将图片存入数据库,首先要在数据库中建立一张表,将存储图片的字段类型设为Image类型,用FileStream类、BinaryReader把图片读成字节的形式,赋给一个字节数组,然后用ADO.SqlCommand对象的ExecuteNonQuery()方法来把数据保存到数据库中。主要代码如下：
private void button1_Click(object sender, EventArgs e)
{
openFileDialog1.Filter = "*jpg|*.JPG|*.GIF|*.GIF|*.BMP|*.BMP";
if(openFileDialog1.ShowDialog()==DialogResult.OK)
{
string fullpath =openFileDialog1.FileName;//文件路径
FileStream fs = new FileStream(fullpath, FileMode.Open);
byte[] imagebytes =new byte[fs.Length];
BinaryReader br = new BinaryReader(fs);
imagebytes = br.ReadBytes(Convert.ToInt32(fs.Length));
//打开数据库
SqlConnection con = new SqlConnection("server=(local);uid=sa;pwd=;database=db_05");
con.Open();
SqlCommand com = new SqlCommand("insert into tb_08 values(@ImageList)",con);
com.Parameters.Add("ImageList", SqlDbType.Image);
com.Parameters["ImageList"].Value = imagebytes;将图片存入数据库,首先要在数据库中建立一张表,将存储图片的字段类型设为Image类型,用FileStream类、BinaryReader把图片读成字节的形式,赋给一个字节数组,然后用ADO.SqlCommand对象的ExecuteNonQuery()方法来把数据保存到数据库中。主要代码如下：
private void button1_Click(object sender, EventArgs e)
{
openFileDialog1.Filter = "*jpg|*.JPG|*.GIF|*.GIF|*.BMP|*.BMP";
if(openFileDialog1.ShowDialog()==DialogResult.OK)
{
string fullpath =openFileDialog1.FileName;//文件路径
FileStream fs = new FileStream(fullpath, FileMode.Open);
byte[] imagebytes =new byte[fs.Length];
BinaryReader br = new BinaryReader(fs);
imagebytes = br.ReadBytes(Convert.ToInt32(fs.Length));
//打开数据库
SqlConnection con = new SqlConnection("server=(local);uid=sa;pwd=;database=db_05");
con.Open();
SqlCommand com = new SqlCommand("insert into tb_08 values(@ImageList)",con);
com.Parameters.Add("ImageList", SqlDbType.Image);
com.Parameters["ImageList"].Value = imagebytes;
将图片存入数据库,首先要在数据库中建立一张表,将存储图片的字段类型设为Image类型,用FileStream类、BinaryReader把图片读成字节的形式,赋给一个字节数组,然后用ADO.SqlCommand对象的ExecuteNonQuery()方法来把数据保存到数据库中。主要代码如下：
private void button1_Click(object sender, EventArgs e)
{
openFileDialog1.Filter = "*jpg|*.JPG|*.GIF|*.GIF|*.BMP|*.BMP";
if(openFileDialog1.ShowDialog()==DialogResult.OK)
{
string fullpath =openFileDialog1.FileName;//文件路径
FileStream fs = new FileStream(fullpath, FileMode.Open);
byte[] imagebytes =new byte[fs.Length];
BinaryReader br = new BinaryReader(fs);
imagebytes = br.ReadBytes(Convert.ToInt32(fs.Length));
//打开数据库
SqlConnection con = new SqlConnection("server=(local);uid=sa;pwd=;database=db_05");
con.Open();
SqlCommand com = new SqlCommand("insert into tb_08 values(@ImageList)",con);
com.Parameters.Add("ImageList", SqlDbType.Image);
com.Parameters["ImageList"].Value = imagebytes;
com.ExecuteNonQuery();
con.Close();
}
}
实现本实例主要是利用SqlDataReader从数据库中把Image字段值读出来，赋给一个byte[]字节数组，然后使用MemoryStream类与Bitmap把图片读取出来。主要代码如下：
private void button1_Click(object sender, EventArgs e)
{
byte[] imagebytes = null;
//打开数据库
SqlConnection con = new SqlConnection("server=(local);uid=sa;pwd=;database=db_05");
con.Open();
SqlCommand com = new SqlCommand("*** top 1* from tb_09", con);
SqlDataReader dr = com.ExecuteReader();
while (dr.Read())
{
imagebytes = (byte[])dr.GetValue(1);
}
dr.Close();
com.Clone();
con.Close();
MemoryStream ms = new MemoryStream(imagebytes);
Bitmap bmpt = new Bitmap(ms);
pictureBox1.Image = bmpt;
}
