diff --git a/src/main/java/com/alibaba/druid/mapping/MappingEngine.java b/src/main/java/com/alibaba/druid/mapping/MappingEngine.java
index 7bb53b783f..c5399790e7 100644
--- a/src/main/java/com/alibaba/druid/mapping/MappingEngine.java
+++ b/src/main/java/com/alibaba/druid/mapping/MappingEngine.java
@@ -5,6 +5,8 @@ import java.util.LinkedHashMap;
 import com.alibaba.druid.mapping.spi.MappingProvider;
 import com.alibaba.druid.mapping.spi.MappingVisitor;
 import com.alibaba.druid.mapping.spi.MySqlMappingProvider;
+import com.alibaba.druid.sql.ast.SQLObject;
+import com.alibaba.druid.sql.ast.statement.SQLDeleteStatement;
 import com.alibaba.druid.sql.ast.statement.SQLSelectQueryBlock;
 import com.alibaba.druid.sql.visitor.SQLASTOutputVisitor;
 
@@ -55,9 +57,25 @@ public class MappingEngine {
 
         query.accept(this.createMappingVisitor());
 
+        return toSQL(query);
+    }
+    
+    public SQLDeleteStatement explainToDeleteSQLObject(String sql) {
+        return provider.explainToDeleteSQLObject(this, sql);
+    }
+    
+    public String explainToDeleteSQLObjectSQL(String sql) {
+        SQLDeleteStatement query = explainToDeleteSQLObject(sql);
+
+        query.accept(this.createMappingVisitor());
+
+        return toSQL(query);
+    }
+
+    public String toSQL(SQLObject sqlObject) {
         StringBuilder out = new StringBuilder();
         SQLASTOutputVisitor outputVisitor = createOutputVisitor(out);
-        query.accept(outputVisitor);
+        sqlObject.accept(outputVisitor);
 
         return out.toString();
     }
diff --git a/src/main/java/com/alibaba/druid/mapping/spi/MSSQLServerMappingProvider.java b/src/main/java/com/alibaba/druid/mapping/spi/MSSQLServerMappingProvider.java
index 65361d06df..904b041560 100644
--- a/src/main/java/com/alibaba/druid/mapping/spi/MSSQLServerMappingProvider.java
+++ b/src/main/java/com/alibaba/druid/mapping/spi/MSSQLServerMappingProvider.java
@@ -2,10 +2,13 @@ package com.alibaba.druid.mapping.spi;
 
 import com.alibaba.druid.mapping.MappingEngine;
 import com.alibaba.druid.sql.ast.expr.SQLNumberExpr;
+import com.alibaba.druid.sql.ast.expr.SQLNumericLiteralExpr;
+import com.alibaba.druid.sql.ast.statement.SQLDeleteStatement;
 import com.alibaba.druid.sql.ast.statement.SQLSelectQueryBlock;
 import com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerSelectQueryBlock;
 import com.alibaba.druid.sql.dialect.sqlserver.ast.Top;
 import com.alibaba.druid.sql.dialect.sqlserver.parser.SQLServerSelectParser;
+import com.alibaba.druid.sql.dialect.sqlserver.parser.SQLServerStatementParser;
 import com.alibaba.druid.sql.dialect.sqlserver.visitor.SQLServerOutputVisitor;
 import com.alibaba.druid.sql.visitor.SQLASTOutputVisitor;
 
@@ -13,7 +16,7 @@ public class MSSQLServerMappingProvider implements MappingProvider {
 
     @Override
     public MappingVisitor createMappingVisitor(MappingEngine engine) {
-        return new MySqlMappingVisitor(engine.getEntities());
+        return new MSSQLServerMappingVisitor(engine.getEntities());
     }
 
     @Override
@@ -33,7 +36,7 @@ public class MSSQLServerMappingProvider implements MappingProvider {
                 top.setExpr(new SQLNumberExpr(maxLimit));
                 query.setTop(top);
             } else {
-                SQLNumberExpr rowCountExpr = (SQLNumberExpr) query.getTop().getExpr();
+                SQLNumericLiteralExpr rowCountExpr = (SQLNumericLiteralExpr) query.getTop().getExpr();
                 int rowCount = rowCountExpr.getNumber().intValue();
                 if (rowCount > maxLimit.intValue()) {
                     rowCountExpr.setNumber(maxLimit);
@@ -43,4 +46,9 @@ public class MSSQLServerMappingProvider implements MappingProvider {
 
         return query;
     }
+    
+    public SQLDeleteStatement explainToDeleteSQLObject(MappingEngine engine, String sql) {
+        SQLServerStatementParser parser = new SQLServerStatementParser(sql);
+        return parser.parseDeleteStatement();
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/mapping/spi/MappingProvider.java b/src/main/java/com/alibaba/druid/mapping/spi/MappingProvider.java
index 3aa78072ac..380f438ba7 100644
--- a/src/main/java/com/alibaba/druid/mapping/spi/MappingProvider.java
+++ b/src/main/java/com/alibaba/druid/mapping/spi/MappingProvider.java
@@ -1,6 +1,7 @@
 package com.alibaba.druid.mapping.spi;
 
 import com.alibaba.druid.mapping.MappingEngine;
+import com.alibaba.druid.sql.ast.statement.SQLDeleteStatement;
 import com.alibaba.druid.sql.ast.statement.SQLSelectQueryBlock;
 import com.alibaba.druid.sql.visitor.SQLASTOutputVisitor;
 
@@ -11,4 +12,6 @@ public interface MappingProvider {
     SQLASTOutputVisitor createOutputVisitor(MappingEngine engine, Appendable out);
 
     SQLSelectQueryBlock explainToSelectSQLObject(MappingEngine engine, String sql);
+    
+    SQLDeleteStatement explainToDeleteSQLObject(MappingEngine engine, String sql);
 }
diff --git a/src/main/java/com/alibaba/druid/mapping/spi/MySqlMappingProvider.java b/src/main/java/com/alibaba/druid/mapping/spi/MySqlMappingProvider.java
index 324779e2d0..92db029e86 100644
--- a/src/main/java/com/alibaba/druid/mapping/spi/MySqlMappingProvider.java
+++ b/src/main/java/com/alibaba/druid/mapping/spi/MySqlMappingProvider.java
@@ -1,11 +1,14 @@
 package com.alibaba.druid.mapping.spi;
 
 import com.alibaba.druid.mapping.MappingEngine;
-import com.alibaba.druid.sql.ast.expr.SQLNumberExpr;
+import com.alibaba.druid.sql.ast.expr.SQLIntegerExpr;
+import com.alibaba.druid.sql.ast.expr.SQLNumericLiteralExpr;
 import com.alibaba.druid.sql.ast.statement.SQLSelectQueryBlock;
+import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlDeleteStatement;
 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.mysql.parser.MySqlSelectParser;
+import com.alibaba.druid.sql.dialect.mysql.parser.MySqlStatementParser;
 import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlOutputVisitor;
 import com.alibaba.druid.sql.visitor.SQLASTOutputVisitor;
 
@@ -20,7 +23,7 @@ public class MySqlMappingProvider implements MappingProvider {
     public SQLASTOutputVisitor createOutputVisitor(MappingEngine engine, Appendable out) {
         return new MySqlOutputVisitor(out);
     }
-
+    
     public SQLSelectQueryBlock explainToSelectSQLObject(MappingEngine engine, String sql) {
         MySqlSelectParser selectParser = new MySqlSelectParser(sql);
         MySqlSelectQueryBlock query = (MySqlSelectQueryBlock) selectParser.query();
@@ -30,10 +33,10 @@ public class MySqlMappingProvider implements MappingProvider {
         if (maxLimit != null) {
             if (query.getLimit() == null) {
                 Limit limit = new Limit();
-                limit.setRowCount(new SQLNumberExpr(maxLimit));
+                limit.setRowCount(new SQLIntegerExpr(maxLimit));
                 query.setLimit(limit);
             } else {
-                SQLNumberExpr rowCountExpr = (SQLNumberExpr) query.getLimit().getRowCount();
+                SQLNumericLiteralExpr rowCountExpr = (SQLNumericLiteralExpr) query.getLimit().getRowCount();
                 int rowCount = rowCountExpr.getNumber().intValue();
                 if (rowCount > maxLimit.intValue()) {
                     rowCountExpr.setNumber(maxLimit);
@@ -43,4 +46,9 @@ public class MySqlMappingProvider implements MappingProvider {
 
         return query;
     }
+    
+    public MySqlDeleteStatement explainToDeleteSQLObject(MappingEngine engine, String sql) {
+        MySqlStatementParser parser = new MySqlStatementParser(sql);
+        return parser.parseDeleteStatement();
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/mapping/spi/OracleMappingProvider.java b/src/main/java/com/alibaba/druid/mapping/spi/OracleMappingProvider.java
index 5ee4557115..bd4850657b 100644
--- a/src/main/java/com/alibaba/druid/mapping/spi/OracleMappingProvider.java
+++ b/src/main/java/com/alibaba/druid/mapping/spi/OracleMappingProvider.java
@@ -2,8 +2,10 @@ package com.alibaba.druid.mapping.spi;
 
 import com.alibaba.druid.mapping.MappingEngine;
 import com.alibaba.druid.sql.ast.statement.SQLSelectQueryBlock;
+import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleDeleteStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleSelectQueryBlock;
 import com.alibaba.druid.sql.dialect.oracle.parser.OracleSelectParser;
+import com.alibaba.druid.sql.dialect.oracle.parser.OracleStatementParser;
 import com.alibaba.druid.sql.dialect.oracle.visitor.OracleOutputVisitor;
 import com.alibaba.druid.sql.visitor.SQLASTOutputVisitor;
 
@@ -26,4 +28,8 @@ public class OracleMappingProvider implements MappingProvider {
         return query;
     }
 
+    public OracleDeleteStatement explainToDeleteSQLObject(MappingEngine engine, String sql) {
+        OracleStatementParser parser = new OracleStatementParser(sql);
+        return parser.parseDeleteStatement();
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLNumericLiteralExpr.java b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLNumericLiteralExpr.java
index d688d499d0..420aebcd27 100644
--- a/src/main/java/com/alibaba/druid/sql/ast/expr/SQLNumericLiteralExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/ast/expr/SQLNumericLiteralExpr.java
@@ -24,4 +24,6 @@ public abstract class SQLNumericLiteralExpr extends SQLLiteralExpr {
     }
 
     public abstract Number getNumber();
+    
+    public abstract void setNumber(Number number);
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/mysql/parser/MySqlStatementParser.java b/src/main/java/com/alibaba/druid/sql/dialect/mysql/parser/MySqlStatementParser.java
index e086be60b9..5937075e72 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/mysql/parser/MySqlStatementParser.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/mysql/parser/MySqlStatementParser.java
@@ -26,7 +26,6 @@ import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
 import com.alibaba.druid.sql.ast.expr.SQLLiteralExpr;
 import com.alibaba.druid.sql.ast.expr.SQLQueryExpr;
 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.SQLSelectStatement;
@@ -87,7 +86,7 @@ public class MySqlStatementParser extends SQLStatementParser {
         return new SQLSelectStatement(new MySqlSelectParser(lexer).select());
     }
 
-    public SQLDeleteStatement parseDeleteStatement() throws ParserException {
+    public MySqlDeleteStatement parseDeleteStatement() throws ParserException {
         accept(Token.DELETE);
 
         MySqlDeleteStatement deleteStatement = new MySqlDeleteStatement();
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleBinaryDoubleExpr.java b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleBinaryDoubleExpr.java
index 88e16a7b0a..376b9c004d 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleBinaryDoubleExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleBinaryDoubleExpr.java
@@ -72,4 +72,14 @@ public class OracleBinaryDoubleExpr extends SQLNumericLiteralExpr implements Ora
         return true;
     }
 
+    @Override
+    public void setNumber(Number number) {
+        if (number == null) {
+            this.setValue(null);
+            return;
+        }
+        
+        this.setValue(number.doubleValue());
+    }
+
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleBinaryFloatExpr.java b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleBinaryFloatExpr.java
index d548e6e3b4..c5a0a1782f 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleBinaryFloatExpr.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/expr/OracleBinaryFloatExpr.java
@@ -72,4 +72,14 @@ public class OracleBinaryFloatExpr extends SQLNumericLiteralExpr implements Orac
         return true;
     }
 
+    @Override
+    public void setNumber(Number number) {
+        if (number == null) {
+            this.setValue(null);
+            return;
+        }
+        
+        this.setValue(number.floatValue());        
+    }
+
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/oracle/parser/OracleStatementParser.java b/src/main/java/com/alibaba/druid/sql/dialect/oracle/parser/OracleStatementParser.java
index 5b459fb69e..7591bd87b5 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/oracle/parser/OracleStatementParser.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/oracle/parser/OracleStatementParser.java
@@ -176,7 +176,7 @@ public class OracleStatementParser extends SQLStatementParser {
             }
 
             if (lexer.token() == (Token.DELETE)) {
-                statementList.add(parseDelete());
+                statementList.add(parseDeleteStatement());
                 continue;
             }
 
@@ -1413,7 +1413,7 @@ public class OracleStatementParser extends SQLStatementParser {
         return stmt;
     }
 
-    public OracleDeleteStatement parseDelete() throws ParserException {
+    public OracleDeleteStatement parseDeleteStatement() throws ParserException {
         accept(Token.DELETE);
 
         OracleDeleteStatement deleteStatement = new OracleDeleteStatement();
diff --git a/src/test/java/com/alibaba/druid/bvt/mapping/MappingVisitorSQLServerTest.java b/src/test/java/com/alibaba/druid/bvt/mapping/MappingVisitorSQLServerTest.java
new file mode 100644
index 0000000000..80f4c8cfe6
--- /dev/null
+++ b/src/test/java/com/alibaba/druid/bvt/mapping/MappingVisitorSQLServerTest.java
@@ -0,0 +1,49 @@
+package com.alibaba.druid.bvt.mapping;
+
+import junit.framework.TestCase;
+
+import org.junit.Assert;
+
+import com.alibaba.druid.mapping.Entity;
+import com.alibaba.druid.mapping.MappingEngine;
+import com.alibaba.druid.mapping.Property;
+import com.alibaba.druid.mapping.spi.MSSQLServerMappingProvider;
+
+public class MappingVisitorSQLServerTest extends TestCase {
+
+    MappingEngine engine = new MappingEngine(new MSSQLServerMappingProvider());
+
+    protected void setUp() throws Exception {
+        Entity entity = new Entity();
+        entity.setName("设备");
+        entity.setDescription("Device");
+        entity.setTableName("device");
+
+        entity.addProperty(new Property("编号", "", "serviceTag"));
+        entity.addProperty(new Property("IP地址", "", "ip"));
+
+        engine.addEntity(entity);
+    }
+
+    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\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 TOP 10 serviceTag AS \"编号\", ip AS \"IP地址\"\nFROM device", engine.explainToSelectSQL("select *"));
+        Assert.assertEquals("SELECT TOP 10 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'"));
+        
+        Assert.assertEquals("SELECT TOP 3 serviceTag AS \"编号\", ip AS \"IP地址\"\nFROM device\nWHERE ip = '127.0.0.1'",
+                            engine.explainToSelectSQL("select top 3 编号, IP地址 WHERE IP地址 = '127.0.0.1'"));
+        
+        engine.setMaxLimit(null);
+
+    }
+}
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 0523b464c2..4c6a7bd368 100644
--- a/src/test/java/com/alibaba/druid/bvt/mapping/MappingVisitorTest.java
+++ b/src/test/java/com/alibaba/druid/bvt/mapping/MappingVisitorTest.java
@@ -38,6 +38,8 @@ public class MappingVisitorTest extends TestCase {
         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"));
         
         engine.setMaxLimit(null);