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SQL Anywhere 12.0.1 » MobiLink - Client Administration » SQL Anywhere clients for MobiLink » Event hooks for SQL Anywhere clients » Event-hook procedures

 

#hook_dict table

Immediately before a hook is called, dbmlsync creates the #hook_dict table in the remote database, using the following CREATE statement. The # before the table name means that the table is temporary.

CREATE TABLE #hook_dict(
name VARCHAR(128) NOT NULL UNIQUE,
value VARCHAR(10240) NOT NULL)

The dbmlsync utility uses the #hook_dict table to pass values to hook functions, and hook functions use the #hook_dict table to pass values back to dbmlsync.

Each hook receives parameter values. Sometimes, you can modify the value to return a new value; others are read-only. Each row in the table contains the value for one parameter.

For example, suppose two subscriptions are defined as follows:

CREATE SYNCHRONIZATION SUBSCRIPTION sub1
TO pub1
FOR  MyUser;
SCRIPT VERSION 'v1'
CREATE SYNCHRONIZATION SUBSCRIPTION sub2
TO pub2
FOR  MyUser;
SCRIPT VERSION 'v1'

When the sp_hook_dbmlsync_begin hook is called for the following dbmlsync command line

dbmlsync -c 'DSN=MyDsn' -s sub1,sub2

the #hook_dict table contains the following rows:

#hook_dict row Value

subscription_0

sub1

subscription_1

sub2

publication_0

pub1

publication_1

pub2

MobiLink user

MyUser

Script version

v1
Note

The publication_n rows are deprecated and may be removed in a future release.

A hook can retrieve values from the #hook_dict table and use them to customize behavior. For example, to retrieve the MobiLink user you would use a SELECT statement like this:

SELECT value
FROM #hook_dict
WHERE name = 'MobiLink user'

In/out parameters can be updated by your hook to modify the behavior of dbmlsync. For example, in the sp_hook_dbmlsync_abort hook you could instruct dbmlsync to abort synchronization by updating the abort synchronization row of the table using a statement like this:

UPDATE #hook_dict
SET value='true'
WHERE name='abort synchronization'

The description of each hook lists the rows in the #hook_dict table.

 Examples