Fix compilation with gcc

src/library/sqlrow.cpp

@@ -1,9 +1,18 @@
+#include "libraryquery.h"
 #include "sqlrow.h"
 
 #include <QSqlQuery>
 #include <QSqlRecord>
 
 SqlRow::SqlRow(const QSqlQuery& query) {
+  Init(query);
+}
+
+SqlRow::SqlRow(const LibraryQuery& query) {
+  Init(query);
+}
+
+void SqlRow::Init(const QSqlQuery& query) {
   int rows = query.record().count();
   for (int i = 0; i < rows; ++i) {
     columns_ << query.value(i);

src/library/sqlrow.h

@@ -6,16 +6,21 @@
 
 class QSqlQuery;
 
+class LibraryQuery;
+
 class SqlRow {
  public:
   // WARNING: Implicit construction from QSqlQuery and LibraryQuery.
   SqlRow(const QSqlQuery& query);
+  SqlRow(const LibraryQuery& query);
 
   QVariant value(int i) const { return columns_[i]; }
 
  private:
   SqlRow();
 
+  void Init(const QSqlQuery& query);
+
   QList<QVariant> columns_;
 };