MSSQL Create() fix: Add LastInsertIDReturningSuffix to dialect (#2690)

* MSSQL Create() fix: Add LastInsertIDReturningSuffix to dialect

Per https://github.com/denisenkom/go-mssqldb/issues/355

* MSSQL Create() fix: Added OUTPUT query to Create() builder

callback_create.go

@@ -101,10 +101,11 @@ func createCallback(scope *Scope) {
 		}
 
 		lastInsertIDReturningSuffix := scope.Dialect().LastInsertIDReturningSuffix(quotedTableName, returningColumn)
+		lastInsertIDOutputInterstitial := scope.Dialect().LastInsertIDOutputInterstitial(quotedTableName, returningColumn, columns)
 
 		if len(columns) == 0 {
 			scope.Raw(fmt.Sprintf(
-				"INSERT %v INTO %v %v%v%v",
+				"INSERT%v INTO %v %v%v%v",
 				addExtraSpaceIfExist(insertModifier),
 				quotedTableName,
 				scope.Dialect().DefaultValueStr(),
@@ -113,18 +114,19 @@ func createCallback(scope *Scope) {
 			))
 		} else {
 			scope.Raw(fmt.Sprintf(
-				"INSERT %v INTO %v (%v) VALUES (%v)%v%v",
+				"INSERT%v INTO %v (%v)%v VALUES (%v)%v%v",
 				addExtraSpaceIfExist(insertModifier),
 				scope.QuotedTableName(),
 				strings.Join(columns, ","),
+				addExtraSpaceIfExist(lastInsertIDOutputInterstitial),
 				strings.Join(placeholders, ","),
 				addExtraSpaceIfExist(extraOption),
 				addExtraSpaceIfExist(lastInsertIDReturningSuffix),
 			))
 		}
 
-		// execute create sql
-		if lastInsertIDReturningSuffix == "" || primaryField == nil {
+		// execute create sql: no primaryField
+		if primaryField == nil {
 			if result, err := scope.SQLDB().Exec(scope.SQL, scope.SQLVars...); scope.Err(err) == nil {
 				// set rows affected count
 				scope.db.RowsAffected, _ = result.RowsAffected()
@@ -136,7 +138,26 @@ func createCallback(scope *Scope) {
 					}
 				}
 			}
-		} else {
+			return
+		}
+
+		// execute create sql: lastInsertID implemention for majority of dialects
+		if lastInsertIDReturningSuffix == "" && lastInsertIDOutputInterstitial == "" {
+			if result, err := scope.SQLDB().Exec(scope.SQL, scope.SQLVars...); scope.Err(err) == nil {
+				// set rows affected count
+				scope.db.RowsAffected, _ = result.RowsAffected()
+
+				// set primary value to primary field
+				if primaryField != nil && primaryField.IsBlank {
+					if primaryValue, err := result.LastInsertId(); scope.Err(err) == nil {
+						scope.Err(primaryField.Set(primaryValue))
+					}
+				}
+			}
+			return
+		}
+
+		// execute create sql: dialects with additional lastInsertID requirements (currently postgres & mssql)
 		if primaryField.Field.CanAddr() {
 			if err := scope.SQLDB().QueryRow(scope.SQL, scope.SQLVars...).Scan(primaryField.Field.Addr().Interface()); scope.Err(err) == nil {
 				primaryField.IsBlank = false
@@ -145,7 +166,7 @@ func createCallback(scope *Scope) {
 		} else {
 			scope.Err(ErrUnaddressable)
 		}
-		}
+		return
 	}
 }
 

dialect.go

@@ -40,6 +40,8 @@ type Dialect interface {
 	LimitAndOffsetSQL(limit, offset interface{}) string
 	// SelectFromDummyTable return select values, for most dbs, `SELECT values` just works, mysql needs `SELECT value FROM DUAL`
 	SelectFromDummyTable() string
+	// LastInsertIDOutputInterstitial most dbs support LastInsertId, but mssql needs to use `OUTPUT`
+	LastInsertIDOutputInterstitial(tableName, columnName string, columns []string) string
 	// LastInsertIdReturningSuffix most dbs support LastInsertId, but postgres needs to use `RETURNING`
 	LastInsertIDReturningSuffix(tableName, columnName string) string
 	// DefaultValueStr

dialect_common.go

@@ -157,6 +157,10 @@ func (commonDialect) SelectFromDummyTable() string {
 	return ""
 }
 
+func (commonDialect) LastInsertIDOutputInterstitial(tableName, columnName string, columns []string) string {
+	return ""
+}
+
 func (commonDialect) LastInsertIDReturningSuffix(tableName, columnName string) string {
 	return ""
 }

dialect_postgres.go

@@ -120,6 +120,10 @@ func (s postgres) CurrentDatabase() (name string) {
 	return
 }
 
+func (s postgres) LastInsertIDOutputInterstitial(tableName, key string, columns []string) string {
+	return ""
+}
+
 func (s postgres) LastInsertIDReturningSuffix(tableName, key string) string {
 	return fmt.Sprintf("RETURNING %v.%v", tableName, key)
 }

dialects/mssql/mssql.go

@@ -190,6 +190,14 @@ func (mssql) SelectFromDummyTable() string {
 	return ""
 }
 
+func (mssql) LastInsertIDOutputInterstitial(tableName, columnName string, columns []string) string {
+	if len(columns) == 0 {
+		// No OUTPUT to query
+		return ""
+	}
+	return fmt.Sprintf("OUTPUT Inserted.%v", columnName)
+}
+
 func (mssql) LastInsertIDReturningSuffix(tableName, columnName string) string {
 	return ""
 }