diff --git a/src/main/java/com/alibaba/druid/mapping/MappingEngine.java b/src/main/java/com/alibaba/druid/mapping/MappingEngine.java
index 687149af60..a7aab55b37 100644
--- a/src/main/java/com/alibaba/druid/mapping/MappingEngine.java
+++ b/src/main/java/com/alibaba/druid/mapping/MappingEngine.java
@@ -1,7 +1,10 @@
 package com.alibaba.druid.mapping;
 
+import java.util.ArrayList;
 import java.util.LinkedHashMap;
+import java.util.List;
 
+import com.alibaba.druid.mapping.spi.ExportParameterVisitor;
 import com.alibaba.druid.mapping.spi.MappingProvider;
 import com.alibaba.druid.mapping.spi.MappingVisitor;
 import com.alibaba.druid.mapping.spi.MySqlMappingProvider;
@@ -26,6 +29,10 @@ public class MappingEngine {
         this.provider = provider;
     }
 
+    public MappingProvider getMappingProvider() {
+        return provider;
+    }
+
     public Integer getMaxLimit() {
         return maxLimit;
     }
@@ -93,16 +100,27 @@ public class MappingEngine {
 
         return toSQL(query);
     }
-    
+
     public SQLInsertStatement explainToInsertSQLObject(String sql) {
         return provider.explainToInsertSQLObject(this, sql);
     }
-    
+
     public String explainToInsertSQL(String sql) {
         SQLInsertStatement query = explainToInsertSQLObject(sql);
-        
+
         query.accept(this.createMappingVisitor());
-        
+
         return toSQL(query);
     }
+
+    public List<Object> exportParameters(SQLObject sqlObject) {
+        List<Object> parameters = new ArrayList<Object>();
+        exportParameters(sqlObject, parameters);
+        return parameters;
+    }
+
+    public void exportParameters(SQLObject sqlObject, List<Object> parameters) {
+        ExportParameterVisitor exporter = this.provider.createExportParameterVisitor(parameters);
+        sqlObject.accept(exporter);
+    }
 }
diff --git a/src/test/java/com/alibaba/druid/bvt/mapping/MappingVisitorTest.java b/src/test/java/com/alibaba/druid/bvt/mapping/MappingVisitorTest.java
index 4c6a7bd368..6504c90db1 100644
--- a/src/test/java/com/alibaba/druid/bvt/mapping/MappingVisitorTest.java
+++ b/src/test/java/com/alibaba/druid/bvt/mapping/MappingVisitorTest.java
@@ -26,21 +26,30 @@ public class MappingVisitorTest extends TestCase {
 
     public void test_0() throws Exception {
 
-        Assert.assertEquals("SELECT serviceTag AS \"编号\", ip AS \"IP地址\"\nFROM device", engine.explainToSelectSQL("select *"));
+        Assert.assertEquals("SELECT serviceTag AS \"编号\", ip AS \"IP地址\"\nFROM device",
+                            engine.explainToSelectSQL("select *"));
         Assert.assertEquals("SELECT serviceTag AS \"编号\", ip AS \"IP地址\"\nFROM device\nWHERE ip = '127.0.0.1'",
                             engine.explainToSelectSQL("select 编号, IP地址 WHERE IP地址 = '127.0.0.1'"));
 
     }
-    
+
     public void test_1() throws Exception {
         engine.setMaxLimit(10);
-        
-        Assert.assertEquals("SELECT serviceTag AS \"编号\", ip AS \"IP地址\"\nFROM device\nLIMIT 10", engine.explainToSelectSQL("select *"));
+
+        Assert.assertEquals("SELECT serviceTag AS \"编号\", ip AS \"IP地址\"\nFROM device\nLIMIT 10",
+                            engine.explainToSelectSQL("select *"));
         Assert.assertEquals("SELECT serviceTag AS \"编号\", ip AS \"IP地址\"\nFROM device\nWHERE ip = '127.0.0.1'\nLIMIT 10",
                             engine.explainToSelectSQL("select 编号, IP地址 WHERE IP地址 = '127.0.0.1'"));
         Assert.assertEquals("SELECT serviceTag AS \"编号\", ip AS \"IP地址\"\nFROM device\nWHERE ip = '127.0.0.1'\nLIMIT 3",
                             engine.explainToSelectSQL("select 编号, IP地址 WHERE IP地址 = '127.0.0.1' limit 3"));
-        
+        Assert.assertEquals(0, engine.exportParameters(engine.explainToSelectSQLObject("select 1")).size());
+        Assert.assertEquals(0,
+                            engine.exportParameters(engine.explainToSelectSQLObject("select 编号, IP地址 where 1 = 0")).size());
+        Assert.assertEquals(1,
+                            engine.exportParameters(engine.explainToSelectSQLObject("select 编号, IP地址 where 1 = 0 and IP地址 = '127.0.0.1'")).size());
+        Assert.assertEquals("127.0.0.1",
+                            engine.exportParameters(engine.explainToSelectSQLObject("select 编号, IP地址 where 1 = 0 and IP地址 = '127.0.0.1'")).get(0));
+
         engine.setMaxLimit(null);
 
     }