解决MyBatis-Plus使用动态表名selectPage不生效的问题
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使用MyBatis-Plus 我们需要安装各种插件，比如官网提供的一些分页插件等。插件的安装请参考官网，声明一下我的配置
以下是报错信息：
org.springframework.jdbc.BadSqlGrammarException: ### Error querying database. Cause: java.sql.SQLSyntaxErrorException: Table 'dataBaseName.delivery_file_print_log' doesn't exist ### The error may exist in XXMapper.java (best guess) ### The error may involve defaultParameterMap ### The error occurred while setting parameters ### SQL: SELECT COUNT(*) FROM delivery_file_print_log WHERE (status = ?) ### Cause: java.sql.SQLSyntaxErrorException: Table 'dataBaseName.delivery_file_print_log' doesn't exist ; bad SQL grammar []; nested exception is java.sql.SQLSyntaxErrorException: Table 'dataBaseName.delivery_file_print_log' doesn't exist at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.doTranslate(SQLErrorCodeSQLExceptionTranslator.java:239) at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:70) at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:91) at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:441) at com.sun.proxy.$Proxy192.selectList(Unknown Source) at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:224) at com.baomidou.mybatisplus.core.override.MybatisMapperMethod.executeForIPage(MybatisMapperMethod.java:121) at com.baomidou.mybatisplus.core.override.MybatisMapperMethod.execute(MybatisMapperMethod.java:85) at com.baomidou.mybatisplus.core.override.MybatisMapperProxy$PlainMethodInvoker.invoke(MybatisMapperProxy.java:148) at com.baomidou.mybatisplus.core.override.MybatisMapperProxy.invoke(MybatisMapperProxy.java:89) at com.sun.proxy.$Proxy277.selectPage(Unknown Source) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:344) at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:198) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) at org.springframework.validation.beanvalidation.MethodValidationInterceptor.invoke(MethodValidationInterceptor.java:123) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:215) at com.sun.proxy.$Proxy278.selectPage(Unknown Source) at com.banksteel.delivery.buy.service.BasicServiceTest.testEmail(BasicServiceTest.java:117) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:74) at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:84) at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75) at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86) at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97) at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329) at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293) at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70) at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306) at org.junit.runners.ParentRunner.run(ParentRunner.java:413) at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190) at org.junit.runner.JUnitCore.run(JUnitCore.java:137) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69) at com.intellij.rt.junit.IdeaTestRunner$Repeater$1.execute(IdeaTestRunner.java:38) at com.intellij.rt.execution.junit.TestsRepeater.repeat(TestsRepeater.java:11) at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:35) at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:232) at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:55)
以下是我的项目mybaltis—plus的插件配置
```java
/**
* MyBatis配置
*/
@Configuration(proxyBeanMethods = false)
public static class MyBatisConfig {
@Bean
public MybatisPlusInterceptor mybatisPlusInterceptor(DeliveryProperties props) {
MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();
// 增加 SQL阻断解析器，防止全表update、delete
interceptor.addInnerInterceptor(new BlockAttackInnerInterceptor());
DynamicTableNameInnerInterceptor dynamicTableNameInnerInterceptor = new DynamicTableNameInnerInterceptor();
// 动态表名
dynamicTableNameInnerInterceptor.setTableNameHandler((sql, tableName) -> {
// 获取参数方法
if ("delivery_file_print_log".equals(tableName)) {
tableName = tableName + "_" +getYear();
}
return tableName;
});
interceptor.addInnerInterceptor(dynamicTableNameInnerInterceptor);
// 乐观锁插件 @version
interceptor.addInnerInterceptor(new OptimisticLockerInnerInterceptor());
// 分页插件
PaginationInnerInterceptor pagination = new PaginationInnerInterceptor(DbType.MYSQL);
// 设置最大单页限制数量，默认不限制
pagination.setMaxLimit(props.getMaxLimitByPage());
// 设置请求的页面大于最大页后操作， true调回到首页，false 继续请求 默认false
// pagination.setOverflow(false)
interceptor.addInnerInterceptor(pagination);
return interceptor;
}
public static String getYear() {
Calendar calendar = Calendar.getInstance();
int yearInt = calendar.get(Calendar.YEAR);
return String.valueOf(yearInt).substring(2);
}
}
其中我需要对delivery_file_print_log的库实现动态表名的查询，比如今年是23年，那么查询的库表应该是delivery_file_print_log_23。 经过多次测试，selectById 或者 selectList方法都是可以正常查询的，但是selectPage会报错如上，具体的原因是拦截器的顺序导致的问题
com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor#intercept 在每执行一次sql查询的时候，都会遍历一次加载的拦截器
因为是List，所以第一个使用的是分页查询拦截器 com.baomidou.mybatisplus.extension.plugins.inner.PaginationInnerInterceptor#willDoQuery
分页查询的拦截器里面会进行一次查询操作，这个地方会查询数据库，导致报错。
解决方案：将拦截器的顺序调整，分页拦截器调整在动态表名拦截器之后，完美解决问题。
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