string-handling.md

String Handling

Many .Net string operations are supported by N1QL, and can be used directly in your LINQ queries.

Supported String Operations

• Length property
• Character index (i.e. str[2])
• ToUpper() and ToLower()
• String concatenation, using String.Concat(...) or the + operator
• Trim(), Trim(char[]), TrimStart(), and TrimEnd()
• Substring(startIndex) and Substring(startIndex, length)
• IndexOf(char) and IndexOf(string)
• Split() and Split(char)
• Replace(oldValue, newValue)

String Comparisons

String equality comparisons can be performed using the == and != operators.

var context = new BucketContext(bucket);

var query = from beer in context.Query<Beer>()
            where beer.Name == "21A IPA"
            select beer;

await foreach (var doc in query.AsAsyncEnumerable()) {
    // do work
    // query will return beers with the name 21A IPA
}

For other string comparison types, you may use String.Compare. The most readable method is to compare the two strings, then always compare the result to zero.

var context = new BucketContext(bucket);

var query = from beer in context.Query<Beer>()
            where String.Compare(beer.Name, "21A IPA") > 0
            select beer;

foreach (var doc in query) {
    // do work
    // query will return beers with a name greater than, but not equal to, 21A IPA
}

If you use this format, then the comparison operator before the zero is always the same as the comparison you're using for the strings.

:info: Note: Any call to String.Compare within a query must be combined with a comparison to either -1, 0, or 1. Any other usage will throw an exception.