improved WallFilter support. issue #1923

src/main/java/com/alibaba/druid/sql/ast/statement/SQLAlterDatabaseStatement.java

@@ -19,7 +19,7 @@ import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.SQLStatementImpl;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLAlterDatabaseStatement extends SQLStatementImpl {
+public class SQLAlterDatabaseStatement extends SQLStatementImpl implements SQLAlterStatement {
 
     private SQLName name;
 

src/main/java/com/alibaba/druid/sql/ast/statement/SQLAlterStatement.java

@@ -0,0 +1,6 @@
+package com.alibaba.druid.sql.ast.statement;
+
+import com.alibaba.druid.sql.ast.SQLStatement;
+
+public interface SQLAlterStatement extends SQLStatement {
+}

src/main/java/com/alibaba/druid/sql/ast/statement/SQLAlterTableStatement.java

@@ -28,7 +28,7 @@ import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
 import com.alibaba.druid.sql.ast.expr.SQLPropertyExpr;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLAlterTableStatement extends SQLStatementImpl implements SQLDDLStatement {
+public class SQLAlterTableStatement extends SQLStatementImpl implements SQLDDLStatement, SQLAlterStatement {
 
     private SQLExprTableSource      tableSource;
     private List<SQLAlterTableItem> items                   = new ArrayList<SQLAlterTableItem>();

src/main/java/com/alibaba/druid/sql/ast/statement/SQLAlterViewRenameStatement.java

@@ -19,7 +19,7 @@ import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.SQLStatementImpl;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLAlterViewRenameStatement extends SQLStatementImpl {
+public class SQLAlterViewRenameStatement extends SQLStatementImpl implements SQLAlterStatement {
 
     private SQLName name;
     private SQLName to;

src/main/java/com/alibaba/druid/sql/ast/statement/SQLCreateDatabaseStatement.java

@@ -22,7 +22,7 @@ import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.SQLStatementImpl;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLCreateDatabaseStatement extends SQLStatementImpl {
+public class SQLCreateDatabaseStatement extends SQLStatementImpl implements SQLCreateStatement {
 
     private SQLName              name;
 

src/main/java/com/alibaba/druid/sql/ast/statement/SQLCreateFunctionStatement.java

@@ -25,7 +25,7 @@ import java.util.List;
 /**
  * Created by wenshao on 23/05/2017.
  */
-public class SQLCreateFunctionStatement extends SQLStatementImpl implements SQLDDLStatement {
+public class SQLCreateFunctionStatement extends SQLStatementImpl implements SQLCreateStatement {
     private SQLName definer;
 
     private boolean            create     = true;

src/main/java/com/alibaba/druid/sql/ast/statement/SQLCreateIndexStatement.java

@@ -25,7 +25,7 @@ import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
 import com.alibaba.druid.sql.ast.expr.SQLPropertyExpr;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLCreateIndexStatement extends SQLStatementImpl implements SQLDDLStatement {
+public class SQLCreateIndexStatement extends SQLStatementImpl implements SQLCreateStatement {
 
     private SQLName                    name;
 

src/main/java/com/alibaba/druid/sql/ast/statement/SQLCreateMaterializedViewStatement.java

@@ -27,7 +27,7 @@ import java.util.List;
 /**
  * Created by wenshao on 30/06/2017.
  */
-public class SQLCreateMaterializedViewStatement extends SQLStatementImpl implements OracleSegmentAttributes {
+public class SQLCreateMaterializedViewStatement extends SQLStatementImpl implements OracleSegmentAttributes, SQLCreateStatement {
     private SQLName name;
     private List<SQLName> columns = new ArrayList<SQLName>();
 

src/main/java/com/alibaba/druid/sql/ast/statement/SQLCreateProcedureStatement.java

@@ -24,7 +24,7 @@ import com.alibaba.druid.sql.ast.SQLStatement;
 import com.alibaba.druid.sql.ast.SQLStatementImpl;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLCreateProcedureStatement extends SQLStatementImpl {
+public class SQLCreateProcedureStatement extends SQLStatementImpl implements SQLCreateStatement {
 
     private SQLName            definer;
 

src/main/java/com/alibaba/druid/sql/ast/statement/SQLCreateSequenceStatement.java

@@ -26,7 +26,7 @@ import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 /**
  * Created by wenshao on 16/9/14.
  */
-public class SQLCreateSequenceStatement extends SQLStatementImpl implements SQLDDLStatement {
+public class SQLCreateSequenceStatement extends SQLStatementImpl implements SQLCreateStatement {
     private SQLName name;
 
     private SQLExpr startWith;

src/main/java/com/alibaba/druid/sql/ast/statement/SQLCreateStatement.java

@@ -0,0 +1,6 @@
+package com.alibaba.druid.sql.ast.statement;
+
+import com.alibaba.druid.sql.ast.SQLStatement;
+
+public interface SQLCreateStatement extends SQLDDLStatement {
+}

src/main/java/com/alibaba/druid/sql/ast/statement/SQLCreateTableStatement.java

@@ -31,7 +31,7 @@ import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 import com.alibaba.druid.util.ListDG;
 import com.alibaba.druid.util.lang.Consumer;
 
-public class SQLCreateTableStatement extends SQLStatementImpl implements SQLDDLStatement {
+public class SQLCreateTableStatement extends SQLStatementImpl implements SQLDDLStatement, SQLCreateStatement {
 
     protected boolean               ifNotExiists = false;
     protected Type                  type;

src/main/java/com/alibaba/druid/sql/ast/statement/SQLCreateTriggerStatement.java

@@ -23,7 +23,7 @@ import com.alibaba.druid.sql.ast.SQLStatement;
 import com.alibaba.druid.sql.ast.SQLStatementImpl;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLCreateTriggerStatement extends SQLStatementImpl {
+public class SQLCreateTriggerStatement extends SQLStatementImpl implements SQLCreateStatement {
 
     private SQLName                  name;
 

src/main/java/com/alibaba/druid/sql/ast/statement/SQLCreateViewStatement.java

@@ -29,7 +29,7 @@ import com.alibaba.druid.sql.ast.expr.SQLLiteralExpr;
 import com.alibaba.druid.sql.ast.expr.SQLPropertyExpr;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLCreateViewStatement extends SQLStatementImpl implements SQLDDLStatement {
+public class SQLCreateViewStatement extends SQLStatementImpl implements SQLCreateStatement {
 
     private boolean     orReplace   = false;
     private boolean     force       = false;

src/main/java/com/alibaba/druid/sql/ast/statement/SQLDropDatabaseStatement.java

@@ -19,7 +19,7 @@ import com.alibaba.druid.sql.ast.SQLExpr;
 import com.alibaba.druid.sql.ast.SQLStatementImpl;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLDropDatabaseStatement extends SQLStatementImpl implements SQLDDLStatement {
+public class SQLDropDatabaseStatement extends SQLStatementImpl implements SQLDropStatement {
 
     private SQLExpr database;
     private boolean ifExists;

src/main/java/com/alibaba/druid/sql/ast/statement/SQLDropFunctionStatement.java

@@ -19,7 +19,7 @@ import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.SQLStatementImpl;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLDropFunctionStatement extends SQLStatementImpl implements SQLDDLStatement {
+public class SQLDropFunctionStatement extends SQLStatementImpl implements SQLDropStatement {
 
     private SQLName name;
     private boolean ifExists;

src/main/java/com/alibaba/druid/sql/ast/statement/SQLDropIndexStatement.java

@@ -20,7 +20,7 @@ import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.SQLStatementImpl;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLDropIndexStatement extends SQLStatementImpl implements SQLDDLStatement {
+public class SQLDropIndexStatement extends SQLStatementImpl implements SQLDropStatement {
 
     private SQLName            indexName;
     private SQLExprTableSource tableName;

src/main/java/com/alibaba/druid/sql/ast/statement/SQLDropProcedureStatement.java

@@ -19,7 +19,7 @@ import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.SQLStatementImpl;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLDropProcedureStatement extends SQLStatementImpl implements SQLDDLStatement {
+public class SQLDropProcedureStatement extends SQLStatementImpl implements SQLDropStatement {
 
     private SQLName name;
     private boolean ifExists;

src/main/java/com/alibaba/druid/sql/ast/statement/SQLDropSequenceStatement.java

@@ -20,7 +20,7 @@ import com.alibaba.druid.sql.ast.SQLStatementImpl;
 import com.alibaba.druid.sql.ast.expr.SQLPropertyExpr;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLDropSequenceStatement extends SQLStatementImpl implements SQLDDLStatement {
+public class SQLDropSequenceStatement extends SQLStatementImpl implements SQLDropStatement {
 
     private SQLName name;
     private boolean ifExists;

src/main/java/com/alibaba/druid/sql/ast/statement/SQLDropStatement.java

@@ -0,0 +1,4 @@
+package com.alibaba.druid.sql.ast.statement;
+
+public interface SQLDropStatement extends SQLDDLStatement {
+}

src/main/java/com/alibaba/druid/sql/ast/statement/SQLDropTableSpaceStatement.java

@@ -19,7 +19,7 @@ import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.SQLStatementImpl;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLDropTableSpaceStatement extends SQLStatementImpl implements SQLDDLStatement {
+public class SQLDropTableSpaceStatement extends SQLStatementImpl implements SQLDropStatement {
 
     private SQLName name;
     private boolean ifExists;

src/main/java/com/alibaba/druid/sql/ast/statement/SQLDropTableStatement.java

@@ -24,7 +24,7 @@ import com.alibaba.druid.sql.ast.SQLStatementImpl;
 import com.alibaba.druid.sql.ast.expr.SQLPropertyExpr;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLDropTableStatement extends SQLStatementImpl implements SQLDDLStatement {
+public class SQLDropTableStatement extends SQLStatementImpl implements SQLDropStatement {
     private List<SQLCommentHint> hints;
 
     protected List<SQLExprTableSource> tableSources = new ArrayList<SQLExprTableSource>();

src/main/java/com/alibaba/druid/sql/ast/statement/SQLDropTriggerStatement.java

@@ -19,7 +19,7 @@ import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.SQLStatementImpl;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLDropTriggerStatement extends SQLStatementImpl implements SQLDDLStatement {
+public class SQLDropTriggerStatement extends SQLStatementImpl implements SQLDropStatement {
 
     private SQLName name;
     private boolean ifExists;

src/main/java/com/alibaba/druid/sql/ast/statement/SQLDropUserStatement.java

@@ -22,7 +22,7 @@ import com.alibaba.druid.sql.ast.SQLExpr;
 import com.alibaba.druid.sql.ast.SQLStatementImpl;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLDropUserStatement extends SQLStatementImpl implements SQLDDLStatement {
+public class SQLDropUserStatement extends SQLStatementImpl implements SQLDropStatement {
 
     private List<SQLExpr> users = new ArrayList<SQLExpr>(2);
     

src/main/java/com/alibaba/druid/sql/ast/statement/SQLDropViewStatement.java

@@ -22,7 +22,7 @@ import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.SQLStatementImpl;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
 
-public class SQLDropViewStatement extends SQLStatementImpl implements SQLDDLStatement {
+public class SQLDropViewStatement extends SQLStatementImpl implements SQLDropStatement {
 
     protected List<SQLExprTableSource> tableSources = new ArrayList<SQLExprTableSource>();
 

src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/statement/MySqlAlterUserStatement.java

@@ -19,9 +19,10 @@ import java.util.ArrayList;
 import java.util.List;
 
 import com.alibaba.druid.sql.ast.SQLExpr;
+import com.alibaba.druid.sql.ast.statement.SQLAlterStatement;
 import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlASTVisitor;
 
-public class MySqlAlterUserStatement extends MySqlStatementImpl {
+public class MySqlAlterUserStatement extends MySqlStatementImpl implements SQLAlterStatement {
 
     private final List<SQLExpr> users = new ArrayList<SQLExpr>();
     

src/main/java/com/alibaba/druid/sql/dialect/mysql/ast/statement/MySqlCreateUserStatement.java

@@ -19,10 +19,11 @@ import java.util.ArrayList;
 import java.util.List;
 
 import com.alibaba.druid.sql.ast.SQLExpr;
+import com.alibaba.druid.sql.ast.statement.SQLCreateStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.MySqlObjectImpl;
 import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlASTVisitor;
 
-public class MySqlCreateUserStatement extends MySqlStatementImpl {
+public class MySqlCreateUserStatement extends MySqlStatementImpl implements SQLCreateStatement {
 
     private List<UserSpecification> users = new ArrayList<UserSpecification>(2);
 

src/main/java/com/alibaba/druid/sql/dialect/odps/ast/OdpsAddStatisticStatement.java

@@ -16,10 +16,11 @@
 package com.alibaba.druid.sql.dialect.odps.ast;
 
 import com.alibaba.druid.sql.ast.SQLName;
+import com.alibaba.druid.sql.ast.statement.SQLAlterStatement;
 import com.alibaba.druid.sql.ast.statement.SQLExprTableSource;
 import com.alibaba.druid.sql.dialect.odps.visitor.OdpsASTVisitor;
 
-public class OdpsAddStatisticStatement extends OdpsStatementImpl {
+public class OdpsAddStatisticStatement extends OdpsStatementImpl implements SQLAlterStatement {
 
     private SQLExprTableSource table;
 

src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleAlterIndexStatement.java

@@ -21,7 +21,7 @@ import com.alibaba.druid.sql.ast.SQLObject;
 import com.alibaba.druid.sql.dialect.oracle.ast.OracleSQLObjectImpl;
 import com.alibaba.druid.sql.dialect.oracle.visitor.OracleASTVisitor;
 
-public class OracleAlterIndexStatement extends OracleStatementImpl {
+public class OracleAlterIndexStatement extends OracleStatementImpl implements OracleAlterStatement {
 
     private SQLName name;
 

src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleAlterProcedureStatement.java

@@ -18,7 +18,7 @@ package com.alibaba.druid.sql.dialect.oracle.ast.stmt;
 import com.alibaba.druid.sql.ast.SQLExpr;
 import com.alibaba.druid.sql.dialect.oracle.visitor.OracleASTVisitor;
 
-public class OracleAlterProcedureStatement extends OracleStatementImpl {
+public class OracleAlterProcedureStatement extends OracleStatementImpl implements OracleAlterStatement {
 
     private SQLExpr name;
 

src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleAlterSessionStatement.java

@@ -21,7 +21,7 @@ import java.util.List;
 import com.alibaba.druid.sql.ast.statement.SQLAssignItem;
 import com.alibaba.druid.sql.dialect.oracle.visitor.OracleASTVisitor;
 
-public class OracleAlterSessionStatement extends OracleStatementImpl {
+public class OracleAlterSessionStatement extends OracleStatementImpl implements OracleAlterStatement {
 
     private List<SQLAssignItem> items = new ArrayList<SQLAssignItem>();
 

src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleAlterStatement.java

@@ -0,0 +1,7 @@
+package com.alibaba.druid.sql.dialect.oracle.ast.stmt;
+
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.ast.statement.SQLAlterStatement;
+
+public interface OracleAlterStatement extends SQLAlterStatement, OracleStatement {
+}

src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleAlterSynonymStatement.java

@@ -18,7 +18,7 @@ package com.alibaba.druid.sql.dialect.oracle.ast.stmt;
 import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.dialect.oracle.visitor.OracleASTVisitor;
 
-public class OracleAlterSynonymStatement extends OracleStatementImpl {
+public class OracleAlterSynonymStatement extends OracleStatementImpl implements OracleAlterStatement {
 
     private SQLName name;
 

src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleAlterTablespaceStatement.java

@@ -18,7 +18,7 @@ package com.alibaba.druid.sql.dialect.oracle.ast.stmt;
 import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.dialect.oracle.visitor.OracleASTVisitor;
 
-public class OracleAlterTablespaceStatement extends OracleStatementImpl {
+public class OracleAlterTablespaceStatement extends OracleStatementImpl implements OracleAlterStatement {
 
     private SQLName                   name;
     private OracleAlterTablespaceItem item;

src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleAlterTriggerStatement.java

@@ -18,7 +18,7 @@ package com.alibaba.druid.sql.dialect.oracle.ast.stmt;
 import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.dialect.oracle.visitor.OracleASTVisitor;
 
-public class OracleAlterTriggerStatement extends OracleStatementImpl {
+public class OracleAlterTriggerStatement extends OracleStatementImpl implements OracleAlterStatement {
 
     private SQLName name;
 

src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleAlterViewStatement.java

@@ -18,7 +18,7 @@ package com.alibaba.druid.sql.dialect.oracle.ast.stmt;
 import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.dialect.oracle.visitor.OracleASTVisitor;
 
-public class OracleAlterViewStatement extends OracleStatementImpl {
+public class OracleAlterViewStatement extends OracleStatementImpl implements OracleAlterStatement {
 
     private SQLName name;
 

src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleCreateDatabaseDbLinkStatement.java

@@ -17,9 +17,10 @@ package com.alibaba.druid.sql.dialect.oracle.ast.stmt;
 
 import com.alibaba.druid.sql.ast.SQLExpr;
 import com.alibaba.druid.sql.ast.SQLName;
+import com.alibaba.druid.sql.ast.statement.SQLCreateStatement;
 import com.alibaba.druid.sql.dialect.oracle.visitor.OracleASTVisitor;
 
-public class OracleCreateDatabaseDbLinkStatement extends OracleStatementImpl {
+public class OracleCreateDatabaseDbLinkStatement extends OracleStatementImpl implements SQLCreateStatement {
 
     private boolean shared;
     private boolean _public;

src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleCreateIndexStatement.java

@@ -17,6 +17,7 @@ package com.alibaba.druid.sql.dialect.oracle.ast.stmt;
 
 import com.alibaba.druid.sql.ast.*;
 import com.alibaba.druid.sql.ast.statement.SQLCreateIndexStatement;
+import com.alibaba.druid.sql.ast.statement.SQLCreateStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.OracleSegmentAttributes;
 import com.alibaba.druid.sql.dialect.oracle.visitor.OracleASTVisitor;
 import com.alibaba.druid.sql.visitor.SQLASTVisitor;
@@ -25,7 +26,7 @@ import com.alibaba.druid.util.JdbcConstants;
 import java.util.ArrayList;
 import java.util.List;
 
-public class OracleCreateIndexStatement extends SQLCreateIndexStatement implements OracleDDLStatement, OracleSegmentAttributes {
+public class OracleCreateIndexStatement extends SQLCreateIndexStatement implements OracleDDLStatement, OracleSegmentAttributes, SQLCreateStatement {
 
     private boolean online            = false;
 

src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleCreatePackageStatement.java

@@ -17,6 +17,7 @@ package com.alibaba.druid.sql.dialect.oracle.ast.stmt;
 
 import com.alibaba.druid.sql.ast.SQLName;
 import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.ast.statement.SQLCreateStatement;
 import com.alibaba.druid.sql.dialect.oracle.visitor.OracleASTVisitor;
 import com.alibaba.druid.util.JdbcConstants;
 import org.apache.ibatis.jdbc.SQL;
@@ -27,7 +28,7 @@ import java.util.List;
 /**
  * Created by wenshao on 23/05/2017.
  */
-public class OracleCreatePackageStatement extends OracleStatementImpl {
+public class OracleCreatePackageStatement extends OracleStatementImpl implements SQLCreateStatement {
     private boolean            orReplace;
     private SQLName name;
 

src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleCreateSynonymStatement.java

@@ -1,9 +1,10 @@
 package com.alibaba.druid.sql.dialect.oracle.ast.stmt;
 
 import com.alibaba.druid.sql.ast.SQLName;
+import com.alibaba.druid.sql.ast.statement.SQLCreateStatement;
 import com.alibaba.druid.sql.dialect.oracle.visitor.OracleASTVisitor;
 
-public class OracleCreateSynonymStatement extends OracleStatementImpl {
+public class OracleCreateSynonymStatement extends OracleStatementImpl implements SQLCreateStatement {
     private boolean orReplace;
     private SQLName name;
     private boolean isPublic;

src/main/java/com/alibaba/druid/sql/dialect/oracle/ast/stmt/OracleDropDbLinkStatement.java

@@ -16,9 +16,10 @@
 package com.alibaba.druid.sql.dialect.oracle.ast.stmt;
 
 import com.alibaba.druid.sql.ast.SQLName;
+import com.alibaba.druid.sql.ast.statement.SQLDropStatement;
 import com.alibaba.druid.sql.dialect.oracle.visitor.OracleASTVisitor;
 
-public class OracleDropDbLinkStatement extends OracleStatementImpl {
+public class OracleDropDbLinkStatement extends OracleStatementImpl implements SQLDropStatement {
 
     private boolean isPublic;
 

src/main/java/com/alibaba/druid/wall/spi/WallVisitorUtils.java

@@ -64,6 +64,7 @@ import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlShowStatement;
 import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlUpdateStatement;
 import com.alibaba.druid.sql.dialect.mysql.parser.MySqlStatementParser;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleAlterIndexStatement;
+import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleExecuteImmediateStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleMultiInsertStatement;
 import com.alibaba.druid.sql.dialect.postgresql.ast.stmt.PGShowStatement;
 import com.alibaba.druid.sql.dialect.sqlserver.ast.stmt.SQLServerExecStatement;
@@ -2486,7 +2487,9 @@ public class WallVisitorUtils {
             allow = config.isMergeAllow();
             denyMessage = "merge not allow";
             errorCode = ErrorCode.MERGE_NOT_ALLOW;
-        } else if (x instanceof SQLCallStatement || x instanceof SQLServerExecStatement) {
+        } else if (x instanceof SQLCallStatement
+                || x instanceof SQLServerExecStatement
+                || x instanceof OracleExecuteImmediateStatement) {
             allow = config.isCallAllow();
             denyMessage = "call not allow";
             errorCode = ErrorCode.CALL_NOT_ALLOW;
@@ -2494,26 +2497,15 @@ public class WallVisitorUtils {
             allow = config.isTruncateAllow();
             denyMessage = "truncate not allow";
             errorCode = ErrorCode.TRUNCATE_NOT_ALLOW;
-        } else if (x instanceof SQLCreateTableStatement //
-                   || x instanceof SQLCreateIndexStatement //
-                   || x instanceof SQLCreateViewStatement //
-                   || x instanceof SQLCreateTriggerStatement //
-                   || x instanceof SQLCreateSequenceStatement //
-        ) {
+        } else if (x instanceof SQLCreateStatement) {
             allow = config.isCreateTableAllow();
             denyMessage = "create table not allow";
             errorCode = ErrorCode.CREATE_TABLE_NOT_ALLOW;
-        } else if (x instanceof SQLAlterTableStatement || x instanceof OracleAlterIndexStatement) {
+        } else if (x instanceof SQLAlterStatement) {
             allow = config.isAlterTableAllow();
             denyMessage = "alter table not allow";
             errorCode = ErrorCode.ALTER_TABLE_NOT_ALLOW;
-        } else if (x instanceof SQLDropTableStatement //
-                   || x instanceof SQLDropIndexStatement //
-                   || x instanceof SQLDropViewStatement //
-                   || x instanceof SQLDropTriggerStatement //
-                   || x instanceof SQLDropSequenceStatement //
-                   || x instanceof SQLDropProcedureStatement //
-        ) {
+        } else if (x instanceof SQLDropStatement) {
             allow = config.isDropTableAllow();
             denyMessage = "drop table not allow";
             errorCode = ErrorCode.DROP_TABLE_NOT_ALLOW;