--- /dev/null
+package gorm
+
+import (
+ "fmt"
+ "reflect"
+ "regexp"
+ "strconv"
+ "strings"
+ "time"
+)
+
+// DefaultForeignKeyNamer contains the default foreign key name generator method
+type DefaultForeignKeyNamer struct {
+}
+
+type commonDialect struct {
+ db SQLCommon
+ DefaultForeignKeyNamer
+}
+
+func init() {
+ RegisterDialect("common", &commonDialect{})
+}
+
+func (commonDialect) GetName() string {
+ return "common"
+}
+
+func (s *commonDialect) SetDB(db SQLCommon) {
+ s.db = db
+}
+
+func (commonDialect) BindVar(i int) string {
+ return "$$$" // ?
+}
+
+func (commonDialect) Quote(key string) string {
+ return fmt.Sprintf(`"%s"`, key)
+}
+
+func (s *commonDialect) fieldCanAutoIncrement(field *StructField) bool {
+ if value, ok := field.TagSettingsGet("AUTO_INCREMENT"); ok {
+ return strings.ToLower(value) != "false"
+ }
+ return field.IsPrimaryKey
+}
+
+func (s *commonDialect) DataTypeOf(field *StructField) string {
+ var dataValue, sqlType, size, additionalType = ParseFieldStructForDialect(field, s)
+
+ if sqlType == "" {
+ switch dataValue.Kind() {
+ case reflect.Bool:
+ sqlType = "BOOLEAN"
+ case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uintptr:
+ if s.fieldCanAutoIncrement(field) {
+ sqlType = "INTEGER AUTO_INCREMENT"
+ } else {
+ sqlType = "INTEGER"
+ }
+ case reflect.Int64, reflect.Uint64:
+ if s.fieldCanAutoIncrement(field) {
+ sqlType = "BIGINT AUTO_INCREMENT"
+ } else {
+ sqlType = "BIGINT"
+ }
+ case reflect.Float32, reflect.Float64:
+ sqlType = "FLOAT"
+ case reflect.String:
+ if size > 0 && size < 65532 {
+ sqlType = fmt.Sprintf("VARCHAR(%d)", size)
+ } else {
+ sqlType = "VARCHAR(65532)"
+ }
+ case reflect.Struct:
+ if _, ok := dataValue.Interface().(time.Time); ok {
+ sqlType = "TIMESTAMP"
+ }
+ default:
+ if _, ok := dataValue.Interface().([]byte); ok {
+ if size > 0 && size < 65532 {
+ sqlType = fmt.Sprintf("BINARY(%d)", size)
+ } else {
+ sqlType = "BINARY(65532)"
+ }
+ }
+ }
+ }
+
+ if sqlType == "" {
+ panic(fmt.Sprintf("invalid sql type %s (%s) for commonDialect", dataValue.Type().Name(), dataValue.Kind().String()))
+ }
+
+ if strings.TrimSpace(additionalType) == "" {
+ return sqlType
+ }
+ return fmt.Sprintf("%v %v", sqlType, additionalType)
+}
+
+func (s commonDialect) HasIndex(tableName string, indexName string) bool {
+ var count int
+ currentDatabase, tableName := currentDatabaseAndTable(&s, tableName)
+ s.db.QueryRow("SELECT count(*) FROM INFORMATION_SCHEMA.STATISTICS WHERE table_schema = ? AND table_name = ? AND index_name = ?", currentDatabase, tableName, indexName).Scan(&count)
+ return count > 0
+}
+
+func (s commonDialect) RemoveIndex(tableName string, indexName string) error {
+ _, err := s.db.Exec(fmt.Sprintf("DROP INDEX %v", indexName))
+ return err
+}
+
+func (s commonDialect) HasForeignKey(tableName string, foreignKeyName string) bool {
+ return false
+}
+
+func (s commonDialect) HasTable(tableName string) bool {
+ var count int
+ currentDatabase, tableName := currentDatabaseAndTable(&s, tableName)
+ s.db.QueryRow("SELECT count(*) FROM INFORMATION_SCHEMA.TABLES WHERE table_schema = ? AND table_name = ?", currentDatabase, tableName).Scan(&count)
+ return count > 0
+}
+
+func (s commonDialect) HasColumn(tableName string, columnName string) bool {
+ var count int
+ currentDatabase, tableName := currentDatabaseAndTable(&s, tableName)
+ s.db.QueryRow("SELECT count(*) FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema = ? AND table_name = ? AND column_name = ?", currentDatabase, tableName, columnName).Scan(&count)
+ return count > 0
+}
+
+func (s commonDialect) ModifyColumn(tableName string, columnName string, typ string) error {
+ _, err := s.db.Exec(fmt.Sprintf("ALTER TABLE %v ALTER COLUMN %v TYPE %v", tableName, columnName, typ))
+ return err
+}
+
+func (s commonDialect) CurrentDatabase() (name string) {
+ s.db.QueryRow("SELECT DATABASE()").Scan(&name)
+ return
+}
+
+func (commonDialect) LimitAndOffsetSQL(limit, offset interface{}) (sql string) {
+ if limit != nil {
+ if parsedLimit, err := strconv.ParseInt(fmt.Sprint(limit), 0, 0); err == nil && parsedLimit >= 0 {
+ sql += fmt.Sprintf(" LIMIT %d", parsedLimit)
+ }
+ }
+ if offset != nil {
+ if parsedOffset, err := strconv.ParseInt(fmt.Sprint(offset), 0, 0); err == nil && parsedOffset >= 0 {
+ sql += fmt.Sprintf(" OFFSET %d", parsedOffset)
+ }
+ }
+ return
+}
+
+func (commonDialect) SelectFromDummyTable() string {
+ return ""
+}
+
+func (commonDialect) LastInsertIDReturningSuffix(tableName, columnName string) string {
+ return ""
+}
+
+func (commonDialect) DefaultValueStr() string {
+ return "DEFAULT VALUES"
+}
+
+// BuildKeyName returns a valid key name (foreign key, index key) for the given table, field and reference
+func (DefaultForeignKeyNamer) BuildKeyName(kind, tableName string, fields ...string) string {
+ keyName := fmt.Sprintf("%s_%s_%s", kind, tableName, strings.Join(fields, "_"))
+ keyName = regexp.MustCompile("[^a-zA-Z0-9]+").ReplaceAllString(keyName, "_")
+ return keyName
+}
+
+// IsByteArrayOrSlice returns true of the reflected value is an array or slice
+func IsByteArrayOrSlice(value reflect.Value) bool {
+ return (value.Kind() == reflect.Array || value.Kind() == reflect.Slice) && value.Type().Elem() == reflect.TypeOf(uint8(0))
+}
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