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Merge pull request #89 from Quentin-M/fv_find_before_lock

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database: Find the FeatureVersion we try to insert before doing any lock
This commit is contained in:
Quentin Machu 2016-03-03 14:33:54 -05:00
commit 1202a25b46
2 changed files with 20 additions and 0 deletions
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17
database/pgsql/feature.go
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@ -91,6 +91,23 @@ func (pgSQL *pgSQL) insertFeatureVersion(featureVersion database.FeatureVersion)
featureVersion.Feature.ID = featureID
// Try to find the FeatureVersion.
//
// In a populated database, the likelihood of the FeatureVersion already being there is high.
// If we can find it here, we then avoid using a transaction and locking the database.
err = pgSQL.QueryRow(searchFeatureVersion, featureID, &featureVersion.Version).
Scan(&featureVersion.ID)
if err != nil && err != sql.ErrNoRows {
return 0, handleError("searchFeatureVersion", err)
}
if err == nil {
if pgSQL.cache != nil {
pgSQL.cache.Add(cacheIndex, featureVersion.ID)
}
return featureVersion.ID, nil
}
// Begin transaction.
tx, err := pgSQL.Begin()
if err != nil {

3
database/pgsql/queries.go
View File

@ -52,6 +52,9 @@ const (
UNION
SELECT id FROM new_feature`
searchFeatureVersion = `
SELECT id FROM FeatureVersion WHERE feature_id = $1 AND version = $2`
soiFeatureVersion = `
WITH new_featureversion AS (
INSERT INTO FeatureVersion(feature_id, version)