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Why does this if statement succeed?


By : Thành Lê Tiến
Date : October 16 2020, 06:10 AM
should help you out The stuff in the parentheses is an expression that evaluates to a single value:
code :
>>> "if" and ":" and " "
' '
>>> _ in "( )"
True
>>> ' ' in "( )"
True
>>> ("if" and ":" and " ") == ' '
True
>>> 0 and 0
0
>>> 0 and 1
0
>>> 1 and 0
0
>>> 1 and 1
1
>>> 0 and 'hello'
0
>>> 'hello' and 0
0
>>> 'hello' and 'hello'
'hello'  # WAIT. That's illegal!


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Why does this SQL injection succeed even though the SQL statement produces a syntax error?


By : Sukumar Budaguntla
Date : March 29 2020, 07:55 AM
To fix this issue The queries are still run because mysql uses ; to delimit each query and it will continue running the queries even when there is a syntax error if you allow it to do so. Running the queries in SequelPro I get a message about the syntax error and it prompts me if I want to continue running all queries or stop. However, running them straight in MySQL commandline the queries continue running and MySQL just gives an error message and continues to the next query as expected (same thing that happens with the PHP code).

How do I verify a DELETE statement succeed in MySQL with PHP?


By : Amit Kumar
Date : March 29 2020, 07:55 AM
will help you How do I verify a DELETE statement succeed in MySQL with PHP? See the area with the comment. , Results must return true and then use $stmt->affected_rows
code :
if ($stmt = $db->prepare($query)) 
    {
        $stmt->bind_param('i', $useid);
        $result_del=$stmt->execute();
        if($result_del){
           printf("rows deleted: %d\n", $stmt->affected_rows);
        }

        // did DELETE call succeed and not error out?

        $stmt->close();
    }

How do I get classList to succeed in place of className in my if statement in Javascript?


By : Parth
Date : March 29 2020, 07:55 AM
Does that help Using Node.contains on a string or array is not what it was meant to do, however; taking your function you can make it work that way.
Consider the following "prototype upgrade" - place at the beginning of your JS code, it provides the functionality globally:
code :
Object.defineProperty(String.prototype,'contains',{enumerable:false, configurable:false, writable:false, value:function(find)
{
    return ((' '+this+' ').indexOf(' '+find+' ') > -1);
}});
someNode.className.contains('foo'); // returns a boolean
Object.defineProperty(Element.prototype,'hasClass',{enumerable:false, configurable:false, writable:false, value:function(name)
{
    return ((' '+this.className+' ').indexOf(' '+name+' ') > -1);
}});
someNode.hasClass('foo');

Conditional EXEC dbo statement. Force error if exists, else succeed


By : user2250328
Date : March 29 2020, 07:55 AM
To fix the issue you can do The following code will help you. You may need to change the code for your required action. First, you need to create a Stored Procedure:
code :
CREATE PROCEDURE YourProc
    AS
BEGIN
DECLARE @ErrMsg NVARCHAR(MAX), @ErrSeverity INT
SET XACT_ABORT OFF
BEGIN TRY
    IF EXISTS (
        SELECT *
        FROM msdb.dbo.sysjobs_view job  
        INNER JOIN msdb.dbo.sysjobactivity activity 
            ON job.job_id = activity.job_id 
        WHERE activity.run_Requested_date IS NOT NULL  
          AND activity.stop_execution_date IS NULL) 
    BEGIN
        SELECT  @ErrMsg = 'There is a Job already running',
                @ErrSeverity = 1;
        RAISERROR (@ErrMsg, @ErrSeverity, 1);
    END
    ELSE
        PRINT 'No Jobs running'
END TRY

BEGIN CATCH
    SELECT  @ErrMsg = ERROR_MESSAGE(),
            @ErrSeverity = ERROR_SEVERITY();
    RAISERROR (@ErrMsg, @ErrSeverity, 1);
END CATCH
END
EXEC YourProc

Why does this if statement succeed with a non-boolean value?


By : BrightonGuy
Date : March 29 2020, 07:55 AM
this one helps. You should read about truthy values (MDN).
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