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f764993640
Implement the **drop column** migration operation.
A migration to drop a column looks like this:
```json
{
"name": "09_drop_column",
"operations": [
{
"drop_column": {
"table": "fruits",
"column": "price",
"down": "0"
}
}
]
}
```
The migration takes the name of the table and column that should be
dropped along with (optionally) some `down` SQL to run to populate the
field in the underlying table when insertions are done via the new
schema version while the migration is in progress.
* On `Start`, the relevant view in the new version schema is created
without the dropped column. The column is not deleted from the
underlying table.
* If `down` SQL is specified, a trigger is created on the underlying
table to populate the column to be removed when inserts are made from
the new schema version.
* On `Rollback` any triggers on the underlying table are removed.
* On `Complete` the old version of the schema is removed and the column
is removed from the underlying table. Any triggers are also removed.
13 lines
171 B
JSON
13 lines
171 B
JSON
{
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"name": "09_drop_column",
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"operations": [
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{
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"drop_column": {
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"table": "fruits",
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"column": "price",
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"down": "0"
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}
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}
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]
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}
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