Package io.ebean.config.dbplatform.postgres

Class PostgresHistorySupport

java.lang.Object

io.ebean.config.dbplatform.DbViewHistorySupport

io.ebean.config.dbplatform.postgres.PostgresHistorySupport

All Implemented Interfaces:

DbHistorySupport

public class PostgresHistorySupport
extends DbViewHistorySupport

Postgres support for history features.

Constructor Summary

Constructors

Constructor	Description
PostgresHistorySupport()

Method Summary

Modifier and Type	Method	Description
String	getAsOfPredicate(String asOfTableAlias, String asOfSysPeriod)	Build and return the 'as of' predicate for a given table alias.
int	getBindCount()	Return 1 as we are using the postgres range type and hence don't need 2 bind variables.
String	getSysPeriodLower(String tableAlias, String sysPeriod)	Return the lower bound column prepended with the table alias.
String	getSysPeriodUpper(String tableAlias, String sysPeriod)	Return the upper bound column prepended with the table alias.

Methods inherited from class io.ebean.config.dbplatform.DbViewHistorySupport

getAsOfViewSuffix, getVersionsBetweenSuffix, isStandardsBased

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

PostgresHistorySupport

public PostgresHistorySupport()

Method Details

getBindCount

public int getBindCount()

Return 1 as we are using the postgres range type and hence don't need 2 bind variables.

Specified by:

getBindCount in interface DbHistorySupport

Overrides:

getBindCount in class DbViewHistorySupport

getAsOfPredicate

public String getAsOfPredicate(String asOfTableAlias,
String asOfSysPeriod)

Build and return the 'as of' predicate for a given table alias.

Each @History entity involved in the query has this predicate added using the related table alias.

Specified by:

getAsOfPredicate in interface DbHistorySupport

Overrides:

getAsOfPredicate in class DbViewHistorySupport

Parameters:

asOfTableAlias - The table alias this predicate is added for

asOfSysPeriod - The name of the 'sys_period' column used for effective date time range.

Returns:

The predicate containing a single ? bind parameter which will be bound to the 'as at' timestamp value

getSysPeriodLower

public String getSysPeriodLower(String tableAlias,
String sysPeriod)

Description copied from class: DbViewHistorySupport

Return the lower bound column prepended with the table alias.

Specified by:

getSysPeriodLower in interface DbHistorySupport

Overrides:

getSysPeriodLower in class DbViewHistorySupport

Parameters:

tableAlias - the table alias

sysPeriod - the name of the sys_period column

getSysPeriodUpper

public String getSysPeriodUpper(String tableAlias,
String sysPeriod)

Description copied from class: DbViewHistorySupport

Return the upper bound column prepended with the table alias.

Specified by:

getSysPeriodUpper in interface DbHistorySupport

Overrides:

getSysPeriodUpper in class DbViewHistorySupport

Parameters:

tableAlias - the table alias

sysPeriod - the name of the sys_period column