Ensure DDL dialect queries propagate error states to descendent scopes.

Includes relevant unit-test.

Branched from jay/current_database (please merge that branch first!).

common_dialect.go

@@ -74,7 +74,7 @@ func (c commonDialect) HasTable(scope *Scope, tableName string) bool {
 		databaseName string
 	)
 	c.CurrentDatabase(scope, &databaseName)
-	scope.NewDB().Raw("SELECT count(*) FROM INFORMATION_SCHEMA.TABLES WHERE table_name = ? AND table_schema = ?", tableName, databaseName).Row().Scan(&count)
+	c.RawScanInt(scope, &count, "SELECT count(*) FROM INFORMATION_SCHEMA.TABLES WHERE table_name = ? AND table_schema = ?", tableName, databaseName)
 	return count > 0
 }
 
@@ -84,18 +84,30 @@ func (c commonDialect) HasColumn(scope *Scope, tableName string, columnName stri
 		databaseName string
 	)
 	c.CurrentDatabase(scope, &databaseName)
-	scope.NewDB().Raw("SELECT count(*) FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema = ? AND table_name = ? AND column_name = ?", databaseName, tableName, columnName).Row().Scan(&count)
+	c.RawScanInt(scope, &count, "SELECT count(*) FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema = ? AND table_name = ? AND column_name = ?", databaseName, tableName, columnName)
 	return count > 0
 }
 
-func (commonDialect) HasIndex(scope *Scope, tableName string, indexName string) bool {
+func (c commonDialect) HasIndex(scope *Scope, tableName string, indexName string) bool {
 	var count int
-	scope.NewDB().Raw("SELECT count(*) FROM INFORMATION_SCHEMA.STATISTICS where table_name = ? AND index_name = ?", tableName, indexName).Row().Scan(&count)
+	c.RawScanInt(scope, &count, "SELECT count(*) FROM INFORMATION_SCHEMA.STATISTICS where table_name = ? AND index_name = ?", tableName, indexName)
 	return count > 0
 }
 
 func (commonDialect) RemoveIndex(scope *Scope, indexName string) {
-	scope.NewDB().Exec(fmt.Sprintf("DROP INDEX %v ON %v", indexName, scope.QuotedTableName()))
+	scope.Err(scope.NewDB().Exec(fmt.Sprintf("DROP INDEX %v ON %v", indexName, scope.QuotedTableName())).Error)
+}
+
+// RawScanInt scans the first column of the first row into the `scan' int pointer.
+// This function captures raw query errors and propagates them to the original scope.
+func (commonDialect) RawScanInt(scope *Scope, scanPtr *int, query string, args ...interface{}) {
+	scope.Err(scope.NewDB().Raw(query, args...).Row().Scan(scanPtr))
+}
+
+// RawScanString scans the first column of the first row into the `scan' string pointer.
+// This function captures raw query errors and propagates them to the original scope.
+func (commonDialect) RawScanString(scope *Scope, scanPtr *string, query string, args ...interface{}) {
+	scope.Err(scope.NewDB().Raw(query, args...).Row().Scan(scanPtr))
 }
 
 func (commonDialect) CurrentDatabase(scope *Scope, name *string) {

ddl_errors_test.go

@@ -0,0 +1,24 @@
+package gorm_test
+
+import (
+	"testing"
+)
+
+func TestDdlErrors(t *testing.T) {
+	var err error
+
+	if err = DB.Close(); err != nil {
+		t.Errorf("Closing DDL test db connection err=%s", err)
+	}
+	defer func() {
+		// Reopen DB connection.
+		if DB, err = OpenTestConnection(); err != nil {
+			t.Fatalf("Failed re-opening db connection: %s", err)
+		}
+	}()
+
+	DB.HasTable("foobarbaz")
+	if DB.Error == nil {
+		t.Errorf("Expected operation on closed db to produce an error, but err was nil")
+	}
+}

delete_test.go

@@ -10,8 +10,8 @@ func TestDelete(t *testing.T) {
 	DB.Save(&user1)
 	DB.Save(&user2)
 
-	if DB.Delete(&user1).Error != nil {
+	if err := DB.Delete(&user1).Error; err != nil {
-		t.Errorf("No error should happen when delete a record")
+		t.Errorf("No error should happen when delete a record, err=%s", err)
 	}
 
 	if !DB.Where("name = ?", user1.Name).First(&User{}).RecordNotFound() {
@@ -34,8 +34,8 @@ func TestInlineDelete(t *testing.T) {
 		t.Errorf("User can't be found after delete")
 	}
 
-	if DB.Delete(&User{}, "name = ?", user2.Name).Error != nil {
+	if err := DB.Delete(&User{}, "name = ?", user2.Name).Error; err != nil {
-		t.Errorf("No error should happen when delete a record")
+		t.Errorf("No error should happen when delete a record, err=%s", err)
 	} else if !DB.Where("name = ?", user2.Name).First(&User{}).RecordNotFound() {
 		t.Errorf("User can't be found after delete")
 	}
@@ -57,8 +57,8 @@ func TestSoftDelete(t *testing.T) {
 		t.Errorf("Can't find a soft deleted record")
 	}
 
-	if DB.Unscoped().First(&User{}, "name = ?", user.Name).Error != nil {
+	if err := DB.Unscoped().First(&User{}, "name = ?", user.Name).Error; err != nil {
-		t.Errorf("Should be able to find soft deleted record with Unscoped")
+		t.Errorf("Should be able to find soft deleted record with Unscoped, but err=%s", err)
 	}
 
 	DB.Unscoped().Delete(&user)

foundation.go

@@ -51,32 +51,32 @@ func (foundation) SqlTag(value reflect.Value, size int, autoIncrease bool) strin
 	panic(fmt.Sprintf("invalid sql type %s (%s) for foundation", value.Type().Name(), value.Kind().String()))
 }
 
-func (f foundation) ReturningStr(tableName, key string) string {
+func (s foundation) ReturningStr(tableName, key string) string {
-	return fmt.Sprintf("RETURNING %v.%v", f.Quote(tableName), key)
+	return fmt.Sprintf("RETURNING %v.%v", s.Quote(tableName), key)
 }
 
-func (foundation) HasTable(scope *Scope, tableName string) bool {
+func (s foundation) HasTable(scope *Scope, tableName string) bool {
 	var count int
-	scope.NewDB().Raw("SELECT count(*) FROM INFORMATION_SCHEMA.tables WHERE table_schema = current_schema AND table_type = 'TABLE' AND table_name = ?", tableName).Row().Scan(&count)
+	s.RawScanInt(scope, &count, "SELECT count(*) FROM INFORMATION_SCHEMA.tables WHERE table_schema = current_schema AND table_type = 'TABLE' AND table_name = ?", tableName)
 	return count > 0
 }
 
-func (foundation) HasColumn(scope *Scope, tableName string, columnName string) bool {
+func (s foundation) HasColumn(scope *Scope, tableName string, columnName string) bool {
 	var count int
-	scope.NewDB().Raw("SELECT count(*) FROM INFORMATION_SCHEMA.columns WHERE table_schema = current_schema AND table_name = ? AND column_name = ?", tableName, columnName).Row().Scan(&count)
+	s.RawScanInt(scope, &count, "SELECT count(*) FROM INFORMATION_SCHEMA.columns WHERE table_schema = current_schema AND table_name = ? AND column_name = ?", tableName, columnName)
 	return count > 0
 }
 
-func (f foundation) RemoveIndex(scope *Scope, indexName string) {
+func (s foundation) RemoveIndex(scope *Scope, indexName string) {
-	scope.NewDB().Exec(fmt.Sprintf("DROP INDEX %v", f.Quote(indexName)))
+	scope.NewDB().Exec(fmt.Sprintf("DROP INDEX %v", s.Quote(indexName)))
 }
 
-func (foundation) HasIndex(scope *Scope, tableName string, indexName string) bool {
+func (s foundation) HasIndex(scope *Scope, tableName string, indexName string) bool {
 	var count int
-	scope.NewDB().Raw("SELECT count(*) FROM INFORMATION_SCHEMA.indexes WHERE table_schema = current_schema AND table_name = ? AND index_name = ?", tableName, indexName).Row().Scan(&count)
+	s.RawScanInt(scope, &count, "SELECT count(*) FROM INFORMATION_SCHEMA.indexes WHERE table_schema = current_schema AND table_name = ? AND index_name = ?", tableName, indexName)
 	return count > 0
 }
 
-func (foundation) CurrentDatabase(scope *Scope, name *string) {
+func (s foundation) CurrentDatabase(scope *Scope, name *string) {
-	scope.Err(scope.NewDB().Raw("SELECT CURRENT_SCHEMA").Row().Scan(name))
+	s.RawScanString(scope, name, "SELECT CURRENT_SCHEMA")
 }

main.go

@@ -365,7 +365,10 @@ func (s *DB) Rollback() *DB {
 }
 
 func (s *DB) NewRecord(value interface{}) bool {
-	return s.clone().NewScope(value).PrimaryKeyZero()
+	scope := s.clone().NewScope(value)
+	result := scope.PrimaryKeyZero()
+	s.err(scope.db.Error)
+	return result
 }
 
 func (s *DB) RecordNotFound() bool {
@@ -388,7 +391,9 @@ func (s *DB) DropTableIfExists(value interface{}) *DB {
 func (s *DB) HasTable(value interface{}) bool {
 	scope := s.clone().NewScope(value)
 	tableName := scope.TableName()
-	return scope.Dialect().HasTable(scope, tableName)
+	has := scope.Dialect().HasTable(scope, tableName)
+	s.err(scope.db.Error)
+	return has
 }
 
 func (s *DB) AutoMigrate(values ...interface{}) *DB {

main_test.go

@@ -26,25 +26,9 @@ var (
 
 func init() {
 	var err error
-	switch os.Getenv("GORM_DIALECT") {
+
-	case "mysql":
+	if DB, err = OpenTestConnection(); err != nil {
-		// CREATE USER 'gorm'@'localhost' IDENTIFIED BY 'gorm';
+		panic(fmt.Sprintf("No error should happen when connecting to test database, but got err=%+v", err))
-		// CREATE DATABASE gorm;
-		// GRANT ALL ON gorm.* TO 'gorm'@'localhost';
-		fmt.Println("testing mysql...")
-		DB, err = gorm.Open("mysql", "gorm:gorm@/gorm?charset=utf8&parseTime=True")
-	case "postgres":
-		fmt.Println("testing postgres...")
-		DB, err = gorm.Open("postgres", "user=gorm DB.name=gorm sslmode=disable")
-	case "foundation":
-		fmt.Println("testing foundation...")
-		DB, err = gorm.Open("foundation", "dbname=gorm port=15432 sslmode=disable")
-	case "mssql":
-		fmt.Println("testing mssql...")
-		DB, err = gorm.Open("mssql", "server=SERVER_HERE;database=rogue;user id=USER_HERE;password=PW_HERE;port=1433")
-	default:
-		fmt.Println("testing sqlite3...")
-		DB, err = gorm.Open("sqlite3", "/tmp/gorm.db")
 	}
 
 	// DB.SetLogger(Logger{log.New(os.Stdout, "\r\n", 0)})
@@ -52,15 +36,35 @@ func init() {
 	DB.LogMode(true)
 	DB.LogMode(false)
 
-	if err != nil {
-		panic(fmt.Sprintf("No error should happen when connect database, but got %+v", err))
-	}
-
 	DB.DB().SetMaxIdleConns(10)
 
 	runMigration()
 }
 
+func OpenTestConnection() (db gorm.DB, err error) {
+	switch os.Getenv("GORM_DIALECT") {
+	case "mysql":
+		// CREATE USER 'gorm'@'localhost' IDENTIFIED BY 'gorm';
+		// CREATE DATABASE gorm;
+		// GRANT ALL ON gorm.* TO 'gorm'@'localhost';
+		fmt.Println("testing mysql...")
+		db, err = gorm.Open("mysql", "gorm:gorm@/gorm?charset=utf8&parseTime=True")
+	case "postgres":
+		fmt.Println("testing postgres...")
+		db, err = gorm.Open("postgres", "user=gorm DB.name=gorm sslmode=disable")
+	case "foundation":
+		fmt.Println("testing foundation...")
+		db, err = gorm.Open("foundation", "dbname=gorm port=15432 sslmode=disable")
+	case "mssql":
+		fmt.Println("testing mssql...")
+		db, err = gorm.Open("mssql", "server=SERVER_HERE;database=rogue;user id=USER_HERE;password=PW_HERE;port=1433")
+	default:
+		fmt.Println("testing sqlite3...")
+		db, err = gorm.Open("sqlite3", "/tmp/gorm.db")
+	}
+	return
+}
+
 func TestStringPrimaryKey(t *testing.T) {
 	type UUIDStruct struct {
 		ID   string `gorm:"primary_key"`

mssql.go

@@ -56,7 +56,7 @@ func (s mssql) HasTable(scope *Scope, tableName string) bool {
 		databaseName string
 	)
 	s.CurrentDatabase(scope, &databaseName)
-	scope.NewDB().Raw("SELECT count(*) FROM INFORMATION_SCHEMA.tables WHERE table_name = ? AND table_catalog = ?", tableName, databaseName).Row().Scan(&count)
+	s.RawScanInt(scope, &count, "SELECT count(*) FROM INFORMATION_SCHEMA.tables WHERE table_name = ? AND table_catalog = ?", tableName, databaseName)
 	return count > 0
 }
 
@@ -66,16 +66,16 @@ func (s mssql) HasColumn(scope *Scope, tableName string, columnName string) bool
 		databaseName string
 	)
 	s.CurrentDatabase(scope, &databaseName)
-	scope.NewDB().Raw("SELECT count(*) FROM information_schema.columns WHERE table_catalog = ? AND table_name = ? AND column_name = ?", databaseName, tableName, columnName).Row().Scan(&count)
+	s.RawScanInt(scope, &count, "SELECT count(*) FROM information_schema.columns WHERE table_catalog = ? AND table_name = ? AND column_name = ?", databaseName, tableName, columnName)
 	return count > 0
 }
 
-func (mssql) HasIndex(scope *Scope, tableName string, indexName string) bool {
+func (s mssql) HasIndex(scope *Scope, tableName string, indexName string) bool {
 	var count int
-	scope.NewDB().Raw("SELECT count(*) FROM sys.indexes WHERE name=? AND object_id=OBJECT_ID(?)", indexName, tableName).Row().Scan(&count)
+	s.RawScanInt(scope, &count, "SELECT count(*) FROM sys.indexes WHERE name=? AND object_id=OBJECT_ID(?)", indexName, tableName)
 	return count > 0
 }
 
-func (mssql) CurrentDatabase(scope *Scope, name *string) {
+func (s mssql) CurrentDatabase(scope *Scope, name *string) {
-	scope.Err(scope.NewDB().Raw("SELECT DB_NAME() AS [Current Database]").Row().Scan(name))
+	s.RawScanString(scope, name, "SELECT DB_NAME() AS [Current Database]")
 }

mysql.go

@@ -64,6 +64,6 @@ func (mysql) SelectFromDummyTable() string {
 	return "FROM DUAL"
 }
 
-func (mysql) CurrentDatabase(scope *Scope, name *string) {
+func (s mysql) CurrentDatabase(scope *Scope, name *string) {
-	scope.Err(scope.NewDB().Raw("SELECT DATABASE()").Row().Scan(name))
+	s.RawScanString(scope, name, "SELECT DATABASE()")
 }

postgres.go

@@ -63,30 +63,30 @@ func (s postgres) ReturningStr(tableName, key string) string {
 	return fmt.Sprintf("RETURNING %v.%v", s.Quote(tableName), key)
 }
 
-func (postgres) HasTable(scope *Scope, tableName string) bool {
+func (s postgres) HasTable(scope *Scope, tableName string) bool {
 	var count int
-	scope.NewDB().Raw("SELECT count(*) FROM INFORMATION_SCHEMA.tables WHERE table_name = ? AND table_type = 'BASE TABLE'", tableName).Row().Scan(&count)
+	s.RawScanInt(scope, &count, "SELECT count(*) FROM INFORMATION_SCHEMA.tables WHERE table_name = ? AND table_type = 'BASE TABLE'", tableName)
 	return count > 0
 }
 
-func (postgres) HasColumn(scope *Scope, tableName string, columnName string) bool {
+func (s postgres) HasColumn(scope *Scope, tableName string, columnName string) bool {
 	var count int
-	scope.NewDB().Raw("SELECT count(*) FROM INFORMATION_SCHEMA.columns WHERE table_name = ? AND column_name = ?", tableName, columnName).Row().Scan(&count)
+	s.RawScanInt(scope, &count, "SELECT count(*) FROM INFORMATION_SCHEMA.columns WHERE table_name = ? AND column_name = ?", tableName, columnName)
 	return count > 0
 }
 
 func (postgres) RemoveIndex(scope *Scope, indexName string) {
-	scope.NewDB().Exec(fmt.Sprintf("DROP INDEX %v", indexName))
+	scope.Err(scope.NewDB().Exec(fmt.Sprintf("DROP INDEX %v", indexName)).Error)
 }
 
-func (postgres) HasIndex(scope *Scope, tableName string, indexName string) bool {
+func (s postgres) HasIndex(scope *Scope, tableName string, indexName string) bool {
 	var count int
-	scope.NewDB().Raw("SELECT count(*) FROM pg_indexes WHERE tablename = ? AND indexname = ?", tableName, indexName).Row().Scan(&count)
+	s.RawScanInt(scope, &count, "SELECT count(*) FROM pg_indexes WHERE tablename = ? AND indexname = ?", tableName, indexName)
 	return count > 0
 }
 
-func (postgres) CurrentDatabase(scope *Scope, name *string) {
+func (s postgres) CurrentDatabase(scope *Scope, name *string) {
-	scope.Err(scope.NewDB().Raw("SELECT CURRENT_DATABASE()").Row().Scan(name))
+	s.RawScanString(scope, name, "SELECT CURRENT_DATABASE()")
 }
 
 var hstoreType = reflect.TypeOf(Hstore{})

sqlite3.go

@@ -40,26 +40,26 @@ func (sqlite3) SqlTag(value reflect.Value, size int, autoIncrease bool) string {
 	panic(fmt.Sprintf("invalid sql type %s (%s) for sqlite3", value.Type().Name(), value.Kind().String()))
 }
 
-func (sqlite3) HasTable(scope *Scope, tableName string) bool {
+func (s sqlite3) HasTable(scope *Scope, tableName string) bool {
 	var count int
-	scope.NewDB().Raw("SELECT count(*) FROM sqlite_master WHERE type='table' AND name=?", tableName).Row().Scan(&count)
+	s.RawScanInt(scope, &count, "SELECT count(*) FROM sqlite_master WHERE type='table' AND name=?", tableName)
 	return count > 0
 }
 
-func (sqlite3) HasColumn(scope *Scope, tableName string, columnName string) bool {
+func (s sqlite3) HasColumn(scope *Scope, tableName string, columnName string) bool {
 	var count int
-	scope.NewDB().Raw(fmt.Sprintf("SELECT count(*) FROM sqlite_master WHERE tbl_name = ? AND (sql LIKE '%%(\"%v\" %%' OR sql LIKE '%%,\"%v\" %%' OR sql LIKE '%%( %v %%' OR sql LIKE '%%, %v %%');\n", columnName, columnName, columnName, columnName), tableName).Row().Scan(&count)
+	s.RawScanInt(scope, &count, fmt.Sprintf("SELECT count(*) FROM sqlite_master WHERE tbl_name = ? AND (sql LIKE '%%(\"%v\" %%' OR sql LIKE '%%,\"%v\" %%' OR sql LIKE '%%( %v %%' OR sql LIKE '%%, %v %%');\n", columnName, columnName, columnName, columnName), tableName)
 	return count > 0
 }
 
-func (sqlite3) HasIndex(scope *Scope, tableName string, indexName string) bool {
+func (s sqlite3) HasIndex(scope *Scope, tableName string, indexName string) bool {
 	var count int
-	scope.NewDB().Raw(fmt.Sprintf("SELECT count(*) FROM sqlite_master WHERE tbl_name = ? AND sql LIKE '%%INDEX %v ON%%'", indexName), tableName).Row().Scan(&count)
+	s.RawScanInt(scope, &count, fmt.Sprintf("SELECT count(*) FROM sqlite_master WHERE tbl_name = ? AND sql LIKE '%%INDEX %v ON%%'", indexName), tableName)
 	return count > 0
 }
 
 func (sqlite3) RemoveIndex(scope *Scope, indexName string) {
-	scope.NewDB().Exec(fmt.Sprintf("DROP INDEX %v", indexName))
+	scope.Err(scope.NewDB().Exec(fmt.Sprintf("DROP INDEX %v", indexName)).Error)
 }
 
 func (sqlite3) CurrentDatabase(scope *Scope, name *string) {