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package gorm
import (
"crypto/sha1"
"fmt"
"reflect"
"regexp"
"strconv"
"strings"
"time"
"unicode/utf8"
)
type mysql struct {
commonDialect
}
func init() {
RegisterDialect("mysql", &mysql{})
}
func (mysql) GetName() string {
return "mysql"
}
func (mysql) Quote(key string) string {
return fmt.Sprintf("`%s`", key)
}
// Get Data Type for MySQL Dialect
func (s *mysql) DataTypeOf(field *StructField) string {
var dataValue, sqlType, size, additionalType = ParseFieldStructForDialect(field, s)
// MySQL allows only one auto increment column per table, and it must
// be a KEY column.
if _, ok := field.TagSettingsGet("AUTO_INCREMENT"); ok {
if _, ok = field.TagSettingsGet("INDEX"); !ok && !field.IsPrimaryKey {
field.TagSettingsDelete("AUTO_INCREMENT")
}
}
if sqlType == "" {
switch dataValue.Kind() {
case reflect.Bool:
sqlType = "boolean"
case reflect.Int8:
if s.fieldCanAutoIncrement(field) {
field.TagSettingsSet("AUTO_INCREMENT", "AUTO_INCREMENT")
sqlType = "tinyint AUTO_INCREMENT"
} else {
sqlType = "tinyint"
}
case reflect.Int, reflect.Int16, reflect.Int32:
if s.fieldCanAutoIncrement(field) {
field.TagSettingsSet("AUTO_INCREMENT", "AUTO_INCREMENT")
sqlType = "int AUTO_INCREMENT"
} else {
sqlType = "int"
}
case reflect.Uint8:
if s.fieldCanAutoIncrement(field) {
field.TagSettingsSet("AUTO_INCREMENT", "AUTO_INCREMENT")
sqlType = "tinyint unsigned AUTO_INCREMENT"
} else {
sqlType = "tinyint unsigned"
}
case reflect.Uint, reflect.Uint16, reflect.Uint32, reflect.Uintptr:
if s.fieldCanAutoIncrement(field) {
field.TagSettingsSet("AUTO_INCREMENT", "AUTO_INCREMENT")
sqlType = "int unsigned AUTO_INCREMENT"
} else {
sqlType = "int unsigned"
}
case reflect.Int64:
if s.fieldCanAutoIncrement(field) {
field.TagSettingsSet("AUTO_INCREMENT", "AUTO_INCREMENT")
sqlType = "bigint AUTO_INCREMENT"
} else {
sqlType = "bigint"
}
case reflect.Uint64:
if s.fieldCanAutoIncrement(field) {
field.TagSettingsSet("AUTO_INCREMENT", "AUTO_INCREMENT")
sqlType = "bigint unsigned AUTO_INCREMENT"
} else {
sqlType = "bigint unsigned"
}
case reflect.Float32, reflect.Float64:
sqlType = "double"
case reflect.String:
if size > 0 && size < 65532 {
sqlType = fmt.Sprintf("varchar(%d)", size)
} else {
sqlType = "longtext"
}
case reflect.Struct:
if _, ok := dataValue.Interface().(time.Time); ok {
precision := ""
if p, ok := field.TagSettingsGet("PRECISION"); ok {
precision = fmt.Sprintf("(%s)", p)
}
if _, ok := field.TagSettingsGet("NOT NULL"); ok {
sqlType = fmt.Sprintf("timestamp%v", precision)
} else {
sqlType = fmt.Sprintf("timestamp%v NULL", precision)
}
}
default:
if IsByteArrayOrSlice(dataValue) {
if size > 0 && size < 65532 {
sqlType = fmt.Sprintf("varbinary(%d)", size)
} else {
sqlType = "longblob"
}
}
}
}
if sqlType == "" {
panic(fmt.Sprintf("invalid sql type %s (%s) for mysql", dataValue.Type().Name(), dataValue.Kind().String()))
}
if strings.TrimSpace(additionalType) == "" {
return sqlType
}
return fmt.Sprintf("%v %v", sqlType, additionalType)
}
func (s mysql) RemoveIndex(tableName string, indexName string) error {
_, err := s.db.Exec(fmt.Sprintf("DROP INDEX %v ON %v", indexName, s.Quote(tableName)))
return err
}
func (s mysql) ModifyColumn(tableName string, columnName string, typ string) error {
_, err := s.db.Exec(fmt.Sprintf("ALTER TABLE %v MODIFY COLUMN %v %v", tableName, columnName, typ))
return err
}
func (s mysql) 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 (s mysql) HasForeignKey(tableName string, foreignKeyName string) bool {
var count int
currentDatabase, tableName := currentDatabaseAndTable(&s, tableName)
s.db.QueryRow("SELECT count(*) FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS WHERE CONSTRAINT_SCHEMA=? AND TABLE_NAME=? AND CONSTRAINT_NAME=? AND CONSTRAINT_TYPE='FOREIGN KEY'", currentDatabase, tableName, foreignKeyName).Scan(&count)
return count > 0
}
func (s mysql) CurrentDatabase() (name string) {
s.db.QueryRow("SELECT DATABASE()").Scan(&name)
return
}
func (mysql) SelectFromDummyTable() string {
return "FROM DUAL"
}
func (s mysql) BuildKeyName(kind, tableName string, fields ...string) string {
keyName := s.commonDialect.BuildKeyName(kind, tableName, fields...)
if utf8.RuneCountInString(keyName) <= 64 {
return keyName
}
h := sha1.New()
h.Write([]byte(keyName))
bs := h.Sum(nil)
// sha1 is 40 characters, keep first 24 characters of destination
destRunes := []rune(regexp.MustCompile("[^a-zA-Z0-9]+").ReplaceAllString(fields[0], "_"))
if len(destRunes) > 24 {
destRunes = destRunes[:24]
}
return fmt.Sprintf("%s%x", string(destRunes), bs)
}
func (mysql) DefaultValueStr() string {
return "VALUES()"
}