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<td id="text-paragraph-pattern-top" class="email-content-main mobile-expand comment-top-special-margin comment-top-pattern" style="padding: 0px; border-collapse: collapse; border-left: 1px solid #ccc; border-right: 1px solid #ccc; border-top: 0; border-bottom: 0; padding: 0 15px 15px 16px; background-color: #fff; border-bottom: 1px solid #ccc; border-bottom: none; padding-bottom: 0px">
<table class="text-paragraph-pattern" cellspacing="0" cellpadding="0" border="0" width="100%" style="border-collapse: collapse; mso-table-lspace: 0pt; mso-table-rspace: 0pt; font-family: Arial, sans-serif; font-size: 14px; line-height: 20px; mso-line-height-rule: exactly; mso-text-raise: 2px">
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<td class="text-paragraph-pattern-container mobile-resize-text" style="padding: 0px; border-collapse: collapse; padding: 0px; padding-left: 16px; padding-bottom: 10px; border-left: 1px solid #ccc; padding-top: 10px"> <span class="diffcontext">IMO, a generic sync process should be:<br /><br />* First stage : *upload*<br /># client fetch local changes occured since last sync<br /># client send the changes to server<br /># server apply the changes and generate conflict report<br /># client mark the upload success or process the conflict report<br /># if no conflict, goto second stage<br /><br />* Second stage : *download*<br /># client fetch remote changes occured since last sync<br /># server send the changes to client<br /># client apply the changes and generate conflict report<br /># client mark the download success or process the conflict report<br /><br />----<br /><br />For each committed transaction, if any changes occured, Envers<br />will generate a revision record in database. <br /><br />When upload, if no conflicts or errors, a client id should be <br />persisted on server with a new server revision number. So the<br />persisted revision info should including:<br />{code}<br /> revisionNumber<br /> clientId<br />{code}<br /><br />When download, if no conflicts or errors, the server revision <br />number should be persisted on client with a new client revision<br />number. So the persisted revision info should including:<br />{code}<br /> revisionNumber<br /> serverRevisionNumber<br />{code}<br /><br />To select the changes from client : <br />{code:title=Select last sync rev}<br />SELECT MAX(ri.revisionNumber) FROM revinfo ri<br /> WHERE ri.serverRevisionNumber IS NOT NULL<br />{code}<br /><br />{code:title=Select incremental Inserts}<br />SELECT e FROM Entity e <br /> WHERE e.id IN (<br /> SELECT er.originalId.id FROM AuditEntity er<br /> WHERE er.REVTYPE = ADD<br /> AND er.originalId.REV.id > :lastSyncRev<br /> )<br />{code}<br /><br />{code:title=Select incremental Updates}<br />SELECT e FROM Entity e <br /> WHERE e.id IN (<br /> SELECT er.originalId.id FROM AuditEntity er<br /> WHERE er.REVTYPE = MOD<br /> AND er.originalId.REV.id > :lastSyncRev<br /> ) AND e.id NOT IN(<br /> SELECT er.originalId.id FROM AuditEntity er<br /> WHERE er.REVTYPE = ADD<br /> AND er.originalId.REV.id > :lastSyncRev<br /> )<br />{code}<br /><br />{code:title=Select incremental Deletes}<br />SELECT er FROM AuditEntity er<br /> WHERE er.REVEND = (<br /> SELECT ier.originalId.REV.id FROM AuditEntity ier<br /> WHERE ier.REVTYPE = DEL<br /> AND ier.originalId.REV.id > :lastSyncRev<br /> )<br />{code}<br /><br />To select the changes from server : <br />{code:title=Select last sync rev}<br />SELECT MAX(ri.revisionNumber) FROM revinfo ri<br /> WHERE ri.clientId = :clientId<br />{code}<br /><br />{code:title=Select max sync rev}<br />SELECT MAX(ri.revisionNumber) FROM revinfo ri<br /> WHERE ri.clientId != :clientId OR <br /> ri.clientId IS NULL<br />{code}<br /><br />{code:title=Select incremental Inserts}<br />SELECT e FROM Entity e <br /> WHERE e.id IN (<br /> SELECT er.originalId.id FROM AuditEntity er<br /> WHERE er.REVTYPE = ADD<br /> AND er.originalId.REV.id > :lastSyncRev<br /> AND er.originalId.REV.id <= maxSyncRev<br /> AND (<br /> er.originalId.REV.clientId != :clientId <br /> OR er.originalId.REV.clientId IS NULL<br /> )<br /> )<br />{code}<br /><br />{code:title=Select incremental Updates}<br />SELECT e FROM Entity e <br /> WHERE e.id IN (<br /> SELECT er.originalId.id FROM AuditEntity er<br /> WHERE er.REVTYPE = MOD<br /> AND er.originalId.REV.id > :lastSyncRev<br /> AND er.originalId.REV.id <= :maxSyncRev<br /> AND (<br /> er.originalId.REV.clientId != :clientId <br /> OR er.originalId.REV.clientId IS NULL<br /> )<br /> ) AND e.id NOT IN(<br /> SELECT er.originalId.id FROM AuditEntity er<br /> WHERE er.REVTYPE = ADD<br /> AND er.originalId.REV.id > :lastSyncRev<br /> AND er.originalId.REV.id <= :maxSyncRev<br /> AND (<br /> er.originalId.REV.clientId != :clientId <br /> OR er.originalId.REV.clientId IS NULL<br /> )<br /> )<br />{code}<br /><br />{code:title=Select incremental Deletes}<br />SELECT er FROM AuditEntity er<br /> WHERE er.REVEND = (<br /> SELECT ier.originalId.REV.id FROM AuditEntity ier<br /> WHERE ier.REVTYPE = DEL<br /> AND ier.originalId.REV.id > :lastSyncRev<br /> AND ier.originalId.REV.id <= :maxSyncRev<br /> AND (<br /> ier.originalId.REV.clientId != :clientId <br /> OR ier.originalId.REV.clientId IS NULL<br /> )<br /> )<br />{code}<br /><br />----<br />REFERENCES:<br /># [Microsoft Sync Framework</span> <span class="diffremovedchars" style="background-color:#ffe7e7;text-decoration:line-through;">:</span> <span class="diffaddedchars" style="background-color:#ddfade;">|</span> <span class="diffcontext">http://msdn.microsoft.com/en-us/library/bb902854.aspx]</span>
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<td id="page-title-pattern-first-line" style="padding: 0px; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 16px"> <a href="https://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-8506" style="color: #3b73af; text-decoration: none"><img src="https://hibernate.atlassian.net/images/icons/issuetypes/newfeature.png" height="16" width="16" border="0" align="absmiddle" alt="New Feature" /></a> <a href="https://hibernate.atlassian.net/browse/HHH-8506" style="color: #3b73af; text-decoration: none">HHH-8506</a>
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