diff --git a/src/main/java/demo/catlets/ShareJoin.java b/src/main/java/demo/catlets/ShareJoin.java
index 458caeb3f..b34709995 100644
--- a/src/main/java/demo/catlets/ShareJoin.java
+++ b/src/main/java/demo/catlets/ShareJoin.java
@@ -24,14 +24,6 @@
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
-
-
-
-
-
-
-
-
 //import org.opencloudb.route.RouteStrategy;
 //import org.opencloudb.route.impl.DruidMysqlRouteStrategy;
 //import org.opencloudb.parser.druid.DruidParser;
diff --git a/src/main/java/io/mycat/backend/jdbc/JDBCConnection.java b/src/main/java/io/mycat/backend/jdbc/JDBCConnection.java
index c39326ecd..774e22776 100644
--- a/src/main/java/io/mycat/backend/jdbc/JDBCConnection.java
+++ b/src/main/java/io/mycat/backend/jdbc/JDBCConnection.java
@@ -9,7 +9,12 @@
 import io.mycat.server.MySQLFrontConnection;
 import io.mycat.server.executors.ConnectionHeartBeatHandler;
 import io.mycat.server.executors.ResponseHandler;
-import io.mycat.server.packet.*;
+import io.mycat.server.packet.EOFPacket;
+import io.mycat.server.packet.ErrorPacket;
+import io.mycat.server.packet.FieldPacket;
+import io.mycat.server.packet.OkPacket;
+import io.mycat.server.packet.ResultSetHeaderPacket;
+import io.mycat.server.packet.RowDataPacket;
 import io.mycat.server.parser.ServerParse;
 import io.mycat.server.response.ShowVariables;
 import io.mycat.util.ResultSetUtil;
diff --git a/src/main/java/io/mycat/backend/jdbc/JDBCHeartbeat.java b/src/main/java/io/mycat/backend/jdbc/JDBCHeartbeat.java
index a76877fd4..5c9c32848 100644
--- a/src/main/java/io/mycat/backend/jdbc/JDBCHeartbeat.java
+++ b/src/main/java/io/mycat/backend/jdbc/JDBCHeartbeat.java
@@ -4,7 +4,6 @@
 import io.mycat.backend.heartbeat.DBHeartbeat;
 
 import java.sql.Connection;
-import java.sql.SQLException;
 import java.sql.Statement;
 import java.text.SimpleDateFormat;
 import java.util.Date;
diff --git a/src/main/java/io/mycat/backend/jdbc/mongodb/MongoData.java b/src/main/java/io/mycat/backend/jdbc/mongodb/MongoData.java
index 529eb35be..5ebf81e8c 100644
--- a/src/main/java/io/mycat/backend/jdbc/mongodb/MongoData.java
+++ b/src/main/java/io/mycat/backend/jdbc/mongodb/MongoData.java
@@ -6,9 +6,9 @@
 import java.sql.Types;
 import java.util.HashMap;
 
+import com.mongodb.BasicDBList;
 import com.mongodb.DBCursor;
 import com.mongodb.DBObject;
-import com.mongodb.BasicDBList;
 
 public class MongoData {
 	
diff --git a/src/main/java/io/mycat/backend/jdbc/mongodb/MongoResultSet.java b/src/main/java/io/mycat/backend/jdbc/mongodb/MongoResultSet.java
index d31824097..8013e2a59 100644
--- a/src/main/java/io/mycat/backend/jdbc/mongodb/MongoResultSet.java
+++ b/src/main/java/io/mycat/backend/jdbc/mongodb/MongoResultSet.java
@@ -1,9 +1,5 @@
 package io.mycat.backend.jdbc.mongodb;
 
-import com.mongodb.BasicDBList;
-import com.mongodb.DBCursor;
-import com.mongodb.DBObject;
-
 import java.io.InputStream;
 import java.io.Reader;
 import java.math.BigDecimal;
@@ -30,6 +26,10 @@
 //import java.util.HashMap;
 import java.util.Map;
 import java.util.Set;
+
+import com.mongodb.BasicDBList;
+import com.mongodb.DBCursor;
+import com.mongodb.DBObject;
 /**  
  * 功能详细描述
  * @author sohudo[http://blog.csdn.net/wind520]
diff --git a/src/main/java/io/mycat/backend/jdbc/mongodb/MongoResultSetMetaData.java b/src/main/java/io/mycat/backend/jdbc/mongodb/MongoResultSetMetaData.java
index 92949fadf..52d503115 100644
--- a/src/main/java/io/mycat/backend/jdbc/mongodb/MongoResultSetMetaData.java
+++ b/src/main/java/io/mycat/backend/jdbc/mongodb/MongoResultSetMetaData.java
@@ -4,7 +4,6 @@
 import java.sql.SQLException;
 import java.sql.Types;
 //import java.util.Arrays;
-import java.util.Set;
 /**  
  * 功能详细描述
  * @author sohudo[http://blog.csdn.net/wind520]
diff --git a/src/main/java/io/mycat/backend/jdbc/mongodb/MongoSQLParser.java b/src/main/java/io/mycat/backend/jdbc/mongodb/MongoSQLParser.java
index 225e0802b..dd8544478 100644
--- a/src/main/java/io/mycat/backend/jdbc/mongodb/MongoSQLParser.java
+++ b/src/main/java/io/mycat/backend/jdbc/mongodb/MongoSQLParser.java
@@ -8,21 +8,40 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import com.mongodb.BasicDBList;
-import com.mongodb.BasicDBObject;
-import com.mongodb.DB;
-import com.mongodb.DBCollection;
-import com.mongodb.DBCursor;
-import com.mongodb.DBObject;
 import com.alibaba.druid.sql.ast.SQLExpr;
+import com.alibaba.druid.sql.ast.SQLOrderBy;
 import com.alibaba.druid.sql.ast.SQLOrderingSpecification;
 import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.ast.expr.SQLAggregateExpr;
+import com.alibaba.druid.sql.ast.expr.SQLAllColumnExpr;
+import com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr;
+import com.alibaba.druid.sql.ast.expr.SQLBooleanExpr;
+import com.alibaba.druid.sql.ast.expr.SQLCharExpr;
+import com.alibaba.druid.sql.ast.expr.SQLIntegerExpr;
+import com.alibaba.druid.sql.ast.expr.SQLNullExpr;
+import com.alibaba.druid.sql.ast.expr.SQLNumberExpr;
+import com.alibaba.druid.sql.ast.expr.SQLVariantRefExpr;
+import com.alibaba.druid.sql.ast.statement.SQLCreateTableStatement;
+import com.alibaba.druid.sql.ast.statement.SQLDeleteStatement;
+import com.alibaba.druid.sql.ast.statement.SQLDropTableStatement;
+import com.alibaba.druid.sql.ast.statement.SQLInsertStatement;
+import com.alibaba.druid.sql.ast.statement.SQLSelectGroupByClause;
+import com.alibaba.druid.sql.ast.statement.SQLSelectItem;
+import com.alibaba.druid.sql.ast.statement.SQLSelectOrderByItem;
+import com.alibaba.druid.sql.ast.statement.SQLSelectQuery;
+import com.alibaba.druid.sql.ast.statement.SQLSelectStatement;
+import com.alibaba.druid.sql.ast.statement.SQLTableSource;
+import com.alibaba.druid.sql.ast.statement.SQLUpdateSetItem;
+import com.alibaba.druid.sql.ast.statement.SQLUpdateStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.expr.MySqlSelectGroupByExpr;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock;
 import com.alibaba.druid.sql.dialect.mysql.parser.MySqlStatementParser;
-import com.alibaba.druid.sql.ast.statement.*;
-import com.alibaba.druid.sql.ast.expr.*;
-import com.alibaba.druid.sql.ast.*;
+import com.mongodb.BasicDBList;
+import com.mongodb.BasicDBObject;
+import com.mongodb.DB;
+import com.mongodb.DBCollection;
+import com.mongodb.DBCursor;
+import com.mongodb.DBObject;
 /**  
  * 功能详细描述
  * @author sohudo[http://blog.csdn.net/wind520]
diff --git a/src/main/java/io/mycat/backend/jdbc/mongodb/MongoStatement.java b/src/main/java/io/mycat/backend/jdbc/mongodb/MongoStatement.java
index 16f26c015..48c880159 100644
--- a/src/main/java/io/mycat/backend/jdbc/mongodb/MongoStatement.java
+++ b/src/main/java/io/mycat/backend/jdbc/mongodb/MongoStatement.java
@@ -1,7 +1,5 @@
 package io.mycat.backend.jdbc.mongodb;
 
-import com.mongodb.DBCursor;
-
 import java.sql.Connection;
 import java.sql.ResultSet;
 import java.sql.SQLException;
diff --git a/src/main/java/io/mycat/backend/jdbc/sequoiadb/SequoiaConnection.java b/src/main/java/io/mycat/backend/jdbc/sequoiadb/SequoiaConnection.java
index 17d783fec..368b4b261 100644
--- a/src/main/java/io/mycat/backend/jdbc/sequoiadb/SequoiaConnection.java
+++ b/src/main/java/io/mycat/backend/jdbc/sequoiadb/SequoiaConnection.java
@@ -20,8 +20,8 @@
 import java.util.Properties;
 import java.util.concurrent.Executor;
 
-import com.sequoiadb.base.Sequoiadb;
 import com.sequoiadb.base.CollectionSpace;
+import com.sequoiadb.base.Sequoiadb;
 import com.sequoiadb.exception.BaseException;
 /**  
  * 功能详细描述
diff --git a/src/main/java/io/mycat/backend/jdbc/sequoiadb/SequoiaData.java b/src/main/java/io/mycat/backend/jdbc/sequoiadb/SequoiaData.java
index 9a4ef2715..357620069 100644
--- a/src/main/java/io/mycat/backend/jdbc/sequoiadb/SequoiaData.java
+++ b/src/main/java/io/mycat/backend/jdbc/sequoiadb/SequoiaData.java
@@ -7,8 +7,8 @@
 import java.util.HashMap;
 
 import org.bson.BSONObject;
-import org.bson.BasicBSONObject;
 import org.bson.types.BasicBSONList;
+
 import com.sequoiadb.base.DBCursor;
 
 public class SequoiaData {
diff --git a/src/main/java/io/mycat/backend/jdbc/sequoiadb/SequoiaResultSet.java b/src/main/java/io/mycat/backend/jdbc/sequoiadb/SequoiaResultSet.java
index 83b6f7c9e..6501e52a5 100644
--- a/src/main/java/io/mycat/backend/jdbc/sequoiadb/SequoiaResultSet.java
+++ b/src/main/java/io/mycat/backend/jdbc/sequoiadb/SequoiaResultSet.java
@@ -1,10 +1,6 @@
 package io.mycat.backend.jdbc.sequoiadb;
 
 
-import com.sequoiadb.base.DBCursor;
-import org.bson.BSONObject;
-import org.bson.types.BasicBSONList;
-
 import java.io.InputStream;
 import java.io.Reader;
 import java.math.BigDecimal;
@@ -31,6 +27,11 @@
 //import java.util.HashMap;
 import java.util.Map;
 import java.util.Set;
+
+import org.bson.BSONObject;
+import org.bson.types.BasicBSONList;
+
+import com.sequoiadb.base.DBCursor;
 /**  
  * 功能详细描述
  * @author sohudo[http://blog.csdn.net/wind520]
diff --git a/src/main/java/io/mycat/backend/jdbc/sequoiadb/SequoiaSQLParser.java b/src/main/java/io/mycat/backend/jdbc/sequoiadb/SequoiaSQLParser.java
index d4caff0a3..c430ac572 100644
--- a/src/main/java/io/mycat/backend/jdbc/sequoiadb/SequoiaSQLParser.java
+++ b/src/main/java/io/mycat/backend/jdbc/sequoiadb/SequoiaSQLParser.java
@@ -5,26 +5,43 @@
 import java.sql.Types;
 import java.util.List;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-import com.sequoiadb.base.CollectionSpace;
-import com.sequoiadb.base.DBCollection;
-import com.sequoiadb.base.DBCursor;
-
 import org.bson.BSONObject;
 import org.bson.BasicBSONObject;
 import org.bson.types.BasicBSONList;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import com.alibaba.druid.sql.ast.SQLExpr;
+import com.alibaba.druid.sql.ast.SQLOrderBy;
 import com.alibaba.druid.sql.ast.SQLOrderingSpecification;
 import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.ast.expr.SQLAggregateExpr;
+import com.alibaba.druid.sql.ast.expr.SQLAllColumnExpr;
+import com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr;
+import com.alibaba.druid.sql.ast.expr.SQLBooleanExpr;
+import com.alibaba.druid.sql.ast.expr.SQLCharExpr;
+import com.alibaba.druid.sql.ast.expr.SQLIntegerExpr;
+import com.alibaba.druid.sql.ast.expr.SQLNullExpr;
+import com.alibaba.druid.sql.ast.expr.SQLNumberExpr;
+import com.alibaba.druid.sql.ast.expr.SQLVariantRefExpr;
+import com.alibaba.druid.sql.ast.statement.SQLCreateTableStatement;
+import com.alibaba.druid.sql.ast.statement.SQLDeleteStatement;
+import com.alibaba.druid.sql.ast.statement.SQLDropTableStatement;
+import com.alibaba.druid.sql.ast.statement.SQLInsertStatement;
+import com.alibaba.druid.sql.ast.statement.SQLSelectGroupByClause;
+import com.alibaba.druid.sql.ast.statement.SQLSelectItem;
+import com.alibaba.druid.sql.ast.statement.SQLSelectOrderByItem;
+import com.alibaba.druid.sql.ast.statement.SQLSelectQuery;
+import com.alibaba.druid.sql.ast.statement.SQLSelectStatement;
+import com.alibaba.druid.sql.ast.statement.SQLTableSource;
+import com.alibaba.druid.sql.ast.statement.SQLUpdateSetItem;
+import com.alibaba.druid.sql.ast.statement.SQLUpdateStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.expr.MySqlSelectGroupByExpr;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock;
 import com.alibaba.druid.sql.dialect.mysql.parser.MySqlStatementParser;
-import com.alibaba.druid.sql.ast.statement.*;
-import com.alibaba.druid.sql.ast.expr.*;
-import com.alibaba.druid.sql.ast.*;
+import com.sequoiadb.base.CollectionSpace;
+import com.sequoiadb.base.DBCollection;
+import com.sequoiadb.base.DBCursor;
 /**  
  * 功能详细描述
  * @author sohudo[http://blog.csdn.net/wind520]
diff --git a/src/main/java/io/mycat/cache/impl/LevelDBCachePooFactory.java b/src/main/java/io/mycat/cache/impl/LevelDBCachePooFactory.java
index 0ebedc0ec..9e71a761d 100644
--- a/src/main/java/io/mycat/cache/impl/LevelDBCachePooFactory.java
+++ b/src/main/java/io/mycat/cache/impl/LevelDBCachePooFactory.java
@@ -1,13 +1,12 @@
 package io.mycat.cache.impl;
 
 
+import static org.iq80.leveldb.impl.Iq80DBFactory.factory;
 import io.mycat.cache.CachePool;
 import io.mycat.cache.CachePoolFactory;
 
 import java.io.File;
 
-import static org.iq80.leveldb.impl.Iq80DBFactory.factory;
-
 import org.iq80.leveldb.DB;
 import org.iq80.leveldb.Options;
 
diff --git a/src/main/java/io/mycat/net/Connection.java b/src/main/java/io/mycat/net/Connection.java
index 8e15972f4..3a29c9ff1 100644
--- a/src/main/java/io/mycat/net/Connection.java
+++ b/src/main/java/io/mycat/net/Connection.java
@@ -1,5 +1,7 @@
 package io.mycat.net;
 
+import io.mycat.util.TimeUtil;
+
 import java.io.IOException;
 import java.nio.ByteBuffer;
 import java.nio.channels.SelectionKey;
@@ -10,7 +12,6 @@
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.locks.ReentrantLock;
 
-import io.mycat.util.TimeUtil;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
diff --git a/src/main/java/io/mycat/net/NetSystem.java b/src/main/java/io/mycat/net/NetSystem.java
index 9075ba490..8b5d2b49b 100644
--- a/src/main/java/io/mycat/net/NetSystem.java
+++ b/src/main/java/io/mycat/net/NetSystem.java
@@ -1,6 +1,9 @@
 package io.mycat.net;
 
 import io.mycat.backend.BackendConnection;
+import io.mycat.server.MycatServer;
+import io.mycat.server.SystemConfig;
+import io.mycat.util.TimeUtil;
 
 import java.io.IOException;
 import java.net.StandardSocketOptions;
@@ -10,10 +13,6 @@
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
 
-import io.mycat.server.MycatServer;
-import io.mycat.server.SystemConfig;
-
-import io.mycat.util.TimeUtil;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
diff --git a/src/main/java/io/mycat/net/ThreadLocalBufferPool.java b/src/main/java/io/mycat/net/ThreadLocalBufferPool.java
index f57960aae..bef438a86 100644
--- a/src/main/java/io/mycat/net/ThreadLocalBufferPool.java
+++ b/src/main/java/io/mycat/net/ThreadLocalBufferPool.java
@@ -1,6 +1,5 @@
 package io.mycat.net;
 
-import io.mycat.net.BufferQueue;
 
 public class ThreadLocalBufferPool extends ThreadLocal<BufferQueue> {
 	private final int size;
diff --git a/src/main/java/io/mycat/route/RouteResultset.java b/src/main/java/io/mycat/route/RouteResultset.java
index 70699cae9..40dba3cda 100644
--- a/src/main/java/io/mycat/route/RouteResultset.java
+++ b/src/main/java/io/mycat/route/RouteResultset.java
@@ -23,9 +23,7 @@
  */
 package io.mycat.route;
 
-import io.mycat.MycatConfig;
 import io.mycat.route.util.PageSQLUtil;
-import io.mycat.server.MycatServer;
 import io.mycat.server.config.SchemaConfig;
 import io.mycat.sqlengine.mpp.HavingCols;
 import io.mycat.util.FormatUtil;
diff --git a/src/main/java/io/mycat/route/factory/RouteStrategyFactory.java b/src/main/java/io/mycat/route/factory/RouteStrategyFactory.java
index ccee69425..8f2ad5430 100644
--- a/src/main/java/io/mycat/route/factory/RouteStrategyFactory.java
+++ b/src/main/java/io/mycat/route/factory/RouteStrategyFactory.java
@@ -4,8 +4,6 @@
 import io.mycat.route.impl.DruidMycatRouteStrategy;
 import io.mycat.server.MycatServer;
 
-import java.util.HashMap;
-import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentMap;
 
diff --git a/src/main/java/io/mycat/route/function/PartitionByMod.java b/src/main/java/io/mycat/route/function/PartitionByMod.java
index 40fc6e7d6..377db18ea 100644
--- a/src/main/java/io/mycat/route/function/PartitionByMod.java
+++ b/src/main/java/io/mycat/route/function/PartitionByMod.java
@@ -25,14 +25,11 @@
 
 import io.mycat.server.config.RuleAlgorithm;
 
-import java.io.ByteArrayInputStream;
-import java.io.ByteArrayOutputStream;
 import java.math.BigInteger;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
-import java.util.Properties;
 
 /**
  * number column partion by Mod operator
diff --git a/src/main/java/io/mycat/route/function/PartitionByMurmurHash.java b/src/main/java/io/mycat/route/function/PartitionByMurmurHash.java
index 01e3b751d..c956946e5 100644
--- a/src/main/java/io/mycat/route/function/PartitionByMurmurHash.java
+++ b/src/main/java/io/mycat/route/function/PartitionByMurmurHash.java
@@ -29,14 +29,8 @@
 import java.io.BufferedReader;
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.FileNotFoundException;
-import java.io.FileOutputStream;
 import java.io.IOException;
-import java.io.InputStream;
 import java.io.InputStreamReader;
-import java.io.OutputStream;
 import java.nio.charset.Charset;
 import java.util.ArrayList;
 import java.util.HashMap;
diff --git a/src/main/java/io/mycat/route/function/PartitionByRangeDateHash.java b/src/main/java/io/mycat/route/function/PartitionByRangeDateHash.java
index aa7e6d723..fd7c3822e 100644
--- a/src/main/java/io/mycat/route/function/PartitionByRangeDateHash.java
+++ b/src/main/java/io/mycat/route/function/PartitionByRangeDateHash.java
@@ -1,14 +1,14 @@
 package io.mycat.route.function;
 
-import com.google.common.hash.Hashing;
-
-import org.apache.log4j.Logger;
-
 import io.mycat.server.config.RuleAlgorithm;
 
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
 
+import org.apache.log4j.Logger;
+
+import com.google.common.hash.Hashing;
+
 /**
  * 先根据日期分组，再根据时间hash使得短期内数据分布的更均匀
  * 优点可以避免扩容时的数据迁移，又可以一定程度上避免范围分片的热点问题
diff --git a/src/main/java/io/mycat/route/parser/druid/DruidParser.java b/src/main/java/io/mycat/route/parser/druid/DruidParser.java
index 0b685326e..22454c17e 100644
--- a/src/main/java/io/mycat/route/parser/druid/DruidParser.java
+++ b/src/main/java/io/mycat/route/parser/druid/DruidParser.java
@@ -6,7 +6,6 @@
 
 import java.sql.SQLNonTransientException;
 
-import com.alibaba.druid.sql.visitor.SchemaStatVisitor;
 import com.alibaba.druid.sql.ast.SQLStatement;
 
 /**
diff --git a/src/main/java/io/mycat/route/parser/druid/DruidParserFactory.java b/src/main/java/io/mycat/route/parser/druid/DruidParserFactory.java
index 92d79261c..35016cc34 100644
--- a/src/main/java/io/mycat/route/parser/druid/DruidParserFactory.java
+++ b/src/main/java/io/mycat/route/parser/druid/DruidParserFactory.java
@@ -1,15 +1,33 @@
 package io.mycat.route.parser.druid;
 
-import com.alibaba.druid.sql.ast.SQLStatement;
-import com.alibaba.druid.sql.ast.statement.SQLSelectStatement;
-import com.alibaba.druid.sql.dialect.mysql.ast.statement.*;
-import com.alibaba.druid.sql.visitor.SchemaStatVisitor;
-
-import io.mycat.route.parser.druid.impl.*;
+import io.mycat.route.parser.druid.impl.DefaultDruidParser;
+import io.mycat.route.parser.druid.impl.DruidAlterTableParser;
+import io.mycat.route.parser.druid.impl.DruidCreateTableParser;
+import io.mycat.route.parser.druid.impl.DruidDeleteParser;
+import io.mycat.route.parser.druid.impl.DruidInsertParser;
+import io.mycat.route.parser.druid.impl.DruidSelectDb2Parser;
+import io.mycat.route.parser.druid.impl.DruidSelectOracleParser;
+import io.mycat.route.parser.druid.impl.DruidSelectParser;
+import io.mycat.route.parser.druid.impl.DruidSelectPostgresqlParser;
+import io.mycat.route.parser.druid.impl.DruidSelectSqlServerParser;
+import io.mycat.route.parser.druid.impl.DruidUpdateParser;
 import io.mycat.server.config.SchemaConfig;
 import io.mycat.server.config.TableConfig;
 
-import java.util.*;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.ast.statement.SQLSelectStatement;
+import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlAlterTableStatement;
+import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlCreateTableStatement;
+import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlDeleteStatement;
+import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlInsertStatement;
+import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlUpdateStatement;
+import com.alibaba.druid.sql.visitor.SchemaStatVisitor;
 
 /**
  * DruidParser的工厂类
diff --git a/src/main/java/io/mycat/route/parser/druid/DruidShardingParseInfo.java b/src/main/java/io/mycat/route/parser/druid/DruidShardingParseInfo.java
index 6a34c0752..f13ba2850 100644
--- a/src/main/java/io/mycat/route/parser/druid/DruidShardingParseInfo.java
+++ b/src/main/java/io/mycat/route/parser/druid/DruidShardingParseInfo.java
@@ -1,15 +1,9 @@
 package io.mycat.route.parser.druid;
 
-import io.mycat.sqlengine.mpp.ColumnRoutePair;
-import io.mycat.sqlengine.mpp.RangeValue;
-
 import java.util.ArrayList;
-import java.util.HashSet;
 import java.util.LinkedHashMap;
-import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Map;
-import java.util.Set;
 
 /**
  * druid parser result
diff --git a/src/main/java/io/mycat/route/parser/druid/MycatLexer.java b/src/main/java/io/mycat/route/parser/druid/MycatLexer.java
index 21a019327..691e2d225 100644
--- a/src/main/java/io/mycat/route/parser/druid/MycatLexer.java
+++ b/src/main/java/io/mycat/route/parser/druid/MycatLexer.java
@@ -1,12 +1,12 @@
 package io.mycat.route.parser.druid;
 
+import java.util.HashMap;
+import java.util.Map;
+
 import com.alibaba.druid.sql.dialect.mysql.parser.MySqlLexer;
 import com.alibaba.druid.sql.parser.Keywords;
 import com.alibaba.druid.sql.parser.Token;
 
-import java.util.HashMap;
-import java.util.Map;
-
 /**
  * Created by magicdoom on 2015/3/13.
  */
diff --git a/src/main/java/io/mycat/route/parser/druid/MycatStatementParser.java b/src/main/java/io/mycat/route/parser/druid/MycatStatementParser.java
index cacde44fa..0965633bf 100644
--- a/src/main/java/io/mycat/route/parser/druid/MycatStatementParser.java
+++ b/src/main/java/io/mycat/route/parser/druid/MycatStatementParser.java
@@ -6,7 +6,10 @@
 import com.alibaba.druid.sql.ast.statement.SQLSelectStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlLoadDataInFileStatement;
 import com.alibaba.druid.sql.dialect.mysql.parser.MySqlStatementParser;
-import com.alibaba.druid.sql.parser.*;
+import com.alibaba.druid.sql.parser.Lexer;
+import com.alibaba.druid.sql.parser.ParserException;
+import com.alibaba.druid.sql.parser.SQLExprParser;
+import com.alibaba.druid.sql.parser.Token;
 import com.alibaba.druid.util.JdbcConstants;
 
 /**
diff --git a/src/main/java/io/mycat/route/parser/druid/impl/DruidSelectDb2Parser.java b/src/main/java/io/mycat/route/parser/druid/impl/DruidSelectDb2Parser.java
index 75f87c8a2..3bcad991c 100644
--- a/src/main/java/io/mycat/route/parser/druid/impl/DruidSelectDb2Parser.java
+++ b/src/main/java/io/mycat/route/parser/druid/impl/DruidSelectDb2Parser.java
@@ -1,22 +1,27 @@
 package io.mycat.route.parser.druid.impl;
 
-import com.alibaba.druid.sql.ast.SQLExpr;
-import com.alibaba.druid.sql.ast.SQLOrderBy;
-import com.alibaba.druid.sql.ast.SQLStatement;
-import com.alibaba.druid.sql.ast.expr.*;
-import com.alibaba.druid.sql.ast.statement.*;
-import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleSelect;
-import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleSelectQueryBlock;
-import com.alibaba.druid.util.JdbcConstants;
-
 import io.mycat.route.RouteResultset;
-import io.mycat.route.util.PageSQLUtil;
 import io.mycat.server.config.SchemaConfig;
 
 import java.util.List;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
+import com.alibaba.druid.sql.ast.SQLExpr;
+import com.alibaba.druid.sql.ast.SQLOrderBy;
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.ast.expr.SQLAggregateExpr;
+import com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr;
+import com.alibaba.druid.sql.ast.expr.SQLBinaryOperator;
+import com.alibaba.druid.sql.ast.expr.SQLIntegerExpr;
+import com.alibaba.druid.sql.ast.statement.SQLSelectItem;
+import com.alibaba.druid.sql.ast.statement.SQLSelectQuery;
+import com.alibaba.druid.sql.ast.statement.SQLSubqueryTableSource;
+import com.alibaba.druid.sql.ast.statement.SQLTableSource;
+import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleSelect;
+import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleSelectQueryBlock;
+import com.alibaba.druid.util.JdbcConstants;
+
 
 /**
  * 由于druid的db2解析部分不够完整，且使用oracle的解析基本能满足需求
diff --git a/src/main/java/io/mycat/route/parser/druid/impl/DruidSelectOracleParser.java b/src/main/java/io/mycat/route/parser/druid/impl/DruidSelectOracleParser.java
index cd75e750f..78f409cf2 100644
--- a/src/main/java/io/mycat/route/parser/druid/impl/DruidSelectOracleParser.java
+++ b/src/main/java/io/mycat/route/parser/druid/impl/DruidSelectOracleParser.java
@@ -1,8 +1,24 @@
 package io.mycat.route.parser.druid.impl;
 
-import com.alibaba.druid.sql.ast.*;
-import com.alibaba.druid.sql.ast.expr.*;
-import com.alibaba.druid.sql.ast.statement.*;
+import io.mycat.route.RouteResultset;
+import io.mycat.server.config.SchemaConfig;
+
+import java.util.List;
+import java.util.Map;
+
+import com.alibaba.druid.sql.ast.SQLExpr;
+import com.alibaba.druid.sql.ast.SQLOrderBy;
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.ast.expr.SQLAggregateExpr;
+import com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr;
+import com.alibaba.druid.sql.ast.expr.SQLBinaryOperator;
+import com.alibaba.druid.sql.ast.expr.SQLIntegerExpr;
+import com.alibaba.druid.sql.ast.statement.SQLSelectItem;
+import com.alibaba.druid.sql.ast.statement.SQLSelectOrderByItem;
+import com.alibaba.druid.sql.ast.statement.SQLSelectQuery;
+import com.alibaba.druid.sql.ast.statement.SQLSelectStatement;
+import com.alibaba.druid.sql.ast.statement.SQLSubqueryTableSource;
+import com.alibaba.druid.sql.ast.statement.SQLTableSource;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock.Limit;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleSelect;
@@ -10,13 +26,6 @@
 import com.alibaba.druid.sql.dialect.oracle.parser.OracleStatementParser;
 import com.alibaba.druid.util.JdbcConstants;
 
-import io.mycat.route.RouteResultset;
-import io.mycat.route.util.PageSQLUtil;
-import io.mycat.server.config.SchemaConfig;
-
-import java.util.List;
-import java.util.Map;
-
 public class DruidSelectOracleParser extends DruidSelectParser {
 
     @Override
diff --git a/src/main/java/io/mycat/route/parser/druid/impl/DruidSelectParser.java b/src/main/java/io/mycat/route/parser/druid/impl/DruidSelectParser.java
index fd262fe9c..d9fc04e31 100644
--- a/src/main/java/io/mycat/route/parser/druid/impl/DruidSelectParser.java
+++ b/src/main/java/io/mycat/route/parser/druid/impl/DruidSelectParser.java
@@ -1,5 +1,21 @@
 package io.mycat.route.parser.druid.impl;
 
+import io.mycat.cache.LayerCachePool;
+import io.mycat.route.RouteResultset;
+import io.mycat.route.RouteResultsetNode;
+import io.mycat.route.parser.druid.RouteCalculateUnit;
+import io.mycat.route.util.RouterUtil;
+import io.mycat.server.ErrorCode;
+import io.mycat.server.MycatServer;
+import io.mycat.server.config.SchemaConfig;
+import io.mycat.server.config.TableConfig;
+import io.mycat.sqlengine.mpp.ColumnRoutePair;
+import io.mycat.sqlengine.mpp.HavingCols;
+import io.mycat.sqlengine.mpp.MergeCol;
+import io.mycat.sqlengine.mpp.OrderCol;
+import io.mycat.util.ObjectUtil;
+import io.mycat.util.StringUtil;
+
 import java.sql.SQLNonTransientException;
 import java.util.HashMap;
 import java.util.Iterator;
@@ -10,13 +26,20 @@
 import java.util.SortedSet;
 import java.util.TreeSet;
 
-import com.alibaba.druid.sql.ast.expr.*;
-
-
 import com.alibaba.druid.sql.ast.SQLExpr;
 import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.SQLOrderingSpecification;
 import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.ast.expr.SQLAggregateExpr;
+import com.alibaba.druid.sql.ast.expr.SQLAllColumnExpr;
+import com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr;
+import com.alibaba.druid.sql.ast.expr.SQLBinaryOperator;
+import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
+import com.alibaba.druid.sql.ast.expr.SQLIntegerExpr;
+import com.alibaba.druid.sql.ast.expr.SQLMethodInvokeExpr;
+import com.alibaba.druid.sql.ast.expr.SQLNumericLiteralExpr;
+import com.alibaba.druid.sql.ast.expr.SQLPropertyExpr;
+import com.alibaba.druid.sql.ast.expr.SQLTextLiteralExpr;
 import com.alibaba.druid.sql.ast.statement.SQLSelectGroupByClause;
 import com.alibaba.druid.sql.ast.statement.SQLSelectItem;
 import com.alibaba.druid.sql.ast.statement.SQLSelectOrderByItem;
@@ -29,21 +52,6 @@
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlUnionQuery;
 import com.alibaba.druid.util.JdbcConstants;
 import com.alibaba.druid.wall.spi.WallVisitorUtils;
-import io.mycat.cache.LayerCachePool;
-import io.mycat.route.RouteResultset;
-import io.mycat.route.RouteResultsetNode;
-import io.mycat.route.parser.druid.RouteCalculateUnit;
-import io.mycat.route.util.RouterUtil;
-import io.mycat.server.ErrorCode;
-import io.mycat.server.MycatServer;
-import io.mycat.server.config.SchemaConfig;
-import io.mycat.server.config.TableConfig;
-import io.mycat.sqlengine.mpp.ColumnRoutePair;
-import io.mycat.sqlengine.mpp.HavingCols;
-import io.mycat.sqlengine.mpp.MergeCol;
-import io.mycat.sqlengine.mpp.OrderCol;
-import io.mycat.util.ObjectUtil;
-import io.mycat.util.StringUtil;
 
 public class DruidSelectParser extends DefaultDruidParser {
 
diff --git a/src/main/java/io/mycat/route/parser/druid/impl/DruidSelectSqlServerParser.java b/src/main/java/io/mycat/route/parser/druid/impl/DruidSelectSqlServerParser.java
index 9fa5783f7..a15ff0c55 100644
--- a/src/main/java/io/mycat/route/parser/druid/impl/DruidSelectSqlServerParser.java
+++ b/src/main/java/io/mycat/route/parser/druid/impl/DruidSelectSqlServerParser.java
@@ -1,5 +1,11 @@
 package io.mycat.route.parser.druid.impl;
 
+import io.mycat.route.RouteResultset;
+import io.mycat.server.config.SchemaConfig;
+
+import java.util.List;
+import java.util.Map;
+
 import com.alibaba.druid.sql.ast.SQLExpr;
 import com.alibaba.druid.sql.ast.SQLOrderBy;
 import com.alibaba.druid.sql.ast.SQLStatement;
@@ -7,7 +13,12 @@
 import com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr;
 import com.alibaba.druid.sql.ast.expr.SQLBinaryOperator;
 import com.alibaba.druid.sql.ast.expr.SQLIntegerExpr;
-import com.alibaba.druid.sql.ast.statement.*;
+import com.alibaba.druid.sql.ast.statement.SQLSelectItem;
+import com.alibaba.druid.sql.ast.statement.SQLSelectOrderByItem;
+import com.alibaba.druid.sql.ast.statement.SQLSelectQuery;
+import com.alibaba.druid.sql.ast.statement.SQLSelectStatement;
+import com.alibaba.druid.sql.ast.statement.SQLSubqueryTableSource;
+import com.alibaba.druid.sql.ast.statement.SQLTableSource;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock;
 import com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerSelect;
 import com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerSelectQueryBlock;
@@ -15,13 +26,6 @@
 import com.alibaba.druid.sql.dialect.sqlserver.parser.SQLServerStatementParser;
 import com.alibaba.druid.util.JdbcConstants;
 
-import io.mycat.route.RouteResultset;
-import io.mycat.route.util.PageSQLUtil;
-import io.mycat.server.config.SchemaConfig;
-
-import java.util.List;
-import java.util.Map;
-
 public class DruidSelectSqlServerParser extends DruidSelectParser {
 
 
diff --git a/src/main/java/io/mycat/route/util/PageSQLUtil.java b/src/main/java/io/mycat/route/util/PageSQLUtil.java
index da7708859..84f0fc95d 100644
--- a/src/main/java/io/mycat/route/util/PageSQLUtil.java
+++ b/src/main/java/io/mycat/route/util/PageSQLUtil.java
@@ -1,12 +1,26 @@
 package io.mycat.route.util;
 
+import java.util.List;
+
 import com.alibaba.druid.sql.PagerUtils;
 import com.alibaba.druid.sql.SQLUtils;
 import com.alibaba.druid.sql.ast.SQLExpr;
 import com.alibaba.druid.sql.ast.SQLOrderBy;
 import com.alibaba.druid.sql.ast.SQLOver;
-import com.alibaba.druid.sql.ast.expr.*;
-import com.alibaba.druid.sql.ast.statement.*;
+import com.alibaba.druid.sql.ast.expr.SQLAggregateExpr;
+import com.alibaba.druid.sql.ast.expr.SQLAllColumnExpr;
+import com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr;
+import com.alibaba.druid.sql.ast.expr.SQLBinaryOperator;
+import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
+import com.alibaba.druid.sql.ast.expr.SQLNumberExpr;
+import com.alibaba.druid.sql.ast.expr.SQLPropertyExpr;
+import com.alibaba.druid.sql.ast.statement.SQLSelect;
+import com.alibaba.druid.sql.ast.statement.SQLSelectItem;
+import com.alibaba.druid.sql.ast.statement.SQLSelectQuery;
+import com.alibaba.druid.sql.ast.statement.SQLSelectQueryBlock;
+import com.alibaba.druid.sql.ast.statement.SQLSelectStatement;
+import com.alibaba.druid.sql.ast.statement.SQLSubqueryTableSource;
+import com.alibaba.druid.sql.ast.statement.SQLTableSource;
 import com.alibaba.druid.sql.dialect.db2.ast.stmt.DB2SelectQueryBlock;
 import com.alibaba.druid.sql.dialect.db2.parser.DB2StatementParser;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock;
@@ -18,8 +32,6 @@
 import com.alibaba.druid.sql.dialect.sqlserver.parser.SQLServerStatementParser;
 import com.alibaba.druid.util.JdbcConstants;
 
-import java.util.List;
-
 /**
  * Created by magicdoom on 2015/3/15.
  */
diff --git a/src/main/java/io/mycat/route/util/RouterUtil.java b/src/main/java/io/mycat/route/util/RouterUtil.java
index 49eebf43c..4253b042f 100644
--- a/src/main/java/io/mycat/route/util/RouterUtil.java
+++ b/src/main/java/io/mycat/route/util/RouterUtil.java
@@ -1,5 +1,6 @@
 package io.mycat.route.util;
 
+import io.mycat.backend.PhysicalDBNode;
 import io.mycat.cache.LayerCachePool;
 import io.mycat.route.RouteResultset;
 import io.mycat.route.RouteResultsetNode;
@@ -18,7 +19,6 @@
 import io.mycat.sqlengine.mpp.ColumnRoutePair;
 import io.mycat.sqlengine.mpp.LoadData;
 import io.mycat.util.StringUtil;
-import io.mycat.backend.PhysicalDBNode;
 
 import java.sql.SQLNonTransientException;
 import java.sql.SQLSyntaxErrorException;
diff --git a/src/main/java/io/mycat/route/util/VelocityUtil.java b/src/main/java/io/mycat/route/util/VelocityUtil.java
index 3bbc7bade..fc2a67ba9 100644
--- a/src/main/java/io/mycat/route/util/VelocityUtil.java
+++ b/src/main/java/io/mycat/route/util/VelocityUtil.java
@@ -3,6 +3,7 @@
 import java.io.IOException;
 import java.io.StringWriter;
 import java.io.Writer;
+
 import org.apache.log4j.Logger;
 import org.apache.velocity.VelocityContext;
 import org.apache.velocity.app.Velocity;
diff --git a/src/main/java/io/mycat/server/classloader/JarLoader.java b/src/main/java/io/mycat/server/classloader/JarLoader.java
index 36a559fd6..9ad9e1216 100644
--- a/src/main/java/io/mycat/server/classloader/JarLoader.java
+++ b/src/main/java/io/mycat/server/classloader/JarLoader.java
@@ -1,12 +1,18 @@
 package io.mycat.server.classloader;
 
 
-import java.util.jar.*;
-import java.lang.reflect.*;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
 import java.net.URL;
 import java.net.URLClassLoader;
-import java.io.*;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Enumeration;
+import java.util.jar.JarEntry;
+import java.util.jar.JarFile;
+import java.util.jar.Manifest;
 
 public class JarLoader {
 	  /** Unpack a jar file into a directory. */
diff --git a/src/main/java/io/mycat/server/config/XMLSchemaLoader.java b/src/main/java/io/mycat/server/config/XMLSchemaLoader.java
index 33f75714d..e47ba087f 100644
--- a/src/main/java/io/mycat/server/config/XMLSchemaLoader.java
+++ b/src/main/java/io/mycat/server/config/XMLSchemaLoader.java
@@ -29,7 +29,14 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.net.URI;
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
 
 import org.w3c.dom.Element;
 import org.w3c.dom.Node;
diff --git a/src/main/java/io/mycat/server/packet/util/CharsetUtil.java b/src/main/java/io/mycat/server/packet/util/CharsetUtil.java
index 401516d77..cf615b77e 100644
--- a/src/main/java/io/mycat/server/packet/util/CharsetUtil.java
+++ b/src/main/java/io/mycat/server/packet/util/CharsetUtil.java
@@ -23,12 +23,14 @@
  */
 package io.mycat.server.packet.util;
 
+import java.io.FileInputStream;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Properties;
+
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.io.FileInputStream;
-import java.util.*;
-
 /**
  * @author mycat
  */
@@ -38,7 +40,7 @@ public class CharsetUtil {
     private static final Map<Integer,String> INDEX_TO_CHARSET = new HashMap<>();
     private static final Map<String, Integer> CHARSET_TO_INDEX = new HashMap<>();
     static {
-        //���ӳ�������Ĭ��ֵ����ֹ�û�δ�����ļ� index_to_charset.properties
+        //��ӳ������Ĭ��ֵ����ֹ�û�δ�����ļ� index_to_charset.properties
         INDEX_TO_CHARSET.put(1,"big5");
         INDEX_TO_CHARSET.put(8,"latin1");
         INDEX_TO_CHARSET.put(9,"latin2");
diff --git a/src/main/java/io/mycat/server/response/SelectVariables.java b/src/main/java/io/mycat/server/response/SelectVariables.java
index 5348366c1..1fb6dd3be 100644
--- a/src/main/java/io/mycat/server/response/SelectVariables.java
+++ b/src/main/java/io/mycat/server/response/SelectVariables.java
@@ -23,7 +23,6 @@
  */
 package io.mycat.server.response;
 
-import com.google.common.base.Splitter;
 import io.mycat.net.BufferArray;
 import io.mycat.net.NetSystem;
 import io.mycat.server.Fields;
@@ -33,14 +32,15 @@
 import io.mycat.server.packet.ResultSetHeaderPacket;
 import io.mycat.server.packet.RowDataPacket;
 import io.mycat.server.packet.util.PacketUtil;
-import org.apache.log4j.Logger;
 
-
-import java.nio.ByteBuffer;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
+import org.apache.log4j.Logger;
+
+import com.google.common.base.Splitter;
+
 /**
  * @author mycat
  */
diff --git a/src/main/java/io/mycat/server/sqlhandler/SelectHandler.java b/src/main/java/io/mycat/server/sqlhandler/SelectHandler.java
index ca92f53bc..0cfc7f36e 100644
--- a/src/main/java/io/mycat/server/sqlhandler/SelectHandler.java
+++ b/src/main/java/io/mycat/server/sqlhandler/SelectHandler.java
@@ -26,7 +26,15 @@
 import io.mycat.server.MySQLFrontConnection;
 import io.mycat.server.parser.ServerParse;
 import io.mycat.server.parser.ServerParseSelect;
-import io.mycat.server.response.*;
+import io.mycat.server.response.SelectDatabase;
+import io.mycat.server.response.SelectIdentity;
+import io.mycat.server.response.SelectLastInsertId;
+import io.mycat.server.response.SelectUser;
+import io.mycat.server.response.SelectVariables;
+import io.mycat.server.response.SelectVersion;
+import io.mycat.server.response.SelectVersionComment;
+import io.mycat.server.response.SessionIncrement;
+import io.mycat.server.response.SessionIsolation;
 import io.mycat.util.ParseUtil;
 
 /**
diff --git a/src/main/java/io/mycat/sqlengine/sharejoin/JoinParser.java b/src/main/java/io/mycat/sqlengine/sharejoin/JoinParser.java
index 885cbe6de..116e177cd 100644
--- a/src/main/java/io/mycat/sqlengine/sharejoin/JoinParser.java
+++ b/src/main/java/io/mycat/sqlengine/sharejoin/JoinParser.java
@@ -1,10 +1,10 @@
 package io.mycat.sqlengine.sharejoin;
 
 
-import java.util.LinkedHashMap;
 import java.util.List;
 
 import org.apache.log4j.Logger;
+
 import com.alibaba.druid.sql.ast.SQLExpr;
 import com.alibaba.druid.sql.ast.SQLOrderBy;
 import com.alibaba.druid.sql.ast.SQLOrderingSpecification;
diff --git a/src/main/java/io/mycat/sqlengine/sharejoin/TableFilter.java b/src/main/java/io/mycat/sqlengine/sharejoin/TableFilter.java
index d5d660604..074147abe 100644
--- a/src/main/java/io/mycat/sqlengine/sharejoin/TableFilter.java
+++ b/src/main/java/io/mycat/sqlengine/sharejoin/TableFilter.java
@@ -4,6 +4,7 @@
 import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.Map.Entry;
+
 import org.apache.log4j.Logger;
 /**  
  * 功能详细描述:分片join,单独的语句
diff --git a/src/main/java/io/mycat/sqlengine/tmp/RowDataSorter.java b/src/main/java/io/mycat/sqlengine/tmp/RowDataSorter.java
index da7c36367..74266c64f 100644
--- a/src/main/java/io/mycat/sqlengine/tmp/RowDataSorter.java
+++ b/src/main/java/io/mycat/sqlengine/tmp/RowDataSorter.java
@@ -4,7 +4,8 @@
 import io.mycat.sqlengine.mpp.OrderCol;
 import io.mycat.sqlengine.mpp.RowDataPacketSorter;
 
-import java.util.*;
+import java.util.Collection;
+import java.util.List;
 
 /**
  * 
diff --git a/src/main/java/io/mycat/util/ByteBufferUtil.java b/src/main/java/io/mycat/util/ByteBufferUtil.java
index f73587027..6dd09e581 100644
--- a/src/main/java/io/mycat/util/ByteBufferUtil.java
+++ b/src/main/java/io/mycat/util/ByteBufferUtil.java
@@ -23,7 +23,10 @@
  * afterward, and ensure the tests still pass.
  */
 
-import java.io.*;
+import java.io.DataInput;
+import java.io.DataOutput;
+import java.io.IOException;
+import java.io.InputStream;
 import java.net.InetAddress;
 import java.nio.ByteBuffer;
 import java.nio.charset.CharacterCodingException;
diff --git a/src/main/java/io/mycat/util/FastByteOperations.java b/src/main/java/io/mycat/util/FastByteOperations.java
index fe2615c83..a469ecea9 100644
--- a/src/main/java/io/mycat/util/FastByteOperations.java
+++ b/src/main/java/io/mycat/util/FastByteOperations.java
@@ -24,11 +24,12 @@
 import java.security.AccessController;
 import java.security.PrivilegedAction;
 
-import com.google.common.primitives.*;
-
-
 import sun.misc.Unsafe;
 
+import com.google.common.primitives.Longs;
+import com.google.common.primitives.UnsignedBytes;
+import com.google.common.primitives.UnsignedLongs;
+
 /**
  * Utility code to do optimized byte-array comparison.
  * This is borrowed and slightly modified from Guava's {@link UnsignedBytes}
diff --git a/src/main/java/io/mycat/util/StringUtil.java b/src/main/java/io/mycat/util/StringUtil.java
index 01a49a7c2..9a7ccdb14 100644
--- a/src/main/java/io/mycat/util/StringUtil.java
+++ b/src/main/java/io/mycat/util/StringUtil.java
@@ -23,15 +23,15 @@
  */
 package io.mycat.util;
 
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
 import io.mycat.sqlengine.mpp.LoadData;
 
 import java.io.ByteArrayOutputStream;
 import java.io.UnsupportedEncodingException;
 import java.util.Random;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
 /**
  * @author mycat
  */
diff --git a/src/test/java/io/mycat/ConfigInitializerTest.java b/src/test/java/io/mycat/ConfigInitializerTest.java
index f0b71e814..86c52f799 100644
--- a/src/test/java/io/mycat/ConfigInitializerTest.java
+++ b/src/test/java/io/mycat/ConfigInitializerTest.java
@@ -23,8 +23,6 @@
  */
 package io.mycat;
 
-import io.mycat.ConfigInitializer;
-
 import org.junit.Test;
 
 /**
diff --git a/src/test/java/io/mycat/cache/DefaultLayedCachePoolTest.java b/src/test/java/io/mycat/cache/DefaultLayedCachePoolTest.java
index 2dedcc4ee..1551c090b 100644
--- a/src/test/java/io/mycat/cache/DefaultLayedCachePoolTest.java
+++ b/src/test/java/io/mycat/cache/DefaultLayedCachePoolTest.java
@@ -23,8 +23,6 @@
  */
 package io.mycat.cache;
 
-import io.mycat.cache.CacheStatic;
-import io.mycat.cache.DefaultLayedCachePool;
 import io.mycat.cache.impl.EnchachePooFactory;
 import junit.framework.Assert;
 
diff --git a/src/test/java/io/mycat/cache/EnCachePoolTest.java b/src/test/java/io/mycat/cache/EnCachePoolTest.java
index 986b61b6c..b52ce5f70 100644
--- a/src/test/java/io/mycat/cache/EnCachePoolTest.java
+++ b/src/test/java/io/mycat/cache/EnCachePoolTest.java
@@ -23,7 +23,6 @@
  */
 package io.mycat.cache;
 
-import io.mycat.cache.CacheStatic;
 import io.mycat.cache.impl.EnchachePool;
 import junit.framework.Assert;
 import net.sf.ehcache.Cache;
diff --git a/src/test/java/io/mycat/cache/TestCachePoolPerformance.java b/src/test/java/io/mycat/cache/TestCachePoolPerformance.java
index 742553fff..6d520a009 100644
--- a/src/test/java/io/mycat/cache/TestCachePoolPerformance.java
+++ b/src/test/java/io/mycat/cache/TestCachePoolPerformance.java
@@ -27,8 +27,6 @@
  * test cache performance ,for encache test set  VM param  -server -Xms1100M -Xmx1100M
  * for mapdb set vm param -server -Xms100M -Xmx100M -XX:MaxPermSize=1G
  */
-import io.mycat.cache.CachePool;
-import io.mycat.cache.CacheStatic;
 import io.mycat.cache.impl.EnchachePool;
 import io.mycat.cache.impl.MapDBCachePooFactory;
 import net.sf.ehcache.Cache;
diff --git a/src/test/java/io/mycat/parser/TestEscapeProcess.java b/src/test/java/io/mycat/parser/TestEscapeProcess.java
index 54c29db32..6a6939af7 100644
--- a/src/test/java/io/mycat/parser/TestEscapeProcess.java
+++ b/src/test/java/io/mycat/parser/TestEscapeProcess.java
@@ -17,11 +17,8 @@
 package io.mycat.parser;
 
 import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.assertNull;
 import io.mycat.server.interceptor.impl.DefaultSqlInterceptor;
 
-import java.sql.SQLSyntaxErrorException;
-
 import org.junit.Test;
 
 public class TestEscapeProcess {
diff --git a/src/test/java/io/mycat/parser/druid/MycatSchemaStatVisitorTest.java b/src/test/java/io/mycat/parser/druid/MycatSchemaStatVisitorTest.java
index 19b6c096c..65c642310 100644
--- a/src/test/java/io/mycat/parser/druid/MycatSchemaStatVisitorTest.java
+++ b/src/test/java/io/mycat/parser/druid/MycatSchemaStatVisitorTest.java
@@ -1,15 +1,12 @@
 package io.mycat.parser.druid;
 
-import io.mycat.route.impl.DruidMycatRouteStrategy;
 import io.mycat.route.parser.druid.MycatSchemaStatVisitor;
 
-import java.sql.SQLSyntaxErrorException;
 import java.util.ArrayList;
 import java.util.List;
 
 import junit.framework.Assert;
 
-import org.apache.log4j.Logger;
 import org.junit.Test;
 
 import com.alibaba.druid.sql.ast.SQLStatement;
diff --git a/src/test/java/io/mycat/performance/AbstractMultiTreadBatchTester.java b/src/test/java/io/mycat/performance/AbstractMultiTreadBatchTester.java
index 53fa47694..bc1a15b4e 100644
--- a/src/test/java/io/mycat/performance/AbstractMultiTreadBatchTester.java
+++ b/src/test/java/io/mycat/performance/AbstractMultiTreadBatchTester.java
@@ -23,14 +23,12 @@
  */
 package io.mycat.performance;
 
-import java.io.FileInputStream;
 import java.sql.SQLException;
 import java.text.SimpleDateFormat;
 import java.util.ArrayList;
 import java.util.Date;
 import java.util.Iterator;
 import java.util.LinkedList;
-import java.util.Properties;
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.atomic.AtomicLong;
diff --git a/src/test/java/io/mycat/route/function/AutoPartitionByLongTest.java b/src/test/java/io/mycat/route/function/AutoPartitionByLongTest.java
index b202289f5..d78ae61ba 100644
--- a/src/test/java/io/mycat/route/function/AutoPartitionByLongTest.java
+++ b/src/test/java/io/mycat/route/function/AutoPartitionByLongTest.java
@@ -23,7 +23,6 @@
  */
 package io.mycat.route.function;
 
-import io.mycat.route.function.AutoPartitionByLong;
 import junit.framework.Assert;
 
 import org.junit.Test;
diff --git a/src/test/java/io/mycat/route/function/PartitionByDateTest.java b/src/test/java/io/mycat/route/function/PartitionByDateTest.java
index a93533214..fb69cedb8 100644
--- a/src/test/java/io/mycat/route/function/PartitionByDateTest.java
+++ b/src/test/java/io/mycat/route/function/PartitionByDateTest.java
@@ -23,8 +23,6 @@
  */
 package io.mycat.route.function;
 
-import io.mycat.route.function.PartitionByDate;
-
 import org.junit.Assert;
 import org.junit.Test;
 
diff --git a/src/test/java/io/mycat/route/function/PartitionByJumpConsistentHashTest.java b/src/test/java/io/mycat/route/function/PartitionByJumpConsistentHashTest.java
index c3252cce8..4f573c66c 100644
--- a/src/test/java/io/mycat/route/function/PartitionByJumpConsistentHashTest.java
+++ b/src/test/java/io/mycat/route/function/PartitionByJumpConsistentHashTest.java
@@ -1,6 +1,5 @@
 package io.mycat.route.function;
 
-import io.mycat.route.function.PartitionByJumpConsistentHash;
 import junit.framework.Assert;
 
 import org.junit.Test;
diff --git a/src/test/java/io/mycat/route/function/PartitionByMonthTest.java b/src/test/java/io/mycat/route/function/PartitionByMonthTest.java
index ea324de90..78907ea17 100644
--- a/src/test/java/io/mycat/route/function/PartitionByMonthTest.java
+++ b/src/test/java/io/mycat/route/function/PartitionByMonthTest.java
@@ -23,8 +23,6 @@
  */
 package io.mycat.route.function;
 
-import io.mycat.route.function.PartitionByMonth;
-
 import org.junit.Assert;
 import org.junit.Test;
 
diff --git a/src/test/java/io/mycat/route/function/PartitionByPatternTest.java b/src/test/java/io/mycat/route/function/PartitionByPatternTest.java
index d7812a50b..a22b4c67d 100644
--- a/src/test/java/io/mycat/route/function/PartitionByPatternTest.java
+++ b/src/test/java/io/mycat/route/function/PartitionByPatternTest.java
@@ -23,8 +23,6 @@
  */
 package io.mycat.route.function;
 
-import io.mycat.route.function.PartitionByPattern;
-
 import org.junit.Assert;
 import org.junit.Test;
 
diff --git a/src/test/java/io/mycat/route/function/PartitionByPrefixPatternTest.java b/src/test/java/io/mycat/route/function/PartitionByPrefixPatternTest.java
index 13078b86e..9ba9a38ae 100644
--- a/src/test/java/io/mycat/route/function/PartitionByPrefixPatternTest.java
+++ b/src/test/java/io/mycat/route/function/PartitionByPrefixPatternTest.java
@@ -23,7 +23,6 @@
  */
 package io.mycat.route.function;
 
-import io.mycat.route.function.PartitionByPrefixPattern;
 import junit.framework.Assert;
 
 import org.junit.Test;
diff --git a/src/test/java/io/mycat/route/function/PartitionByStringTest.java b/src/test/java/io/mycat/route/function/PartitionByStringTest.java
index 0ce077068..9cd50961c 100644
--- a/src/test/java/io/mycat/route/function/PartitionByStringTest.java
+++ b/src/test/java/io/mycat/route/function/PartitionByStringTest.java
@@ -23,8 +23,6 @@
  */
 package io.mycat.route.function;
 
-import io.mycat.route.function.PartitionByString;
-
 import org.junit.Assert;
 import org.junit.Test;
 
diff --git a/src/test/java/io/mycat/route/function/PartitionByVelocityTest.java b/src/test/java/io/mycat/route/function/PartitionByVelocityTest.java
index 1e0942609..363b6c94f 100644
--- a/src/test/java/io/mycat/route/function/PartitionByVelocityTest.java
+++ b/src/test/java/io/mycat/route/function/PartitionByVelocityTest.java
@@ -23,8 +23,6 @@
  */
 package io.mycat.route.function;
 
-import io.mycat.route.function.PartitionByString;
-
 import org.junit.Assert;
 import org.junit.Test;
 
diff --git a/src/test/java/io/mycat/route/function/TestLatestMonthPartion.java b/src/test/java/io/mycat/route/function/TestLatestMonthPartion.java
index 5624b08a6..96ef15978 100644
--- a/src/test/java/io/mycat/route/function/TestLatestMonthPartion.java
+++ b/src/test/java/io/mycat/route/function/TestLatestMonthPartion.java
@@ -1,7 +1,6 @@
 package io.mycat.route.function;
 
 import static org.junit.Assert.assertTrue;
-import io.mycat.route.function.LatestMonthPartion;
 
 import org.junit.Test;
 
diff --git a/src/test/java/io/mycat/route/function/TestNumberParseUtil.java b/src/test/java/io/mycat/route/function/TestNumberParseUtil.java
index f0fd2bf3c..0caf7abcc 100644
--- a/src/test/java/io/mycat/route/function/TestNumberParseUtil.java
+++ b/src/test/java/io/mycat/route/function/TestNumberParseUtil.java
@@ -23,12 +23,10 @@
  */
 package io.mycat.route.function;
 
-import io.mycat.route.function.NumberParseUtil;
+import junit.framework.Assert;
 
 import org.junit.Test;
 
-import junit.framework.Assert;
-
 public class TestNumberParseUtil {
 
 	@Test
diff --git a/src/test/java/io/mycat/route/util/PartitionUtilTest.java b/src/test/java/io/mycat/route/util/PartitionUtilTest.java
index d4cca9d90..164fd6531 100644
--- a/src/test/java/io/mycat/route/util/PartitionUtilTest.java
+++ b/src/test/java/io/mycat/route/util/PartitionUtilTest.java
@@ -23,8 +23,6 @@
  */
 package io.mycat.route.util;
 
-import io.mycat.route.util.PartitionUtil;
-
 import org.junit.Assert;
 import org.junit.Test;
 
diff --git a/src/test/java/io/mycat/sqlexecute/TestJdbc.java b/src/test/java/io/mycat/sqlexecute/TestJdbc.java
index db6fe5572..d92ff81aa 100644
--- a/src/test/java/io/mycat/sqlexecute/TestJdbc.java
+++ b/src/test/java/io/mycat/sqlexecute/TestJdbc.java
@@ -4,10 +4,6 @@
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.SQLException;
-import java.sql.Statement;
-import java.util.ArrayList;
-import java.util.Date;
-import java.util.List;
 
 public class TestJdbc {
 	public static void main(String[] args) throws SQLException {
diff --git a/src/test/java/io/mycat/util/HexFormatUtilMain.java b/src/test/java/io/mycat/util/HexFormatUtilMain.java
index 613c461dc..7c946428e 100644
--- a/src/test/java/io/mycat/util/HexFormatUtilMain.java
+++ b/src/test/java/io/mycat/util/HexFormatUtilMain.java
@@ -23,8 +23,6 @@
  */
 package io.mycat.util;
 
-import io.mycat.util.HexFormatUtil;
-
 import java.util.ArrayList;
 import java.util.List;
 
diff --git a/src/test/java/io/mycat/util/SmallSetTest.java b/src/test/java/io/mycat/util/SmallSetTest.java
index a4ab65e54..f7d1427f1 100644
--- a/src/test/java/io/mycat/util/SmallSetTest.java
+++ b/src/test/java/io/mycat/util/SmallSetTest.java
@@ -23,8 +23,6 @@
  */
 package io.mycat.util;
 
-import io.mycat.util.SmallSet;
-
 import java.util.Collection;
 import java.util.Iterator;
 
diff --git a/src/test/java/io/mycat/util/SplitUtilTest.java b/src/test/java/io/mycat/util/SplitUtilTest.java
index ec96bdfd4..b97aa4233 100644
--- a/src/test/java/io/mycat/util/SplitUtilTest.java
+++ b/src/test/java/io/mycat/util/SplitUtilTest.java
@@ -23,7 +23,6 @@
  */
 package io.mycat.util;
 
-import io.mycat.util.SplitUtil;
 import junit.framework.Assert;
 
 import org.junit.Test;
diff --git a/src/test/java/io/mycat/util/StringHashPerfMain.java b/src/test/java/io/mycat/util/StringHashPerfMain.java
index 6fb59c2f8..281cd79b5 100644
--- a/src/test/java/io/mycat/util/StringHashPerfMain.java
+++ b/src/test/java/io/mycat/util/StringHashPerfMain.java
@@ -23,7 +23,6 @@
  */
 package io.mycat.util;
 
-import io.mycat.util.StringUtil;
 
 /**
  * @author mycat
diff --git a/src/test/java/io/mycat/util/StringUtilTest.java b/src/test/java/io/mycat/util/StringUtilTest.java
index b31623661..a79bad6f5 100644
--- a/src/test/java/io/mycat/util/StringUtilTest.java
+++ b/src/test/java/io/mycat/util/StringUtilTest.java
@@ -23,8 +23,6 @@
  */
 package io.mycat.util;
 
-import io.mycat.util.StringUtil;
-
 import java.io.PrintWriter;
 import java.io.StringWriter;