Allow the execution of multiple commands after the IRC connection

fix #3275

src/database/delete_query.hpp

@@ -0,0 +1,33 @@
+#pragma once
+
+#include <database/query.hpp>
+#include <database/engine.hpp>
+
+class DeleteQuery: public Query
+{
+public:
+  DeleteQuery(const std::string& name):
+      Query("DELETE")
+  {
+    this->body += " from " + name;
+  }
+
+  DeleteQuery& where()
+  {
+    this->body += " WHERE ";
+    return *this;
+  };
+
+  void execute(DatabaseEngine& db)
+  {
+    auto statement = db.prepare(this->body);
+    if (!statement)
+      return;
+#ifdef DEBUG_SQL_QUERIES
+    const auto timer = this->log_and_time();
+#endif
+    statement->bind(std::move(this->params));
+    if (statement->step() != StepResult::Done)
+      log_error("Failed to execute DELETE command");
+  }
+};