improve Oracle SQL Parser, support drop sequence

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

@@ -0,0 +1,43 @@
+/*
+ * Copyright 1999-2011 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+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 OracleDropSequenceStatement extends OracleStatementImpl implements OracleDDLStatement {
+
+    private static final long serialVersionUID = 1L;
+
+    private SQLName           name;
+
+    @Override
+    public void accept0(OracleASTVisitor visitor) {
+        if (visitor.visit(this)) {
+            acceptChild(visitor, name);
+        }
+        visitor.endVisit(this);
+    }
+
+    public SQLName getName() {
+        return name;
+    }
+
+    public void setName(SQLName name) {
+        this.name = name;
+    }
+
+}

src/main/java/com/alibaba/druid/sql/dialect/oracle/parser/OracleStatementParser.java

@@ -72,6 +72,7 @@ import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleCreateProcedureStatem
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleCreateSequenceStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleDeleteStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleDropDatabaseLinkStatement;
+import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleDropSequenceStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleExceptionStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleExitStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleExplainStatement;
@@ -444,6 +445,18 @@ public class OracleStatementParser extends SQLStatementParser {
                         continue;
                     }
                 }
+                
+                if (identifierEquals("SEQUENCE")) {
+                    lexer.nextToken();
+                    
+                    SQLName name = this.exprParser.name();
+                    
+                    OracleDropSequenceStatement stmt = new OracleDropSequenceStatement();
+                    stmt.setName(name);
+                    
+                    statementList.add(stmt);
+                    continue;
+                }
 
                 throw new ParserException("TODO : " + lexer.token() + " " + lexer.stringVal());
             }

src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleASTVisitor.java

@@ -80,6 +80,7 @@ import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleCreateSequenceStateme
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleCreateTableStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleDeleteStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleDropDatabaseLinkStatement;
+import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleDropSequenceStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleExceptionStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleExitStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleExplainStatement;
@@ -626,5 +627,8 @@ public interface OracleASTVisitor extends SQLASTVisitor {
     boolean visit(OracleDataTypeIntervalDay x);
 
     void endVisit(OracleDataTypeIntervalDay x);
-    
+
+    boolean visit(OracleDropSequenceStatement x);
+
+    void endVisit(OracleDropSequenceStatement x);
 }

src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleASTVisitorAdapter.java

@@ -88,6 +88,7 @@ import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleCreateSequenceStateme
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleCreateTableStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleDeleteStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleDropDatabaseLinkStatement;
+import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleDropSequenceStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleExceptionStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleExitStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleExplainStatement;
@@ -1426,4 +1427,14 @@ public class OracleASTVisitorAdapter extends SQLASTVisitorAdapter implements Ora
         
     }
 
+    @Override
+    public boolean visit(OracleDropSequenceStatement x) {
+        return true;
+    }
+
+    @Override
+    public void endVisit(OracleDropSequenceStatement x) {
+        
+    }
+
 }

src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleOutputVisitor.java

@@ -117,6 +117,7 @@ import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleCreateSequenceStateme
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleCreateTableStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleDeleteStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleDropDatabaseLinkStatement;
+import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleDropSequenceStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleExceptionStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleExitStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleExplainStatement;
@@ -3175,7 +3176,18 @@ public class OracleOutputVisitor extends SQLASTOutputVisitor implements OracleAS
 
     @Override
     public void endVisit(OracleDataTypeIntervalDay x) {
-        // TODO Auto-generated method stub
+        
+    }
+    
+    @Override
+    public boolean visit(OracleDropSequenceStatement x) {
+        print("DROP SEQUENCE ");
+        x.getName().accept(this);
+        return false;
+    }
+
+    @Override
+    public void endVisit(OracleDropSequenceStatement x) {
         
     }
 }

src/main/java/com/alibaba/druid/sql/dialect/oracle/visitor/OracleSchemaStatVisitor.java

@@ -109,6 +109,7 @@ import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleCreateSequenceStateme
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleCreateTableStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleDeleteStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleDropDatabaseLinkStatement;
+import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleDropSequenceStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleExceptionStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleExitStatement;
 import com.alibaba.druid.sql.dialect.oracle.ast.stmt.OracleExplainStatement;
@@ -1855,4 +1856,14 @@ public class OracleSchemaStatVisitor extends SchemaStatVisitor implements Oracle
     public void endVisit(OracleDataTypeIntervalDay x) {
         
     }
+    
+    @Override
+    public boolean visit(OracleDropSequenceStatement x) {
+        return false;
+    }
+
+    @Override
+    public void endVisit(OracleDropSequenceStatement x) {
+        
+    }
 }

src/test/java/com/alibaba/druid/bvt/sql/oracle/OracleDropSequenceTest.java

@@ -0,0 +1,58 @@
+/*
+ * Copyright 1999-2011 Alibaba Group Holding Ltd.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.alibaba.druid.bvt.sql.oracle;
+
+import java.util.List;
+
+import junit.framework.Assert;
+
+import com.alibaba.druid.sql.OracleTest;
+import com.alibaba.druid.sql.SQLUtils;
+import com.alibaba.druid.sql.ast.SQLStatement;
+import com.alibaba.druid.sql.dialect.oracle.parser.OracleStatementParser;
+import com.alibaba.druid.sql.dialect.oracle.visitor.OracleSchemaStatVisitor;
+import com.alibaba.druid.stat.TableStat;
+import com.alibaba.druid.util.JdbcConstants;
+
+public class OracleDropSequenceTest extends OracleTest {
+
+    public void test_types() throws Exception {
+        String sql = //
+        "DROP SEQUENCE oe.customers_seq";
+
+        OracleStatementParser parser = new OracleStatementParser(sql);
+        List<SQLStatement> statementList = parser.parseStatementList();
+        SQLStatement statement = statementList.get(0);
+        print(statementList);
+
+        Assert.assertEquals(1, statementList.size());
+
+        Assert.assertEquals("DROP SEQUENCE oe.customers_seq", SQLUtils.toSQLString(statement, JdbcConstants.ORACLE));
+
+        OracleSchemaStatVisitor visitor = new OracleSchemaStatVisitor();
+        statement.accept(visitor);
+
+        System.out.println("Tables : " + visitor.getTables());
+        System.out.println("fields : " + visitor.getColumns());
+        System.out.println("coditions : " + visitor.getConditions());
+        System.out.println("relationships : " + visitor.getRelationships());
+        System.out.println("orderBy : " + visitor.getOrderByColumns());
+
+        Assert.assertEquals(0, visitor.getTables().size());
+
+        Assert.assertEquals(0, visitor.getColumns().size());
+    }
+}