fix: Handle empty character set in MariaDB compatibility (#11082)

Author: ssongliu

agent/utils/mysql/client/info.go

@@ -3,6 +3,7 @@ package client
 import (
 	"crypto/tls"
 	"crypto/x509"
+	"database/sql"
 	"errors"
 
 	"github.com/1Panel-dev/1Panel/agent/global"
@@ -82,8 +83,8 @@ type BackupInfo struct {
 }
 
 type FormatCollation struct {
-	Format    string `json:"format" gorm:"column:CHARACTER_SET_NAME"`
-	Collation string `json:"collation" gorm:"column:COLLATION_NAME"`
+	Format    sql.NullString `json:"format" gorm:"column:CHARACTER_SET_NAME"`
+	Collation sql.NullString `json:"collation" gorm:"column:COLLATION_NAME"`
 }
 
 type RecoverInfo struct {

agent/utils/mysql/client/local.go

@@ -405,6 +405,9 @@ func (r *Local) LoadFormatCollation(timeout uint) ([]dto.MysqlFormatCollationOpt
 		if len(parts) != 2 {
 			continue
 		}
+		if parts[0] == "NULL" {
+			continue
+		}
 		if _, ok := formatMap[parts[0]]; !ok {
 			formatMap[parts[0]] = []string{parts[1]}
 		} else {

agent/utils/mysql/client/remote.go

@@ -421,10 +421,13 @@ func (r *Remote) LoadFormatCollation(timeout uint) ([]dto.MysqlFormatCollationOp
 		if err := rows.Scan(&item.Format, &item.Collation); err != nil {
 			return nil, err
 		}
-		if _, ok := formatMap[item.Format]; !ok {
-			formatMap[item.Format] = []string{item.Collation}
+		if !item.Format.Valid {
+			continue
+		}
+		if _, ok := formatMap[item.Format.String]; !ok {
+			formatMap[item.Format.String] = []string{item.Collation.String}
 		} else {
-			formatMap[item.Format] = append(formatMap[item.Format], item.Collation)
+			formatMap[item.Format.String] = append(formatMap[item.Format.String], item.Collation.String)
 		}
 	}
 	options := []dto.MysqlFormatCollationOption{}