Indicates whether this SQLServerConnection object is in read-only mode.
注意：
This method is not currently supported by the Microsoft SQL Server 2005 JDBC Driver.
语法
public boolean isReadOnly()
返回值
true if the connection is in read-only mode, false if it is not.
异常
备注
This isReadOnly method is specified by the isReadOnly method in the java.sql.Connection interface.