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feature(finisher_api): add Exists method #7216

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feature(finisher_api): add Exists method #7216

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6 changes: 6 additions & 0 deletions finisher_api.go
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Original file line number Diff line number Diff line change
Expand Up @@ -502,6 +502,12 @@ func (db *DB) Count(count *int64) (tx *DB) {
return
}

// Exists checks if there is any record matching the given conditions
func (db *DB) Exists() (bool, error) {
var exists bool
return exists, db.Session(&Session{NewDB: true}).Raw("SELECT ?", Expr("EXISTS(?)", db.Select("1"))).Pluck("exists", &exists).Error
}

func (db *DB) Row() *sql.Row {
tx := db.getInstance().Set("rows", false)
tx = tx.callbacks.Row().Execute(tx)
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22 changes: 22 additions & 0 deletions tests/query_test.go
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Expand Up @@ -1453,3 +1453,25 @@ func TestQueryScanToArray(t *testing.T) {
t.Error("users[1] should be empty")
}
}

func TestExists(t *testing.T) {
if DB.Dialector.Name() == "sqlserver" {
t.Skip()
}

ok, err := DB.Table("users").Where("name = ?", "jinzhu").Exists()
if err != nil {
t.Fatalf("Failed to scan, got %v", err)
}
if !ok {
t.Errorf("Should found record")
}

ok, err = DB.Table("users").Where("name = ?", "jinzhu-jinzhu").Exists()
if err != nil {
t.Fatalf("Failed to scan, got %v", err)
}
if ok {
t.Errorf("Should not found record")
}
}
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