passing binary data to MySQL BLOB field

Peter Haworth pete at lcsql.com
Wed Mar 6 19:59:10 CST 2013


Bjornke,
How do you specify binary data if you use the an array instead of a list of
variable names?
Pete
lcSQL Software <http://www.lcsql.com>


On Tue, Mar 5, 2013 at 5:01 AM, Björnke von Gierke <bvg at mac.com> wrote:

> Not sure why it won't work for you, but it seems that your first try had
> some typo or otherwise wrong code. Your copy/paste has code missing so it's
> hard to say what the problem is. The second error looks like you forgot
> some closing brackets or quotation marks, again it's hard to tell due to
> lack of full code.  One thing to note is that all variables used for
> substitution have to exist, unlike all other places in LC, where missing
> variables are assumed to be empty. Here's an example that probably should
> work, but is untested:
>
> --assuming revopendatabase works as expected
> put "blah" into fileNameVar
> put "pretend this is binary" into binaryObjectVar
> revexecuteSQL MyDatabaseID, "INSERT INTO Assets ('FileName', 'File')
> VALUES(:1,:2)", "fileNameVar", "*bbinaryObjectVar"
>
> On 05.03.2013, at 02:26, Sieg Lindstrom wrote:
>
> > Can anyone advise what the correct syntax should be to construct a MySQL
> "INSERT" query that passes variables from LiveCode when one of said
> variables is a binary object? I am trying to construct the statement and
> then use it with RevExecuteSQL. I'm particularly trying to understand the
> LC Dictionary note that reads, "To pass binary data in a variable in the
> variablesList, prepend "*b" to the variable name. The revExecuteSQL command
> strips the binary marker "*b" and passes it to the database as binary data,
> rather than text data.
> >
> > Fair enough. My second variable in the query below, binaryObjectVar, is
> a binary object. So I try this:
> >
> > INSERT INTO Assets (`FileName`, `File`) VALUES(:1,:2)", "fileNameVar",
> "*bbinaryObjectVar"
> >
> > The result is this LC error: "compilation error at line 486 (Expression:
> double binary operator) near "*", char 24"
> >
> > If I try the query without using "*b" MySQL chokes on the binary data in
> binaryObjectVar and sends the following error message:
> >
> > "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
> ':1,:2,:3,:4)", "test_file.pdf", %PDF-1.5%...' at line 1"
> >
> > So I've tried a number of permutations for including "*b". I've tried
> quotes around the variable name with "*b" prepended within those quotes,
> "*b" prepended before the open quote, etc. In each case, MySQL still gags
> on the binary data.
> >
> > Help! While this may sound like a misplaced MySQL syntax question, it's
> not. What I'm missing is how to properly prepend "*b" so LC sends the
> variable as binary data. ???
> >
> > Thanks in advance,
> >
> > Sieg Lindstrom
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>
> --
>
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>
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