Database handler check if email exists in freelancer table

src/database.cpp

@@ -49,6 +49,12 @@ namespace Database {
     const static std::string PREPARED_STATEMENT_SELECT_FREELANCER_EMAIL = "selectFreelancerEmailAddress";
     const static std::string SQL_STATEMENT_SELECT_FREELANCER_EMAIL = "select emailaddress from freelancers where id = $1;";
 
+    /*
+     * Name and Statement for prepared statement to check if an email is already registered with a freelancer
+     */
+    const static std::string PREPARED_STATEMENT_SELECT_CHECK_EMAIL_EXISTS = "selectCheckEmailExists";
+    const static std::string SQL_STATEMENT_SELECT_CHECK_EMAIL_EXISTS = "select count(*) from freelancers where emailaddress = $1;";
+
     /*
      * Name and Statement for prepared statement to select a freelancer based on a given id
      */
@@ -307,6 +313,19 @@ namespace Database {
         return result;
     }
 
+
+    /*
+     * Executes the prepared statement SELECT_CHECK_EMAIL_EXISTS
+     * Takes an open pqxx::connection and the emailAddress to check
+     * Delivers count of emailaddress occurence 0 for none 1+ for more
+     */
+    pqxx::result executePreparedStatement_SELECT_CHECK_EMAIL_EXISTS(pqxx::connection &connection, std::string freelancerEmail) {
+        connection.prepare(PREPARED_STATEMENT_SELECT_CHECK_EMAIL_EXISTS, SQL_STATEMENT_SELECT_CHECK_EMAIL_EXISTS);
+        pqxx::work work(connection);
+        pqxx::result result = work.exec_prepared(PREPARED_STATEMENT_SELECT_CHECK_EMAIL_EXISTS, freelancerEmail);
+        work.commit();
+        return result;
+    }
     /*
      * Executes the prepared statement SELECT_TEMPLATE
      * Takes an open pqxx::connection and the id to select by