实际需求
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< if test = "computationRule == '1'" > FROM app_sz_bbb a </ if > < if test = "computationRule == '2'" > FROM app_ccc a </ if > |
这种情况不生效,
原因:mybatis是用OGNL表达式来解析的,在OGNL的表达式中,'0'会被解析成字符,java是强类型的,char 和 一个string 会导致不等,所以if标签中的sql不会被解析。
先说怎么解决
三种:
加 .toString()
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< if test = "computationRule == '1'.toString()" > FROM app_sz_bbb a </ if > < if test = "computationRule == '2'.toString()" > FROM app_ccc a </ if > |
choose when 标签代替
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< choose > < when test = "computationRule == '1'" > FROM app_sz_bbb a </ when > < otherwise > FROM app_sz_bbb a </ otherwise > </ choose > |
单引号 换成双引号
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< if test = 'computationRule == "1"' > FROM app_sz_bbb a </ if > < if test = 'computationRule == "2"' > FROM app_ccc a </ if > |
MyBatis 中if 标签 判断字符串不生效
异常sql 的mapper 文件:
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< if test = "isBound != null and isBound !='' and isBound == '1'" > and box_sid is not null </ if > < if test = "isBound != null and isBound !='' and isBound == '2'" > and box_sid is null </ if > |
正确sql 的mapper 文件
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< if test = "isBound != null and isBound !='' and isBound == '1'.toString()" > and box_sid is not null </ if > < if test = "isBound != null and isBound !='' and isBound == '2'.toString()" > and box_sid is null </ if > |
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原文链接:https://blog.csdn.net/qq_43167632/article/details/110189333