support get db version in conn

pkg/datasource/sql/conn.go

@@ -248,6 +248,13 @@ func (c *Conn) GetAutoCommit() bool {
 	return c.autoCommit
 }
 
+func (c *Conn) GetDbVersion() string {
+	if c.res == nil {
+		return ""
+	}
+	return c.res.GetDbVersion()
+}
+
 // Close invalidates and potentially stops any current
 // prepared statements and transactions, marking this
 // connection as no longer in use.

pkg/datasource/sql/conn_at.go

@@ -63,6 +63,7 @@ func (c *ATConn) QueryContext(ctx context.Context, query string, args []driver.N
 			NamedValues:          args,
 			Conn:                 c.targetConn,
 			DBName:               c.dbName,
+			DbVersion:            c.GetDbVersion(),
 			IsSupportsSavepoints: true,
 			IsAutoCommit:         c.GetAutoCommit(),
 		}
@@ -102,6 +103,7 @@ func (c *ATConn) ExecContext(ctx context.Context, query string, args []driver.Na
 			NamedValues:          args,
 			Conn:                 c.targetConn,
 			DBName:               c.dbName,
+			DbVersion:            c.GetDbVersion(),
 			IsSupportsSavepoints: true,
 			IsAutoCommit:         c.GetAutoCommit(),
 		}

pkg/datasource/sql/types/types.go

@@ -159,6 +159,7 @@ type ExecContext struct {
 	Conn        driver.Conn
 	DBName      string
 	DBType      DBType
+	DbVersion   string
 	// todo set values for these 4 param
 	IsAutoCommit         bool
 	IsSupportsSavepoints bool