base class for bulk DML upsert operations More...

Inheritance diagram for BulkSqlUtil::BulkUpsertOperation:

Public Member Methods
	constructor (SqlUtil::Table target, *hash opts)
	creates the object from the supplied arguments More...

	constructor (SqlUtil::AbstractTable target, *hash opts)
	creates the object from the supplied arguments More...

Public Member Methods inherited from BulkSqlUtil::AbstractBulkOperation
nothing	commit ()
	flushes any queued data and commits the transaction

	constructor (string name, SqlUtil::Table target, *hash opts)
	creates the object from the supplied arguments More...

	constructor (string name, SqlUtil::AbstractTable target, *hash opts)
	creates the object from the supplied arguments More...

	destructor ()
	throws an exception if there is data pending in the internal row data cache; make sure to call flush() or discard() before destroying the object More...

	discard ()
	discards any buffered batched data; this method should be called before destroying the object if an error occurs More...

	flush ()
	flushes any remaining batched data to the database; this method should always be called before committing the transaction or destroying the object More...

Qore::SQL::AbstractDatasource	getDatasource ()
	returns the AbstractDatasource object associated with this object

int	getRowCount ()
	returns the affected row count

SqlUtil::AbstractTable	getTable ()
	returns the underlying SqlUtil::AbstractTable object

string	getTableName ()
	returns the table name

	queueData (hash data)
	queues row data in the block buffer; the block buffer is flushed to the DB if the buffer size reaches the limit defined by the `block_size` option; does not commit the transaction More...

	queueData (list l)
	queues row data in the block buffer; the block buffer is flushed to the DB if the buffer size reaches the limit defined by the `block_size` option; does not commit the transaction More...

nothing	rollback ()
	discards any queued data and rolls back the transaction

int	size ()
	returns the current size of the cache as a number of rows More...

Private Member Methods
	flushImpl ()
	executes bulk DML upserts in the database with internally queued data

	init (*hash opts)
	common constructor initialization

Private Member Methods inherited from BulkSqlUtil::AbstractBulkOperation
	flushIntern ()
	flushes queued data to the database

	init (*hash opts)
	common constructor initialization

	setupInitialRow (hash row)
	sets up the block buffer given the initial template row for inserting

	setupInitialRowColumns (hash row)
	sets up the block buffer given the initial template hash of lists for inserting

Additional Inherited Members
Public Attributes inherited from BulkSqlUtil::AbstractBulkOperation
const	OptionDefaults
	default option values

const	OptionKeys
	option keys for this object

Private Attributes inherited from BulkSqlUtil::AbstractBulkOperation
softint	block_size
	bulk operation block size

hash	cval
	"constant" row values; must be equal in all calls to queueData

list	cval_keys
	"constant" row value keys

hash	hbuf
	buffer for bulk operations

*code	info_log
	an optional info logging callback; must accept a sprintf()-style format specifier and optional arguments

string	opname
	operation name

list	ret_args = ()
	list of "returning" columns

int	row_count = 0
	row count

SqlUtil::AbstractTable	table
	the target table object

Detailed Description

base class for bulk DML upsert operations

This class assists with bulk upsert (SQL merge) operations into a target table.

Submitting Data: To use this class, queue data in the form of a hash (a single row or a set of rows) or a list of rows by calling the queueData() method.

The queueData() method queues data to be written to the database; the queue is flush()ed automatically when block_size rows have been queued.

Flushing and Discarding Data: Each call to flush() (whether implicit or explicit) will cause a single call to be made to the dataserver; all queued rows are sent in a single bulk DML call, which allows for efficient processing of large amounts of data.

A call to flush() must be made before committing the transaction to ensure that any remaining rows in the internal queue have been written to the database. Because the destructor() will throw an exception if any data is left in the internal queue when the object is destroyed, a call to discard() must be made prior to the destruction of the object in case of errors.

# single commit and rollback
on_success ds.commit();
on_error ds.rollback();
{
    BulkUpsertOperation op1(table1);
    BulkUpsertOperation op2(table2);
    # each operation needs to be flushed or discarded individually
    on_success {
        op1.flush();
        op2.flush();
    }
    on_error {
        op1.discard();
        op2.discard();
    }
    # data is queued and flushed automatically when the buffer is full
    map op1.queueData($1), data1.iterator();
    map op2.queueData($1), data2.iterator();
}

Note: Wach bulk DML object must be manually flush()ed before committing or manually discard()ed before rolling back to ensure that all data is managed properly in the same transaction and to ensure that no exception is thrown in the destructor(). See the example above for more information.

Member Function Documentation

◆ constructor() [1/2]

BulkSqlUtil::BulkUpsertOperation::constructor	(	SqlUtil::Table	target,
		*hash	opts
	)

creates the object from the supplied arguments

Parameters

target the target table object

opts

an optional hash of options for the object as follows:

"block_size": the number of rows executed at once (default: 1000)
"info_log": an optional info logging callback; must accept a string format specifier and sprintf()-style arguments
"upsert_strategy": the upsert strategy to use; default SqlUtil::AbstractTable::UpsertAuto; see Upsert Strategy Codes for possible values for the upsert strategy

◆ constructor() [2/2]

BulkSqlUtil::BulkUpsertOperation::constructor	(	SqlUtil::AbstractTable	target,
		*hash	opts
	)