synced/gorm
1
0
Fork 0
mirror of https://github.com/go-gorm/gorm.git synced 2025-04-04 10:17:30 +00:00
Code Issues Packages Projects Releases Wiki Activity

optimize MigrateColumn method for regexp (#4188)

Browse Source
This commit is contained in:
heige
2021-03-17 11:32:17 +08:00
committed by GitHub
parent 2055e29eb8
commit 07f3795f93
1 changed files with 9 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
migrator/migrator.go
View File

@ -12,6 +12,11 @@ import (
"gorm.io/gorm/schema"
)
var (
regRealDataType = regexp.MustCompile(`[^\d](\d+)[^\d]?`)
regFullDataType = regexp.MustCompile(`[^\d]*(\d+)[^\d]?`)
)
// Migrator m struct
type Migrator struct {
Config
@ -373,8 +378,10 @@ func (m Migrator) MigrateColumn(value interface{}, field *schema.Field, columnTy
alterColumn = true
} else {
// has size in data type and not equal
matches := regexp.MustCompile(`[^\d](\d+)[^\d]?`).FindAllStringSubmatch(realDataType, -1)
matches2 := regexp.MustCompile(`[^\d]*(\d+)[^\d]?`).FindAllStringSubmatch(fullDataType, -1)
// Since the following code is frequently called in the for loop, reg optimization is needed here
matches := regRealDataType.FindAllStringSubmatch(realDataType, -1)
matches2 := regFullDataType.FindAllStringSubmatch(fullDataType, -1)
if (len(matches) == 1 && matches[0][1] != fmt.Sprint(field.Size) || !field.PrimaryKey) && (len(matches2) == 1 && matches2[0][1] != fmt.Sprint(length)) {
alterColumn = true
}