fix: 机器文件下载问题修复&dbm重构

server/internal/db/dbm/dm/meta.go

@@ -0,0 +1,51 @@
+package dm
+
+import (
+	"database/sql"
+	"fmt"
+	"mayfly-go/internal/db/dbm/dbi"
+	"strings"
+	"sync"
+)
+
+var (
+	meta dbi.Meta
+	once sync.Once
+)
+
+func GetMeta() dbi.Meta {
+	once.Do(func() {
+		meta = new(DmMeta)
+	})
+	return meta
+}
+
+type DmMeta struct {
+}
+
+func (md *DmMeta) GetSqlDb(d *dbi.DbInfo) (*sql.DB, error) {
+	driverName := "dm"
+	db := d.Database
+	var dbParam string
+	if db != "" {
+		// dm database可以使用db/schema表示，方便连接指定schema, 若不存在schema则使用默认schema
+		ss := strings.Split(db, "/")
+		if len(ss) > 1 {
+			dbParam = fmt.Sprintf("%s?schema=%s", ss[0], ss[len(ss)-1])
+		} else {
+			dbParam = db
+		}
+	}
+
+	err := d.IfUseSshTunnelChangeIpPort()
+	if err != nil {
+		return nil, err
+	}
+
+	dsn := fmt.Sprintf("dm://%s:%s@%s:%d/%s", d.Username, d.Password, d.Host, d.Port, dbParam)
+	return sql.Open(driverName, dsn)
+}
+
+func (md *DmMeta) GetDialect(conn *dbi.DbConn) dbi.Dialect {
+	return &DMDialect{conn}
+}