forked from mirror/gorm
197 lines
5.7 KiB
Go
197 lines
5.7 KiB
Go
package gorm
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import (
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"fmt"
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"reflect"
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"regexp"
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"strconv"
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"strings"
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"time"
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)
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var keyNameRegex = regexp.MustCompile("[^a-zA-Z0-9]+")
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// DefaultForeignKeyNamer contains the default foreign key name generator method
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type DefaultForeignKeyNamer struct {
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}
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type commonDialect struct {
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db SQLCommon
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DefaultForeignKeyNamer
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}
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func init() {
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RegisterDialect("common", &commonDialect{})
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}
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func (commonDialect) GetName() string {
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return "common"
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}
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func (s *commonDialect) SetDB(db SQLCommon) {
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s.db = db
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}
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func (commonDialect) BindVar(i int) string {
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return "$$$" // ?
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}
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func (commonDialect) Quote(key string) string {
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return fmt.Sprintf(`"%s"`, key)
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}
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func (s *commonDialect) fieldCanAutoIncrement(field *StructField) bool {
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if value, ok := field.TagSettingsGet("AUTO_INCREMENT"); ok {
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return strings.ToLower(value) != "false"
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}
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return field.IsPrimaryKey
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}
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func (s *commonDialect) DataTypeOf(field *StructField) string {
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var dataValue, sqlType, size, additionalType = ParseFieldStructForDialect(field, s)
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if sqlType == "" {
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switch dataValue.Kind() {
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case reflect.Bool:
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sqlType = "BOOLEAN"
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uintptr:
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if s.fieldCanAutoIncrement(field) {
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sqlType = "INTEGER AUTO_INCREMENT"
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} else {
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sqlType = "INTEGER"
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}
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case reflect.Int64, reflect.Uint64:
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if s.fieldCanAutoIncrement(field) {
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sqlType = "BIGINT AUTO_INCREMENT"
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} else {
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sqlType = "BIGINT"
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}
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case reflect.Float32, reflect.Float64:
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sqlType = "FLOAT"
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case reflect.String:
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if size > 0 && size < 65532 {
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sqlType = fmt.Sprintf("VARCHAR(%d)", size)
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} else {
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sqlType = "VARCHAR(65532)"
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}
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case reflect.Struct:
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if _, ok := dataValue.Interface().(time.Time); ok {
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sqlType = "TIMESTAMP"
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}
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default:
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if _, ok := dataValue.Interface().([]byte); ok {
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if size > 0 && size < 65532 {
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sqlType = fmt.Sprintf("BINARY(%d)", size)
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} else {
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sqlType = "BINARY(65532)"
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}
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}
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}
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}
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if sqlType == "" {
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panic(fmt.Sprintf("invalid sql type %s (%s) for commonDialect", dataValue.Type().Name(), dataValue.Kind().String()))
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}
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if strings.TrimSpace(additionalType) == "" {
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return sqlType
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}
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return fmt.Sprintf("%v %v", sqlType, additionalType)
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}
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func (s commonDialect) HasIndex(tableName string, indexName string) bool {
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var count int
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currentDatabase, tableName := currentDatabaseAndTable(&s, tableName)
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s.db.QueryRow("SELECT count(*) FROM INFORMATION_SCHEMA.STATISTICS WHERE table_schema = ? AND table_name = ? AND index_name = ?", currentDatabase, tableName, indexName).Scan(&count)
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return count > 0
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}
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func (s commonDialect) RemoveIndex(tableName string, indexName string) error {
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_, err := s.db.Exec(fmt.Sprintf("DROP INDEX %v", indexName))
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return err
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}
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func (s commonDialect) HasForeignKey(tableName string, foreignKeyName string) bool {
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return false
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}
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func (s commonDialect) HasTable(tableName string) bool {
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var count int
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currentDatabase, tableName := currentDatabaseAndTable(&s, tableName)
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s.db.QueryRow("SELECT count(*) FROM INFORMATION_SCHEMA.TABLES WHERE table_schema = ? AND table_name = ?", currentDatabase, tableName).Scan(&count)
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return count > 0
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}
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func (s commonDialect) HasColumn(tableName string, columnName string) bool {
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var count int
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currentDatabase, tableName := currentDatabaseAndTable(&s, tableName)
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s.db.QueryRow("SELECT count(*) FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema = ? AND table_name = ? AND column_name = ?", currentDatabase, tableName, columnName).Scan(&count)
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return count > 0
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}
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func (s commonDialect) ModifyColumn(tableName string, columnName string, typ string) error {
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_, err := s.db.Exec(fmt.Sprintf("ALTER TABLE %v ALTER COLUMN %v TYPE %v", tableName, columnName, typ))
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return err
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}
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func (s commonDialect) CurrentDatabase() (name string) {
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s.db.QueryRow("SELECT DATABASE()").Scan(&name)
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return
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}
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// LimitAndOffsetSQL return generated SQL with Limit and Offset
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func (s commonDialect) LimitAndOffsetSQL(limit, offset interface{}) (sql string, err error) {
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if limit != nil {
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if parsedLimit, err := s.parseInt(limit); err != nil {
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return "", err
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} else if parsedLimit >= 0 {
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sql += fmt.Sprintf(" LIMIT %d", parsedLimit)
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}
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}
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if offset != nil {
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if parsedOffset, err := s.parseInt(offset); err != nil {
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return "", err
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} else if parsedOffset >= 0 {
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sql += fmt.Sprintf(" OFFSET %d", parsedOffset)
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}
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}
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return
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}
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func (commonDialect) SelectFromDummyTable() string {
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return ""
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}
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func (commonDialect) LastInsertIDOutputInterstitial(tableName, columnName string, columns []string) string {
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return ""
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}
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func (commonDialect) LastInsertIDReturningSuffix(tableName, columnName string) string {
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return ""
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}
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func (commonDialect) DefaultValueStr() string {
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return "DEFAULT VALUES"
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}
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// BuildKeyName returns a valid key name (foreign key, index key) for the given table, field and reference
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func (DefaultForeignKeyNamer) BuildKeyName(kind, tableName string, fields ...string) string {
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keyName := fmt.Sprintf("%s_%s_%s", kind, tableName, strings.Join(fields, "_"))
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keyName = keyNameRegex.ReplaceAllString(keyName, "_")
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return keyName
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}
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// NormalizeIndexAndColumn returns argument's index name and column name without doing anything
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func (commonDialect) NormalizeIndexAndColumn(indexName, columnName string) (string, string) {
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return indexName, columnName
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}
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func (commonDialect) parseInt(value interface{}) (int64, error) {
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return strconv.ParseInt(fmt.Sprint(value), 0, 0)
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}
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// IsByteArrayOrSlice returns true of the reflected value is an array or slice
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func IsByteArrayOrSlice(value reflect.Value) bool {
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return (value.Kind() == reflect.Array || value.Kind() == reflect.Slice) && value.Type().Elem() == reflect.TypeOf(uint8(0))
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}
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