从WinForms C#应用程序从SQL Server 2005/2008上载/下载文件?
我正在使用DocX创建.DocX文件。我宁愿将它们存储在SQL数据库中,而不是存储在硬盘、共享或SharePoint上。因此,我的问题是:从WinForms C#应用程序从SQL Server 2005/2008上载/下载文件?,c#,winforms,sql-server-2005,sql-server-2008,c#-3.0,C#,Winforms,Sql Server 2005,Sql Server 2008,C# 3.0,我正在使用DocX创建.DocX文件。我宁愿将它们存储在SQL数据库中,而不是存储在硬盘、共享或SharePoint上。因此,我的问题是: 如何编写适当的代码将文件保存到该数据库 如何编写适当的代码将文件检索到该数据库 我应该为表设置什么样的数据类型来保存docx文件?是图像吗 关于, 疯子 另外,我更希望在使用旧的“学校”方式方面有一个合适的代码: using (var varConnection = Locale.sqlConnectOneTime(Locale.sqlDataConnect
using (var varConnection = Locale.sqlConnectOneTime(Locale.sqlDataConnectionDetailsDepozyt))
using (var sqlQuery = new SqlCommand(preparedCommand, varConnection))
using (var sqlQueryResult = sqlQuery.ExecuteReader())
while (sqlQueryResult != null && sqlQueryResult.Read())
我知道它不使用读卡器,但这里有一个示例可以查询它并保存到磁盘。要将其放回去,只需插入或更新一个字节[]。数据类型将是sql中的varbinary max
SqlConnection connection = new SqlConnection ("...");
connection.Open ();
SqlCommand command = new
SqlCommand ("select...e", connection);
byte[] buffer = (byte[]) command.ExecuteScalar ();
connection.Close();
FileStream fs = new FileStream(@"C:\test.pdf", FileMode.Create);
fs.Write(buffer, 0, buffer.Length);
fs.Close();
读者可能是这样的
while (myReader.Read())
{
byte[] file = myReader.GetBytes(0));
// might be
file = (byte[])GetValue(0);
}
docx文件类似于zip文件,它是多个文件的集合。如何将其转换为二进制,然后保存到DB中 下面的方法会奏效 保存
string filePath = "";
string connectionString = "";
FileStream stream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
BinaryReader reader = new BinaryReader(stream);
byte[] file = reader.ReadBytes((int)stream.Length);
reader.Close();
stream.Close();
SqlCommand command;
SqlConnection connection = new SqlConnection(connectionString);
command = new SqlCommand("INSERT INTO FileTable (File) Values(@File)", connection);
command.Parameters.Add("@File", SqlDbType.Binary, file.Length).Value = file;
connection.Open();
command.ExecuteNonQuery();
检索是一个有点复杂的过程,如下所示
SqlConnection connection = new SqlConnection("");
string query =
@" SELECT File FROM FileTable where FileID =" + 125;
SqlCommand command = new SqlCommand(query, connection);
FileStream stream;
BinaryWriter writer;
int bufferSize = 100;
byte[] outByte = new byte[bufferSize];
long retval;
long startIndex = 0;
string pubID = "";
connection.Open();
SqlDataReader reader = command.ExecuteReader(CommandBehavior.Default);
while (reader.Read())
{
pubID = reader.GetString(0);
stream =
new FileStream("abc.docx", FileMode.OpenOrCreate, FileAccess.Write);
writer = new BinaryWriter(stream);
startIndex = 0;
retval = reader.GetBytes(1, startIndex, outByte, 0, bufferSize);
while (retval == bufferSize)
{
writer.Write(outByte);
writer.Flush();
startIndex += bufferSize;
retval = reader.GetBytes(1, startIndex, outByte, 0, bufferSize);
}
writer.Write(outByte, 0, (int)retval - 1);
writer.Flush();
writer.Close();
stream.Close();
} reader.Close();
connection.Close();
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