在测试了用于批量插入的 activerecord-import库后,我发现它执行的不是一个巨大INSERT
的而是很多小的INSERTs
Xml.import(
insert_values,
ignore: true,
validate: false,
batch_size: 1000
)
# =>
INSERT INTO `xmls` (`path`,`import_id`,`status`,`last_modified`,`created_at`,`updated_at`) VALUES ('test-folder/0_0.xml',114,10,'2019-08-16 20:02:20','2019-08-16 20:02:20','2019-08-16 20:02:20')
INSERT INTO `xmls` (`path`,`import_id`,`status`,`last_modified`,`created_at`,`updated_at`) VALUES ('test-folder/0_1.xml',114,10,'2019-08-16 20:02:20','2019-08-16 20:02:20','2019-08-16 20:02:20')
#...
INSERT INTO `xmls` (`path`,`import_id`,`status`,`last_modified`,`created_at`,`updated_at`) VALUES ('test-folder/0_2.xml',114,10,'2019-08-16 20:02:20','2019-08-16 20:02:20','2019-08-16 20:02:20')
我尝试将 set 设置insert_values
为数组XML.new
和纯数组:
cols = [:path, :import_id, :status, :last_modified]
insert_values = [
[ 0] [
[0] "test-folder/0_0.xml",
[1] 115,
[2] 10,
[3] Sat, 17 Aug 2019 05:37:02 EDT -04:00
],
[ 1] [
[0] "test-folder/0_1.xml",
[1] 115,
[2] 10,
[3] Sat, 17 Aug 2019 05:37:02 EDT -04:00
],
#...
]
Xml.import(
cols,
insert_values,
ignore: true,
validate: false,
batch_size: 1000
)
有谁知道它为什么以这种方式工作?我在文档中找不到任何内容。