package gorm import ( "fmt" "reflect" "time" ) type mssql struct { commonDialect } func (mssql) HasTop() bool { return true } func (mssql) SqlTag(value reflect.Value, size int, autoIncrease bool) string { switch value.Kind() { case reflect.Bool: return "bit" case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uintptr: if autoIncrease { return "int IDENTITY(1,1)" } return "int" case reflect.Int64, reflect.Uint64: if autoIncrease { return "bigint IDENTITY(1,1)" } return "bigint" case reflect.Float32, reflect.Float64: return "float" case reflect.String: if size > 0 && size < 65532 { return fmt.Sprintf("nvarchar(%d)", size) } return "text" case reflect.Struct: if _, ok := value.Interface().(time.Time); ok { return "datetime2" } default: if _, ok := value.Interface().([]byte); ok { if size > 0 && size < 65532 { return fmt.Sprintf("varchar(%d)", size) } return "text" } } panic(fmt.Sprintf("invalid sql type %s (%s) for mssql", value.Type().Name(), value.Kind().String())) } func (s mssql) HasTable(scope *Scope, tableName string) bool { var ( count int databaseName = s.CurrentDatabase(scope) ) s.RawScanInt(scope, &count, "SELECT count(*) FROM INFORMATION_SCHEMA.tables WHERE table_name = ? AND table_catalog = ?", tableName, databaseName) return count > 0 } func (s mssql) HasColumn(scope *Scope, tableName string, columnName string) bool { var ( count int databaseName = s.CurrentDatabase(scope) ) s.RawScanInt(scope, &count, "SELECT count(*) FROM information_schema.columns WHERE table_catalog = ? AND table_name = ? AND column_name = ?", databaseName, tableName, columnName) return count > 0 } func (s mssql) HasIndex(scope *Scope, tableName string, indexName string) bool { var count int s.RawScanInt(scope, &count, "SELECT count(*) FROM sys.indexes WHERE name=? AND object_id=OBJECT_ID(?)", indexName, tableName) return count > 0 } func (s mssql) CurrentDatabase(scope *Scope) (name string) { s.RawScanString(scope, &name, "SELECT DB_NAME() AS [Current Database]") return }