How to save pdf into mysql via C# winform and retreive into gridview

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How to save PDF into MySQL via C# Winform and retrieve into gridview. Preview open into adobe reader of selected row of gridview.

What I have tried:

C#

if (openFileDialog.ShowDialog() == DialogResult.OK)
{label1.Text = openFileDialog.FileName;}
string[] FullFileName = openFileDialog.FileName.Split('\\');
string fname = FullFileName.Last().ToString();
byte[] FileContent;
FileStream fs = new FileStream(openFileDialog.FileName, FileMode.Open);
BinaryReader bs = new BinaryReader(fs);
FileContent = bs.ReadBytes(Convert.ToInt32(fs.Length));
fs.Close();
bs.Close();
string Query = "insert into D (FileName,[File]) values(@name,@data)";
MySqlCommand cmd = new MySqlCommand(Query, con);
con.Open();
cmd.Parameters.Clear();
cmd.Parameters.AddWithValue("@name", fname);
cmd.Parameters.AddWithValue("@data", FileContent);
cmd.ExecuteNonQuery();
MessageBox.Show("data saved");

my error are:

MySql.Data.MySqlClient.MySqlException: 'You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '[File]) values('Receipt.pdf',_binary '%PDF-1.3
%Ã¢Ã£ÃÃ

Posted 1-Sep-19 12:47pm

Member 14192879

Updated 1-Sep-19 23:02pm

Suvendu Shekhar Giri

v2

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Comments

Richard MacCutchan 2-Sep-19 4:16am

Remove the square brackets from the column name "File".

Member 14192879 2-Sep-19 5:14am

what datatype I have to use for 'file' column?

Richard MacCutchan 2-Sep-19 5:18am

Look at the MySQL documentation for the one that is best suited to your data content: MySQL :: MySQL 8.0 Reference Manual :: 11.4.3 The BLOB and TEXT Types[^]

Member 14192879 2-Sep-19 5:33am

can you tell me how can retrieve upload pdf into GridView?

1 solution

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OriginalGriff · Accepted Answer · 2019-09-01T23:02:00

Solution 1

MySql doesn't use square brackets round ambiguous or "spaced" column names, it uses backquotes instead:

SQL

INSERT INTO D (FileName, `File`) Values (...

Posted 1-Sep-19 23:02pm

OriginalGriff

Comments

Member 14192879 2-Sep-19 5:34am

HOW CAN I RETRIEVE PREVIOUS PDF STORED FILE?

OriginalGriff 2-Sep-19 5:42am

Don't SHOUT.

Member 14192879 2-Sep-19 5:37am

DataTable dt = new DataTable();
MySqlDataReader myReader = null;
MySqlCommand cmd = new MySqlCommand("SELECT `FileName` FROM `D` WHERE `clientid` LIKE '%" + textBox31.Text + "%'", con);
con.Open();
myReader = cmd.ExecuteReader();
while (myReader.Read())
{
//label115.Text = dataGridView1.CurrentRow.Cells[1].Value.ToString();
label115.Text = (myReader["FileName"].ToString());
}
con.Close();
myReader.Close();

private void label115_Click(object sender, EventArgs e)
{
axAcroPDF1.src = label115.Text;
}

IS THIS CORRECT CODE?