AMPLI-SYNC is a framework for synchronizing data between a Sqlite database and an MS SQL/MySQL/Oracle/PostgreSQL database. With this framework your application can work completely offline (Airplane Mode), then perform an automated Bidirectional Synchronization when an internet connection becomes available.
Home Page: https://ampliapps.com/sqlite-sync/
License: BSD 3-Clause "New" or "Revised" License
Hi,
I'm using the sqlite-sync in our project since 2018 with success.
Recently you released the 3.2.3 version, I tried to install but I cannot connect to MSSQL Server. the config file i s the same used for the 3.1.9 version:
DB_ENGINE = mssql
DBURL = jdbc:sqlserver://crt-sql01.crottiant.local:1433;databaseName=CrottiDB
DBUSER = crotti
DBPASS = xxxxxxx
DBDRIVER = com.microsoft.sqlserver.jdbc.SQLServerDriver
DATE_FORMAT = yyyy-MM-dd HH:mm:ss
HISTORY_DAYS = 30
LOG_LEVEL = 3
The config file change with 3.2.3 version?
Thanks.
G. Raccuia
Hello,
I'm developing an Android app synced with a MSSQL Server.
After adding tables and syncing, i'm encountering an issue because there is no null values in my SQLite database, all has been inserted as null strings. It happens with TEXT columns, but also INT, that causes conversion errors in my app.
Is there a setting to change that?
I have 2 databases with the same schemas that are stored on a local device. Differences in the amount of data in each table.
Is it possible to synchronize them using your product?
I found your demo project, but it sends data to a remote server (http://demo.sqlite-sync.com/sync.asmx).
The application could not be installed: INSTALL_FAILED_NO_MATCHING_ABIS
Installation failed due to: 'null'
For the later sdk versions of 27 or higher
Hi, I'm getting this error when I try to insert in the master db a new record that has an Identity primary key:
ERROR PushInsertRecords() Cannot insert explicit value for identity column in table 'Table' when IDENTITY_INSERT is set to OFF.
is an special configuration required??
Thanks
Is it safe to purge the files from these folders on a daily basis?
This is my request body, when I call send method, It gives me a internal server error
Request:
{
"subscriber": "1",
"content": "<SyncData xmlns="urn:sync-schema"><tab n="MergeIdentity"><tab n="reportsnew">",
"version": "3"
}
Response:
<!doctype html>
h2 {
font-family: Tahoma, Arial, sans-serif;
color: white;
background-color: #525D76;
font-size: 16px;
}
h3 {
font-family: Tahoma, Arial, sans-serif;
color: white;
background-color: #525D76;
font-size: 14px;
}
body {
font-family: Tahoma, Arial, sans-serif;
color: black;
background-color: white;
}
b {
font-family: Tahoma, Arial, sans-serif;
color: white;
background-color: #525D76;
}
p {
font-family: Tahoma, Arial, sans-serif;
background: white;
color: black;
font-size: 12px;
}
a {
color: black;
}
a.name {
color: black;
}
.line {
height: 1px;
background-color: #525D76;
border: none;
}
</style>
Type Exception Report
Message java.lang.NullPointerException
Description The server encountered an unexpected condition that prevented it from fulfilling the request.
Exception
javax.servlet.ServletException: java.lang.NullPointerException org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:489) org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:427) org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:388) org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:341) org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:228) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
Root Cause
java.lang.NullPointerException java.text.SimpleDateFormat.<init>(Unknown Source) java.text.SimpleDateFormat.<init>(Unknown Source) SQLiteSyncCore.SyncServer.Synchronization.SyncService.ParseStatmentParameter(SyncService.java:1307) SQLiteSyncCore.SyncServer.Synchronization.SyncService.PushUpdateRecords(SyncService.java:1157) SQLiteSyncCore.SyncServer.Synchronization.SyncService.PushTableData(SyncService.java:1007) SQLiteSyncCore.SyncServer.Synchronization.SyncService.CommitChangesToDb(SyncService.java:978) SQLiteSyncCore.SyncServer.Synchronization.SyncService.ReceiveData(SyncService.java:840) com.sqlitesync.ws.SyncAPI3.RecieveChanges(SyncAPI3.java:91) sun.reflect.GeneratedMethodAccessor40.invoke(Unknown Source) sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) java.lang.reflect.Method.invoke(Unknown Source) org.glassfish.jersey.server.model.internal.ResourceMethodInvocationHandlerFactory$1.invoke(ResourceMethodInvocationHandlerFactory.java:81) org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher$1.run(AbstractJavaResourceMethodDispatcher.java:144) org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.invoke(AbstractJavaResourceMethodDispatcher.java:161) org.glassfish.jersey.server.model.internal.JavaResourceMethodDispatcherProvider$VoidOutInvoker.doDispatch(JavaResourceMethodDispatcherProvider.java:143) org.glassfish.jersey.server.model.internal.AbstractJavaResourceMethodDispatcher.dispatch(AbstractJavaResourceMethodDispatcher.java:99) org.glassfish.jersey.server.model.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:389) org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:347) org.glassfish.jersey.server.model.ResourceMethodInvoker.apply(ResourceMethodInvoker.java:102) org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:326) org.glassfish.jersey.internal.Errors$1.call(Errors.java:271) org.glassfish.jersey.internal.Errors$1.call(Errors.java:267) org.glassfish.jersey.internal.Errors.process(Errors.java:315) org.glassfish.jersey.internal.Errors.process(Errors.java:297) org.glassfish.jersey.internal.Errors.process(Errors.java:267) org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317) org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:305) org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1154) org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:473) org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:427) org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:388) org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:341) org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:228) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
Note The full stack trace of the root cause is available in the server logs.
I want to sync data between an offline windows app (electron with angular) where data is stored on a local sqlite database (not in the browser) to a sql server db. Can this be done using ampli-sync?
how can i install it? (development on windows)
We ordered oracle version of sqlite-sync, but it has the MySQL version of the script "ADD_TABLE" named ORACLE_ADD_TABLE.sql. Where can we get the proper version of this script?
java program to sync my local database data into cloud.
When i save the record it should store in local data but when i connect to internet and should sink the data into server.
With the descriped setup tomcat is not able to write to amplisync home.
So no logs and syncData is created.
Im getting this error message in the mobile App
"Error while syncing databases!"
In my case I have 3 main table to sync.
Product-->always syncing from DB to App
Customer-->always syncing from DB to App
Orders<--just App creates new records and send to DB
Sometimes for instance Product's price changes. Some internal process update the table Product.
Next time the App sync get this error message:
"Error while syncing databases!"
Sync is not finished.
Sqlite-sync sometimes crashes.
If we restart maybe the next sync will work.
Hello,
First thank you for that tool that is so useful.
I tried it on versions 3.2.7 and 3.2.15.
I got an issue initializing a suscriber: the returned query contains an error.
In the mergeupdate trigger creation, there is :
"CREATE TRIGGER IF NOT EXISTS "trMergeUpdate_" AFTER UPDATE OF"
The "OF" create an error when the query is executed on the local database.
I fixed it removing the word after get the response from the server.
I followed the installation guide https://projects.ampliapps.com/projects/ampli-sync/wiki#Installation. This is quite difficult:
Finally I got the service running, although only with "root" id (not "tomcat").
Hey, Is there any working example for Xamarine.Forms and MySQL.
I am working on a project to sync data between MySQL database hosted on a web server and SQLite in Xamarin.Forms app. I need some references to start with. A working example will be appreciated.
Kindly let me know.
Regards
The content object I send to Server:
"<?xml version=\"1.0\" encoding=\"utf-8\"?><SyncData xmlns=\"urn:sync-schema\"><tab n=\"MergeIdentity\"><ins></ins><upd></upd></tab><tab n=\"person\"><ins><r><PersonID><![CDATA[6]]></PersonID><LastName><![CDATA[g]]></LastName><FirstName><![CDATA[b]]></FirstName><RowId><![CDATA[null]]></RowId></r></ins><upd></upd></tab><delete></delete></SyncData>"
subscriber id: 642661417
The log I found in 'sync.log':
2020-10-19 14:05:40,948 INFO Receiving data from subscriber 642661417
2020-10-19 14:05:40,971 ERROR CommitChangesToDb() ParseError at [row,col]:[1,1]
Message: Content is not allowed in prolog.
2020-10-19 14:05:40,975 INFO Finished receiving data from subscriber 642661417
2020-10-19 14:05:41,235 INFO Getting changes for subscriber 1 and table MergeIdentity
2020-10-19 14:05:41,247 TRACE select distinct * from ( select tb.*,1 as MergeContent_TableId, 1 as MergeContent_SubscriberId, tb.RowId as MergeContent_RowId, tb.RowVer as MergeContent_RowVer, t.ChangeDate as MergeContent_ChangeDate, -1 as MergeContent_Action, null as MergeContent_SyncId from `MergeIdentity` tb left join `MergeIdentity` vw on tb.RowId=vw.RowId left join `MergeContent_MergeIdentity` t on vw.RowId=t.RowId and t.SubscriberId=1 where (t.RowVer<>tb.RowVer or t.RowId is null) and vw.SubscriberId=1 union all select t.*,1 as MergeContent_TableId, 1 as MergeContent_SubscriberId, m.RowId as MergeContent_RowId, m.RowVer as MergeContent_RowVer, m.ChangeDate as MergeContent_ChangeDate, 3 as MergeContent_Action, null as MergeContent_SyncId from `MergeContent_MergeIdentity` m left join `MergeIdentity` vw on m.RowId=vw.RowId and m.SubscriberId=1 and vw.SubscriberId=1 left join `MergeIdentity` t on vw.RowId=t.RowId where vw.RowId is null and m.SubscriberId=1 ) as mergeVw
2020-10-19 14:05:41,259 TRACE [ {
"TableName" : "",
"Records" : "",
"QueryInsert" : "",
"QueryUpdate" : "",
"QueryDelete" : "",
"TriggerInsert" : "",
"TriggerUpdate" : "",
"TriggerDelete" : "",
"TriggerInsertDrop" : "",
"TriggerUpdateDrop" : "",
"TriggerDeleteDrop" : "",
"SyncId" : -1,
"SQLiteSyncVersion" : ""
} ]
2020-10-19 14:05:41,369 INFO Getting changes for subscriber 1 and table person
2020-10-19 14:05:41,381 TRACE select distinct * from ( select tb.*,2 as MergeContent_TableId, 1 as MergeContent_SubscriberId, tb.RowId as MergeContent_RowId, tb.RowVer as MergeContent_RowVer, t.ChangeDate as MergeContent_ChangeDate, -1 as MergeContent_Action, null as MergeContent_SyncId from `person` tb left join `person` vw on tb.RowId=vw.RowId left join `MergeContent_person` t on vw.RowId=t.RowId and t.SubscriberId=1 where (t.RowVer<>tb.RowVer or t.RowId is null) union all select t.*,2 as MergeContent_TableId, 1 as MergeContent_SubscriberId, m.RowId as MergeContent_RowId, m.RowVer as MergeContent_RowVer, m.ChangeDate as MergeContent_ChangeDate, 3 as MergeContent_Action, null as MergeContent_SyncId from `MergeContent_person` m left join `person` vw on m.RowId=vw.RowId and m.SubscriberId=1 left join `person` t on vw.RowId=t.RowId where vw.RowId is null and m.SubscriberId=1 ) as mergeVw
2020-10-19 14:05:41,392 TRACE [ {
"TableName" : "person",
"Records" : "<?xml version=\"1.0\" encoding=\"utf-8\"?><records><r a=\"1\"><c>1</c><c>q</c><c>y</c><c>2543d43a-11b3-11eb-819d-309c23bf0c2c</c></r><r a=\"1\"><c>2</c><c>w</c><c>i</c><c>2543dec8-11b3-11eb-819d-309c23bf0c2c</c></r><r a=\"1\"><c>3</c><c>e</c><c>p</c><c>2543dfb2-11b3-11eb-819d-309c23bf0c2c</c></r><r a=\"1\"><c>4</c><c>giao</c><c>1</c><c>2543e093-11b3-11eb-819d-309c23bf0c2c</c></r></records>",
"QueryInsert" : "INSERT INTO person ([PersonID],[LastName],[FirstName],[RowId]) VALUES (?,?,?,?);",
"QueryUpdate" : "UPDATE person set [LastName]=?,[FirstName]=?,[RowId]=? where PersonID=?;",
"QueryDelete" : "DELETE FROM person where RowId=",
"TriggerInsert" : "",
"TriggerUpdate" : " CREATE TRIGGER IF NOT EXISTS \"trMergeUpdate_person\" AFTER UPDATE OF [LastName],[FirstName] ON \"person\" BEGIN \tUPDATE \"person\" SET MergeUpdate = 1 WHERE RowId = old.RowId and RowId<>''; END; ",
"TriggerDelete" : " CREATE TRIGGER IF NOT EXISTS \"trMergeDelete_person\" AFTER DELETE ON \"person\" BEGIN \t \tINSERT INTO MergeDelete values (2, old.RowId); END; ",
"TriggerInsertDrop" : "DROP TRIGGER IF EXISTS \"trMergeInsert_person\"",
"TriggerUpdateDrop" : "DROP TRIGGER IF EXISTS \"trMergeUpdate_person\"",
"TriggerDeleteDrop" : "DROP TRIGGER IF EXISTS \"trMergeDelete_person\"",
"SyncId" : 21,
"SQLiteSyncVersion" : "3.2.16"
} ]
Please help!
Hello,
Do it support react native, I am creating one app in react native framework and i want it to be working with syncing process. Please let me know.
I want to build and offline first application which communicates to ORACLE bi-directionally.
Hi, I'm using the Ionic client provided in this repo.
As a database I'm usng SQL SERVER 2016.
The connection to the server works fine, and I'm able to add a table, initialise the client's database and hit the Sync endpoint to get data from the remote db.
Then I create some record on the client, and when I hit the Send endpoint, it looks like the data is not being sent.
I mean, I do send the XML payload and everything, and get a 204 response, it just doesn't recognise my local changes and thus the remote db doesn't receive the new data. I mean, in the XML payload, there's no trace of my local changes.
In the attempt to fix the issue, I added an auto-increment key to my table in the remote db.
At this point, when I hit the Sync endpoint, I get Error while syncing databases!.
I debugged the issue, and it's actually a column index out of range from SqLite.
I when to the bottom of it, this is what I found: basically, if my table has 4 columns, the Sync endpoint sends me 4 + 1 columns, where the extra one is RowId.
I'm not sure, at this point, whether it's a client or server issue. I'm just stuck and I don't know what to do.
Maybe someone has a clue?
Thanks in advance
[EDIT]
I've tried with the basic HTML5 and the C# client examples.
In both cases I can create new records locally but they are not sent to the server during the Send.
If I manually change the value of the MergeUpdate field to 1, it sends the new rows but they are not saved in the remote DB. I'm using the code provided by the examples, but 3 examples that behave the same makes me think I'm doing something wrong...
Will Ampli-sync work with a react-native or react project?
after hours trying to make it work with postgreSQL i did, and now i notice that there is no sql file to create the sync database ...
You have to remove the file
iOS/SQLiteSyncDemo/JSONModel/Info.plist.
INFO DoSync(). Table dbo.MergeDelete was not found in MergeTablesToSync.
Always have this message in sync.log
Not sure if it's normal
I tried the demo HTML5/SQLiteSyncDEMO HTML+jQuery/index.htm on MacOS 10.14.6 with Safari and Firefox and Chrome and on iPhone with MobileSafari. The results are disappointing:
Starting synchronization
Connecting to server...
Connected to server...
Creating object 00001 MergeDelete drop...
Creating object 00002 MergeDelete create...
Creating object 00003 MergeIdentity drop...
Creating object 00004 MergeIdentity...
Creating object 00005 MergeIdentity_Index...
Creating object 00006 Documents drop...
Creating object 00007 Documents...
Creating object 00008 Documents_MergeInsert...
Creating object 00009 Documents_MergeUpdate...
Creating object 00010 Documents_MergeDelete...
Creating object 00011 _Documents_PRIMARY...
Creating object 00012 _Documents_IX_Documents_AuthorId...
Creating object 00013 _Documents_IX_MERGE__Documents_RowId...
Creating object 00014 Documents_MergeUpdate_Index...
Synchronization completed
c) Synchronize() is blocked by CORS policy. Debugger output:
<b>Starting sending data</b>
2jquery-2.0.2.min.js:6 OPTIONS http://macmini:8080/SqliteSync-3.2.14/API3/Send 500
send @ jquery-2.0.2.min.js:6
ajax @ jquery-2.0.2.min.js:6
sqlitesync_SyncSendToServer @ sqlitesync.js:436
(anonymous) @ sqlitesync.js:426
SQLStatement (async)
sqlitesync_SyncSendTableDelete @ sqlitesync.js:411
(anonymous) @ sqlitesync.js:326
SQLStatement (async)
(anonymous) @ sqlitesync.js:300
SQLStatement (async)
(anonymous) @ sqlitesync.js:278
SQLStatement (async)
(anonymous) @ sqlitesync.js:261
SQLTransaction (async)
sqlitesync_SyncSendTable @ sqlitesync.js:260
(anonymous) @ sqlitesync.js:324
SQLStatement (async)
(anonymous) @ sqlitesync.js:300
SQLStatement (async)
(anonymous) @ sqlitesync.js:278
SQLStatement (async)
(anonymous) @ sqlitesync.js:261
SQLTransaction (async)
sqlitesync_SyncSendTable @ sqlitesync.js:260
(anonymous) @ sqlitesync.js:335
SQLStatement (async)
(anonymous) @ sqlitesync.js:261
SQLTransaction (async)
sqlitesync_SyncSendTable @ sqlitesync.js:260
sqlitesync_SyncSendData @ sqlitesync.js:255
(anonymous) @ sqlitesync.js:47
SQLTransaction (async)
sqlitesync_SyncSendAndReceive @ sqlitesync.js:22
doSync @ index.htm:75
onclick @ index.htm:28
index.htm:1 Access to XMLHttpRequest at 'http://macmini:8080/SqliteSync-3.2.14/API3/Send' from origin 'http://luzi2' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: No 'Access-Control-Allow-Origin' header is present on the requested resource.
Please I will appreciate any help on how i can use this service in flutter.
ERROR PushInsertRecords() constraint violation PRIMARY KEY 'PK_XXX'. cannot insert the duplicated key in the object 'dbo.XXX'.
This make no sense because is not a new record. Its the same record the App sent to DB.
In the next syncronization get this message
Hi. Thank you for this interesting proyect. Right now I'm interested in making "filtering" work. Is there something wrong with the code version of SyncService.java? In particular in the implementation of method "EnumarateChanges"? I see from the code that the parameter "tableFilter" is never used inside the method. How can I used the VIEW I created in MySQL to filter the data generated?
Thanks...
Luis Fernando
With an out-of-the box install of Java and Tomcat, the logs typically end up reporting: (Using SqliteSync-3.2.16)
javax.servlet.ServletException: org.glassfish.jersey.server.ContainerException: java.lang.OutOfMemoryError: GC overhead limit exceeded
I'm receiving this error when access: localhost:8080/sync/API3.
My web.xml:
working-dir
java.lang.String
C:\Users\Luiza\sync</env-entry-value>
My sync.properties file(located at 'C:\Users\Luiza\sync\config\sync.properties') :
DB_ENGINE = postgres
DBURL = jdbc:postgresql://localhost:56582/sync
DBUSER = postgres
DBPASS = postgres
DBDRIVER = org.postgresql.Driver
DATE_FORMAT = yyyy-MM-dd HH:mm:ss
HISTORY_DAYS = 7
LOG_LEVEL = 4
Hello,
I meet this concern again, when the names of the tables are well informed. After several tests I realized that it happened on the tables of joins with only two fields which form a primary key.
I note that the creation of update trigger on a table is performed only on non-key fields. There are none on these tables, which must be the source of the error.
Log line triggering the error:
"00139 PE_ENTRETIEN_ETAT_MergeUpdate": "CREATE TRIGGER IF NOT EXISTS " trMergeUpdate_PE_ENTRETIEN_ETAT \ "AFTER UPDATE OF ON " PE_ENTRETIEN_ETAT \ "BEGIN \ tUPDATE " PE_ENTRETIEN_ETAT = "old Row"; END; ",
The table creation script :
"CREATE TABLE [dbo].[PE_ENTRETIEN_ETAT](
[CLE_ENTRETIEN] varchar NOT NULL,
[CLE_ETAT] varchar NOT NULL,
[RowId] [uniqueidentifier] NULL DEFAULT (newid()),
[RowVer] [int] NOT NULL DEFAULT ((1))
) ON [PRIMARY]"
I am using version 3.2.15 with Microsoft SQL Server.
Do you have a solution?
Hi,
does anyone know where to find the sql scripts for SQWL Server to setup the host database? In resources folder only mysql scripts are available.
Regards,
Ingo
I have successfully sync the data and get all the data in the local SQLite database but when I add a new record in local and try to sync on the server at that time, the new data is not reflating in the server database. Its creating one .dat file and the data is present in it in XML format.
I am using ionic 4 to send the data on the server database.
So can you please help to solve this issue?
when I ReinitializeDatabase , the framework start to create table .
but some times, it doesn't add [RowID] column to the client.
as I know, if a table whithout RowID then can't sync.
I've created 2 tables on the server, test and test2.
when I click ReinitializeDatabase button
test2 has no [Rowid] column,but test has!
I add the exist table to sync（call AddTable API) always get this error.
here is the ReinitializeDatabase response content:
we can see about the create table test2 code, it really has no [RowID]!
there is a 'rowid' in the test table:
"00014 test" : "CREATE TABLE "test" ([id] INTEGER ,[name] TEXT DEFAULT ('NULL') ,[age] INTEGER DEFAULT (NULL) ,[birthday] DATETIME ,[RowId] TEXT DEFAULT ('NULL') ,"MergeUpdate" INTEGER NOT NULL DEFAULT (0) );",
but,there is not a 'rowid' in the test2 table.
"00007 test2" : "CREATE TABLE "test2" ([id] INTEGER ,[country] TEXT DEFAULT ('NULL') ,[city] TEXT DEFAULT ('NULL') ,[code] INTEGER DEFAULT (NULL) ,"MergeUpdate" INTEGER NOT NULL DEFAULT (0) );",
I've installed the sqlite-sync on my local computer ,which runs windows with apache,mysql and tomcat.
when I access http://127.0.0.1:8080/SqliteSync/API3 from chrome,it works correctly as display:
API[3.2.7] SQLite-Sync.COM is working correctly! Database connected!
I changed the C# demo code, set wsUrl = "http://127.0.0.1:8080/SqliteSync/API3";
when I click 'Reintialize database' or 'Send and Recieve' button, I always get an error.
the response is ：Error creating new subscriber for UUID 1
I open logo file,
There is an error: Table 'testdb.mergesubscribers' doesn't exist. testdb is my database name.
Question is:
how to create mergesubscribers??
Isn't it automatic?
Hi, i want to synchronize in two nodes a table with a amount of 400000 rows. When i try it, the system never come back the JSON because the size of the data to send. There is not problem when y synchronize less info.
So, i want to know if there is a way to limit the amount of data of the JSON. The only table i want to sync have the next columns:
I use MySQL like a primary node and SQLiteSync 3.2.3
Thanks
The Demo seems to be only a fragment. Three tables should be sync, but they are never added to sync. As a consequence the program runs in ArgumentNullException
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