本文为博主原创,未经允许不得而转载:

异常展示:

dao层定义的接口为:

public int getClientTotal();

在mybatis中的sql为:

<select id="getClientTotal" parameterType="String" resultType="Integer">
SELECT COUNT(*) AS oldNum FROM tbl__client_info
<where>
<if test="zoneId!=null and !&quot;&quot;.equals(zoneId.trim())">
and zone1Id = #{zoneId}
</if>
</where>
</select>

在运行的时候控制台报一下异常:

Caused by: org.apache.ibatis.reflection.ReflectionException: There is no getter for property named 'zoneId' in 'class java.lang.String'
at org.apache.ibatis.reflection.Reflector.getGetInvoker(Reflector.java:422) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.reflection.MetaClass.getGetInvoker(MetaClass.java:164) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.reflection.wrapper.BeanWrapper.getBeanProperty(BeanWrapper.java:162) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.reflection.wrapper.BeanWrapper.get(BeanWrapper.java:49) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.reflection.MetaObject.getValue(MetaObject.java:122) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.scripting.xmltags.DynamicContext$ContextMap.get(DynamicContext.java:94) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.scripting.xmltags.DynamicContext$ContextAccessor.getProperty(DynamicContext.java:108) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.ognl.OgnlRuntime.getProperty(OgnlRuntime.java:2666) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.ognl.ASTProperty.getValueBody(ASTProperty.java:114) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.ognl.SimpleNode.getValue(SimpleNode.java:258) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.ognl.ASTNotEq.getValueBody(ASTNotEq.java:50) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.ognl.SimpleNode.getValue(SimpleNode.java:258) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.ognl.ASTAnd.getValueBody(ASTAnd.java:61) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.ognl.SimpleNode.evaluateGetValueBody(SimpleNode.java:212) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.ognl.SimpleNode.getValue(SimpleNode.java:258) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.ognl.Ognl.getValue(Ognl.java:467) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.ognl.Ognl.getValue(Ognl.java:431) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.scripting.xmltags.OgnlCache.getValue(OgnlCache.java:44) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.scripting.xmltags.ExpressionEvaluator.evaluateBoolean(ExpressionEvaluator.java:32) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.scripting.xmltags.IfSqlNode.apply(IfSqlNode.java:34) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.scripting.xmltags.MixedSqlNode.apply(MixedSqlNode.java:33) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.scripting.xmltags.TrimSqlNode.apply(TrimSqlNode.java:55) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.scripting.xmltags.MixedSqlNode.apply(MixedSqlNode.java:33) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.scripting.xmltags.DynamicSqlSource.getBoundSql(DynamicSqlSource.java:41) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.mapping.MappedStatement.getBoundSql(MappedStatement.java:292) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:81) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141) ~[mybatis-3.4.2.jar:3.4.2]
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:77) ~[mybatis-3.4.2.jar:3.4.2]
at sun.reflect.GeneratedMethodAccessor90.invoke(Unknown Source) ~[na:na]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_121]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_121]
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433) ~[mybatis-spring-1.3.1.jar:1.3.1]
... 52 common frames omitted

错误分析及解决方法:

错误原因:在于sql中test="zoneId!=null and !&quot;&quot;.equals(zoneId.trim())"条件判断,在mybatis解析sql的时候,会将test中的属性解析为bean的

属性,mybatis解析获取值的时候通过getProperty的方法获取,同理,当sql从数据库查到数值,将属性值赋值给属性的时候通过setProperty方法。由于

mybatis将接口中的String参数解析为bean属性,就需要有set,get方法,set,get方法一般都写在实体类中,接口中的属性可以通过@Param()注解来实现

set,get方法。

修改方法:

public int getClientTotal(@Param("zoneId")String zoneId);

然后重新启动就ok了。

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