cloudfoundry/stratos

package datastore

import (
    "database/sql"
    "strings"

    "bitbucket.org/liamstask/goose/lib/goose"
)

func init() {
    RegisterMigration(20180413135700, "MetricsSchema", func(txn *sql.Tx, conf *goose.DBConf) error {
        if strings.Contains(conf.Driver.Name, "sqlite3") {
            // SQLite does not support MODIFY on ALTER TABLE - but fortunately it doesn't mind about the column sizes
            return nil
        }

        // Special case Postgres as it has different syntax
        if strings.Contains(conf.Driver.Name, "postgres") {
            alterColumn := "ALTER TABLE cnsis ALTER COLUMN cnsi_type TYPE VARCHAR(16), ALTER COLUMN cnsi_type SET NOT NULL"
            _, err := txn.Exec(alterColumn)
            if err != nil {
                return err
            }
        } else {
            // Fallback to MySQL
            alterColumn := "ALTER TABLE cnsis modify cnsi_type VARCHAR(16) NOT NULL"
            _, err := txn.Exec(alterColumn)
            if err != nil {
                return err
            }
        }

        return nil
    })
}