gorm/mysql.go

114 lines
3.0 KiB
Go

package gorm
import (
"fmt"
"strings"
"reflect"
)
type mysql struct{}
func (s *mysql) BinVar(i int) string {
return "$$" // ?
}
func (s *mysql) SupportLastInsertId() bool {
return true
}
func (s *mysql) HasTop() bool {
return false
}
func (d *mysql) SqlTag(value reflect.Value, size int) string {
switch value.Kind() {
case reflect.Bool:
return "boolean"
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uintptr:
return "int"
case reflect.Int64, reflect.Uint64:
return "bigint"
case reflect.Float32, reflect.Float64:
return "double"
case reflect.String:
if size > 0 && size < 65532 {
return fmt.Sprintf("varchar(%d)", size)
} else {
return "longtext"
}
case reflect.Struct:
if value.Type() == timeType {
return "datetime"
}
default:
if _, ok := value.Interface().([]byte); ok {
if size > 0 && size < 65532 {
return fmt.Sprintf("varbinary(%d)", size)
} else {
return "longblob"
}
}
}
panic(fmt.Sprintf("invalid sql type %s (%s) for mysql", value.Type().Name(), value.Kind().String()))
}
func (s *mysql) PrimaryKeyTag(value reflect.Value, size int) string {
suffix_str := " NOT NULL AUTO_INCREMENT PRIMARY KEY"
switch value.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uintptr:
return "int" + suffix_str
case reflect.Int64, reflect.Uint64:
return "bigint" + suffix_str
default:
panic("Invalid primary key type")
}
}
func (s *mysql) ReturningStr(key string) string {
return ""
}
func (s *mysql) SelectFromDummyTable() string {
return "FROM DUAL"
}
func (s *mysql) Quote(key string) string {
return fmt.Sprintf("`%s`", key)
}
func (s *mysql) databaseName(scope *Scope) string {
from := strings.Index(scope.db.parent.source, "/") + 1
to := strings.Index(scope.db.parent.source, "?")
if to == -1 {
to = len(scope.db.parent.source)
}
return scope.db.parent.source[from:to]
}
func (s *mysql) HasTable(scope *Scope, tableName string) bool {
var count int
newScope := scope.New(nil)
newScope.Raw(fmt.Sprintf("SELECT count(*) FROM INFORMATION_SCHEMA.tables where table_name = %v AND table_schema = %v",
newScope.AddToVars(tableName),
newScope.AddToVars(s.databaseName(scope))))
newScope.DB().QueryRow(newScope.Sql, newScope.SqlVars...).Scan(&count)
return count > 0
}
func (s *mysql) HasColumn(scope *Scope, tableName string, columnName string) bool {
var count int
newScope := scope.New(nil)
newScope.Raw(fmt.Sprintf("SELECT count(*) FROM information_schema.columns WHERE table_schema = %v AND table_name = %v AND column_name = %v",
newScope.AddToVars(s.databaseName(scope)),
newScope.AddToVars(tableName),
newScope.AddToVars(columnName),
))
newScope.DB().QueryRow(newScope.Sql, newScope.SqlVars...).Scan(&count)
return count > 0
}
func (s *mysql) RemoveIndex(scope *Scope, indexName string) {
scope.Raw(fmt.Sprintf("DROP INDEX %v ON %v", indexName, scope.QuotedTableName())).Exec()
}