How to insert byte array into SQL table?

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Hi,

I Prepared a hex string from the Byte array and using it in the query for concatenation. a hex string will look like 0x123456789ABCDEF

C#

hexStr = "0x1234FFCD5";
sql = "Insert into MembersTable
(col1,col2,col3,col4)"
         + "VALUES('" + _GUID + "','" + _Name + "','" + _Pass + "','"
+ hexStr + "');";

will this process will work
am getting error like

Implicit conversion from data type varchar to binary is not allowed. Use the CONVERT function to run this query

Posted 3-Jan-12 5:00am

pradeep manne

Updated 25-Aug-17 1:36am

v4

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Wendelius · Answer 1 · 2012-01-03T05:23:00

Instead of concatenating the values into your SQL statement, use SqlParameter[^].

The statement could look something like:

C#

sql = "Insert into MembersTable
(col1,col2,col3,col4)"
         + "VALUES(@guid,@name,@pass,@hexstr);";

Now if you define the parameter @hexstr to type binary (see: http://msdn.microsoft.com/en-us/library/system.data.sqldbtype.aspx[^]) you can assign a proper binary value to the parameter and you don't have to convert it at database side.

Also consider using varbinary instead of binary if the length of the binary data varies a lot.

Chetan Ghorley · Answer 2 · 2012-01-03T06:06:00

Parameterizing the query can solve this problem

C#

hexStr = "0x1234FFCD5";
sql = "Insert into MembersTable(col1,col2,col3,col4) VALUES(@guid, @name, @pass, @hex);";

SqlCommand insertCmd=new SqlCommand(sql, conn); /*Assuming conn is an open SqlConnection*/

insertCmd.Parameters.Add("@guid",_GUID);
insertCmd.Parameters.Add("@name",_Name);
insertCmd.Parameters.Add("@pass",_Pass);
insertCmd.Parameters.Add("@hex",hexStr); 

insetCmd.ExecuteNonQuery();

If problem persists, please provide the full code.

devbtl · Answer 3 · 2012-01-03T05:22:00

convert your file into byte

Byte[] Attimg;
using (FileStream fs = new FileStream(fileURL, FileMode.Open))
{
BinaryReader reader = new BinaryReader(fs);

Attimg = reader.ReadBytes((int)fs.Length);

fs.Close();
}

and then save it into database..

qry=insert into table (c1,c2,c3) values ('"+c1+"','"+c2+"',@c3);

cmd=new sqlcommand(qry,con);

cmd.parameter.addwithvalue(@c3,sqldbtype.binary).value=Attimg;

con.open();
cmd.executenonquery();
con.close();

How to insert byte array into SQL table?

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