org.qore.lang.bulksqlutil.BulkUpsertOperation Class Reference

base class for bulk DML upsert operations More...

Inheritance diagram for org.qore.lang.bulksqlutil.BulkUpsertOperation:

Public Member Methods
	BulkUpsertOperation (AbstractTable target, Map< String, Object > opts) throws Throwable
	creates the object from the supplied arguments
	BulkUpsertOperation (AbstractTable target) throws Throwable
	creates the object from the supplied arguments
Public Member Methods inherited from org.qore.lang.bulksqlutil.AbstractBulkOperation
	AbstractBulkOperation (QoreObject obj) throws Throwable
	creates a new AbstractBulkOperation object wrapping the Qore object
void	queueData (Map< String, Object > data) throws Throwable
	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
void	queueData (Map< String, Object >[] l) throws Throwable
	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
void	flush () throws Throwable
	flushes any remaining batched data to the database; this method should always be called before committing the transaction or destroying the object
void	discard () throws Throwable
	discards any buffered batched data; this method should be called before destroying the object if an error occurs
void	commit () throws Throwable
	flushes any queued data and commits the transaction
void	rollback () throws Throwable
	discards any queued data and rolls back the transaction
String	getTableName () throws Throwable
	returns the table name
AbstractTable	getTable () throws Throwable
	returns the underlying SqlUtil::AbstractTable object
AbstractDatasource	getDatasource () throws Throwable
	returns the AbstractDatasource object associated with this object
int	getRowCount () throws Throwable
	returns the affected row count
Public Member Methods inherited from org.qore.jni.QoreObjectWrapper
	QoreObjectWrapper (QoreObject obj)
	creates the wrapper object with the Qore object
void	release ()
	releases the Qore object; do not call any further methods on the object after this call
QoreObject	getQoreObject ()
	returns the Qore object
String	className ()
	returns the class name for the Qore object
boolean	instanceOf (String class_name)
	returns true if the object is an instance of the given class

Additional Inherited Members
Private Attributes inherited from org.qore.jni.QoreObjectWrapper
QoreObject	obj
	the wrapper Qore 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
try {
    BulkUpsertOperation op1 = new BulkUpsertOperation(table1);
    BulkUpsertOperation op2 = new BulkUpsertOperation(table2);
 
    // data is queued and flushed automatically when the buffer is full
    for (Map<String, Object> i : data1) {
        op1.queueData(i);
    }
    for (Map<String, Object> i : data2) {
        op2.queueData(i);
    }
 
    // each operation needs to be flushed or discarded individually
    op1.flush();
    op2.flush();
    ds.commit();
} catch (Throwable e) {
    op1.discard();
    op2.discard();
    ds.rollback();
    throw e;
}

Note

Each 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 Qore destructor. See the example above for more information.

Deprecated

Use dynamic imports instead: import qoremod.BulkSqlUtil.BulkUpsertOperation;

Constructor & Destructor Documentation

BulkUpsertOperation() [1/2]

org.qore.lang.bulksqlutil.BulkUpsertOperation.BulkUpsertOperation ( AbstractTable target, Map< String, Object > opts ) throws Throwable

inline

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 of type LogCallback "upsert_strategy": the upsert strategy to use; default AbstractTable.UpsertAuto; see Upsert Strategy Codes for possible values for the upsert strategy

BulkUpsertOperation() [2/2]

org.qore.lang.bulksqlutil.BulkUpsertOperation.BulkUpsertOperation ( AbstractTable target ) throws Throwable

inline

creates the object from the supplied arguments

Parameters

target

the target table object

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The documentation for this class was generated from the following file:

• src/java/org/qore/lang/bulksqlutil/BulkUpsertOperation.java