Filesteam是SQL Server2008的新特性,它结合了SQL Server和NTFS文件系统,为Blob类型的数据提供了比较高效的存储和访问方案。我们最近的一个项目就是采用SQL Server的此种特性。下面是使用这种技术的方法。 开启FileStream特性,步骤如下: 在开始菜单中,依
Filesteam是SQL Server2008的新特性,它结合了SQL Server和NTFS文件系统,为Blob类型的数据提供了比较高效的存储和访问方案。我们最近的一个项目就是采用SQL Server的此种特性。下面是使用这种技术的方法。
在“开始”菜单中,依次指向“所有程序”、“Microsoft SQL Server 2008”和“配置工具”,然后单击“SQL Server 配置管理器”。
在 SQL Server Management Studio 中,单击“新建查询”以显示查询编辑器。
USE master; GO CREATE DATABASE FileStreamTestDb ON PRIMARY (NAME = FileStreamTestDb, FILENAME = 'c:\tmp\FileStreamTestDb.mdf'), FILEGROUP FileStreamGroup1 CONTAINS FILESTREAM (NAME = FileStreamGroup1, FILENAME = 'c:\tmp\filestream1.ndf') LOG ON (NAME = FileStreamTestDblog, FILENAME = 'c:\tmp\FileStreamTestDb_log.ldf') GO -- 注意: 对于此脚本,C:\tmp目录必须存在。
use FileStreamTestDb go CREATE TABLE FileStreamTestTable ( [Id] [uniqueidentifier] ROWGUIDCOL NOT NULL UNIQUE, [FileName] NVARCHAR(64) , [BlobData] VARBINARY(MAX) FILESTREAM NULL ) GO
try { OpenFileDialog dialog = new OpenFileDialog(); dialog.Filter = "文件|*.*"; if (dialog.ShowDialog() == DialogResult.OK) { using (SqlConnection conn = new SqlConnection(CONNECTIONSTRING)) { conn.Open(); using (SqlCommand cmd = conn.CreateCommand()) { cmd.CommandText = "INSERT INTO FileStreamTestTable(FileName, BlobData) VALUES(@fileName, @file)"; SqlParameter param = new SqlParameter("@fileName", SqlDbType.NVarChar, 64); param.Value = dialog.FileName; cmd.Parameters.Add(param); FileStream fs = new FileStream(dialog.FileName, FileMode.Open); byte[] bytes = new byte[fs.Length]; fs.Read(bytes, 0, bytes.Length); SqlParameter param = new SqlParameter("@file", SqlDbType.VarBinary, 1000000); param.Value = bytes; cmd.Parameters.Add(param); MessageBox.Show(cmd.ExecuteNonQuery() == 1 ? "成功保存文件" : "保存文件失败"); fs.Close(); } conn.Close(); } } else { MessageBox.Show("用户取消了操作"); } catch (Exception ex) { MessageBox.Show(ex.Message); } }
try { using (SqlConnection conn = new SqlConnection(CONNECTIONSTRING)) { conn.Open(); using (SqlCommand cmd = conn.CreateCommand()) { cmd.CommandText = "select top 1 BinaryContents from BinaryTable order by ID desc"; SqlDataReader reader = cmd.ExecuteReader(); SaveFileDialog dialog = new SaveFileDialog(); dialog.Filter = "文件(*.*)|*.*"; if (dialog.ShowDialog() == DialogResult.OK) { reader.Read(); System.Data.SqlTypes.SqlBinary result = reader.GetSqlBinary(0);//值得注意的是这里并没有什么GetSqlImage的方法 FileStream fs = new FileStream(dialog.FileName, FileMode.Create); fs.Write(result.Value, 0, result.Length); fs.Close(); reader.Close(); } else { MessageBox.Show("用户取消操作"); } } conn.Close(); } } catch (Exception ex) { MessageBox.Show(ex.Message); }
上面内容并非原创,香港虚拟主机,而是从一些网站截取,下面是一些参考文章,里面介绍了一些更详细的内容:
Sql Server 2008 FileSteam全攻略(一)---FileStream介绍
Sql Server 2008 FileSteam全攻略(二)---FileStream安装
在SQL Server 2008中配置FILESTREAM(百度文库)
Programming with FileStreams in SQL Server 2008(MSDN)
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MySQL is suitable for beginners to learn database skills. 1. Install MySQL server and client tools. 2. Understand basic SQL queries, such as SELECT. 3. Master data operations: create tables, insert, update, and delete data. 4. Learn advanced skills: subquery and window functions. 5. Debugging and optimization: Check syntax, use indexes, avoid SELECT*, and use LIMIT.

MySQL efficiently manages structured data through table structure and SQL query, and implements inter-table relationships through foreign keys. 1. Define the data format and type when creating a table. 2. Use foreign keys to establish relationships between tables. 3. Improve performance through indexing and query optimization. 4. Regularly backup and monitor databases to ensure data security and performance optimization.

MySQL is an open source relational database management system that is widely used in Web development. Its key features include: 1. Supports multiple storage engines, such as InnoDB and MyISAM, suitable for different scenarios; 2. Provides master-slave replication functions to facilitate load balancing and data backup; 3. Improve query efficiency through query optimization and index use.

SQL is used to interact with MySQL database to realize data addition, deletion, modification, inspection and database design. 1) SQL performs data operations through SELECT, INSERT, UPDATE, DELETE statements; 2) Use CREATE, ALTER, DROP statements for database design and management; 3) Complex queries and data analysis are implemented through SQL to improve business decision-making efficiency.

The basic operations of MySQL include creating databases, tables, and using SQL to perform CRUD operations on data. 1. Create a database: CREATEDATABASEmy_first_db; 2. Create a table: CREATETABLEbooks(idINTAUTO_INCREMENTPRIMARYKEY, titleVARCHAR(100)NOTNULL, authorVARCHAR(100)NOTNULL, published_yearINT); 3. Insert data: INSERTINTObooks(title, author, published_year)VA

The main role of MySQL in web applications is to store and manage data. 1.MySQL efficiently processes user information, product catalogs, transaction records and other data. 2. Through SQL query, developers can extract information from the database to generate dynamic content. 3.MySQL works based on the client-server model to ensure acceptable query speed.

The steps to build a MySQL database include: 1. Create a database and table, 2. Insert data, and 3. Conduct queries. First, use the CREATEDATABASE and CREATETABLE statements to create the database and table, then use the INSERTINTO statement to insert the data, and finally use the SELECT statement to query the data.

MySQL is suitable for beginners because it is easy to use and powerful. 1.MySQL is a relational database, and uses SQL for CRUD operations. 2. It is simple to install and requires the root user password to be configured. 3. Use INSERT, UPDATE, DELETE, and SELECT to perform data operations. 4. ORDERBY, WHERE and JOIN can be used for complex queries. 5. Debugging requires checking the syntax and use EXPLAIN to analyze the query. 6. Optimization suggestions include using indexes, choosing the right data type and good programming habits.


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