Question

I have the following query that selects some records from the database:

$select_person = $this->select()
        ->setIntegrityCheck(false)
        ->from(array('a' => 'tableA'), 
                array(new Zend_Db_Expr('SQL_CALC_FOUND_ROWS a.id'),
                        'a.cid',  
                        'a.email',
                        'final' => new Zend_Db_Expr( "concat( '<div 
                            style=\"color:#1569C7; font-weight:bold\">',
                            a.head , ' ' ,  a.tail,  '</div>')" ),
                        'a.red_flag'
                )
        )   
        ->joinLeft(array('b' => 'tableb'), ... blah blah)
        ->where('blah blah')
        ->order('a.head ASC')

I want to modify the above query so that it selects a different value for 'final' depending on the value of

a.red_flag.

which can have values – true or false.

I understand I can use the CASE statement of mysql – eg something like the following:

'final' => new Zend_Db_Expr("CASE a.red_flag WHEN 'true' THEN '$concatstr1'
                        ELSE '$concatstr2' END")

The value of $concatstr1 = "concat( '<div style=\"color:red; font-weight:bold\">', a.head , ' ' , a.tail, '</div>')" ;

The value of $concatstr2 = "concat( '<div style=\"color:blue; font-weight:bold\">', a.head , ' ' , a.tail, '</div>')" ;

However, it throws an error saying

Message: SQLSTATE[42000]: Syntax error or access violation: 1064
You have an error in your SQL syntax; check the manual that
corresponds to your MySQL server version for the right syntax to use
near ‘div
style=”color:red; font-weight:bold”>’,
a.head , ‘ ‘ , ‘ at line 1

How can I make this query work?
Any help is greatly appreciated.

Thanks

Answer 1

Finally, I found the error in my statement.
The culprit was – I was using quotes in $concatstr1 and $concatstr2 inside the $select_person statement.
The correct query should be formed as follows:

$select_person = $this->select()
        ->setIntegrityCheck(false)
        ->from(array('a' => 'tableA'), 
                array(new Zend_Db_Expr('SQL_CALC_FOUND_ROWS a.id'),
                        'a.cid',  
                        'a.email',
                        final' => new Zend_Db_Expr("CASE a.red_flag WHEN 'true' THEN $concatstr1 ELSE $concatstr2 END"),
                        'a.red_flag'
                )
        )   
        ->joinLeft(array('b' => 'tableb'), ... blah blah)
        ->where('blah blah')
        ->order('a.head ASC');

This is now returning me the appropriate value of ‘final‘ – concatstr1 when red_flag is true otherwise it is returning me concatstr2.