new version

SublimeText3 Linux latest version

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

VSCode Windows 64-bit Download

VSCode Windows 64-bit Download

A free and powerful IDE editor launched by Microsoft

mPDF

mPDF

mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),