12 // DefaultForeignKeyNamer contains the default foreign key name generator method
13 type DefaultForeignKeyNamer struct {
16 type commonDialect struct {
18 DefaultForeignKeyNamer
22 RegisterDialect("common", &commonDialect{})
25 func (commonDialect) GetName() string {
29 func (s *commonDialect) SetDB(db SQLCommon) {
33 func (commonDialect) BindVar(i int) string {
37 func (commonDialect) Quote(key string) string {
38 return fmt.Sprintf(`"%s"`, key)
41 func (s *commonDialect) fieldCanAutoIncrement(field *StructField) bool {
42 if value, ok := field.TagSettingsGet("AUTO_INCREMENT"); ok {
43 return strings.ToLower(value) != "false"
45 return field.IsPrimaryKey
48 func (s *commonDialect) DataTypeOf(field *StructField) string {
49 var dataValue, sqlType, size, additionalType = ParseFieldStructForDialect(field, s)
52 switch dataValue.Kind() {
55 case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uintptr:
56 if s.fieldCanAutoIncrement(field) {
57 sqlType = "INTEGER AUTO_INCREMENT"
61 case reflect.Int64, reflect.Uint64:
62 if s.fieldCanAutoIncrement(field) {
63 sqlType = "BIGINT AUTO_INCREMENT"
67 case reflect.Float32, reflect.Float64:
70 if size > 0 && size < 65532 {
71 sqlType = fmt.Sprintf("VARCHAR(%d)", size)
73 sqlType = "VARCHAR(65532)"
76 if _, ok := dataValue.Interface().(time.Time); ok {
80 if _, ok := dataValue.Interface().([]byte); ok {
81 if size > 0 && size < 65532 {
82 sqlType = fmt.Sprintf("BINARY(%d)", size)
84 sqlType = "BINARY(65532)"
91 panic(fmt.Sprintf("invalid sql type %s (%s) for commonDialect", dataValue.Type().Name(), dataValue.Kind().String()))
94 if strings.TrimSpace(additionalType) == "" {
97 return fmt.Sprintf("%v %v", sqlType, additionalType)
100 func (s commonDialect) HasIndex(tableName string, indexName string) bool {
102 currentDatabase, tableName := currentDatabaseAndTable(&s, tableName)
103 s.db.QueryRow("SELECT count(*) FROM INFORMATION_SCHEMA.STATISTICS WHERE table_schema = ? AND table_name = ? AND index_name = ?", currentDatabase, tableName, indexName).Scan(&count)
107 func (s commonDialect) RemoveIndex(tableName string, indexName string) error {
108 _, err := s.db.Exec(fmt.Sprintf("DROP INDEX %v", indexName))
112 func (s commonDialect) HasForeignKey(tableName string, foreignKeyName string) bool {
116 func (s commonDialect) HasTable(tableName string) bool {
118 currentDatabase, tableName := currentDatabaseAndTable(&s, tableName)
119 s.db.QueryRow("SELECT count(*) FROM INFORMATION_SCHEMA.TABLES WHERE table_schema = ? AND table_name = ?", currentDatabase, tableName).Scan(&count)
123 func (s commonDialect) HasColumn(tableName string, columnName string) bool {
125 currentDatabase, tableName := currentDatabaseAndTable(&s, tableName)
126 s.db.QueryRow("SELECT count(*) FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema = ? AND table_name = ? AND column_name = ?", currentDatabase, tableName, columnName).Scan(&count)
130 func (s commonDialect) ModifyColumn(tableName string, columnName string, typ string) error {
131 _, err := s.db.Exec(fmt.Sprintf("ALTER TABLE %v ALTER COLUMN %v TYPE %v", tableName, columnName, typ))
135 func (s commonDialect) CurrentDatabase() (name string) {
136 s.db.QueryRow("SELECT DATABASE()").Scan(&name)
140 func (commonDialect) LimitAndOffsetSQL(limit, offset interface{}) (sql string) {
142 if parsedLimit, err := strconv.ParseInt(fmt.Sprint(limit), 0, 0); err == nil && parsedLimit >= 0 {
143 sql += fmt.Sprintf(" LIMIT %d", parsedLimit)
147 if parsedOffset, err := strconv.ParseInt(fmt.Sprint(offset), 0, 0); err == nil && parsedOffset >= 0 {
148 sql += fmt.Sprintf(" OFFSET %d", parsedOffset)
154 func (commonDialect) SelectFromDummyTable() string {
158 func (commonDialect) LastInsertIDReturningSuffix(tableName, columnName string) string {
162 func (commonDialect) DefaultValueStr() string {
163 return "DEFAULT VALUES"
166 // BuildKeyName returns a valid key name (foreign key, index key) for the given table, field and reference
167 func (DefaultForeignKeyNamer) BuildKeyName(kind, tableName string, fields ...string) string {
168 keyName := fmt.Sprintf("%s_%s_%s", kind, tableName, strings.Join(fields, "_"))
169 keyName = regexp.MustCompile("[^a-zA-Z0-9]+").ReplaceAllString(keyName, "_")
173 // IsByteArrayOrSlice returns true of the reflected value is an array or slice
174 func IsByteArrayOrSlice(value reflect.Value) bool {
175 return (value.Kind() == reflect.Array || value.Kind() == reflect.Slice) && value.Type().Elem() == reflect.TypeOf(uint8(0))