diff --git a/sqlTranslate/.idea/workspace.xml b/sqlTranslate/.idea/workspace.xml
index 134f1e260..84610ff85 100644
--- a/sqlTranslate/.idea/workspace.xml
+++ b/sqlTranslate/.idea/workspace.xml
@@ -4,7 +4,10 @@
     <option name="autoReloadType" value="SELECTIVE" />
   </component>
   <component name="ChangeListManager">
-    <list default="true" id="d8d12963-4777-48e3-9669-309cf5e41d60" name="更改" comment="revise" />
+    <list default="true" id="d8d12963-4777-48e3-9669-309cf5e41d60" name="更改" comment="add exception classes">
+      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/main/java/Document/Exception in Oracle" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/Document/Exception in Oracle" afterDir="false" />
+    </list>
     <option name="SHOW_DIALOG" value="false" />
     <option name="HIGHLIGHT_CONFLICTS" value="true" />
     <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
@@ -101,13 +104,6 @@
       <option name="presentableId" value="Default" />
       <updated>1723106789329</updated>
     </task>
-    <task id="LOCAL-00027" summary="add case when">
-      <created>1725956415475</created>
-      <option name="number" value="00027" />
-      <option name="presentableId" value="LOCAL-00027" />
-      <option name="project" value="LOCAL" />
-      <updated>1725956415475</updated>
-    </task>
     <task id="LOCAL-00028" summary="revise">
       <created>1725958136981</created>
       <option name="number" value="00028" />
@@ -444,7 +440,14 @@
       <option name="project" value="LOCAL" />
       <updated>1726471059208</updated>
     </task>
-    <option name="localTasksCounter" value="76" />
+    <task id="LOCAL-00076" summary="add exception classes">
+      <created>1726471382852</created>
+      <option name="number" value="00076" />
+      <option name="presentableId" value="LOCAL-00076" />
+      <option name="project" value="LOCAL" />
+      <updated>1726471382852</updated>
+    </task>
+    <option name="localTasksCounter" value="77" />
     <servers />
   </component>
   <component name="Vcs.Log.Tabs.Properties">
@@ -459,7 +462,6 @@
     </option>
   </component>
   <component name="VcsManagerConfiguration">
-    <MESSAGE value="add select convert rules" />
     <MESSAGE value="add update ast class" />
     <MESSAGE value="add update convert rules" />
     <MESSAGE value="add Delete ast class" />
@@ -484,7 +486,8 @@
     <MESSAGE value="add Loop" />
     <MESSAGE value="add Exception document" />
     <MESSAGE value="revise" />
-    <option name="LAST_COMMIT_MESSAGE" value="revise" />
+    <MESSAGE value="add exception classes" />
+    <option name="LAST_COMMIT_MESSAGE" value="add exception classes" />
   </component>
   <component name="XDebuggerManager">
     <watches-manager>
diff --git a/sqlTranslate/src/main/java/Document/Exception in Oracle b/sqlTranslate/src/main/java/Document/Exception in Oracle
index 71952a4f3..769660b6f 100644
--- a/sqlTranslate/src/main/java/Document/Exception in Oracle	
+++ b/sqlTranslate/src/main/java/Document/Exception in Oracle	
@@ -1,3 +1,7 @@
+DECLARE
+    -- declaration of variable
+BEGIN
+    -- PL/SQL
 EXCEPTION
     -- custom exception
     WHEN e_custom_exception THEN
@@ -11,3 +15,4 @@ EXCEPTION
     -- other exceptions
     WHEN OTHERS THEN
         DBMS_OUTPUT.PUT_LINE('Caught an exception: ' || SQLERRM);
+END;
\ No newline at end of file
diff --git a/sqlTranslate/src/main/java/Parser/AST/Exception/CustomExceptionNode.java b/sqlTranslate/src/main/java/Parser/AST/Exception/CustomExceptionNode.java
index 16b209466..4ac330834 100644
--- a/sqlTranslate/src/main/java/Parser/AST/Exception/CustomExceptionNode.java
+++ b/sqlTranslate/src/main/java/Parser/AST/Exception/CustomExceptionNode.java
@@ -14,12 +14,10 @@ public class CustomExceptionNode extends ASTNode {
 
     public CustomExceptionNode (ASTNode node) {
         super(node);
-        setTokens(new ArrayList<>());
     }
 
     public CustomExceptionNode (List<Token> tokens) {
         super(tokens);
-        setTokens(new ArrayList<>());
     }
 
     @Override
diff --git a/sqlTranslate/src/main/java/Parser/AST/Exception/ExceptionActionNode.java b/sqlTranslate/src/main/java/Parser/AST/Exception/ExceptionActionNode.java
index 7d6a1d5b6..9665acd4f 100644
--- a/sqlTranslate/src/main/java/Parser/AST/Exception/ExceptionActionNode.java
+++ b/sqlTranslate/src/main/java/Parser/AST/Exception/ExceptionActionNode.java
@@ -14,12 +14,10 @@ public class ExceptionActionNode extends ASTNode {
 
     public ExceptionActionNode(ASTNode node) {
         super(node);
-        setTokens(new ArrayList<>());
     }
 
     public ExceptionActionNode(List<Token> tokens) {
         super(tokens);
-        setTokens(new ArrayList<>());
     }
 
     @Override
diff --git a/sqlTranslate/src/main/java/Parser/AST/Exception/ExceptionEndNode.java b/sqlTranslate/src/main/java/Parser/AST/Exception/ExceptionEndNode.java
new file mode 100644
index 000000000..a1b829638
--- /dev/null
+++ b/sqlTranslate/src/main/java/Parser/AST/Exception/ExceptionEndNode.java
@@ -0,0 +1,27 @@
+package Parser.AST.Exception;
+
+import Lexer.Token;
+import Parser.AST.ASTNode;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class ExceptionEndNode extends ASTNode {
+    public ExceptionEndNode() {
+        super();
+        setTokens(new ArrayList<>());
+    }
+
+    public ExceptionEndNode(ASTNode node) {
+        super(node);
+    }
+
+    public ExceptionEndNode(List<Token> tokens) {
+        super(tokens);
+    }
+
+    @Override
+    public void visit(ASTNode node, StringBuilder queryString) {
+
+    }
+}
diff --git a/sqlTranslate/src/main/java/Parser/AST/Exception/ExceptionNode.java b/sqlTranslate/src/main/java/Parser/AST/Exception/ExceptionNode.java
index 9ec0752aa..100833bec 100644
--- a/sqlTranslate/src/main/java/Parser/AST/Exception/ExceptionNode.java
+++ b/sqlTranslate/src/main/java/Parser/AST/Exception/ExceptionNode.java
@@ -15,12 +15,10 @@ public class ExceptionNode extends ASTNode {
 
     public ExceptionNode(ASTNode node) {
         super(node);
-        setTokens(new ArrayList<>());
     }
 
     public ExceptionNode(List<Token> tokens) {
         super(tokens);
-        setTokens(new ArrayList<>());
     }
     @Override
     public void visit(ASTNode node, StringBuilder queryString) {
diff --git a/sqlTranslate/src/main/java/Parser/AST/Exception/Invalid_numberNode.java b/sqlTranslate/src/main/java/Parser/AST/Exception/Invalid_numberNode.java
index e66e84b15..0a4045223 100644
--- a/sqlTranslate/src/main/java/Parser/AST/Exception/Invalid_numberNode.java
+++ b/sqlTranslate/src/main/java/Parser/AST/Exception/Invalid_numberNode.java
@@ -15,12 +15,10 @@ public class Invalid_numberNode extends ASTNode {
 
     public Invalid_numberNode(ASTNode node) {
         super(node);
-        setTokens(new ArrayList<>());
     }
 
     public Invalid_numberNode(List<Token> tokens) {
         super(tokens);
-        setTokens(new ArrayList<>());
     }
 
     @Override
diff --git a/sqlTranslate/src/main/java/Parser/AST/Exception/OtherExceptionNode.java b/sqlTranslate/src/main/java/Parser/AST/Exception/OtherExceptionNode.java
index 9d7ac557d..4dbd55964 100644
--- a/sqlTranslate/src/main/java/Parser/AST/Exception/OtherExceptionNode.java
+++ b/sqlTranslate/src/main/java/Parser/AST/Exception/OtherExceptionNode.java
@@ -15,12 +15,10 @@ public class OtherExceptionNode extends ASTNode {
 
     public OtherExceptionNode(ASTNode node) {
         super(node);
-        setTokens(new ArrayList<>());
     }
 
     public OtherExceptionNode(List<Token> tokens) {
         super(tokens);
-        setTokens(new ArrayList<>());
     }
 
     @Override
diff --git a/sqlTranslate/src/main/java/Parser/AST/Exception/Zero_divideNode.java b/sqlTranslate/src/main/java/Parser/AST/Exception/Zero_divideNode.java
index 7b29a0c9b..0b79158d8 100644
--- a/sqlTranslate/src/main/java/Parser/AST/Exception/Zero_divideNode.java
+++ b/sqlTranslate/src/main/java/Parser/AST/Exception/Zero_divideNode.java
@@ -15,12 +15,10 @@ public class Zero_divideNode extends ASTNode {
 
     public Zero_divideNode(ASTNode node) {
         super(node);
-        setTokens(new ArrayList<>());
     }
 
     public Zero_divideNode(List<Token> tokens) {
         super(tokens);
-        setTokens(new ArrayList<>());
     }
 
     @Override
diff --git a/sqlTranslate/src/main/java/Parser/AST/IFELSIF/ELSENode.java b/sqlTranslate/src/main/java/Parser/AST/IFELSIF/ELSENode.java
index dfb142007..d14c3d61f 100644
--- a/sqlTranslate/src/main/java/Parser/AST/IFELSIF/ELSENode.java
+++ b/sqlTranslate/src/main/java/Parser/AST/IFELSIF/ELSENode.java
@@ -14,12 +14,10 @@ public class ELSENode extends ASTNode {
 
     public ELSENode(ASTNode node) {
         super(node);
-        setTokens(new ArrayList<>());
     }
 
     public ELSENode(List<Token> tokens) {
         super(tokens);
-        setTokens(new ArrayList<>());
     }
 
     @Override
diff --git a/sqlTranslate/src/main/java/Parser/AST/IFELSIF/ELSIFActionNode.java b/sqlTranslate/src/main/java/Parser/AST/IFELSIF/ELSIFActionNode.java
index 2c88cb197..2d88be55c 100644
--- a/sqlTranslate/src/main/java/Parser/AST/IFELSIF/ELSIFActionNode.java
+++ b/sqlTranslate/src/main/java/Parser/AST/IFELSIF/ELSIFActionNode.java
@@ -14,12 +14,10 @@ public class ELSIFActionNode extends ASTNode {
 
     public ELSIFActionNode(ASTNode node) {
         super(node);
-        setTokens(new ArrayList<>());
     }
 
     public ELSIFActionNode(List<Token> tokens) {
         super(tokens);
-        setTokens(new ArrayList<>());
     }
 
     @Override
diff --git a/sqlTranslate/src/main/java/Parser/AST/IFELSIF/ELSIFConditionNode.java b/sqlTranslate/src/main/java/Parser/AST/IFELSIF/ELSIFConditionNode.java
index 943791454..d0a2a1c10 100644
--- a/sqlTranslate/src/main/java/Parser/AST/IFELSIF/ELSIFConditionNode.java
+++ b/sqlTranslate/src/main/java/Parser/AST/IFELSIF/ELSIFConditionNode.java
@@ -14,12 +14,10 @@ public class ELSIFConditionNode extends ASTNode {
 
     public ELSIFConditionNode(ASTNode node) {
         super(node);
-        setTokens(new ArrayList<>());
     }
 
     public ELSIFConditionNode(List<Token> tokens) {
         super(tokens);
-        setTokens(new ArrayList<>());
     }
 
     @Override
diff --git a/sqlTranslate/src/main/java/Parser/AST/IFELSIF/EndIFNode.java b/sqlTranslate/src/main/java/Parser/AST/IFELSIF/EndIFNode.java
index b6aedf59a..bb39895d0 100644
--- a/sqlTranslate/src/main/java/Parser/AST/IFELSIF/EndIFNode.java
+++ b/sqlTranslate/src/main/java/Parser/AST/IFELSIF/EndIFNode.java
@@ -14,12 +14,10 @@ public class EndIFNode extends ASTNode {
 
     public EndIFNode (ASTNode node) {
         super(node);
-        setTokens(new ArrayList<>());
     }
 
     public EndIFNode (List<Token> tokens) {
         super(tokens);
-        setTokens(new ArrayList<>());
     }
 
     @Override
diff --git a/sqlTranslate/src/main/java/Parser/AST/IFELSIF/IFActionNode.java b/sqlTranslate/src/main/java/Parser/AST/IFELSIF/IFActionNode.java
index 5736d1470..e6ca67d1a 100644
--- a/sqlTranslate/src/main/java/Parser/AST/IFELSIF/IFActionNode.java
+++ b/sqlTranslate/src/main/java/Parser/AST/IFELSIF/IFActionNode.java
@@ -14,12 +14,10 @@ public class IFActionNode extends ASTNode {
 
     public IFActionNode(ASTNode node) {
         super(node);
-        setTokens(new ArrayList<>());
     }
 
     public IFActionNode(List<Token> tokens) {
         super(tokens);
-        setTokens(new ArrayList<>());
     }
 
     @Override
diff --git a/sqlTranslate/src/main/java/Parser/AST/IFELSIF/IFConditionNode.java b/sqlTranslate/src/main/java/Parser/AST/IFELSIF/IFConditionNode.java
index 462983042..12b392ca0 100644
--- a/sqlTranslate/src/main/java/Parser/AST/IFELSIF/IFConditionNode.java
+++ b/sqlTranslate/src/main/java/Parser/AST/IFELSIF/IFConditionNode.java
@@ -14,12 +14,10 @@ public class IFConditionNode extends ASTNode {
 
     public IFConditionNode(ASTNode node) {
         super(node);
-        setTokens(new ArrayList<>());
     }
 
     public IFConditionNode(List<Token> tokens) {
         super(tokens);
-        setTokens(new ArrayList<>());
     }
 
     @Override
diff --git a/sqlTranslate/src/main/java/Parser/AST/Loop/ForNode.java b/sqlTranslate/src/main/java/Parser/AST/Loop/ForNode.java
index c70d1ac3b..357e1725f 100644
--- a/sqlTranslate/src/main/java/Parser/AST/Loop/ForNode.java
+++ b/sqlTranslate/src/main/java/Parser/AST/Loop/ForNode.java
@@ -14,12 +14,10 @@ public class ForNode extends ASTNode {
 
     public ForNode(ASTNode node) {
         super(node);
-        setTokens(new ArrayList<>());
     }
 
     public ForNode(List<Token> tokens) {
         super(tokens);
-        setTokens(new ArrayList<>());
     }
 
     @Override
diff --git a/sqlTranslate/src/main/java/Parser/AST/Loop/LoopBodyNode.java b/sqlTranslate/src/main/java/Parser/AST/Loop/LoopBodyNode.java
index 84140970f..28655c4d9 100644
--- a/sqlTranslate/src/main/java/Parser/AST/Loop/LoopBodyNode.java
+++ b/sqlTranslate/src/main/java/Parser/AST/Loop/LoopBodyNode.java
@@ -14,12 +14,10 @@ public class LoopBodyNode extends ASTNode {
 
     public LoopBodyNode(ASTNode node) {
         super(node);
-        setTokens(new ArrayList<>());
     }
 
     public LoopBodyNode(List<Token> tokens) {
         super(tokens);
-        setTokens(new ArrayList<>());
     }
 
     @Override
diff --git a/sqlTranslate/src/main/java/Parser/AST/Loop/LoopEndNode.java b/sqlTranslate/src/main/java/Parser/AST/Loop/LoopEndNode.java
index 895b5a2a1..abcd3a56a 100644
--- a/sqlTranslate/src/main/java/Parser/AST/Loop/LoopEndNode.java
+++ b/sqlTranslate/src/main/java/Parser/AST/Loop/LoopEndNode.java
@@ -14,12 +14,10 @@ public class LoopEndNode extends ASTNode {
 
     public LoopEndNode(ASTNode node) {
         super(node);
-        setTokens(new ArrayList<>());
     }
 
     public LoopEndNode(List<Token> tokens) {
         super(tokens);
-        setTokens(new ArrayList<>());
     }
 
     @Override
diff --git a/sqlTranslate/src/main/java/Parser/AST/Loop/LoopExitNode.java b/sqlTranslate/src/main/java/Parser/AST/Loop/LoopExitNode.java
index 76f105c74..3311826a4 100644
--- a/sqlTranslate/src/main/java/Parser/AST/Loop/LoopExitNode.java
+++ b/sqlTranslate/src/main/java/Parser/AST/Loop/LoopExitNode.java
@@ -14,12 +14,10 @@ public class LoopExitNode extends ASTNode {
 
     public LoopExitNode(ASTNode node) {
         super(node);
-        setTokens(new ArrayList<>());
     }
 
     public LoopExitNode(List<Token> tokens) {
         super(tokens);
-        setTokens(new ArrayList<>());
     }
 
     @Override
diff --git a/sqlTranslate/src/main/java/Parser/AST/Loop/LoopNode.java b/sqlTranslate/src/main/java/Parser/AST/Loop/LoopNode.java
index 128005399..bd44a6b49 100644
--- a/sqlTranslate/src/main/java/Parser/AST/Loop/LoopNode.java
+++ b/sqlTranslate/src/main/java/Parser/AST/Loop/LoopNode.java
@@ -14,12 +14,10 @@ public class LoopNode extends ASTNode {
 
     public LoopNode(ASTNode node) {
         super(node);
-        setTokens(new ArrayList<>());
     }
 
     public LoopNode(List<Token> tokens) {
         super(tokens);
-        setTokens(new ArrayList<>());
     }
 
     @Override
diff --git a/sqlTranslate/src/main/java/Parser/AST/Loop/WhileNode.java b/sqlTranslate/src/main/java/Parser/AST/Loop/WhileNode.java
index 5574da7d3..31bfdc0b8 100644
--- a/sqlTranslate/src/main/java/Parser/AST/Loop/WhileNode.java
+++ b/sqlTranslate/src/main/java/Parser/AST/Loop/WhileNode.java
@@ -14,12 +14,10 @@ public class WhileNode extends ASTNode {
 
     public WhileNode(ASTNode node) {
         super(node);
-        setTokens(new ArrayList<>());
     }
 
     public WhileNode(List<Token> tokens) {
         super(tokens);
-        setTokens(new ArrayList<>());
     }
 
     @Override