Replication management functions

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Replication management functions

Overview

Functions for managing the assisted replication

Functions for managing the universal replication

Functions for managing log-based replication

Functions used to handle the replication of HFSQL servers

Related examples

See also

Replication management functions

Overview

Different types of replication are proposed:

the assisted replication. This replication mode is used to easily define the records to replicate via ReplicEdit. Then, the records are replicated by ReplicSynchro. This replication mode uses the universal replication. Specific WLanguage functions are used to handle the replications.
The assisted universal replication is available for the iOS and Android applications. For more details, see Replication of mobile data (Android or iOS).
the universal replication. The purpose of universal replication is to keep several databases synchronized. These databases can have different types (HFSQL, Oracle, ...). Universal replication uses a centralized model: all databases are synchronized with a master database. Then, the master database reflect the changes in the other databases. Several WLanguage functions are used to implement the universal replication.
log-based replication. Log-based replication uses logs to keep the remote HFSQL databases up to date. Several WLanguage functions are used to implement log-based replication. You can also use WDReplic.
the replication between HFSQL servers. This replication mode is used to update the data found on HFSQL servers linked 2 by 2.

Functions for managing the assisted replication

The following functions are used to implement the assisted universal replication (replication created from ReplicEdit):


ReplicDeleteSubscription	Deletes the subscription of a replication on the replication server.
ReplicInfo	Returns information about a replication.
ReplicInitialize	Initializes or reinitializes a replication defined by the replication editor (ReplicEdit).
ReplicOpen	Opens a replication in direct mode or with a replication server.
ReplicSynchronize	Synchronizes the data corresponding to a replication.

Functions for managing the universal replication

The following functions are used to implement a universal replication. For more details, see Implementing universal replication.


HCreateMasterReplica	Creates the description file of a Master Replica (logged replication or universal replication).
HCreateMovableReplica	Creates a movable replication.
HCreateSubscriberReplica	Creates the description file of a subscriber replica.
HRecreateSubscriberReplica	Re-creates the description file of a subscriber replica (universal replication only) according to the information of the master replica (.RPM and.SYN files).
HRplDeclareLink	Declares a (1, 1) (0, n) link between two tables.
HRplFilterProcedure	Defines the WLanguage procedure that will be called whenever a replication operation is performed on a specific file.
HRplManageFile	Defines the options used for the universal replication of a file: the replication direction. the management mode of conflicts.
HRplManageItem	Specifies the replication options for an item: the item can be replicated or not.
HRplPass	Sets the passwords used to protect the universal replication files.
HSetReplication	Temporarily disables (or re-enables) the replication.
HSynchronizeReplica	Synchronizes the master replica and the subscriber replica: the operations performed on one of the replicas are transferred into the other replica.

Functions for managing log-based replication

The following functions are used to implement log-based replication. For more details, see Programming a log-based replication.


HChangeRplDir	Modifies the location for the description of subscriber replica (RPL file).
HCreateMasterReplica	Creates the description file of a Master Replica (logged replication or universal replication).
HCreateMovableReplica	Creates a movable replication.
HCreateSubscriberReplica	Creates the description file of a subscriber replica.
HInfoReplica	Returns information about the specified replica.
HInitSubscriber	Initializes the range of automatic identifiers for the description file of subscriber replica (".RPL" extension).
HSetReplication	Temporarily disables (or re-enables) the replication.
HSynchronizeReplica	Synchronizes the master replica and the subscriber replica: the operations performed on one of the replicas are transferred into the other replica.

Functions used to handle the replication of HFSQL servers

The functions below are used to implement a replication between 2 HFSQL servers. For more details, see Programming a replication of HFSQL servers.


HRSAddConfig	Adds a replication between two HFSQL server onto the master server.
HRSDeleteConfig	Deletes a replication between two HFSQL servers.
HRSExecute	Immediately runs a recurring replication between HFSQL servers: the replication is triggered before the scheduling.
HRSInfo	Reads the replication configuration for an HFSQL server that takes part in one or more replications.
HRSInit	Configures an HFSQL server in order for this server to be a master server or a subscriber server for a replication between HFSQL servers.
HRSListConfig	Lists the replications available on a master HFSQL server.
HRSModifyConfig	Modifies some parameters of an existing replication between two HFSQL servers.
HRSWaitForDataProcess	Waits for: the replication data on the master server to be sent to the subscriber server. the replication data received on the subscriber server to be entirely applied.

The replication between HFSQL servers is also using the following type of data:


hRSConfig	The hRSConfig type is used to define the advanced characteristics of a replication between 2 HFSQL servers.

Related Examples:

Training (WINDEV): WD Universal Replication

[ + ] This examples explains how to use the universal replication to synchronize data of different sites.
The universal replication is used to synchronize the data of a site (master site) with the same data of one or more replicated sites (subscriber sites). The data structures are identical on each site but they can be exploited via different data managers. HFSQL Classic and Access will be used in this example.
The example presents the processes that must be included in your applications to allow the user, via a simple action (menu, button, ...), to:
- create a master replica,
- create one or more subscriber replicas,
- see and modify the data of these replicas,
- export the created or modified data to a site (portable replica),
- import the created or modified data into another site...