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Disable foreign_key_checks in Drop command for MySQL (#224) 

* Disable FOREIGN_KEY_CHECKS in MySQL when dropping all tables.

* Lowercased system variable

* Discard error enabling foreign_key_checks, dropping is already successful at this point

* Explicitly discard error
This commit is contained in:
Ferdy Pruis 2019-05-21 19:56:37 +02:00 committed by Dale Hui
parent 2327ddb52d
commit e85c5f51b9
1 changed files with 12 additions and 1 deletions
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13
database/mysql/mysql.go
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@ -344,9 +344,20 @@ func (m *Mysql) Drop() (err error) {
}
if len(tableNames) > 0 {
// disable checking foreign key constraints until finished
query = `SET foreign_key_checks = 0`
if _, err := m.conn.ExecContext(context.Background(), query); err != nil {
return &database.Error{OrigErr: err, Query: []byte(query)}
}
defer func() {
// enable foreign key checks
_, _ = m.conn.ExecContext(context.Background(), `SET foreign_key_checks = 1`)
}()
// delete one by one ...
for _, t := range tableNames {
query = "DROP TABLE IF EXISTS `" + t + "` CASCADE"
query = "DROP TABLE IF EXISTS `" + t + "`"
if _, err := m.conn.ExecContext(context.Background(), query); err != nil {
return &database.Error{OrigErr: err, Query: []byte(query)}
}