现在上传下载到数据库都实现了。。可有个问题
我用的从数据库下载的方法是
public void Read(string path)
{
byte[] MyData = new byte[0];
using (SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=Test;Integrated Security=True"))
{
conn.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandText = "select FileContent from Filelib where id =" + id;
SqlDataReader sdr = cmd.ExecuteReader();
sdr.Read();
MyData = (byte[])sdr["FileContent"];
int ArraySize = MyData.GetUpperBound(0);
FileStream fs = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write);
fs.Write(MyData, 0, ArraySize);
fs.Close();
conn.Close();
MessageBox.Show("导出成功");
}
}这个导出TXT没问题,可其他格式的就说文件损坏。。请问怎么解决
我用的从数据库下载的方法是
public void Read(string path)
{
byte[] MyData = new byte[0];
using (SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=Test;Integrated Security=True"))
{
conn.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandText = "select FileContent from Filelib where id =" + id;
SqlDataReader sdr = cmd.ExecuteReader();
sdr.Read();
MyData = (byte[])sdr["FileContent"];
int ArraySize = MyData.GetUpperBound(0);
FileStream fs = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write);
fs.Write(MyData, 0, ArraySize);
fs.Close();
conn.Close();
MessageBox.Show("导出成功");
}
}这个导出TXT没问题,可其他格式的就说文件损坏。。请问怎么解决
{
byte[] MyData = new byte[0];
using (SqlConnection conn = new SqlConnection("Data Source=.;Initial Catalog=Test;Integrated Security=True"))
{
conn.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
cmd.CommandText = "select FileContent from Filelib where id =1";
SqlDataReader sdr = cmd.ExecuteReader();
sdr.Read();
MyData = (byte[])sdr["FileContent"];
FileStream fs = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Write);
fs.Write(MyData, 0, MyData.Length);
fs.Close();
conn.Close();
}
}
SqlCommand logoCMD = new SqlCommand("SELECT pub_id, logo FROM pub_info", pubsConn);FileStream fs; // Writes the BLOB to a file (*.bmp).
BinaryWriter bw; // Streams the BLOB to the FileStream object.int bufferSize = 100; // Size of the BLOB buffer.
byte[] outbyte = new byte[bufferSize]; // The BLOB byte[] buffer to be filled by GetBytes.
long retval; // The bytes returned from GetBytes.
long startIndex = 0; // The starting position in the BLOB output.string pub_id = ""; // The publisher id to use in the file name.// Open the connection and read data into the DataReader.
pubsConn.Open();
SqlDataReader myReader = logoCMD.ExecuteReader(CommandBehavior.SequentialAccess);while (myReader.Read())
{
// Get the publisher id, which must occur before getting the logo.
pub_id = myReader.GetString(0); // Create a file to hold the output.
fs = new FileStream("logo" + pub_id + ".bmp", FileMode.OpenOrCreate, FileAccess.Write);
bw = new BinaryWriter(fs); // Reset the starting byte for the new BLOB.
startIndex = 0; // Read the bytes into outbyte[] and retain the number of bytes returned.
retval = myReader.GetBytes(1, startIndex, outbyte, 0, bufferSize); // Continue reading and writing while there are bytes beyond the size of the buffer.
while (retval == bufferSize)
{
bw.Write(outbyte);
bw.Flush(); // Reposition the start index to the end of the last buffer and fill the buffer.
startIndex += bufferSize;
retval = myReader.GetBytes(1, startIndex, outbyte, 0, bufferSize);
} // Write the remaining buffer.
bw.Write(outbyte, 0, (int)retval - 1);
bw.Flush(); // Close the output file.
bw.Close();
fs.Close();
}// Close the reader and the connection.
myReader.Close();
pubsConn.Close();从数据库中获取值