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Merge pull request #4022 from jianzhiyao/develop

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stmt: fix bug of non concurrent security & add double check
This commit is contained in:
Ming Deng 2020-06-21 18:01:14 +08:00 committed by GitHub
commit e1386c448c
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1 changed files with 12 additions and 5 deletions
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17
orm/db_alias.go
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@ -120,17 +120,24 @@ func (d *DB) BeginTx(ctx context.Context, opts *sql.TxOptions) (*sql.Tx, error)
func (d *DB) getStmt(query string) (*sql.Stmt, error) {
d.RLock()
if stmt, ok := d.stmts[query]; ok {
d.RUnlock()
return stmt, nil
}
c, ok := d.stmts[query]
d.RUnlock()
if ok {
return c, nil
}
d.Lock()
c, ok = d.stmts[query]
if ok {
d.Unlock()
return c, nil
}
stmt, err := d.Prepare(query)
if err != nil {
d.Unlock()
return nil, err
}
d.Lock()
d.stmts[query] = stmt
d.Unlock()
return stmt, nil