How can I convert a String to Integer

[Gavriel Fleischer]

Hi,

I have a String field that contains data like: "1;2;3". I built the DSL statement that gets the "2nd subfield" from this string ("2"), but it's still a String, and I need to convert it to  Integer. How can I do this?

final Field<Integer> status = decode().when(TABLE.EVENTID.eq("vp1s"), CsvSplitter.getCsvField(STATISTICSDAILYSUMMARY.EVENTVALUE, ";", 1).HOW_CAN_I_CONVERT_IT_TO_INTEGER?).otherwise(0);

public class CsvSplitter {
    public static Field<String> getCsvField(Field<String> field, String delimiter, int pos);
}

[Lukas Eder]

Have you tried anything so far? Where did your attempts fail?

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[Gavriel Fleischer]

I failed to find the correct function to use, but now I found cast(), and it seems to work so far.

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[Lukas Eder]

I'm sorry, it was a misunderstanding on my part. I thought you were looking for the implementation of getCsvField() when you were really looking for a replacement for the placeholder HOW_CAN_I_CONVERT_IT_TO_INTEGER?

Yes, DSL.cast() or Field.cast() are one way to do that in the database. If you want to take advantage of a vendor-specific conversion function, you can also resort to plain SQL in order to add support for that:

http://www.jooq.org/doc/latest/manual/sql-building/plain-sql/

For instance, if this is about MySQL (http://dev.mysql.com/doc/refman/5.0/en/cast-functions.html#function_convert), you could be using:

public static Field<Integer> convertToSigned(Field<String> field) {

    return DSL.field("convert({0}, signed)", Integer.class, field);

}

But I don't think it will be any different from using cast(), and jOOQ ensures that cast() works in all SQL dialects.

Cheers,

Lukas