io.ebeaninternal.dbmigration.ddlgeneration.platform.H2HistoryDdl Maven / Gradle / Ivy
package io.ebeaninternal.dbmigration.ddlgeneration.platform;
import io.ebean.config.dbplatform.h2.H2HistoryTrigger;
import io.ebeaninternal.dbmigration.ddlgeneration.DdlBuffer;
import io.ebeaninternal.dbmigration.ddlgeneration.DdlWrite;
import io.ebeaninternal.dbmigration.model.MTable;
import java.io.IOException;
/**
* H2 history support using DB triggers to maintain a history table.
*/
public class H2HistoryDdl extends DbTriggerBasedHistoryDdl {
private static final String TRIGGER_CLASS = H2HistoryTrigger.class.getName();
public H2HistoryDdl() {
}
@Override
protected void dropTriggers(DdlBuffer buffer, String baseTable) throws IOException {
buffer.append("drop trigger ").append(updateTriggerName(baseTable)).endOfStatement();
}
@Override
protected void createTriggers(DdlWrite writer, MTable table) throws IOException {
String baseTableName = table.getName();
DdlBuffer apply = writer.applyHistory();
addCreateTrigger(apply, updateTriggerName(baseTableName), baseTableName);
}
@Override
protected void updateHistoryTriggers(DbTriggerUpdate update) throws IOException {
DdlBuffer buffer = update.historyBuffer();
dropTriggers(buffer, update.getBaseTable());
addCreateTrigger(buffer, updateTriggerName(update.getBaseTable()), update.getBaseTable());
}
private void addCreateTrigger(DdlBuffer apply, String triggerName, String baseTable) throws IOException {
// Note that this does not take into account the historyTable name (excepts _history suffix) and
// does not take into account excluded columns (all columns included in history)
apply
.append("create trigger ").append(triggerName).append(" before update,delete on ").append(baseTable)
.append(" for each row call \"" + TRIGGER_CLASS + "\";").newLine();
}
}