forked from mirror/gorm
135 lines
3.6 KiB
Go
135 lines
3.6 KiB
Go
package gorm
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import (
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"crypto/sha1"
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"fmt"
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"reflect"
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"regexp"
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"strings"
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"time"
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)
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type mysql struct {
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commonDialect
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}
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func init() {
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RegisterDialect("mysql", &mysql{})
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}
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func (mysql) GetName() string {
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return "mysql"
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}
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func (mysql) Quote(key string) string {
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return fmt.Sprintf("`%s`", key)
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}
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// Get Data Type for MySQL Dialect
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func (mysql) DataTypeOf(field *StructField) string {
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var dataValue, sqlType, size, additionalType = ParseFieldStructForDialect(field)
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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:
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if _, ok := field.TagSettings["AUTO_INCREMENT"]; ok || field.IsPrimaryKey {
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field.TagSettings["AUTO_INCREMENT"] = "AUTO_INCREMENT"
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sqlType = "int AUTO_INCREMENT"
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} else {
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sqlType = "int"
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}
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uintptr:
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if _, ok := field.TagSettings["AUTO_INCREMENT"]; ok || field.IsPrimaryKey {
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field.TagSettings["AUTO_INCREMENT"] = "AUTO_INCREMENT"
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sqlType = "int unsigned AUTO_INCREMENT"
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} else {
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sqlType = "int unsigned"
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}
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case reflect.Int64:
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if _, ok := field.TagSettings["AUTO_INCREMENT"]; ok || field.IsPrimaryKey {
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field.TagSettings["AUTO_INCREMENT"] = "AUTO_INCREMENT"
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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.Uint64:
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if _, ok := field.TagSettings["AUTO_INCREMENT"]; ok || field.IsPrimaryKey {
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field.TagSettings["AUTO_INCREMENT"] = "AUTO_INCREMENT"
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sqlType = "bigint unsigned AUTO_INCREMENT"
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} else {
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sqlType = "bigint unsigned"
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}
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case reflect.Float32, reflect.Float64:
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sqlType = "double"
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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 = "longtext"
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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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if _, ok := field.TagSettings["NOT NULL"]; ok {
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sqlType = "timestamp"
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} else {
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sqlType = "timestamp NULL"
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}
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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("varbinary(%d)", size)
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} else {
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sqlType = "longblob"
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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 mysql", 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 mysql) RemoveIndex(tableName string, indexName string) error {
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_, err := s.db.Exec(fmt.Sprintf("DROP INDEX %v ON %v", indexName, s.Quote(tableName)))
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return err
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}
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func (s mysql) HasForeignKey(tableName string, foreignKeyName string) bool {
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var count int
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s.db.QueryRow("SELECT count(*) FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS WHERE CONSTRAINT_SCHEMA=? AND TABLE_NAME=? AND CONSTRAINT_NAME=? AND CONSTRAINT_TYPE='FOREIGN KEY'", s.currentDatabase(), tableName, foreignKeyName).Scan(&count)
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return count > 0
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}
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func (s mysql) 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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func (mysql) SelectFromDummyTable() string {
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return "FROM DUAL"
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}
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func (s mysql) BuildForeignKeyName(tableName, field, dest string) string {
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keyName := s.commonDialect.BuildForeignKeyName(tableName, field, dest)
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if len(keyName) <= 64 {
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return keyName
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}
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h := sha1.New()
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h.Write([]byte(keyName))
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bs := h.Sum(nil)
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// sha1 is 40 digits, keep first 24 characters of destination
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keyName = regexp.MustCompile("(_*[^a-zA-Z]+_*|_+)").ReplaceAllString(dest, "_")
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return fmt.Sprintf("%s%x", keyName[:24], bs)
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}
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