Monday, April 11, 2011
Wednesday, March 9, 2011
How to add date picker in joomla site…
In your component html file, put the following code at the top of your function:
JHTML::_('behavior.calendar');Then for your date field in your form:
input class="inputbox" type="text" name="startdate" id="startdate" size="25" maxlength="25" value="" &
input type="reset" class="button" value="..." onclick="return showCalendar('startdate','%Y-%m-%d');"Show/Hide multiple DIVs with Select using jQuery
Today ill discuss Show/Hide multiple DIVs with Select using jQuery. Bellow a complete example about that<script type=”text/javascript”>
$(document).ready(function(){
$(‘.box’).hide();
$(‘#dropdown’).change(function() {
$(‘.box’).hide();
$(‘#div’ + $(this).val()).show();
});
});
</script>
<form>
<select id=”dropdown” name=”dropdown”>
<option value=”0″>Choose</option>
<option value=”area1″>DIV Area 1</option>
<option value=”area2″>DIV Area 2</option>
<option value=”area3″>DIV Area 3</option>
</select>
</form>
<div id=”divarea1″>DIV Area 1</div>
<div id=”divarea2″>DIV Area 2</div>
<div id=”divarea3″>DIV Area 3</div>
How to convert rpm to deb?
To convert a rpm to a deb file with alien you should first install alien
sudo apt-get install alienThen only need to do
sudo alienAfter you run that command alien should then do its magic and create a .deb file in the same directory for you to use.
Example: sudo alien avg-10.0.1.rpm
Get the width and height of an image using a function in PHP
This is a very useful function in PHP. PHP provides function to get the width and height of an image. The
getimagesize() function will determine the size of image file including flash file(swf).
Syntax
This is a sample code, change image_name to your image name and test it!
Image width 379
Image height 344
Image type 2
Image attribute width=”379″ height=”344″
You will get the width, height, type of an image and also attribute of an image, I use this function in my image
upload form.
Type of an image you can see from table below You can read a full manual here
Type of the image
1 = GIF 5 = PSD 9 = JPC 13 = SWC
2 = JPG 6 = BMP 10 = JP2 14 = IFF
3 = PNG 7 = TIFF(intel byte order) 11 = JPX 15 = WBMP
4 = SWF 8 = TIFF(motorola byte order) 12 = JB2 16 = XBM
getimagesize() function will determine the size of image file including flash file(swf).
Syntax
list($width, $height, $type, $attr) = getimagesize(“image_name.jpg”);Code
This is a sample code, change image_name to your image name and test it!
When you run this script you will see the result like this
list($width, $height, $type, $attr) = getimagesize(“image_name.jpg”);
echo “Image width ” .$width;
echo “
”;
echo “Image height ” .$height;
echo “
”;
echo “Image type ” .$type;
echo “
”;
echo “Attribute ” .$attr;
?>
Image width 379
Image height 344
Image type 2
Image attribute width=”379″ height=”344″
You will get the width, height, type of an image and also attribute of an image, I use this function in my image
upload form.
Type of an image you can see from table below You can read a full manual here
Type of the image
1 = GIF 5 = PSD 9 = JPC 13 = SWC
2 = JPG 6 = BMP 10 = JP2 14 = IFF
3 = PNG 7 = TIFF(intel byte order) 11 = JPX 15 = WBMP
4 = SWF 8 = TIFF(motorola byte order) 12 = JB2 16 = XBM
How to create schema for Oracle APEX Workspace?
If you choose to create a schema while creating the workspace in Oracle Application Express administration service, APEX will create a brand new tablespace as well. This may not be an ideal situation. Having too many tablespaces, specially when it is not required, adds management and administrative overhead.
You can use the following script to create the schema and then just use this schema when you are creating the worksace.
You can use the following script to create the schema and then just use this schema when you are creating the worksace.
– Connect as SYSTEM or DBA UserThese commands will create the schema and assign the same privileges to that schema that gets assigned when you create a new schema while creating the APEX workspace (verified in Oracle APEX 4.1). Once the schema is created specify ‘Yes’ for Re-use existing schema and then specify the schema name.
$ sqlplus system/password@XE
– Create the new Schema/User
CREATE USER APEXAPPS IDENTIFIED BY APEXAPPS
DEFAULT TABLESPACE APEXAPPS_TS
TEMPORARY TABLESPACE TEMP;
– Grant quota on assigned tablespace
ALTER USER APEXAPPS QUOTA 10M ON APEXAPPS_TS ;
– Grant Role Priviledge
GRANT “CONNECT” TO APEXAPPS ;
ALTER USER APEXAPPS DEFAULT ROLE “CONNECT”;
– Grant system privileges
GRANT CREATE JOB TO APEXAPPS ;
GRANT CREATE INDEXTYPE TO APEXAPPS ;
GRANT CREATE SYNONYM TO APEXAPPS ;
GRANT CREATE DIMENSION TO APEXAPPS ;
GRANT CREATE VIEW TO APEXAPPS ;
GRANT CREATE CLUSTER TO APEXAPPS ;
GRANT CREATE MATERIALIZED VIEW TO APEXAPPS ;
GRANT CREATE PROCEDURE TO APEXAPPS ;
GRANT CREATE ANY CONTEXT TO APEXAPPS ;
GRANT CREATE TYPE TO APEXAPPS ;
GRANT CREATE SEQUENCE TO APEXAPPS ;
GRANT CREATE OPERATOR TO APEXAPPS ;
GRANT CREATE TRIGGER TO APEXAPPS ;
GRANT CREATE TABLE TO APEXAPPS ;
– Grant Object Privileges
GRANT EXECUTE ON SYS.DBMS_RLS TO APEXAPPS ;
GRANT EXECUTE ON CTXSYS.CTX_DDL TO APEXAPPS ;
GRANT EXECUTE ON CTXSYS.CTX_DOC TO APEXAPPS ;
About 'ROWNUM' in Oracle
ROWNUM is an Oracle pseudo column which numbers the rows in a result set.
SELECT rownum, table_name
FROM user_tables;
ROWNUM TABLE_NAME
————- —————–
1 EMP
2 DEPT
3 BONUS
4 SALGRADE
5 DUMMY
5 rows selected
Here is a summary of how ROWNUM can be used.
Limiting Rows
ROWNUM can be used to limit the number of rows returned by a query in a similar way to LIMIT in Postgres and MySql, TOP in SQL Server and FETCH FIRST in DB2.
SELECT rownum, table_name
FROM user_tables
WHERE rownum <=3;
ROWNUM TABLE_NAME
————- —————–
1 EMP
2 DEPT
3 BONUS
3 rows selected
ROWNUM with DML
The use of ROWNUM is not restricted to select statements. It can be used with DML statements that update the database too.
CREATE TABLE o AS
SELECT *
FROM all_objects
WHERE rownum <= 1000;
Table created
UPDATE o
SET object_id = rownum,
created = created + INTERVAL '1' MINUTE * rownum
WHERE rownum 2;
RNUM TABLE_NAME
——– —————-
3 SALGRADE
4 DUMMY
5 DEPT
3 rows selected
You will notice that an inline view has been introduced to transform the ROWNUM pseudo column into a ‘real’ column before we do the comparison.
It is tempting to write the above SQL as follows.
SELECT table_name
FROM user_tables
WHERE rownum > 2;
TABLE_NAME
——————————
0 rows selected
However, this query will always return zero rows, regardless of the number of rows in the table.
To explain this behaviour, we need to understand how Oracle processes ROWNUM. When assigning ROWNUM to a row, Oracle starts at 1 and only only increments the value when a row is selected; that is, when all conditions in the WHERE clause are met. Since our condition requires that ROWNUM is greater than 2, no rows are selected and ROWNUM is never incremented beyond 1.
The bottom line is that conditions such as the following will work as expected.
.. WHERE rownum = 1;
.. WHERE rownum 10;
Top-n Query
Typically, a top-n query sorts data into the required sequence and then limits the output to a subset of rows.
For example, suppose we wish to retrieve the top three earners from our employee table.
SELECT ename, sal
FROM (
SELECT ename, sal
FROM emp
ORDER BY sal DESC)
WHERE rownum <=3;
ENAME SAL
———- ———
KING 5000
SCOTT 3000
FORD 3000
3 rows selected
The inline view (the inner select) sorts the rows and passes the result up to the outer select. The outer select then limits the output to three rows.
It may seem more natural to use the following SQL.
SELECT ename, sal
FROM emp
WHERE rownum <=3
ORDER BY sal DESC;
ENAME SAL
———- ———————-
ALLEN 1600
WARD 1250
SMITH 800
3 rows selected
However, this does not give us the result we want because Oracle assigns the ROWNUM values to the rows before it does the sort.
In this example, Oracle will retrieve three rows from the table, any three rows, and sort only these three rows. We really need Oracle to sort all the rows and then return the first three. The inline view will ensure that this will happen.
Sort Performance
Limiting rows on a sorted result set using ROWNUM can also provide an added performance benefit. Rather than physically sorting all the rows to retrieve just the top few, Oracle maintains an array which contains just the highest or the lowest values (depending on whether we specified ASC or DESC in the ORDER BY clause). The size of the array will be the number of rows we wish to return. As rows are processed, only the highest (or lowest) values are retained in the array. All other rows are discarded.
Pagination
Next, we will see how ROWNUM is used to select a range of rows from within a result set. This is useful if we are to provide pagination on a web screen, for example.
Suppose we are paging through the employee table in name order and we wish to display rows six to ten inclusive.
SELECT rnum, ename, job
FROM
(SELECT /*+ FIRST_ROWS(10) */ rownum rnum, ename, job
FROM
(SELECT ename, job
FROM emp
ORDER BY ename)
WHERE rownum 5;
RNUM ENAME JOB
——– ———- ———
6 JAMES CLERK
7 JONES MANAGER
8 KING PRESIDENT
9 MARTIN SALESMAN
10 MILLER CLERK
5 rows selected
We use nested inline views to retrieve and sort the data and then apply the range check using ROWNUM. We have split the upper and lower bound check, which allows Oracle to use COUNT(STOPKEY) in the execution plan when checking for ROWNUM <= 10. This is a performance optimization which, along with the sorting optimization described earlier, will ensure that our query runs efficiently as the table grows.
The FIRST_ROWS(n) hint also tells Oracle to optimize the query so that the first n rows are returned as quickly as possible.
Summary
ROWNUM provides a mechanism for returning a subset or range of rows from a query. It can be misleading at first if not properly understood but, once mastered, is invaluable for limiting result set output for pagination and top-n style queries.
For more information on ROWNUM, see Tom Kytes article on OTN.
For more information on Oracle, visit level up.
SELECT rownum, table_name
FROM user_tables;
ROWNUM TABLE_NAME
————- —————–
1 EMP
2 DEPT
3 BONUS
4 SALGRADE
5 DUMMY
5 rows selected
Here is a summary of how ROWNUM can be used.
Limiting Rows
ROWNUM can be used to limit the number of rows returned by a query in a similar way to LIMIT in Postgres and MySql, TOP in SQL Server and FETCH FIRST in DB2.
SELECT rownum, table_name
FROM user_tables
WHERE rownum <=3;
ROWNUM TABLE_NAME
————- —————–
1 EMP
2 DEPT
3 BONUS
3 rows selected
ROWNUM with DML
The use of ROWNUM is not restricted to select statements. It can be used with DML statements that update the database too.
CREATE TABLE o AS
SELECT *
FROM all_objects
WHERE rownum <= 1000;
Table created
UPDATE o
SET object_id = rownum,
created = created + INTERVAL '1' MINUTE * rownum
WHERE rownum 2;
RNUM TABLE_NAME
——– —————-
3 SALGRADE
4 DUMMY
5 DEPT
3 rows selected
You will notice that an inline view has been introduced to transform the ROWNUM pseudo column into a ‘real’ column before we do the comparison.
It is tempting to write the above SQL as follows.
SELECT table_name
FROM user_tables
WHERE rownum > 2;
TABLE_NAME
——————————
0 rows selected
However, this query will always return zero rows, regardless of the number of rows in the table.
To explain this behaviour, we need to understand how Oracle processes ROWNUM. When assigning ROWNUM to a row, Oracle starts at 1 and only only increments the value when a row is selected; that is, when all conditions in the WHERE clause are met. Since our condition requires that ROWNUM is greater than 2, no rows are selected and ROWNUM is never incremented beyond 1.
The bottom line is that conditions such as the following will work as expected.
.. WHERE rownum = 1;
.. WHERE rownum 10;
Top-n Query
Typically, a top-n query sorts data into the required sequence and then limits the output to a subset of rows.
For example, suppose we wish to retrieve the top three earners from our employee table.
SELECT ename, sal
FROM (
SELECT ename, sal
FROM emp
ORDER BY sal DESC)
WHERE rownum <=3;
ENAME SAL
———- ———
KING 5000
SCOTT 3000
FORD 3000
3 rows selected
The inline view (the inner select) sorts the rows and passes the result up to the outer select. The outer select then limits the output to three rows.
It may seem more natural to use the following SQL.
SELECT ename, sal
FROM emp
WHERE rownum <=3
ORDER BY sal DESC;
ENAME SAL
———- ———————-
ALLEN 1600
WARD 1250
SMITH 800
3 rows selected
However, this does not give us the result we want because Oracle assigns the ROWNUM values to the rows before it does the sort.
In this example, Oracle will retrieve three rows from the table, any three rows, and sort only these three rows. We really need Oracle to sort all the rows and then return the first three. The inline view will ensure that this will happen.
Sort Performance
Limiting rows on a sorted result set using ROWNUM can also provide an added performance benefit. Rather than physically sorting all the rows to retrieve just the top few, Oracle maintains an array which contains just the highest or the lowest values (depending on whether we specified ASC or DESC in the ORDER BY clause). The size of the array will be the number of rows we wish to return. As rows are processed, only the highest (or lowest) values are retained in the array. All other rows are discarded.
Pagination
Next, we will see how ROWNUM is used to select a range of rows from within a result set. This is useful if we are to provide pagination on a web screen, for example.
Suppose we are paging through the employee table in name order and we wish to display rows six to ten inclusive.
SELECT rnum, ename, job
FROM
(SELECT /*+ FIRST_ROWS(10) */ rownum rnum, ename, job
FROM
(SELECT ename, job
FROM emp
ORDER BY ename)
WHERE rownum 5;
RNUM ENAME JOB
——– ———- ———
6 JAMES CLERK
7 JONES MANAGER
8 KING PRESIDENT
9 MARTIN SALESMAN
10 MILLER CLERK
5 rows selected
We use nested inline views to retrieve and sort the data and then apply the range check using ROWNUM. We have split the upper and lower bound check, which allows Oracle to use COUNT(STOPKEY) in the execution plan when checking for ROWNUM <= 10. This is a performance optimization which, along with the sorting optimization described earlier, will ensure that our query runs efficiently as the table grows.
The FIRST_ROWS(n) hint also tells Oracle to optimize the query so that the first n rows are returned as quickly as possible.
Summary
ROWNUM provides a mechanism for returning a subset or range of rows from a query. It can be misleading at first if not properly understood but, once mastered, is invaluable for limiting result set output for pagination and top-n style queries.
For more information on ROWNUM, see Tom Kytes article on OTN.
For more information on Oracle, visit level up.
Why SEO doesn’t work?
Many webmasters face the problem that their SEO campaigns don’t deliver the expected results. Why are your campaigns under performing? What can you do to make sure that search engine optimization works for you?
There can be several reasons why your SEO isn’t a success:
Wrong Goals
If your website doesn’t have many high rankings yet then you cannot expect that Google will display your site on the first result page for keywords such as “mp3″ or other very competitive one-word keywords.
You have to start with more targeted key phrases first. Optimize your pages for many different keywords with lower competition. The more high rankings your website has for keywords with lower competition, the more likely it is that your website will also get high rankings for more competitive keywords that belong to the same topic.
It’s like running a marathon. You have to run smaller distances first before you can run the full 26 miles and 385 yards.
Don’t Take SEO Seriously
Search engine optimization isn’t set-and-forget. It takes some time to make things happen. Search engine optimization is an investment into your company and it should be treated like that.
If all you do to ‘promote’ your website is to submit it to search engines then you won’t be successful. You have to invest time and effort into the optimization of your site. Tools can help you to save a lot of this time and effort but you still have to work with your site.
Focus Wrong Elements
Some webmasters are obsessed with the length of the title tag. Others submit their website every few days to search engines. Other webmasters insist that a particular part of their website links must use the rel=nofollow attribute.
You don’t have to chase the latest search engine optimization trend. These trend topics usually make the difference between position 8 and position 9. If your website isn’t listed on the first result page at all, you have to get the basics right.
The most important factors that will get your website on Google’s first result page are optimized web pages with good content with a tool and good back links with the IBP link improver.
Wrong Keywords
This is an extremely common mistake that many webmasters make. If you choose the wrong keywords, you will waste a lot of time and money.
The best keywords for your website are not the keywords with the biggest search volume. The best keywords also aren’t the keywords that will boost your ego and it’s also not the “obvious” keywords that will work best for SEO.
The best keywords for SEO are the keywords that deliver targeted visitors who will buy. It does not matter if a keyword has thousands of searches. If none of the visitors who find your site through that keyword will buy, then this keyword won’t do you any good.
Wrong Links
To get high rankings on Google, your website must have good back links. Automatic links from link building schemes don’t work. Actually, that kind of links can even get you in trouble with Google.
You must get the right kind of back links to succeed. Use professional link management tools and consider purchasing text links from a quality site.
Summary
Search engine optimization can contribute greatly to the success of your website. It’s important that you do the right things in the right order and that you focus on the right elements. If you can tick all boxes in the checklist, your website is ready to get top 10 rankings on Google for your most important keywords.
There can be several reasons why your SEO isn’t a success:
Wrong Goals
If your website doesn’t have many high rankings yet then you cannot expect that Google will display your site on the first result page for keywords such as “mp3″ or other very competitive one-word keywords.
You have to start with more targeted key phrases first. Optimize your pages for many different keywords with lower competition. The more high rankings your website has for keywords with lower competition, the more likely it is that your website will also get high rankings for more competitive keywords that belong to the same topic.
It’s like running a marathon. You have to run smaller distances first before you can run the full 26 miles and 385 yards.
Don’t Take SEO Seriously
Search engine optimization isn’t set-and-forget. It takes some time to make things happen. Search engine optimization is an investment into your company and it should be treated like that.
If all you do to ‘promote’ your website is to submit it to search engines then you won’t be successful. You have to invest time and effort into the optimization of your site. Tools can help you to save a lot of this time and effort but you still have to work with your site.
Focus Wrong Elements
Some webmasters are obsessed with the length of the title tag. Others submit their website every few days to search engines. Other webmasters insist that a particular part of their website links must use the rel=nofollow attribute.
You don’t have to chase the latest search engine optimization trend. These trend topics usually make the difference between position 8 and position 9. If your website isn’t listed on the first result page at all, you have to get the basics right.
The most important factors that will get your website on Google’s first result page are optimized web pages with good content with a tool and good back links with the IBP link improver.
Wrong Keywords
This is an extremely common mistake that many webmasters make. If you choose the wrong keywords, you will waste a lot of time and money.
The best keywords for your website are not the keywords with the biggest search volume. The best keywords also aren’t the keywords that will boost your ego and it’s also not the “obvious” keywords that will work best for SEO.
The best keywords for SEO are the keywords that deliver targeted visitors who will buy. It does not matter if a keyword has thousands of searches. If none of the visitors who find your site through that keyword will buy, then this keyword won’t do you any good.
Wrong Links
To get high rankings on Google, your website must have good back links. Automatic links from link building schemes don’t work. Actually, that kind of links can even get you in trouble with Google.
You must get the right kind of back links to succeed. Use professional link management tools and consider purchasing text links from a quality site.
Summary
Search engine optimization can contribute greatly to the success of your website. It’s important that you do the right things in the right order and that you focus on the right elements. If you can tick all boxes in the checklist, your website is ready to get top 10 rankings on Google for your most important keywords.
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