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QuestionTo me this error msg is very cryptic! I am using VS2017 with MS Excel 2007 Pin
Greg Gonzales8-Jul-19 11:43
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AnswerRe: To me this error msg is very cryptic! I am using VS2017 with MS Excel 2007 Pin
Dave Kreskowiak8-Jul-19 11:54
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GeneralRe: To me this error msg is very cryptic! I am using VS2017 with MS Excel 2007 Pin
Greg Gonzales8-Jul-19 17:09
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Questionhelp Pin
Member 145235257-Jul-19 13:40
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AnswerRe: help Pin
Mycroft Holmes7-Jul-19 17:48
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GeneralRe: help Pin
OriginalGriff7-Jul-19 18:46
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Member 145235257-Jul-19 21:49
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GeneralRe: help Pin
OriginalGriff7-Jul-19 22:09
protectorOriginalGriff7-Jul-19 22:09 
Quote:
read up on sql injection attacks as you are inviting someone to destroy your database.

What that means is this: never concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Always use Parameterized queries instead.

When you concatenate strings, you cause problems because SQL receives commands like:
SELECT * FROM MyTable WHERE StreetAddress = 'Baker's Wood'
The quote the user added terminates the string as far as SQL is concerned and you get problems. But it could be worse. If I come along and type this instead: "x';DROP TABLE MyTable;--" Then SQL receives a very different command:
SELECT * FROM MyTable WHERE StreetAddress = 'x';DROP TABLE MyTable;--'
Which SQL sees as three separate commands:
SELECT * FROM MyTable WHERE StreetAddress = 'x';
A perfectly valid SELECT
DROP TABLE MyTable;
A perfectly valid "delete the table" command
--'
And everything else is a comment.
So it does: selects any matching rows, deletes the table from the DB, and ignores anything else.

So ALWAYS use parameterized queries! Or be prepared to restore your DB from backup frequently. You do take backups regularly, don't you?
Sent from my Amstrad PC 1640
Never throw anything away, Griff
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
AntiTwitter: @DalekDave is now a follower!

GeneralRe: help Pin
Member 145235257-Jul-19 21:50
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OriginalGriff7-Jul-19 22:14
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CHill608-Jul-19 2:17
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Mycroft Holmes8-Jul-19 11:26
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QuestionZKTeco with C# Pin
Member 142231355-Jul-19 20:01
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AnswerRe: ZKTeco with C# Pin
OriginalGriff5-Jul-19 20:18
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BillWoodruff6-Jul-19 20:53
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BillWoodruff6-Jul-19 20:50
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QuestionC# LINQ JOIN: Getting out of memory exception Pin
Mou_kol5-Jul-19 10:03
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AnswerRe: C# LINQ JOIN: Getting out of memory exception Pin
Mycroft Holmes5-Jul-19 13:28
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Mou_kol8-Jul-19 5:53
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GeneralRe: C# LINQ JOIN: Getting out of memory exception Pin
Dave Kreskowiak8-Jul-19 6:27
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GeneralRe: C# LINQ JOIN: Getting out of memory exception Pin
Eddy Vluggen8-Jul-19 8:22
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GeneralRe: C# LINQ JOIN: Getting out of memory exception Pin
Gerry Schmitz8-Jul-19 10:50
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GeneralRe: C# LINQ JOIN: Getting out of memory exception Pin
Mycroft Holmes8-Jul-19 11:31
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AnswerRe: C# LINQ JOIN: Getting out of memory exception Pin
Dave Kreskowiak5-Jul-19 18:55
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AnswerRe: C# LINQ JOIN: Getting out of memory exception Pin
lmoelleb9-Jul-19 22:42
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