templating api

api/src/db/utils/knex-query-to-sequelize-raw.ts

@@ -0,0 +1,54 @@
+import { Knex } from "knex"
+import { QueryTypes, QueryOptionsWithType } from "@sequelize/core"
+
+import db from "@/db/db-client"
+
+type QueryOptions = Omit<QueryOptionsWithType<QueryTypes.SELECT>, "bind" | "type">
+
+// TODO: fix types to show that it might return null
+export async function knexQueryToSequelizeSelect<T extends object>(
+  knexQuery: Knex.QueryBuilder,
+  options: QueryOptions = {}
+) {
+  const { sql: knexSql, bindings } = knexQuery.toSQL().toNative()
+  const { sql: sequelizeSql, bind } = knexSqlNativeToSequelizeQueryWithBind({
+    sql: knexSql,
+    bindings,
+  })
+  return db.query<T>(sequelizeSql, {
+    ...options,
+    bind,
+    type: QueryTypes.SELECT,
+  })
+}
+
+/**
+ * Note siganture is chosen so you can pass knexQuery.toSQL().toNative() directly
+ *
+ * Currently only tested with MSSQL dialect
+ *
+ * @param sqlWithKnexBindings knexQuery.toSQL().toNative().sql
+ * @param bindings knexQuery.toSQL().toNative().bindings
+ * @returns { sql: string, bind: unknown[] } in Sequelize format
+ */
+export function knexSqlNativeToSequelizeQueryWithBind({
+  sql: sqlWithKnexBindings,
+  bindings,
+}: {
+  sql: string
+  bindings: readonly unknown[]
+}): { sql: string; bind: unknown[] } {
+  let sqlWithSequelizeBindings = sqlWithKnexBindings
+  // converts "@p0" to "$1", "@p1" to "$2", etc.
+  bindings.forEach((_, i) => {
+    const pattern = new RegExp(`@p${i}\\b`, "g")
+    sqlWithSequelizeBindings = sqlWithSequelizeBindings.replace(pattern, `$${i + 1}`)
+  })
+
+  const mutableBindings = [...bindings]
+
+  return {
+    sql: sqlWithSequelizeBindings,
+    bind: mutableBindings,
+  }
+}