Correcting Escaped Code Example

[shery]

In js, according to the normal string escape rules, need to add \ before \

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[jharrell]

@shery Hey! Thanks for your PR. I think you might be mistaken. We're not trying to escape \ we're just trying to escape _ so \ should not be escaped.

To put it another way, the example shows that the underlying database will understand _benny and \_benny differently as the latter will treat _ as a literal character instead of a wildcard.

[shery]

Hi @jharrell, If executing SQL statements through the mysql Client, then \_ will work as expected (matching the _ character). However, Prisma Client runs in a JavaScript environment, and due to JavaScript's string escape rules (escaping special characters with \), \_ will be interpreted as escaping _ in JavaScript string, so the actual in-memory character is _, causing the finally generated SQL query statement to not contain \. This results in _ not being escaped.

Here is a simple example:

id	name	age	city
1	John Doe	35	new_york
2	Jane Smith	28	newxyork

const arr1 = await prisma.user.findMany({
  where: {
    city: {
      contains: 'new\_york',
    },
  },
})

console.log(arr1)
// [{"id":1,"name":"John Doe","age":35,"city":"new_york"},{"id":2,"name":"Jane Smith","age":28,"city":"newxyork"}]

const arr2 = await prisma.user.findMany({
  where: {
    city: {
      contains: 'new\\_york',
    },
  },
})

console.log(arr2)
// [{"id":1,"name":"John Doe","age":35,"city":"new_york"}]

[jharrell]

@shery Huh. How about that. You are correct! Thank you for correcting and apologies for my mistake.

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