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The following procedure uses an image stored in a BLOB column of table.Ĭreate or replace procedure get_enc_img_from_tab (p_image_name in varchar2, If we are using a HTTPS URL, we will need to make sure there is an appropriate ACL in place, and there is a wallet containing the root certificate of the site we are visiting. P_clob := p_clob || base64encode(httpuritype.createuri(p_url).getblob()) Thanks to Marco Gralike for reminding me about this. P_clob := p_clob || utl_raw.cast_to_varchar2(utl_encode.base64_encode(l_raw)) Īlternatively, you could achieve the same result using the HTTPURITYPE subtype of the URITYPE. Utl_http.read_raw(l_http_response, l_raw, 12000) L_http_response := utl_http.get_response(l_http_request)

L_http_request := utl_http.begin_request(p_url) The following procedure is similar to the previous one, except it reads data from a HTTP request, rather than from the filesystem.Ĭreate or replace procedure get_enc_img_from_http (p_url in varchar2, P_clob := p_clob || utl_raw.cast_to_varchar2(utl_encode.base64_encode(dbms_lob.substr(l_bfile, l_step, i * l_step + 1))) trunc((dbms_lob.getlength(l_bfile) - 1 )/l_step) loop The UTL_ENCODE and UTL_RAW packages are used to encode the data and convert it to a string suitable for inclusion into the HTML.Ĭreate or replace procedure get_enc_img_from_fs (p_dir in varchar2,įor i in 0. The following procedure uses the DBMS_LOB package to read chunks of data from a BFILE pointing to the image on the filesystem.

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We shall deal with each of these below.Īlthough I am using stored procedures in these examples, in a real system the code would be placed in packages. The original image could come from the file system, a BLOB column in a table in the database or a HTTP request from an app server. L_clob := l_clob || utl_raw.cast_to_varchar2(utl_encode.base64_encode(dbms_lob.substr(p_blob, l_step, i * l_step + 1)))

trunc((dbms_lob.getlength(p_blob) - 1 )/l_step) loop L_step pls_integer := 12000 - make sure you set a multiple of 3 not higher than 24573įor i in 0. Anton Scheffer suggested using the following function to do the base64 encoding, so I've switched across to it where possible, or used a similar approach where a straight substitution doesn't fit.Ĭreate or replace function base64encode(p_blob in blob) The code in first draft of the article was a little verbose. Utl_file.put(l_file, dbms_lob.substr(p_clob, l_step, i * l_step + 1)) trunc((dbms_lob.getlength(p_clob) - 1 )/l_step) loop To do that we will write it out to the file system using the following procedure.Ĭreate or replace procedure create_file_from_clob (p_dir in varchar2, We need a way of checking that the HTML is actually generated correctly. If you are using Oracle 11g, you will need to make sure an appropriate ACL is present to allow network access from the database. The HTTP example needs access to the internet (or some other HTTP server).

dbms_lob.loadfromfile(l_blob, l_bfile, dbms_lob.getlength(l_bfile)) Values (images_seq.nextval, l_file, empty_blob())ĭbms_lob.fileopen(l_bfile, dbms_lob.file_readonly) In this case I'm just using a single image called ' site_logo.gif' that is loaded into the table from the 'IMAGES' directory created previously. Next, create and populate a table to hold images for the database example. Grant read, write on directory images to testuser1 This will be used by the file system examples.Ĭreate or replace directory images as '/tmp/' The example code in this article requires a number of objects to be created.įirst, create a directory object pointing to a physical directory on the database server that the 'oracle' user has read/write permissions on.

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This article illustrates how to build an embedded image in HTML using PL/SQL. When HTML may be viewed offline, like HTML emails, embedding the images rather than using URLs can be advantageous.Reducing the total number of HTTP requests against your app server may improve performance, provided you are not constantly embedding large images.There are a couple of reasons why you might prefer this method: The basic format of the tag contents is shown below, where 'mimetype' is the mime type of the image ('image/png', 'image/gif' etc.) and 'data' is the base64 encoded data that makes up the image. An alternative is to actually embed the image data into the IMG tag. Using a URL in the tag means the browser (or email client) must make a separate HTTP request to get the image. Typically you see this with the source containing a URL, as shown below. The IMG tag allows you to include images in HTML. Home » Articles » Misc » Here HTML with Embedded Images from PL/SQL