Upsert Strategy Codes

Variables
const	SqlUtil::AbstractTable::UpsertAuto = 4
	Upsert option: if the target table is empty, use UpsertInsertFirst, otherwise use UpsertUpdateFirst.
const	SqlUtil::AbstractTable::UpsertInsertFirst = 1
const	SqlUtil::AbstractTable::UpsertInsertOnly = 5
	Upsert option: insert if the row does not exist, otherwise ignore.
const	SqlUtil::AbstractTable::UpsertSelectFirst = 3
	Upsert option: select first, if the row is unchanged, do nothing, if it doesn't exist, insert, otherwise update.
const	SqlUtil::AbstractTable::UpsertStrategyDescriptionMap = ...
	hash mapping upsert strategy descriptions to upsert strategy codes
const	SqlUtil::AbstractTable::UpsertStrategyMap = ...
	hash mapping upsert strategy codes to a text description
const	SqlUtil::AbstractTable::UpsertUpdateFirst = 2
	Upsert option: update first, if the update fails, then insert.
const	SqlUtil::AbstractTable::UpsertUpdateOnly = 6
	Upsert option: update if the row exists, otherwise ignore.

Detailed Description

These options are used with:

• SqlUtil::AbstractTable::getBulkUpsertClosure()
• SqlUtil::AbstractTable::getUpsertClosure()
• SqlUtil::AbstractTable::getUpsertClosureWithValidation()
• SqlUtil::AbstractTable::upsert()
• SqlUtil::AbstractTable::upsertCommit()
• SqlUtil::AbstractTable::upsertFromIterator()
• SqlUtil::AbstractTable::upsertFromIteratorCommit()
• SqlUtil::AbstractTable::upsertFromSelect()
• SqlUtil::AbstractTable::upsertFromSelectCommit()

to specify the upsert strategy when synchronizing table data

Variable Documentation

UpsertAuto

const SqlUtil::AbstractTable::UpsertAuto = 4

Upsert option: if the target table is empty, use UpsertInsertFirst, otherwise use UpsertUpdateFirst.

With this upsert strategy, the following row result codes are possible:

• UR_Inserted
• UR_Verified (the only value returned by certain drivers with optimized upsert implementations)

UpsertInsertFirst

const SqlUtil::AbstractTable::UpsertInsertFirst = 1

Upsert option: insert first, if the insert fails, then update with this option an insert is attempted, and if it fails due to a duplicate row, then an update is made unconditionally; with this upsert strategy, the following row result codes are possible:

• UR_Inserted
• UR_Verified (the only value returned by certain drivers with optimized upsert implementations)

UpsertInsertOnly

const SqlUtil::AbstractTable::UpsertInsertOnly = 5

Upsert option: insert if the row does not exist, otherwise ignore.

With this upsert strategy, the following row result codes are possible:

• UR_Inserted
• UR_Unchanged

UpsertSelectFirst

const SqlUtil::AbstractTable::UpsertSelectFirst = 3

Upsert option: select first, if the row is unchanged, do nothing, if it doesn't exist, insert, otherwise update.

with this option the row is selected, if it doesn't exist, an insert is made, and an update is made only if the values are different; with this upsert strategy, the following row result codes are possible:

• UR_Inserted
• UR_Updated
• UR_Unchanged

UpsertStrategyDescriptionMap

const SqlUtil::AbstractTable::UpsertStrategyDescriptionMap = ...

hash mapping upsert strategy descriptions to upsert strategy codes

See also

UpsertStrategyMap for a reverse mapping

UpsertStrategyMap

const SqlUtil::AbstractTable::UpsertStrategyMap = ...

hash mapping upsert strategy codes to a text description

See also

UpsertStrategyDescriptionMap for a reverse mapping

UpsertUpdateFirst

const SqlUtil::AbstractTable::UpsertUpdateFirst = 2

Upsert option: update first, if the update fails, then insert.

with this option an update is attempted, and if it fails due to a missing row, then an insert is performed; with this upsert strategy, the following row result codes are possible:

• UR_Inserted
• UR_Verified (the only value returned by certain drivers with optimized upsert implementations)

UpsertUpdateOnly

const SqlUtil::AbstractTable::UpsertUpdateOnly = 6

Upsert option: update if the row exists, otherwise ignore.

With this upsert strategy, the following row result codes are possible:

• UR_Verified
• UR_Unchanged