Add Batch Insert Records With createMany as a Prisma TIL

prisma/batch-insert-records-with-create-many.md

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+# Batch Insert Records With createMany
+
+As part of its suite of CRUD functionality, [Prisma has a `createMany`
+function](https://www.prisma.io/docs/reference/api-reference/prisma-client-reference#createmany)
+that allows you to `insert` many records at once with your target database.
+This will perform one large insert statement which will generally be faster
+than an equivalent series of individual insert statements.
+
+```javascript
+const createResult = await prisma.books.createMany({
+  data: [
+    { isbn: '123', title: 'The Goldfinch' },
+    { isbn: '345', title: 'Piranesi' },
+    { isbn: '987', title: 'The Fifth Season' },
+  ],
+  skipDuplicates: true
+})
+```
+
+With the `skipDuplicates` option, any inserts that would result in a duplicate
+record (`isbn` is my unique key in this example) will be skipped.
+
+The result of the query will include a `count` key to let you know how many
+records were actually inserted.
+
+If I'm bulk inserting a _ton_ of data, I like to chunk it up so that I'm not
+creating queries that are too big. For a recent script, I found that `1000` was
+a good chunking number.
+
+```javascript
+import 'chunk' from 'lodash/chunk'
+
+const chunkedBatchInsert = async (records) => {
+  for(const batch of chunk(records, 1000)) {
+    await prisma.books.createMany({
+      data: batch,
+      skipDuplicates: true
+    })
+  }
+}
+```