Question

What I need to do (And I know it’s bad practice, but I’m kind of forced to) is upload an image to an SQL DB from Java. Currently, I’m using a prepared statement and trying to use this to upload the bytes from the image.

public void insertImage(Connection conn,String img,String strItemNum)
{

        String query;
        PreparedStatement pstmt;

        try
        {
                File file = new File(img);
                FileInputStream fis = new FileInputStream(file);
                byte[] image = new byte[(int) file.length()];
                fis.read(image);
                System.out.println("image as sent " + image.length);
                query = ("SELECT [Item Picture] from [Inventory] where [Item Number] = '" + strItemNum + "'");
                pstmt = conn.prepareStatement(query);
                System.out.println(pstmt.getMetaData().getColumnName(1) + " of type: " + pstmt.getMetaData().getColumnTypeName(1));
                pstmt.setBytes(1,image);
                pstmt.executeUpdate();
                pstmt.close();


        }
        catch (IOException | SQLException e)
        {
            System.err.println(";"+e.getMessage());
            e.printStackTrace();

        }

}

But this is yielding an SQLException: Invalid parameter index 1. The parameter in my table is of type “image” and I can’t get anything to stick. I’ve tried using .setBlob but from my google research, it appears that Blobs were never implemented very well.

EDIT: Solved by using AVD’s answer

changed to

query = ("Update  [Inventory] set [Item Picture] = ? where [Item Number] = ?");
pstmt = conn.prepareStatement(query);
pstmt.setBytes(1,image);
pstmt.setString(2, strItemNum);
pstmt.executeUpdate();
pstmt.close();

Answer 1

You should have to use INSERT or UPDATE sql statement to add a new record or update an existing row.

String sql="INSERT INTO TableName (Col1,Col2) VALUES (?,?)";

Use ? (question mark) to specify the placeholder.

EDIT:

Connection connection=null;
PreparedStatement statement=null;
String sql="UPDATE TableName set ImageCol1=? WHERE ID=?";
try{
  //Obtain connection 
  statement=connection.prepareStatement(sql);
  statement.setBytes(1,byteArray);
  statement.setInt(2,10);
  ...
}catch(SQLException ex){
  //
}finally{
  if(ps!=null) {
    try{
      ps.close();
    }catch(Exception ex){
      //
    }
  }
 if(cn!=null) {
    try{
      cn.close();
    }catch(Exception ex){
      //
    }
  }
}