pgroll/examples/16_set_not_null.json

{
  "name": "16_set_not_null",
  "operations": [
    {
      "set_not_null": {
        "table": "reviews",
        "column": "review",
        "up": "(SELECT CASE WHEN review IS NULL THEN product || ' is good' ELSE review END)",
        "down": "review"
      }
    }
  ]
}
Implement the set column `NOT NULL` operation (#63) Implement the operation to make an existing column `NOT NULL`. The migration looks like this: ```json { "name": "16_set_not_null", "operations": [ { "set_not_null": { "table": "reviews", "column": "review", "up": "product \|\| ' is good'" } } ] } ``` This migration adds a `NOT NULL` constraint to the `review` column in the `reviews` table. * On `Start`: * Create a new column with a `NOT VALID` `NOT NULL` constraint * Backfill the new column with values from the existing column using the `up` SQL to replace `NULL` values * Create a trigger to populate the new column when values are written to the old column, rewriting `NULLs` with `up` SQL. * Create a trigger to populate the old column when values are written to the new column. * On `Complete` * Validate the `NOT VALID` `NOT NULL` constraint on the new column. * Add `NOT NULL` to the new column. * Remove triggers and the `NOT VALID` `NOT NULL` constraint * Drop the old column * Rename the new column to the old column name. * On `Rollback` * Remove the new column and both triggers. 2023-08-29 16:53:29 +03:00			`{`
			`"name": "16_set_not_null",`
			`"operations": [`
			`{`
			`"set_not_null": {`
			`"table": "reviews",`
			`"column": "review",`
Allow the set `NOT NULL` operation to take `down` SQL (#85) For consistency with other operations, flexibility and the ability to more easily combine operations into one 'alter column' operation, allow the set `NOT NULL` operation to take user-supplied`down` SQL to be run when moving values from the new to the old schema. Previously, the `down` SQL was assumed to be just a straight copy of the value from the new to the old column. 2023-09-11 12:57:51 +03:00			`"up": "(SELECT CASE WHEN review IS NULL THEN product \|\| ' is good' ELSE review END)",`
			`"down": "review"`
Implement the set column `NOT NULL` operation (#63) Implement the operation to make an existing column `NOT NULL`. The migration looks like this: ```json { "name": "16_set_not_null", "operations": [ { "set_not_null": { "table": "reviews", "column": "review", "up": "product \|\| ' is good'" } } ] } ``` This migration adds a `NOT NULL` constraint to the `review` column in the `reviews` table. * On `Start`: * Create a new column with a `NOT VALID` `NOT NULL` constraint * Backfill the new column with values from the existing column using the `up` SQL to replace `NULL` values * Create a trigger to populate the new column when values are written to the old column, rewriting `NULLs` with `up` SQL. * Create a trigger to populate the old column when values are written to the new column. * On `Complete` * Validate the `NOT VALID` `NOT NULL` constraint on the new column. * Add `NOT NULL` to the new column. * Remove triggers and the `NOT VALID` `NOT NULL` constraint * Drop the old column * Rename the new column to the old column name. * On `Rollback` * Remove the new column and both triggers. 2023-08-29 16:53:29 +03:00			`}`
			`}`
			`]`
			`}`