change

src/connector/jdbc/src/main/java/com/taosdata/jdbc/AbstractStatement.java

@@ -2,7 +2,7 @@ package com.taosdata.jdbc;
 
 import java.sql.*;
 
-public abstract class AbstractStatement implements Statement {
+public abstract class AbstractStatement extends WrapperImpl implements Statement {
 
     private volatile boolean closeOnCompletion;
     private int fetchSize;
@@ -246,17 +246,4 @@ public abstract class AbstractStatement implements Statement {
         return this.closeOnCompletion;
     }
 
-    @Override
-    public <T> T unwrap(Class<T> iface) throws SQLException {
-        try {
-            return iface.cast(this);
-        } catch (ClassCastException cce) {
-            throw new SQLException("Unable to unwrap to " + iface.toString());
-        }
-    }
-
-    @Override
-    public boolean isWrapperFor(Class<?> iface) throws SQLException {
-        return iface.isInstance(this);
-    }
 }

src/connector/jdbc/src/main/java/com/taosdata/jdbc/WrapperImpl.java

+package com.taosdata.jdbc;
+
+import java.sql.SQLException;
+import java.sql.Wrapper;
+
+public class WrapperImpl implements Wrapper {
+
+    @Override
+    public <T> T unwrap(Class<T> iface) throws SQLException {
+        try {
+            return iface.cast(this);
+        } catch (ClassCastException cce) {
+            throw new SQLException("Unable to unwrap to " + iface.toString());
+        }
+    }
+
+    @Override
+    public boolean isWrapperFor(Class<?> iface) throws SQLException {
+        return iface.isInstance(this);
+    }
+}