[sql] Test helpers to ease testing of simple queries.

sql/test/test_helpers.cc

Index: sql/test/test_helpers.cc
diff --git a/sql/test/test_helpers.cc b/sql/test/test_helpers.cc
index 7c21aea9fa6926db843c3e7ebfeae3bfd6e32e3b..0e32164acdc782ca32927ee20c438a1ffbaa3387 100644
--- a/sql/test/test_helpers.cc
+++ b/sql/test/test_helpers.cc
@@ -270,5 +270,28 @@ std::string IntegrityCheck(sql::Connection* db) {
   return statement.ColumnString(0);
 }
 
+std::string ExecuteWithResult(sql::Connection* db, const char* sql) {
+  sql::Statement s(db->GetUniqueStatement(sql));
+  return s.Step() ? s.ColumnString(0) : std::string();
+}
+
+std::string ExecuteWithResults(sql::Connection* db,
+                               const char* sql,
+                               const char* column_sep,
+                               const char* row_sep) {
+  sql::Statement s(db->GetUniqueStatement(sql));
+  std::string ret;
+  while (s.Step()) {
+    if (!ret.empty())
+      ret += row_sep;
+    for (int i = 0; i < s.ColumnCount(); ++i) {
+      if (i > 0)
+        ret += column_sep;
+      ret += s.ColumnString(i);
+    }
+  }
+  return ret;
+}
+
 }  // namespace test
 }  // namespace sql