Add field methods to Table class

common/table.cpp

@@ -83,6 +83,61 @@ void Table::del(std::string key, std::string /* op */)
                            "DEL operation failed");
 }
 
+std::string Table::getField(std::string key, std::string field)
+{
+    std::string value;
+
+    if (tryGetField(key, field, value))
+    {
+        return value;
+    }
+
+    throw system_error(make_error_code(errc::io_error),
+                       "HGET operation failed");
+}
+
+bool Table::tryGetField(std::string key, std::string field, std::string &value)
+{
+    redisReply *reply = (redisReply*)redisCommand(
+            m_db->getContext(),
+            "HGET %s %s",
+            getKeyName(key).c_str(),
+            field.c_str());
+
+    if (reply->type != REDIS_REPLY_STRING)
+    {
+        freeReplyObject(reply);
+        return false;
+    }
+
+    value = std::string(reply->str);
+
+    freeReplyObject(reply);
+
+    return true;
+}
+
+void Table::setField(std::string key, std::string field, std::string value)
+{
+    FieldValueTuple entry(field, value);
+
+    std::vector<FieldValueTuple> values { entry };
+
+    set(key, values);
+}
+
+void Table::delField(std::string key, std::string field)
+{
+    RedisReply r(m_db, string("HDEL ") + getKeyName(key) + " " + field, REDIS_REPLY_INTEGER);
+    if (r.getContext()->type != REDIS_REPLY_INTEGER)
+        throw system_error(make_error_code(errc::io_error),
+                           "DEL operation failed");
+}
+
+Table::~Table()
+{
+}
+
 void Table::multi()
 {
     while (!m_expectedResults.empty())

common/table.h

@@ -33,6 +33,13 @@ class Table {
     /* Delete an entry in the DB directly (op not in used) */
     virtual void del(std::string key, std::string op = "");
 
+    std::string getField(std::string key, std::string field);
+    bool tryGetField(std::string key, std::string field, std::string &value);
+    void setField(std::string key, std::string field, std::string value);
+    void delField(std::string key, std::string field);
+
+    virtual ~Table();
+
 protected:
     /* Return the actual key name as a comibation of tableName:key */
     std::string getKeyName(std::string key);