Mybatis条件if test使用枚举值
1.正确
package com.weather.weatherexpert.common.utils;
/**
* <p>Title: </p>
* <p>Description: </p>
*
* @Author
* @CreateTime
*/
public enum City {
XINZHOU(100002,"忻州"),
DATONG(100003,"大同"),
TAIYUAN(100001,"太原");
private final Integer code;
private final String name;
City(Integer value, String desc) {
this.code = value;
this.name = desc;
}
public Integer getCode() {
return code;
}
public String getName() {
return name;
}
}xml：
<!--<if test="cityName == @com.weather.weatherexpert.common.utils.City.XINZHOU@getName"><!–wrong,java.lang.ClassNotFoundException: Unable to resolve class: com.weather.weatherexpert.common.utils.City.XINZHOU–>-->
<!--<if test="cityName == @com.weather.weatherexpert.common.utils.City@XINZHOU@getName"><!–wrong,[org.apache.ibatis.ognl.ParseException: Encountered " "@" "@ "" at line 1, column 65.–>-->
<if test="cityName == @com.weather.weatherexpert.common.utils.City@XINZHOU.getName"><!--right-->
area_table
</if>
where 1=1
<if test="cityName == @com.weather.weatherexpert.common.utils.City@XINZHOU.getName"><!--right-->
and city_name=#{cityName}
</if> 
2.错误
package com.weather.weatherexpert.common.utils;
/**
* <p>Title: </p>
* <p>Description: </p>
*
* @Author
* @CreateTime
*/
public class CityClass {
public static enum CityEnum {
XINZHOU(100002, "忻州"),
DATONG(100003, "大同"),
TAIYUAN(100001, "太原");
private final Integer code;
private final String name;
CityEnum(Integer value, String desc) {
this.code = value;
this.name = desc;
}
public Integer getCode() {
return code;
}
public String getName() {
return name;
}
}
}xml：
/* Caused by: org.apache.ibatis.builder.BuilderException: Error evaluating expression
'cityName == @com.weather.weatherexpert.common.utils.CityClass@CityEnum.XINZHOU.getName'. Cause: org.apache.ibatis.ognl.OgnlException:
Could not get static field CityEnum from class com.weather.weatherexpert.common.utils.CityClass [java.lang.NoSuchFieldException: CityEnum]*/
<if test="cityName == @com.weather.weatherexpert.common.utils.CityClass@CityEnum.XINZHOU.getName"><!--wrong-->
area_table
</if> 可见，直接定义的枚举类可以正常使用，在类中定义的枚举类这样使用会报错，可能方法还没有找到。
如下正确：
<if test="cityName == @com.a.b.c.CityClass$CityEnum@XINZHOU.getName"><!--right-->
name = #{username}
</if>Mybatis里使用枚举Enum判断
<if test="dtEnum == @com.xxx.xxx.TestTypeEnum@HOUR"> DATE_FORMAT(TM,'%Y-%m-%d %H') as keyStr, </if>
TestTypeEnum定义如下
-
HOUR("hour"), -
DAY("day"), -
MONTH("month"), -
YEAR("year");
以上为个人经验，希望能给大家一个参考，也希望大家多多支持Devmax。