mybatis-plus分页插件使用

依赖版本

  		<dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus</artifactId><version>3.5.1</version></dependency>

配置分页插件

 @Beanpublic MybatisPlusInterceptor mybatisPlusInterceptor() {MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();interceptor.addInnerInterceptor(new PaginationInnerInterceptor(DbType.MYSQL));return interceptor;}

注册插件

	@Beanpublic SqlSessionFactory sqlSessionFactory(DataSource dataSource) throws Exception {MybatisSqlSessionFactoryBean sqlSessionFactory = new MybatisSqlSessionFactoryBean();sqlSessionFactory.setDataSource(dataSource);sqlSessionFactory.setMapperLocations(resolveMapperLocations());MybatisConfiguration configuration = new MybatisConfiguration();configuration.setDefaultScriptingLanguage(MybatisXMLLanguageDriver.class);configuration.setJdbcTypeForNull(JdbcType.NULL);configuration.setMapUnderscoreToCamelCase(true);//注册分页插件、有其他自定义插件也可在此注册到configuration.addInterceptor(mybatisPlusInterceptor());sqlSessionFactory.setConfiguration(configuration);return sqlSessionFactory.getObject();}public Resource[] resolveMapperLocations() {ResourcePatternResolver resourceResolver = new PathMatchingResourcePatternResolver();List<String> mapperLocations = new ArrayList<>();mapperLocations.add("classpath*:mybatis/mapper/*.xml");List<Resource> resources = new ArrayList();if (mapperLocations != null) {for (String mapperLocation : mapperLocations) {try {Resource[] mappers = resourceResolver.getResources(mapperLocation);System.out.println("mappers "+mappers.length);resources.addAll(Arrays.asList(mappers));} catch (IOException e) {// ignore}}}return resources.toArray(new Resource[resources.size()]);}

自定义插件

import org.apache.ibatis.executor.statement.StatementHandler;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.plugin.*;
import org.springframework.stereotype.Component;
import java.lang.reflect.Field;
import java.sql.Connection;@Intercepts({@Signature(type = StatementHandler.class, method = "prepare", args = {Connection.class, Integer.class})
})
@Component // 确保它是一个Spring管理的Bean，以便在配置类中注入
public class CustomSqlInterceptor implements Interceptor {@Overridepublic Object intercept(Invocation invocation) throws Throwable {StatementHandler statementHandler = (StatementHandler) invocation.getTarget();BoundSql boundSql = statementHandler.getBoundSql();String originalSql = boundSql.getSql();// 这里是你的SQL修改逻辑，例如：String modifiedSql = originalSql + " LIMIT 10";// 通过反射将修改后的SQL设置回去Field sqlField = boundSql.getClass().getDeclaredField("sql");sqlField.setAccessible(true);sqlField.set(boundSql, modifiedSql);// 继续执行后续流程return invocation.proceed();}@Overridepublic Object plugin(Object target) {return Plugin.wrap(target, this);}@Overridepublic void setProperties(Properties properties) {// 如果需要从配置中获取参数，可以在这里处理}
}