diff --git a/src/main/java/com/alibaba/druid/mapping/MappingEngine.java b/src/main/java/com/alibaba/druid/mapping/MappingEngine.java
index b3567dc234..8257f4c5e9 100644
--- a/src/main/java/com/alibaba/druid/mapping/MappingEngine.java
+++ b/src/main/java/com/alibaba/druid/mapping/MappingEngine.java
@@ -7,6 +7,7 @@ import com.alibaba.druid.sql.ast.expr.SQLNumberExpr;
 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.visitor.SQLASTVisitor;
 
 public class MappingEngine {
 
@@ -29,13 +30,22 @@ public class MappingEngine {
         this.entities.put(entity.getName(), entity);
     }
 
-    public MySqlMappingVisitor createMappingVisitor() {
+    public SQLASTVisitor createMySqlMappingVisitor() {
         return new MySqlMappingVisitor(entities);
     }
 
-    public String explain(String sql) {
-        MySqlSelectQueryBlock query = explainToSQLObject(sql);
+    public String explainToMySql(String sql) {
+        MySqlSelectQueryBlock query = explainToMySqlObject(sql);
 
+        query.accept(this.createMySqlMappingVisitor());
+
+        return SQLUtils.toMySqlString(query);
+    }
+
+    public MySqlSelectQueryBlock explainToMySqlObject(String sql) {
+        MySqlSelectParser selectParser = new MySqlSelectParser(sql);
+        MySqlSelectQueryBlock query = (MySqlSelectQueryBlock) selectParser.query();
+        
         if (this.maxLimit != null) {
             if (query.getLimit() == null) {
                 Limit limit = new Limit();
@@ -49,15 +59,7 @@ public class MappingEngine {
                 }
             }
         }
-
-        query.accept(this.createMappingVisitor());
-
-        return SQLUtils.toMySqlString(query);
-    }
-
-    public MySqlSelectQueryBlock explainToSQLObject(String sql) {
-        MySqlSelectParser selectParser = new MySqlSelectParser(sql);
-        MySqlSelectQueryBlock query = (MySqlSelectQueryBlock) selectParser.query();
+        
         return query;
     }
 }
diff --git a/src/main/java/com/alibaba/druid/mapping/MappingVisitor.java b/src/main/java/com/alibaba/druid/mapping/MappingVisitor.java
new file mode 100644
index 0000000000..4436c3e296
--- /dev/null
+++ b/src/main/java/com/alibaba/druid/mapping/MappingVisitor.java
@@ -0,0 +1,15 @@
+package com.alibaba.druid.mapping;
+
+import java.util.Map;
+
+import com.alibaba.druid.sql.ast.statement.SQLTableSource;
+
+public interface MappingVisitor {
+	Entity getFirstEntity();
+	
+	Entity getEntity(String name);
+	
+	Map<String, Entity> getEntities();
+	
+	Map<String, SQLTableSource> getTableSources();
+}
diff --git a/src/main/java/com/alibaba/druid/mapping/MappingVisitorUtils.java b/src/main/java/com/alibaba/druid/mapping/MappingVisitorUtils.java
new file mode 100644
index 0000000000..28acc3d4be
--- /dev/null
+++ b/src/main/java/com/alibaba/druid/mapping/MappingVisitorUtils.java
@@ -0,0 +1,103 @@
+package com.alibaba.druid.mapping;
+
+import com.alibaba.druid.sql.ast.SQLExpr;
+import com.alibaba.druid.sql.ast.expr.SQLAllColumnExpr;
+import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
+import com.alibaba.druid.sql.ast.statement.SQLExprTableSource;
+import com.alibaba.druid.sql.ast.statement.SQLSelectItem;
+import com.alibaba.druid.sql.ast.statement.SQLSelectQueryBlock;
+import com.alibaba.druid.sql.ast.statement.SQLTableSource;
+
+public class MappingVisitorUtils {
+    public static boolean visit(MappingVisitor visitor, SQLExprTableSource x) {
+        SQLExpr expr = x.getExpr();
+
+        if (expr instanceof SQLIdentifierExpr) {
+            SQLIdentifierExpr tableExpr = (SQLIdentifierExpr) expr;
+            String entityName = tableExpr.getName();
+
+            Entity entity = visitor.getEntity(entityName);
+
+            if (entity == null) {
+                throw new DruidMappingException("entity not foudn : " + entityName);
+            }
+
+            tableExpr.setName(entity.getTableName());
+        }
+
+        if (x.getAlias() != null) {
+            visitor.getTableSources().put(x.getAlias(), x);
+        }
+
+        return false;
+    }
+    
+    public static boolean visit(MappingVisitor visitor, SQLTableSource x) {
+        if (x.getAlias() != null) {
+            visitor.getTableSources().put(x.getAlias(), x);
+        }
+        
+        return true;
+    }
+
+    public static void fillSelectList(MappingVisitor visitor, SQLSelectQueryBlock x) {
+        Entity entity = visitor.getFirstEntity();
+
+        for (Property item : entity.getProperties().values()) {
+            x.getSelectList().add(new SQLSelectItem(new SQLIdentifierExpr(item.getName()), '"' + item.getName() + '"'));
+        }
+    }
+
+    public static boolean visit(MappingVisitor visitor, SQLIdentifierExpr x) {
+        String propertyName = x.getName();
+
+        Property property = null;
+        for (Entity entity : visitor.getEntities().values()) {
+            property = entity.getProperty(propertyName);
+            if (property != null) {
+                break;
+            }
+        }
+
+        if (property == null) {
+            throw new DruidMappingException("property not found : " + propertyName);
+        }
+
+        String dbColumName = property.getDbColumnName();
+        x.setName(dbColumName);
+
+        if (x.getParent() instanceof SQLSelectItem) {
+            SQLSelectItem selectItem = (SQLSelectItem) x.getParent();
+            if (selectItem.getAlias() == null) {
+                selectItem.setAlias('"' + property.getName() + '"');
+            }
+        }
+
+        return false;
+    }
+
+    public static boolean visit(MappingVisitor visitor, SQLSelectQueryBlock x) {
+        if (x.getSelectList().size() == 0) {
+            fillSelectList(visitor, x);
+        }
+
+        if (x.getSelectList().size() == 1) {
+            if (x.getSelectList().get(0).getExpr() instanceof SQLAllColumnExpr) {
+                x.getSelectList().clear();
+                fillSelectList(visitor, x);
+            }
+        }
+
+        if (x.getFrom() == null) {
+            Entity firstEntity = visitor.getFirstEntity();
+            SQLExprTableSource from = new SQLExprTableSource(new SQLIdentifierExpr(firstEntity.getName()));
+            x.setFrom(from);
+        }
+
+        for (SQLSelectItem item : x.getSelectList()) {
+            item.setParent(x);
+        }
+
+        return true;
+    }
+}
diff --git a/src/main/java/com/alibaba/druid/mapping/MySqlMappingVisitor.java b/src/main/java/com/alibaba/druid/mapping/MySqlMappingVisitor.java
index 9f4faa1c0a..25eacdc031 100644
--- a/src/main/java/com/alibaba/druid/mapping/MySqlMappingVisitor.java
+++ b/src/main/java/com/alibaba/druid/mapping/MySqlMappingVisitor.java
@@ -3,23 +3,29 @@ package com.alibaba.druid.mapping;
 import java.util.LinkedHashMap;
 import java.util.Map;
 
-import com.alibaba.druid.sql.ast.SQLExpr;
-import com.alibaba.druid.sql.ast.expr.SQLAllColumnExpr;
 import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
 import com.alibaba.druid.sql.ast.statement.SQLExprTableSource;
+import com.alibaba.druid.sql.ast.statement.SQLJoinTableSource;
 import com.alibaba.druid.sql.ast.statement.SQLSelectItem;
 import com.alibaba.druid.sql.ast.statement.SQLSelectQueryBlock;
+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.visitor.MySqlASTVisitorAdapter;
 
-public class MySqlMappingVisitor extends MySqlASTVisitorAdapter {
+public class MySqlMappingVisitor extends MySqlASTVisitorAdapter implements MappingVisitor {
 
     private final LinkedHashMap<String, Entity> entities;
+    private final Map<String, SQLTableSource>   tableSources = new LinkedHashMap<String, SQLTableSource>();
 
     public MySqlMappingVisitor(LinkedHashMap<String, Entity> entities){
         this.entities = entities;
     }
 
+    public Map<String, SQLTableSource> getTableSources() {
+        return tableSources;
+    }
+
     public Map<String, Entity> getEntities() {
         return entities;
     }
@@ -53,98 +59,30 @@ public class MySqlMappingVisitor extends MySqlASTVisitorAdapter {
     }
 
     public boolean visit(MySqlSelectQueryBlock x) {
-        if (x.getSelectList().size() == 0) {
-            fillSelectList(x);
-        }
-
-        if (x.getSelectList().size() == 1) {
-            if (x.getSelectList().get(0).getExpr() instanceof SQLAllColumnExpr) {
-                x.getSelectList().clear();
-                fillSelectList(x);
-            }
-        }
-        
-        if (x.getFrom() == null) {
-            Entity firstEntity = this.getFirstEntity();
-            SQLExprTableSource from = new SQLExprTableSource(new SQLIdentifierExpr(firstEntity.getName()));
-            x.setFrom(from);
-        }
-
-        for (SQLSelectItem item : x.getSelectList()) {
-            item.setParent(x);
-        }
-
-        return super.visit(x);
+        return MappingVisitorUtils.visit(this, x);
     }
 
     public boolean visit(SQLSelectQueryBlock x) {
-        if (x instanceof MySqlSelectQueryBlock) {
-            return visit((MySqlSelectQueryBlock) x);
-        }
-
-        if (x.getSelectList().size() == 0) {
-            fillSelectList(x);
-        }
-
-        for (SQLSelectItem item : x.getSelectList()) {
-            item.setParent(x);
-        }
-
-        return super.visit(x);
+        return MappingVisitorUtils.visit(this, x);
     }
 
     protected void fillSelectList(SQLSelectQueryBlock x) {
-        Entity entity = getFirstEntity();
-
-        for (Property item : entity.getProperties().values()) {
-            x.getSelectList().add(new SQLSelectItem(new SQLIdentifierExpr(item.getName()), '"' + item.getName() + '"'));
-        }
+        MappingVisitorUtils.fillSelectList(this, x);
     }
 
     public boolean visit(SQLIdentifierExpr x) {
-        String propertyName = x.getName();
+        return MappingVisitorUtils.visit(this, x);
+    }
 
-        Property property = null;
-        for (Entity entity : this.entities.values()) {
-            property = entity.getProperty(propertyName);
-            if (property != null) {
-                break;
-            }
-        }
+    public boolean visit(SQLSubqueryTableSource x) {
+        return MappingVisitorUtils.visit(this, x);
+    }
 
-        if (property == null) {
-            throw new DruidMappingException("property not found : " + propertyName);
-        }
-
-        String dbColumName = property.getDbColumnName();
-        x.setName(dbColumName);
-
-        if (x.getParent() instanceof SQLSelectItem) {
-            SQLSelectItem selectItem = (SQLSelectItem) x.getParent();
-            if (selectItem.getAlias() == null) {
-                selectItem.setAlias('"' + property.getName() + '"');
-            }
-        }
-
-        return false;
+    public boolean visit(SQLJoinTableSource x) {
+        return MappingVisitorUtils.visit(this, x);
     }
 
     public boolean visit(SQLExprTableSource x) {
-        SQLExpr expr = x.getExpr();
-
-        if (expr instanceof SQLIdentifierExpr) {
-            SQLIdentifierExpr tableExpr = (SQLIdentifierExpr) expr;
-            String entityName = tableExpr.getName();
-
-            Entity entity = this.getEntity(entityName);
-            
-            if (entity == null) {
-                throw new DruidMappingException("entity not foudn : " + entityName);
-            }
-
-            tableExpr.setName(entity.getTableName());
-        }
-
-        return false;
+        return MappingVisitorUtils.visit(this, x);
     }
 }
diff --git a/src/main/java/com/alibaba/druid/mapping/OracleMappingVisitor.java b/src/main/java/com/alibaba/druid/mapping/OracleMappingVisitor.java
new file mode 100644
index 0000000000..dd09b3482e
--- /dev/null
+++ b/src/main/java/com/alibaba/druid/mapping/OracleMappingVisitor.java
@@ -0,0 +1,93 @@
+package com.alibaba.druid.mapping;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
+import com.alibaba.druid.sql.ast.statement.SQLExprTableSource;
+import com.alibaba.druid.sql.ast.statement.SQLJoinTableSource;
+import com.alibaba.druid.sql.ast.statement.SQLSelectItem;
+import com.alibaba.druid.sql.ast.statement.SQLSelectQueryBlock;
+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.OracleSelectQueryBlock;
+import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleSelectTableReference;
+import com.alibaba.druid.sql.dialect.oracle.visitor.OracleASTVIsitorAdapter;
+
+public class OracleMappingVisitor extends OracleASTVIsitorAdapter implements MappingVisitor {
+	private final LinkedHashMap<String, Entity> entities;
+	private final Map<String, SQLTableSource> tableSources = new LinkedHashMap<String, SQLTableSource>();
+
+	public OracleMappingVisitor(LinkedHashMap<String, Entity> entities) {
+		super();
+		this.entities = entities;
+	}
+
+	public LinkedHashMap<String, Entity> getEntities() {
+		return entities;
+	}
+
+	public Map<String, SQLTableSource> getTableSources() {
+		return tableSources;
+	}
+
+	public Entity getFirstEntity() {
+		for (Map.Entry<String, Entity> entry : entities.entrySet()) {
+			return entry.getValue();
+		}
+
+		return null;
+	}
+	
+	public Entity getEntity(String name) {
+		Entity entity = this.entities.get(name);
+
+		if (entity == null) {
+			for (Map.Entry<String, Entity> entry : entities.entrySet()) {
+				if (entry.getKey().equalsIgnoreCase(name)) {
+					entity = entry.getValue();
+					break;
+				}
+			}
+		}
+
+		return entity;
+	}
+	
+	   public boolean visit(SQLSelectItem x) {
+	        x.getExpr().setParent(x);
+	        return true;
+	    }
+
+	    public boolean visit(OracleSelectQueryBlock x) {
+	        return MappingVisitorUtils.visit(this, x);
+	    }
+
+	    public boolean visit(SQLSelectQueryBlock x) {
+	        return MappingVisitorUtils.visit(this, x);
+	    }
+
+	    protected void fillSelectList(SQLSelectQueryBlock x) {
+	        MappingVisitorUtils.fillSelectList(this, x);
+	    }
+
+	    public boolean visit(SQLIdentifierExpr x) {
+	        return MappingVisitorUtils.visit(this, x);
+	    }
+
+	    public boolean visit(SQLSubqueryTableSource x) {
+	        return MappingVisitorUtils.visit(this, x);
+	    }
+
+	    public boolean visit(SQLJoinTableSource x) {
+	        return MappingVisitorUtils.visit(this, x);
+	    }
+
+	    public boolean visit(SQLExprTableSource x) {
+	        return MappingVisitorUtils.visit(this, x);
+	    }
+	    
+	    public boolean visit(OracleSelectTableReference x) {
+	        return MappingVisitorUtils.visit(this, x);
+	    }
+}
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlASTVisitor.java b/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlASTVisitor.java
index 12e382ca59..b3da9c8ec4 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlASTVisitor.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlASTVisitor.java
@@ -187,4 +187,8 @@ public interface MySqlASTVisitor extends SQLASTVisitor {
     void endVisit(MySqlPartitionByKey x);
     
     boolean visit(MySqlPartitionByKey x);
+    
+    boolean visit(MySqlSelectQueryBlock x);
+    
+    void endVisit(MySqlSelectQueryBlock x);
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlASTVisitorAdapter.java b/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlASTVisitorAdapter.java
index 87cd27f764..c247564bf3 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlASTVisitorAdapter.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlASTVisitorAdapter.java
@@ -26,6 +26,7 @@ import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlReplicateStatement
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlResetStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlRollbackStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectGroupBy;
+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.ast.statement.MySqlShowColumnsStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowDatabasesStatement;
@@ -400,4 +401,14 @@ public class MySqlASTVisitorAdapter extends SQLASTVisitorAdapter implements
         return true;
     }
 
+    @Override
+    public boolean visit(MySqlSelectQueryBlock x) {
+        return true;
+    }
+
+    @Override
+    public void endVisit(MySqlSelectQueryBlock x) {
+        
+    }
+
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlOutputVisitor.java b/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlOutputVisitor.java
index 3395ff53c9..635045529c 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlOutputVisitor.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlOutputVisitor.java
@@ -1343,4 +1343,9 @@ public class MySqlOutputVisitor extends SQLASTOutputVisitor implements MySqlASTV
         }
         return false;
     }
+
+    @Override
+    public void endVisit(MySqlSelectQueryBlock x) {
+        
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlSchemaStatVisitor.java b/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlSchemaStatVisitor.java
index 4e4f72c3f3..91fa856636 100644
--- a/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlSchemaStatVisitor.java
+++ b/src/main/java/com/alibaba/druid/sql/dialect/mysql/visitor/MySqlSchemaStatVisitor.java
@@ -5,6 +5,7 @@ import java.util.Map;
 import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
 import com.alibaba.druid.sql.ast.statement.SQLDropTableStatement;
+import com.alibaba.druid.sql.ast.statement.SQLSelectQueryBlock;
 import com.alibaba.druid.sql.ast.statement.SQLSelectStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.MySqlKey;
 import com.alibaba.druid.sql.dialect.mysql.ast.MySqlPrimaryKey;
@@ -32,6 +33,7 @@ import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlReplicateStatement
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlResetStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlRollbackStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectGroupBy;
+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.ast.statement.MySqlShowColumnsStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowDatabasesStatement;
@@ -49,10 +51,11 @@ public class MySqlSchemaStatVisitor extends SchemaStatVisitor implements MySqlAS
     public boolean visit(SQLSelectStatement x) {
         setAliasMap();
         getAliasMap().put("DUAL", null);
-        
+
         return true;
     }
-    //DUAL
+
+    // DUAL
     public boolean visit(MySqlDeleteStatement x) {
         setAliasMap();
 
@@ -426,31 +429,45 @@ public class MySqlSchemaStatVisitor extends SchemaStatVisitor implements MySqlAS
     public boolean visit(UserSpecification x) {
         return true;
     }
-    
+
     @Override
     public void endVisit(MySqlDropUser x) {
-        
+
     }
-    
+
     @Override
     public boolean visit(MySqlDropUser x) {
         return true;
     }
+
     @Override
     public void endVisit(MySqlDropTableStatement x) {
-        
+
     }
+
     @Override
     public boolean visit(MySqlDropTableStatement x) {
         return visit((SQLDropTableStatement) x);
     }
+
     @Override
     public void endVisit(MySqlPartitionByKey x) {
-        
+
     }
+
     @Override
     public boolean visit(MySqlPartitionByKey x) {
         accept(x.getColumns());
         return false;
     }
+
+    @Override
+    public boolean visit(MySqlSelectQueryBlock x) {
+        return this.visit((SQLSelectQueryBlock) x);
+    }
+
+    @Override
+    public void endVisit(MySqlSelectQueryBlock x) {
+
+    }
 }
diff --git a/src/main/java/com/alibaba/druid/sql/visitor/SQLASTVisitor.java b/src/main/java/com/alibaba/druid/sql/visitor/SQLASTVisitor.java
index 6e41d7fda7..58610c2288 100644
--- a/src/main/java/com/alibaba/druid/sql/visitor/SQLASTVisitor.java
+++ b/src/main/java/com/alibaba/druid/sql/visitor/SQLASTVisitor.java
@@ -198,7 +198,7 @@ public interface SQLASTVisitor {
     boolean visit(SQLSelectQueryBlock x);
 
     void endVisit(SQLSelectQueryBlock x);
-
+    
     boolean visit(SQLExprTableSource x);
 
     void endVisit(SQLExprTableSource x);
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 2fce815d43..7b90d06e3a 100644
--- a/src/test/java/com/alibaba/druid/bvt/mapping/MappingVisitorTest.java
+++ b/src/test/java/com/alibaba/druid/bvt/mapping/MappingVisitorTest.java
@@ -26,18 +26,18 @@ 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.explain("select *"));
+        Assert.assertEquals("SELECT serviceTag AS \"编号\", ip AS \"IP地址\"\nFROM device", engine.explainToMySql("select *"));
         Assert.assertEquals("SELECT serviceTag AS \"编号\", ip AS \"IP地址\"\nFROM device\nWHERE ip = '127.0.0.1'",
-                            engine.explain("select 编号, IP地址 WHERE IP地址 = '127.0.0.1'"));
+                            engine.explainToMySql("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.explain("select *"));
+        Assert.assertEquals("SELECT serviceTag AS \"编号\", ip AS \"IP地址\"\nFROM device\nLIMIT 10", engine.explainToMySql("select *"));
         Assert.assertEquals("SELECT serviceTag AS \"编号\", ip AS \"IP地址\"\nFROM device\nWHERE ip = '127.0.0.1'\nLIMIT 10",
-                            engine.explain("select 编号, IP地址 WHERE IP地址 = '127.0.0.1'"));
+                            engine.explainToMySql("select 编号, IP地址 WHERE IP地址 = '127.0.0.1'"));
         
         engine.setMaxLimit(null);