| Hi, I am sorry if I am mistaken, but don't you think there is a bit confused behaviour in
Batch Processing section - https://docs.jboss.org/hibernate/orm/4.0/devguide/en-US/html/ch04.html (4.1. Batch inserts) or in previous or current hibernate doc versions.
for (int i = 0; i < 100; i++) {
System.out.println("Save new object " + i);
if (i % 20 == 0) { System.out.println("flush and clear " + i); }
}
Save new object 0
flush and clear 0
Save new object (1-20)
flush and clear 20
Save new object (21-40)
flush and clear 40
Save new object (41-60)
flush and clear 60
Save new object (61-80)
flush and clear 80
Save new object (81-99)
and as you can see that first flush is occurred when first row has been saved,
cause when i=0 (i % 20 == 0) -> true. As for me it should be:
int batchSize = 0;
for (int i = 0; i < 100; i++) {
System.out.println("Save new object " + i);
if (++batchSize % 20 == 0) { System.out.println("flush and clear " + i); } }
Save new object (0-19)
flush and clear 19
Save new object (20-39)
flush and clear 39
Save new object (40-59)
flush and clear 59
Save new object (60-79)
flush and clear 79
Save new object (80-99) Here we see that first flush is occurred exactly after 20 rows have been saved.
This result many people expect and this example is clearer than first one. |