Services: New method channel/GetAvailableChanid

The service that adds a channel requires a chanid but there is no method of obtaining an unused chanid number. This method returns the next available number.
MythTV · Feb 22, 2023 · 293adf2 · 293adf2
1 parent 659a9b6
commit 293adf2
Show file tree

Hide file tree

Showing 2 changed files with 21 additions and 0 deletions.
diff --git a/mythtv/programs/mythbackend/servicesv2/v2channel.cpp b/mythtv/programs/mythbackend/servicesv2/v2channel.cpp
@@ -283,6 +283,24 @@ bool V2Channel::UpdateDBChannel( uint          MplexID,
     return bResult;
 }
 
+
+uint V2Channel::GetAvailableChanid ( void ) {
+    uint chanId = 0;
+
+    MSqlQuery query(MSqlQuery::InitCon());
+    query.prepare("SELECT MAX(chanid) FROM channel");
+    if (!query.exec())
+    {
+        MythDB::DBError("V2Channel::AddDBChannel", query);
+        throw( QString( "Database Error executing query." ));
+    }
+    if (query.next())
+        chanId = query.value(0).toUInt() + 1;
+    if (chanId < 1000)
+        chanId = 1000;
+    return chanId;
+}
+
 bool V2Channel::AddDBChannel( uint          MplexID,
                             uint          SourceID,
                             uint          ChannelID,

diff --git a/mythtv/programs/mythbackend/servicesv2/v2channel.h b/mythtv/programs/mythbackend/servicesv2/v2channel.h
@@ -50,6 +50,7 @@ class V2Channel : public MythHTTPService
     Q_CLASSINFO("RemoveAllVideoSources",  "methods=POST;name=bool")
     Q_CLASSINFO("RemoveVideoSource",      "methods=POST;name=bool")
     Q_CLASSINFO("FetchChannelsFromSource","methods=GET,POST;name=int")
+    Q_CLASSINFO("GetAvailableChanid",     "methods=GET,POST;name=int")
     Q_CLASSINFO("GetXMLTVIdList",         "methods=GET,POST,HEAD;name=StringList")
 
     public:
@@ -119,6 +120,8 @@ class V2Channel : public MythHTTPService
 
         static bool            RemoveDBChannel     ( uint          ChannelID );
 
+        static uint           GetAvailableChanid   ( void );
+
         static V2CommMethodList* GetCommMethodList  ( void );
 
         /* Video Source Methods */