K
Kysely•9mo ago
PogPEGA

Conditionally updating fields

How would i go about doing something like UPDATE table SET field = IF(condition, trueValue, falseValue) WHERE someCondition;, i can't exactly seem to find that in the docs Driver used: MySQL
Solution:
Hey 👋 Something like: ```ts...
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2 Replies
PogPEGA
PogPEGAOP•9mo ago
actually, this can be done with <ExpressionBuilder>.case(), but is it possible to write smth like id = id - 1 or would i be sticking to raw sql for scenarios like these?
Solution
Igal
Igal•9mo ago
Hey 👋 Something like: 
await db
  .updateTable("person")
  .set("children", (eb) =>
    eb
      .case()
      .when("has_spouse", "=", eb.lit(1))
      .then(eb("children", "+", eb.lit(1)))
      .else(eb.ref("children"))
      .end(),
  )
  .where("first_name", "=", "Bob")
  .execute();
await db
  .updateTable("person")
  .set("children", (eb) =>
    eb
      .case()
      .when("has_spouse", "=", eb.lit(1))
      .then(eb("children", "+", eb.lit(1)))
      .else(eb.ref("children"))
      .end(),
  )
  .where("first_name", "=", "Bob")
  .execute();
https://kyse.link/mqB8C eb.lit is optional here, you could just pass the 1s and have them parametrized. eb(...) allows creating all sorts of binary operations, where by default, the LHS is a column reference, and RHS is a value.

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