解决 Could not set parameters for mapping: ParameterMapping{property=‘state‘, mode=IN, javaType=class

╰半夏微凉° 2024-02-05 13:34 47阅读 0赞

#### 文章目录 ####

*  一. 问题描述
 *  二. Bug复现
 *  三. 原因分析
 *  四. 解决方案

--------------------

## 一. 问题描述 ##

当我们用mybatis-plus书写sql语句时，sql 中模糊查询里使用\#\{\} 替换传入的变量时，发生了报错

![在这里插入图片描述][40d699518da140f7b845bcc6095080d6.png]

报错堆栈信息如下所示：

2023-12-08 19:23:58.576 ERROR 16024 --- [nio-9036-exec-2] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.type.TypeException: Could not set parameters for mapping: ParameterMapping{
        property='state', mode=IN, javaType=class java.lang.Object, jdbcType=null, numericScale=null, resultMapId='null', jdbcTypeName='null', expression='null'}. Cause: org.apache.ibatis.type.TypeException: Error setting non null for parameter #1 with JdbcType null . Try setting a different JdbcType for this parameter or a different configuration property. Cause: org.apache.ibatis.type.TypeException: Error setting non null for parameter #1 with JdbcType null . Try setting a different JdbcType for this parameter or a different configuration property. Cause: dm.jdbc.driver.DMException: 序列号无效] with root cause
    
    dm.jdbc.driver.DMException: 序列号无效
    	at dm.jdbc.driver.DBError.throwException(DBError.java:700) ~[DmJdbcDriver18.jar:- 8.1.1.134 - Production]
    	at dm.jdbc.driver.DmdbPreparedStatement.prepareBindInParam(DmdbPreparedStatement.java:593) ~[DmJdbcDriver18.jar:- 8.1.1.134 - Production]
    	at dm.jdbc.driver.DmdbPreparedStatement.do_setString(DmdbPreparedStatement.java:746) ~[DmJdbcDriver18.jar:- 8.1.1.134 - Production]
    	at dm.jdbc.driver.DmdbPreparedStatement.setString(DmdbPreparedStatement.java:1641) ~[DmJdbcDriver18.jar:- 8.1.1.134 - Production]
    	at com.alibaba.druid.pool.DruidPooledPreparedStatement.setString(DruidPooledPreparedStatement.java:369) ~[druid-1.1.16.jar:1.1.16]
    	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_161]
    	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_161]
    	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_161]
    	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_161]
    	at org.apache.ibatis.logging.jdbc.PreparedStatementLogger.invoke(PreparedStatementLogger.java:67) ~[mybatis-3.5.6.jar:3.5.6]
    	at com.sun.proxy.$Proxy319.setString(Unknown Source) ~[na:na]
    	at org.apache.ibatis.type.StringTypeHandler.setNonNullParameter(StringTypeHandler.java:31) ~[mybatis-3.5.6.jar:3.5.6]
    	at org.apache.ibatis.type.StringTypeHandler.setNonNullParameter(StringTypeHandler.java:26) ~[mybatis-3.5.6.jar:3.5.6]
    	at org.apache.ibatis.type.BaseTypeHandler.setParameter(BaseTypeHandler.java:73) ~[mybatis-3.5.6.jar:3.5.6]
    	at org.apache.ibatis.type.UnknownTypeHandler.setNonNullParameter(UnknownTypeHandler.java:67) ~[mybatis-3.5.6.jar:3.5.6]
    	at org.apache.ibatis.type.BaseTypeHandler.setParameter(BaseTypeHandler.java:73) ~[mybatis-3.5.6.jar:3.5.6]
    	at com.baomidou.mybatisplus.core.MybatisParameterHandler.setParameters(MybatisParameterHandler.java:213) ~[mybatis-plus-core-3.4.1.jar:3.4.1]
    	at org.apache.ibatis.executor.statement.PreparedStatementHandler.parameterize(PreparedStatementHandler.java:94) ~[mybatis-3.5.6.jar:3.5.6]
    	at org.apache.ibatis.executor.statement.RoutingStatementHandler.parameterize(RoutingStatementHandler.java:64) ~[mybatis-3.5.6.jar:3.5.6]
    	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_161]
    	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_161]
    	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_161]
    	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_161]
    	at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:63) ~[mybatis-3.5.6.jar:3.5.6]
    	at com.sun.proxy.$Proxy317.parameterize(Unknown Source) ~[na:na]
    	at com.baomidou.mybatisplus.core.executor.MybatisSimpleExecutor.prepareStatement(MybatisSimpleExecutor.java:99) ~[mybatis-plus-core-3.4.1.jar:3.4.1]
    	at com.baomidou.mybatisplus.core.executor.MybatisSimpleExecutor.doQuery(MybatisSimpleExecutor.java:68) ~[mybatis-plus-core-3.4.1.jar:3.4.1]
    	at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:325) ~[mybatis-3.5.6.jar:3.5.6]
    	at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156) ~[mybatis-3.5.6.jar:3.5.6]
    	at com.baomidou.mybatisplus.core.executor.MybatisCachingExecutor.query(MybatisCachingExecutor.java:165) ~[mybatis-plus-core-3.4.1.jar:3.4.1]
    	at com.baomidou.mybatisplus.core.executor.MybatisCachingExecutor.query(MybatisCachingExecutor.java:92) ~[mybatis-plus-core-3.4.1.jar:3.4.1]
    	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:147) ~[mybatis-3.5.6.jar:3.5.6]
    	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:140) ~[mybatis-3.5.6.jar:3.5.6]
    	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_161]
    	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_161]
    	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_161]
    	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_161]
    	at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:426) ~[mybatis-spring-2.0.5.jar:2.0.5]
    	at com.sun.proxy.$Proxy109.selectList(Unknown Source) ~[na:na]
    	at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:223) ~[mybatis-spring-2.0.5.jar:2.0.5]
    	at com.baomidou.mybatisplus.core.override.MybatisMapperMethod.executeForMany(MybatisMapperMethod.java:173) ~[mybatis-plus-core-3.4.1.jar:3.4.1]
    	at com.baomidou.mybatisplus.core.override.MybatisMapperMethod.execute(MybatisMapperMethod.java:78) ~[mybatis-plus-core-3.4.1.jar:3.4.1]
    	at com.baomidou.mybatisplus.core.override.MybatisMapperProxy$PlainMethodInvoker.invoke(MybatisMapperProxy.java:148) ~[mybatis-plus-core-3.4.1.jar:3.4.1]
    	at com.baomidou.mybatisplus.core.override.MybatisMapperProxy.invoke(MybatisMapperProxy.java:89) ~[mybatis-plus-core-3.4.1.jar:3.4.1]
    	at com.sun.proxy.$Proxy138.exportUsedconfirm(Unknown Source) ~[na:na]
    	at com.yxkj.dxyq.service.serviceImpl.UsedconfirmServiceImpl.exportUsedconfirm(UsedconfirmServiceImpl.java:833) ~[classes/:na]
    	at com.yxkj.dxyq.service.serviceImpl.UsedconfirmServiceImpl$$FastClassBySpringCGLIB$$c5781d43.invoke(<generated>) ~[classes/:na]
    	at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) ~[spring-core-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:684) ~[spring-aop-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at com.yxkj.dxyq.service.serviceImpl.UsedconfirmServiceImpl$$EnhancerBySpringCGLIB$$90268d56.exportUsedconfirm(<generated>) ~[classes/:na]
    	at com.yxkj.dxyq.controller.UsedconfirmController.export(UsedconfirmController.java:120) ~[classes/:na]
    	at com.yxkj.dxyq.controller.UsedconfirmController$$FastClassBySpringCGLIB$$eac8d7cc.invoke(<generated>) ~[classes/:na]
    	at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) ~[spring-core-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:746) ~[spring-aop-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:52) ~[spring-aop-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:174) ~[spring-aop-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) ~[spring-aop-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) ~[spring-aop-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:688) ~[spring-aop-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at com.yxkj.dxyq.controller.UsedconfirmController$$EnhancerBySpringCGLIB$$a0d8b16c.export(<generated>) ~[classes/:na]
    	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_161]
    	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_161]
    	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_161]
    	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_161]
    	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102) ~[spring-webmvc-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:877) ~[spring-webmvc-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:783) ~[spring-webmvc-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991) ~[spring-webmvc-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925) ~[spring-webmvc-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974) ~[spring-webmvc-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:866) ~[spring-webmvc-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at javax.servlet.http.HttpServlet.service(HttpServlet.java:635) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
    	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851) ~[spring-webmvc-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
    	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
    	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
    	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) ~[tomcat-embed-websocket-8.5.31.jar:8.5.31]
    	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
    	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
    	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
    	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
    	at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
    	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
    	at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
    	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
    	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
    	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
    	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) ~[tomcat-embed-core-8.5.31.jar:8.5.31]
    	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-8.5.31.jar:8.5.31]
    	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:496) [tomcat-embed-core-8.5.31.jar:8.5.31]
    	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [tomcat-embed-core-8.5.31.jar:8.5.31]
    	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) [tomcat-embed-core-8.5.31.jar:8.5.31]
    	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [tomcat-embed-core-8.5.31.jar:8.5.31]
    	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) [tomcat-embed-core-8.5.31.jar:8.5.31]
    	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803) [tomcat-embed-core-8.5.31.jar:8.5.31]
    	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-8.5.31.jar:8.5.31]
    	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:790) [tomcat-embed-core-8.5.31.jar:8.5.31]
    	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1468) [tomcat-embed-core-8.5.31.jar:8.5.31]
    	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.31.jar:8.5.31]
    	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_161]
    	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_161]
    	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.5.31.jar:8.5.31]
    	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_161]

--------------------

## 二. Bug复现 ##

> **1. 测试数据准备如下**

![在这里插入图片描述][9e08f05f8f044165b07c20e60cd0aea9.png]

> **2.测试代码准备如下**

①controller包代码如下

@GetMapping("/getStuentByName")
        public List<Student> getStuentByName(){
        
            String name = "龙";
            return studentService.getStuentByName(name);
        }

②service包及Impl包代码如下

//service包代码
    public interface StudentService extends IService<Student> {
        
    
        List<Student> getStuentByName(String name);
    }

//Impl包代码
    @Service
    public class StudentServiceImpl extends ServiceImpl<StudentMapper, Student> implements StudentService {
        
    
        @Resource
        private StudentMapper studentMapper;
    
        @Override
        public List<Student> getStuentByName(String name) {
        
            return studentMapper.getStudentsByName(name);
        }
    }

③mapper包代码如下

public interface StudentMapper extends BaseMapper<Student> {
        
    
        @Select("select * from student where sname like '%#{name}%'")
        List<Student> getStudentsByName(@Param("name") String name);
    
    }

> **3.运行测试**

![在这里插入图片描述][48335a8590564cf381f9e9f7d1e52858.png]

**`和第一节里红框中报错信息完全一致!!!`**

如果把上述mapper包中 \#\{\} 换成 $\{\} ，会执行成功吗？

![在这里插入图片描述][eb6792f524324c96a453fe7a53d94f62.png]

![在这里插入图片描述][64816a8b25934d538c99793a2bae095a.png]

**执行成功了，问题的确出在\#\{\} 的使用上**

--------------------

## 三. 原因分析 ##

众所周知，**$\{\}** 和 **\#\{\}** 都是**mybatis**或**mybatis-plus**中用来替换参数的，它们都可以将用户传递过来的参数，并替换到最终生成的sql中。它们的执行区别在于

*  **`${}`**：**用于直接插入字符串值，不进行任何转义或替换。当使用 $\{\} 时，mybatis 或 mybatis-plus会将参数值原样拼接到sql语句中，可能导致sql注入风险。因此，在使用时应确保参数值是安全的**
 *  **`#{}`**：**用于预编译参数，可以有效防止sql注入。当使用 \#\{\} 时，mybatis 或 mybatis-plus会对参数值进行转义和替换，将其与sql语句分开处理，从而保证安全性**

**但在参数值的转义与替换上**

如果参数为数值类型时（在不考虑安全问题的前提下），$\{\} 和 \#\{\} 的执行效果都是一样的，然而当参数的类型为字符时，再使用 $\{\} 就有问题

> **①参数为数值类型**

*  **使用\#\{\}时**

![在这里插入图片描述][68736798f3c54201bf56f9fc42e6a95e.png]  
![在这里插入图片描述][f25b82ca10a34e4c98e1e40f94622f3a.png]

*  **使用$\{\}时**

![在这里插入图片描述][b410df926afc41bba4eff69279e0931a.png]  
![在这里插入图片描述][782237031bcf4d86b6928398e190d202.png]

> **②参数为字符类型，使用\#\{\}时，会给值添加单引号，而使用$\{\}时，会直接替换**

*  **使用\#\{\}时**  
    ![在这里插入图片描述][4a3fcb9d37234fbb9bd81f34867a344a.png]  
    ![在这里插入图片描述][5fd6be6fb54c43d9b5fb68fbf8aee73d.png]
 *  **使用$\{\}时**  
    ![在这里插入图片描述][c72a1fc87d864700aed09c86ff96e35e.png]  
    ![在这里插入图片描述][6e7b4c453d9540909d3ab9008f8bad4b.png]

分析

> **在sql的语法中，如果是字符类型需要给值添加单引号，否则就会报错，而 $\{\} 是直接替换，在占位符外面已有成对的单引号，符合模糊查询的语法规范，而使用\#\{\}  
> 会自动添加单引号，加上外面已有成对的单引号，所以执行就报错了。**

**`所以问题就出在#{}替换这一步`**

--------------------

## 四. 解决方案 ##

> **结合上述分析，将\#\{\}替换为$\{\}即可**

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