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Editorial Team
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Asked: 2026-06-11T16:54:53+00:00

I’m wondering if anyone has any clarification on the difference between the following statements

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I’m wondering if anyone has any clarification on the difference between the following statements using sqlite3 gem with ruby 1.9.x:

@db.execute("INSERT INTO table(a,b,c) VALUES (?,?,?)", 
some_int, other_int, some_string)

and 

@db.execute("INSERT INTO table(a,b,c) VALUES (#{some_int},"+ 
+"#{some_int}, #{some_string})")

My problem is: When I use the first method for insertion, I can’t query for the “c” column using the following statement: 

SELECT * FROM table WHERE c='some magic value'

I can use this: 

"SELECT * FROM table WHERE c=?", "some magic value"

but what I really want to use is 

"SELECT * FROM table WHERE c IN ('#{options.join("','")}')"

And this doesn’t work with the type of inserts.

Does anyone know what the difference is at the database level that is preventing the IN from working properly?

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1 Answer

  1. Editorial Team

    I figured this out quite a while ago, but forgot to come back and point it out, in case someone finds this question at another time.

    The difference turns out to be blobs. Apparently when you use the first form above (the substitution method using (?,?)) SQLite3 uses blogs to enter the data. However, if you construct an ordinary SQL statement, it’s inserted as a regular string and the two aren’t equivalent.

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