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Added a way to check if a row has a value for a column #654

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Added a way to check if a row has a value for a column #654

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12 changes: 12 additions & 0 deletions Sources/SQLite/Typed/Query.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -1062,6 +1062,18 @@ public struct Row {
return valueAtIndex(idx)
}

/// Checks if the row has a value for the given column.
///
/// - Parameter column: An expression representing a column selected in a Query.
///
/// - Returns: True if the row has a value for the given column.
public func hasColumn<V: Value>(_ column: Expression<V>) -> Bool {
return hasColumn(Expression<V?>(column))
}
public func hasColumn<V: Value>(_ column: Expression<V?>) -> Bool {
return (columnNames[column.template] != nil)
}

// FIXME: rdar://problem/18673897 // subscript<T>…

public subscript(column: Expression<Blob>) -> Blob {
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