Image not displayed programmtically stored in blob column

Question

Hi,
I altered student table to store photoes of students. For this I added STIMG as blob, MIMETYPE,FILENAME,IMAGE_LAST_UPDATE COLUMNS to studentadmitted table. Image stored and displayed in report very nicely. With the following query
select "ROWID",
"ST_ID",
"FIRST_NAME",
"LAST_NAME",
"FFIRST_NAME",
"FLAST_NAME",
"COURSE_ID",
"SESSION_ID",
"CONTACT#" "CONTACT_H",nvl(dbms_lob.getlength(STIMG),0) IMAGE
from "#OWNER#"."STUDENTADMITTED"
Images are displayed in column but they have different sizes.
To control this I modified the query like this
select "ROWID",
"ST_ID",
"FIRST_NAME",
"LAST_NAME",
"FFIRST_NAME",
"FLAST_NAME",
"COURSE_ID",
"SESSION_ID",
"CONTACT#" "CONTACT_H",decode(nvl(dbms_lob.getlength(stimg),0),0,null,
'<img style="border: 4px solid #CCC; -moz-border-radius: 4px; -webkit-border-radius: 4px;" '||
'src="'||
apex_util.get_blob_file_src('P16_stIMG',st_id)||
'" height="75" width="75" alt="Product Image" title="Product Image" />')
detail_img
from "#OWNER#"."STUDENTADMITTED"
Report did'nt run with following error,
report error:ORA-06502: PL/SQL: numeric or value error: character to number conversion error
Win Server 2008
Oracle Database :11G R2
Apex Ver :4.2
Sajjad

Answer 1

Sajjad wrote:
I altered student table to store photoes of students. For this I added STIMG as blob, MIMETYPE,FILENAME,IMAGE_LAST_UPDATE COLUMNS to studentadmitted table. Image stored and displayed in report very nicely. With the following query
select "ROWID",
"ST_ID",
"FIRST_NAME",
"LAST_NAME",
"FFIRST_NAME",
"FLAST_NAME",
"COURSE_ID",
"SESSION_ID",
"CONTACT#" "CONTACT_H",nvl(dbms_lob.getlength(STIMG),0) IMAGE
from "#OWNER#"."STUDENTADMITTED"
Images are displayed in column but they have different sizes.Stick to declarative BLOB images as above. They can be resized in reports using CSS. Add a style sheet in the page Inline CSS property:
td[headers="IMAGE"] img {
  display: block;
  width: 75px;
  border: 1px solid #999;
  padding: 6px;
  background: #f6f6f6;
}where the <tt>IMAGE</tt> value in the attribute selector is the table header ID of the image column. Setting only one dimension (in this case the width) scales the image with the correct aspect ratio. (The border, padding and background properties are just eye candy...)
However, if the original images are large then scaling them in the browser this way is a huge waste of bandwidth and produces poorer quality images than creating proper scaled down versions using image tools. Downloading megapixel images and then reducing them to thumbnail size results in pointlessly pushing millions of bytes that will never be seen.
For improved performance and image quality, and where you require image-specific scaling the best approach is to use the database ORDImage object to produce thumbnail and preview versions automatically. Note that this is not possible in Oracle XE as Multimedia is not included