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Update SQL query

Posted on 2003-11-17
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Last Modified: 2010-04-05

I'm using Delphi 5 with MS SQL and am trying to execute a update SQL query.  Mostly I have been updating integer fields which has been no problem, but now I want to update a string field, which is causing me problems because of the single quotes needed in the SQL.

EG

AdoCommand.CommandText := 'update customer set CustomerType = 'text' where rec = 99;

Obvisouly the problem here is that the 'text' must be in single quotes (or somthing similar) but also the SQL stmt must be in single quotes as well  (or something similar)

However I don't know what the something similar must be.

Simple I know, but I'm really stumped as to that I should use.

Thaniks
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Question by:dealclick
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6 Comments
 
LVL 5

Expert Comment

by:Darth_helge
ID: 9762803
AdoCommand.CommandText := 'update customer set CustomerType = ''text'' where rec = 99';

two single quotes in a row before and after the text-string.
this should do the trick :=)

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LVL 5

Expert Comment

by:Darth_helge
ID: 9762808
if the string is stored in a variable s do this:

AdoCommand.CommandText := 'update customer set CustomerType = ''' + s + ''' where rec = 99';
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LVL 27

Accepted Solution

by:
kretzschmar earned 50 total points
ID: 9762881
delphi provides a quotedstr-function

AdoCommand.CommandText := 'update customer set CustomerType = '+quotedstr(text)+' where rec = 99';

meikl ;-)

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LVL 27

Expert Comment

by:kretzschmar
ID: 9762894
but better would be to use a parameter like

AdoCommand.CommandText := 'update customer set CustomerType = :1 where rec = 99';
AdoCommand.Parameters[0].AsString := 'text';


not tested

meikl ;-)

0
 

Author Comment

by:dealclick
ID: 9762996

Thanks meikl, I've used the first solution cause it matches my simple mind, but accept that the param would maybe be a better way to go.

;-)
0
 
LVL 27

Expert Comment

by:kretzschmar
ID: 9763049
glad you got it work :-))

for Darth_helge,

i posted a q for you,
because your suggestion are also correct

meikl ;-)
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