(springboot2.0.1、pagehelper5.1.4）

pagehelper联表分页，会默认在sql语句的后面添加 limit ?，进行分页。如果是复杂的sql联表查询结果远远不能满足我们，添加 limit在我们想要的位置进行分页，下面的代码中“AS limitable”，为分页标识的sql. 末尾带有 AS limitable 的子查询会拼接上limit进行先分页.然后再外联查询

import java.lang.reflect.Field;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Properties;

import org.apache.ibatis.cache.CacheKey;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.ParameterMapping;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.plugin.Intercepts;
import org.apache.ibatis.plugin.Invocation;
import org.apache.ibatis.plugin.Plugin;
import org.apache.ibatis.plugin.Signature;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;

import com.github.pagehelper.Dialect;
import com.github.pagehelper.PageException;
import com.github.pagehelper.cache.Cache;
import com.github.pagehelper.cache.CacheFactory;
import com.github.pagehelper.util.MSUtils;
import com.github.pagehelper.util.StringUtil;


@SuppressWarnings({ "rawtypes", "unchecked" })
@Intercepts({
		@Signature(type = Executor.class, method = "query", args = { MappedStatement.class, Object.class,
				RowBounds.class, ResultHandler.class }),
		@Signature(type = Executor.class, method = "query", args = { MappedStatement.class, Object.class,
				RowBounds.class, ResultHandler.class, CacheKey.class, BoundSql.class }), })
public class MumuPageInterceptor implements Interceptor {
	//private static final Logger logger = LoggerFactory.getLogger(MumuPageInterceptor.class);

	// 缓存count查询的ms
	protected Cache<String, MappedStatement> msCountMap = null;
	private Dialect dialect;
	private String default_dialect_class = "com.github.pagehelper.PageHelper";
	private Field additionalParametersField;
	private String countSuffix = "_COUNT";

	@Override
	public Object intercept(Invocation invocation) throws Throwable {
		try {
			Object[] args = invocation.getArgs();
			MappedStatement ms = (MappedStatement) args[0];
			Object parameter = args[1];
			RowBounds rowBounds = (RowBounds) args[2];
			ResultHandler resultHandler = (ResultHandler) args[3];
			Executor executor = (Executor) invocation.getTarget();
			CacheKey cacheKey;
			BoundSql boundSql;
			// 由于逻辑关系，只会进入一次
			if (args.length == 4) {
				// 4 个参数时
				boundSql = ms.getBoundSql(parameter);
				cacheKey = executor.createCacheKey(ms, parameter, rowBounds, boundSql);
			} else {
				// 6 个参数时
				cacheKey = (CacheKey) args[4];
				boundSql = (BoundSql) args[5];
			}
			List resultList;
			// 调用方法判断是否需要进行分页&#