mybatis类型别名

别名	      映射的类型
_byte	      byte
_long	      long
_short	      short
_int	      int
_integer      int
_double	      double
_float	      float
_boolean      boolean
string        String
byte	      Byte
long	      Long
short	      Short
int	      Integer
integer	      Integer
double	      Double
float	      Float
boolean	      Boolean
date	      Date
decimal	      BigDecimal
bigdecimal    BigDecimal
object	      Object
map	      Map
hashmap	      HashMap
list	      List
arraylist     ArrayList
collection    Collection
iterator      Iterator