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| | BulkUpsertOperation (AbstractTable target, Map< String, Object > opts) throws Throwable |
| | creates the object from the supplied arguments More...
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| | BulkUpsertOperation (AbstractTable target) throws Throwable |
| | creates the object from the supplied arguments More...
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| AbstractBulkOperation (QoreObject obj) throws Throwable |
| | creates a new AbstractBulkOperation object wrapping the Qore object
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| 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 More...
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| 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 More...
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| 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 More...
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| void | discard () throws Throwable |
| | discards any buffered batched data; this method should be called before destroying the object if an error occurs More...
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void | commit () throws Throwable |
| | flushes any queued data and commits the transaction
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void | rollback () throws Throwable |
| | discards any queued data and rolls back the transaction
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String | getTableName () throws Throwable |
| | returns the table name
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AbstractTable | getTable () throws Throwable |
| | returns the underlying SqlUtil::AbstractTable object
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AbstractDatasource | getDatasource () throws Throwable |
| | returns the AbstractDatasource object associated with this object
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int | getRowCount () throws Throwable |
| | returns the affected row count
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| QoreObjectWrapper (QoreObject obj) |
| | creates the wrapper object with the Qore object
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void | release () |
| | releases the Qore object; do not call any further methods on the object after this call
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QoreObject | getQoreObject () |
| | returns the Qore object
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String | className () |
| | returns the class name for the Qore object
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boolean | instanceOf (String class_name) |
| | returns true if the object is an instance of the given class
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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.
try {
for (Map<String, Object> i : data1) {
op1.queueData(i);
}
for (Map<String, Object> i : data2) {
op2.queueData(i);
}
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.
Public Member Methods inherited from org.qore.lang.bulksqlutil.AbstractBulkOperation